Comparison of methane concentration and stable carbon isotope data for natural samples analyzed by discrete sample introduction module - cavity ring down spectroscopy (DSIM-CRDS) and traditional methods

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: John W. Pohlman
Originator: Michael Casso
Publication_Date: 20210827
Title:

Comparison of methane concentration and stable carbon isotope data for natural samples analyzed by discrete sample introduction module - cavity ring down spectroscopy (DSIM-CRDS) and traditional methods

Edition: 1
Geospatial_Data_Presentation_Form: tabular digital data
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P99B34V1

Publication_Information:

Publication_Place: Reston, VA
Publisher: U.S. Geological Survey

Other_Citation_Details:

Suggested Citation: Pohlman, J.W., and Casso, M., 2021, Comparison of methane concentration and stable carbon isotope data for natural samples analyzed by discrete sample introduction module - cavity ring down spectroscopy (DSIM-CRDS) and traditional methods: U.S. Geological Survey data release, https://doi.org/10.5066/P99B34V1.
This data release is in support of: Pohlman, J.W., Casso, M., Magen, C., and Bergeron, E., 2021, Discrete sample introduction module (DSIM) for quantitative and isotopic analysis of methane and other gases by cavity ring-down spectroscopy: Environmental Science and Technology, https://doi.org/10.1021/acs.est.1c01386.

Online_Linkage: https://doi.org/10.5066/P99B34V1
Online_Linkage:

https://www.sciencebase.gov/catalog/item/60d60d72d34e960393674818

Description:

Abstract:

A discrete sample introduction module (DSIM) was developed and interfaced to a cavity ring-down spectrometer to enable measurements of methane and CO2 concentrations and 13C values with a commercially available cavity ring-down spectrometer (CRDS). The DSIM-CRDS system permits the analysis of limited volume (5 - 100-ml) samples ranging six orders-of-magnitude from 100% analyte to the lower limit of instrument detection (2 ppm). We demonstrate system performance for methane by comparing concentrations and 13C results obtained by the DSIM and traditional methods for a variety of sample types, including low concentration (nanomolar) seawater and high concentration (> 90%) natural gas. The expansive concentration range the CRDS is able to analyze while being packaged in a field-portable analytical system greatly enhances functionality for investigating methane and CO2 dynamics, as well as other gases measured by laser absorption spectroscopy.

Purpose:

The data were collected to demonstrate the results obtained with the DSIM-CRDS system are comparable to those from traditional analytical methods. The samples were collected from sediment and water column samples along the United States Atlantic Margin, sediments from the northern Cascadia margin and the Indian Ocean. In addition to validating the method developed, the data also provide fundamental measurements from these sites.

Supplemental_Information:

Additional information regarding the field activities associated with these data can be obtained from https://cmgds.marine.usgs.gov/fan_info.php?fan=2015-005-FA.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2021

Currentness_Reference: publication date

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -126.6787
East_Bounding_Coordinate: 84.2079
North_Bounding_Coordinate: 48.7896
South_Bounding_Coordinate: 15.4462

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: environment
Theme_Keyword: oceans

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: methane
Theme_Keyword: methane hydrate
Theme_Keyword: stable isotopes
Theme_Keyword: biogeochemistry
Theme_Keyword: oceanography
Theme_Keyword: carbon dioxide
Theme_Keyword: geochemistry
Theme_Keyword: geochemical data
Theme_Keyword: cavity ring-down spectroscopy

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: gas hydrate resources
Theme_Keyword: marine chemistry
Theme_Keyword: ocean characteristics
Theme_Keyword: geochemistry
Theme_Keyword: carbon isotope analysis
Theme_Keyword: carbon cycling

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: isotope geochemistry
Theme_Keyword: sediment geochemistry
Theme_Keyword: carbon cycle

Theme:

Theme_Keyword_Thesaurus: Coastal and Marine Ecological Classification Standard
Theme_Keyword: Temperate Northern Atlantic
Theme_Keyword: Temperate Northern Pacific

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:60d60d72d34e960393674818

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: northern U.S. Atlantic margin
Place_Keyword: northern Cascadia margin
Place_Keyword: eastern continental margin of India

Access_Constraints: None. Please see 'Distribution Info' for details.
Use_Constraints:

None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: John W. Pohlman
Contact_Organization: Woods Hole Coastal and Marine Science Center

Contact_Position: Research Geochemist
Contact_Address:

Address_Type: mailing and physical
Address: 384 Woods Hole Rd
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Country: USA

Contact_Voice_Telephone: 508-548-8700 x2213
Contact_Electronic_Mail_Address: jpohlman@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name:

https://www.sciencebase.gov/catalog/file/get/60d60d72d34e960393674818?name=DSIM-CRDS_system.png

Browse_Graphic_File_Description:

Image of Michael Casso operating the DSIM-CRDS system on a ship during field work.

Browse_Graphic_File_Type: PNG

Browse_Graphic:

Browse_Graphic_File_Name:

https://www.sciencebase.gov/catalog/file/get/60d60d72d34e960393674818?name=DSIM-CRDS_data_plot.png

Browse_Graphic_File_Description:

Plot of DSIM-CRDS data suite from analysis of oceanographic profile

Browse_Graphic_File_Type: PNG

Data_Set_Credit:

Development of the DSIM was supported by the U.S. Geological Survey’s Gas Hydrates Project. Samples from the U.S. Atlantic margin were collected with support from USGS-DOE Interagency Agreements DE-FE0005806 and DE-FE0023495.We appreciate suggestions and technical support provided by Lee-Gray Boze and Sean Sylva.

Native_Data_Set_Environment: Microsoft Excel for Microsoft 365 MSO 32-bit, Windows 10
Cross_Reference:

Citation_Information:

Originator: Pohlman, John W.
Originator: Casso, Michael
Originator: Magen, Cédric
Originator: Bergeron, Emile
Publication_Date: 2021
Title:

Discrete sample introduction module (DSIM) for quantitative and isotopic analysis of methane and other gases by cavity ring-down spectroscopy

Geospatial_Data_Presentation_Form: publication
Series_Information:

Series_Name: Environmental Science and Technology
Issue_Identification: unknown

Publication_Information:

Publication_Place: Washington D.C.
Publisher: ACS

Other_Citation_Details: The journal article these data support.
Online_Linkage: https://doi.org/10.1021/acs.est.1c01386

Cross_Reference:

Citation_Information:

Originator: Pohlman, John W.
Originator: Kaneko, Masanori
Originator: Heuer, Verena B.
Originator: Coffin, Richard B.
Originator: Whiticar, Michael
Publication_Date: 20090926
Title:

Methane sources and production in the northern Cascadia margin gas hydrate system

Geospatial_Data_Presentation_Form: publication
Series_Information:

Series_Name: Earth Planetary Science Letters
Issue_Identification: Volume 287, Issues 3-4

Publication_Information:

Publication_Place: Amsterdam
Publisher: Elsevier

Other_Citation_Details:

The citation is included because the original northern Cascadia margin IRMS data are part of this publication

Online_Linkage: https://doi:10.1016/j.epsl.2009.08.037

Cross_Reference:

Citation_Information:

Originator: Timothy S. Collett
Originator: Ray Boswell
Originator: William F. Waite
Originator: Pushpendra Kumar
Originator: Sandip Kumar Roy
Originator: Krishan Chopra
Originator: Sunil Kumar Singh
Originator: Yasuhiro Yamada
Originator: Norio Tenma
Originator: John Pohlman
Originator: Margarita Zyrianova
Originator: NGHP Expedition 02 Scientific Party
Publication_Date: 20191001
Title:

India National Gas Hydrate Program Expedition 02 Summary of Scientific Results: Gas hydrate systems along the eastern continental margin of India

Geospatial_Data_Presentation_Form: publication
Series_Information:

Series_Name: Marine and Petroleum Geology
Issue_Identification: Vol 108

Publication_Information:

Publication_Place: Elsevier
Publisher: Amsterdam

Other_Citation_Details:

The citation is included because the original Indian Ocean IRMS data are part of this publication

Online_Linkage: https://doi.org/10.1016/j.marpetgeo.2019.05.023

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The accuracy of each attribute is determined by that analysis specific to that attribute.

Logical_Consistency_Report:

All data provided in this release were obtained by Michael Casso under the supervision of USGS Research Geochemist John Pohlman. The data match all details for the data provided in the cross-referenced manuscript (Pohlman et al., 2021). Each sample represents a unique identifier and the data fit within expected ranges for the environments sampled.

Completeness_Report:

With the exception of a limited number (2) of standard deviations for methane concentration measurements by the CRDS, the data presented is complete. The missing values were not recorded during data aquisition.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The horizonal positions (coordinates) were obtained from shipboard navigation systems from the following vessels: D/V CHIKYU for the Indian Ocean data; D/V Joides Resolution for the northern Cascadia margin data; and R/V Hugh R. Sharp for the U.S. Atlantic margin data. The horizonal positional accuracy for research vessels of that caliber are considered to be accurate to less than 1 m.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Vertical data from the water column are accurate to 0.1 m as limited by the sensitivity of the pressure sensor in the CTD. Vertical data from the sediments (meters below the sea floor) are accurate to <0.01 m for all samples.

Lineage:

Process_Step:

Process_Description:

To evaluate the performance of the USGS-DSIM system for analysis of natural samples, dissolved methane concentration data are compared to those from gas chromatography-flame ionization detection (GC-FID), and d13C values are compared to those from isotope ratio mass spectrometry (IRMS). Comparisons of methane water column concentrations are from an oceanographic profile in an area of sea floor methane seepage on the US Atlantic Margin. Comparisons of d13C-CH4 are from the U.S. Atlantic margin water column, U.S. Atlantic margin sediment pore waters, sediment void gas from the northern Cascadia Margin and gas hydrate-bearing sediment pressure cores from the Indian Ocean. The comparisons encompass the variety, concentration range, and isotopic values aquatic scientists and gas geochemists collect and analyze.
The concentration of the gas sample in the syringe to be analyzed, as estimated by the user, determines the manner by which the sample is processed by the DSIM-CRDS system. Low concentration samples (< 1000 ppmv) are analyzed in the "System Load" DSIM configuration to minimize dilution of the sample (>97% recovery), while higher concentration samples are quantitatively diluted using configurations that dilute the sample by factors of ~85 (Loop B Load/Analysis), ~215 (Loop A Load/Analysis) or ~1400 (Loop A Load/Analysis with Expansion. This approach enables to a user to analyze limited volume (5 - 100-ml) samples ranging six orders-of-magnitude from 100% analyte to the lower limit of instrument detection (2 ppmv) with a relative standard deviation of less than 1% for every configuration for concentration while also obtaining stable carbon isotopic data comparable to IRMS values when the sample concentration exceeds 10 ppmv for methane and 200 ppm for CO2. How the methane and CO2 concentration and stable carbon isotopic data are converted from instrument measurements to values calibrated against internationally recognized standards as fully described in Pohlman and others (2021). See citation below. Briefly, all measurements are corrected as slope and offset corrections obtained from linear regression analysis of the known standard concentrations and instrument measured values.

Process_Date: 2021
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: John Pohlman
Contact_Organization: USGS Woods Hole Coastal and Marine Science Center

Contact_Position: Research Geochemist
Contact_Address:

Address_Type: mailing and physical
Address: USGS, 384 Woods Hole Rd
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Country: USA

Contact_Voice_Telephone: 508-457-8700 (x2310)
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: jpohlman@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: point

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.00001
Longitude_Resolution: 0.00001
Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: World Geodetic System 1984
Ellipsoid_Name: WGS 84
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257223563

Vertical_Coordinate_System_Definition:

Depth_System_Definition:

Depth_Datum_Name: local surface
Depth_Resolution: 0.1
Depth_Distance_Units: meters
Depth_Encoding_Method: attribute values

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: DSIM_Environmental_Data_DSIM-IRMS_Comparison
Entity_Type_Definition:

Comma Separated Value (.csv) and Excel Workboon (.xlsx) files containing data. Contains 51 data records. The first row is descriptive and not related to column headings.

Entity_Type_Definition_Source: Producer Defined

Attribute:

Attribute_Label: Expedition
Attribute_Definition:

Official names of the scientific expedition(s) during which the samples were collected

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: HRS15-12
Enumerated_Domain_Value_Definition:

The 12th expedition aboard the R/V Hugh R. Sharp in 2015, an investigation of Atlantic Margin methane hydrate dynamics. 09/06/2015 to 09/17/2015. FA-2015-005.

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: IODP Expedition 311
Enumerated_Domain_Value_Definition:

Integrated Ocean Drilling Program Expedition 311, an investigation of methane hydrate distribution along a margin perpendicular transect of the northern Cascadia margin. 08/28/2005 to 10/28/2005

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: NGHP-02
Enumerated_Domain_Value_Definition:

National Gas Hydrate Program Expedition 02, an assessment of gas hydrate along the eastern coast of India. 03/03/2015 to 07/28/2015

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute:

Attribute_Label: Geographic_Location
Attribute_Definition: General oceanic location where each expedition was conducted
Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: U.S. Atlantic Margin
Enumerated_Domain_Value_Definition:

Continental shelf and slope of the U.S. Atlantic margin from offshore Virginia to Long Island New York, United States

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Northern Cascadia Margin
Enumerated_Domain_Value_Definition:

Continental margin offshore of Vancouver Island, British Columbia Canada

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Indian Ocean
Enumerated_Domain_Value_Definition:

Western continental margin of the Indian Ocean at the Krishna-Godavari and Mahanadi basins

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute:

Attribute_Label: latitude(dd)
Attribute_Definition:

Latitudinal position in decimal degrees measured by the navigation system of the supporting research vessel where the samples were collected

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 15.4462
Range_Domain_Maximum: 48.7896
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: .0001

Attribute:

Attribute_Label: longitude(dd)
Attribute_Definition:

Longitudinal position in decimal degrees measured by the navigation system of the supporting research vessel where the samples were collected. Negative values indicate the western hemisphere.

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -126.6787
Range_Domain_Maximum: 84.2079
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: .0001

Attribute:

Attribute_Label: Site
Attribute_Definition:

Expedition site name referring to a specific area within the Geographic_Location.

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Hudson Canyon
Enumerated_Domain_Value_Definition:

Shelf incising submarine canyon on the US Atlantic margin offshore of New York U.S.

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Baltimore Canyon
Enumerated_Domain_Value_Definition:

Shelf incising submarine canyon on the US Atlantic margin offshore of Maryland U.S.

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Chincoteague Slope
Enumerated_Domain_Value_Definition:

A portion of the U.S. Atlantic margin continental slope offshore of Virginia U.S.

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: U1329C
Enumerated_Domain_Value_Definition:

IODP drilling location near the shelf/slope break on the northern Cascadia margin offshore of Vancouver Island, British Columbia Canada

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Site X, Area Y
Enumerated_Domain_Value_Definition:

Scientific drilling locations where “X” is the site number specified during the Indian National Gas Hydrate Program Expedition 2 (NGHP-02) and “Y” is the alphanumeric specific permit area within the site

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute:

Attribute_Label: Deployment_ID
Attribute_Definition:

Sample collection Deployment_ID for the designated scientific expedition

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Alphanumeric codes for describing the samples collected for a deployment at a specific location. The alphabetic portion describes the Sample_Type (further described by the "Type" attribute), and the numeric portion the order the sample was collected

Attribute:

Attribute_Label: Type
Attribute_Definition: Description of the type and means of sample collection
Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Piston Core
Enumerated_Domain_Value_Definition:

A device that collects a continuous sediment core extending from the sediment water interface to meters below the sea floor

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Multicore
Enumerated_Domain_Value_Definition:

A device that collects multiple short sediment cores extending from the sediment water interface to less than 1 m below the sea floor

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: CTD
Enumerated_Domain_Value_Definition:

Conductivity-Temperature-Depth profiler that was integrated with number of Niskin-type water sampling bottles used to collect water samples from discrete depths in the ocean

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: APC
Enumerated_Domain_Value_Definition:

Advanced piston core (APC) used to collect ~ 10 m sediment core sections in the upper portion of a scientific drilling hole where the sediments are unconsolidated

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: RCB
Enumerated_Domain_Value_Definition:

Rotary core barrel (RBC) used to collected ~10 ml sediment core sections in the lower portion of a scientific drilling hole where sediments are too consolidate for the APC

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: PCS
Enumerated_Domain_Value_Definition:

Pressure core system (PCS) used to collect up to 3 m long sediment sections and maintain the in-situ reservoir pressure during recovery. Used frequently during gas hydrate studies to recover and maintain cores with gas hydrate intact for detailed physical and chemical property studies

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute:

Attribute_Label: Collection_Date
Attribute_Definition: Calendar date (MM/DD/YEAR) the sample was collected
Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 9/26/2005
Range_Domain_Maximum: 9/18/2015
Attribute_Units_of_Measure: calendar date (MM/DD/YEAR)
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: Sample_ID
Attribute_Definition: Expedition specific sample identification code
Attribute_Definition_Source: Expedition Curator Defined
Attribute_Domain_Values:

Unrepresentable_Domain:

A combination of alphanumeric characters used to uniquely identify samples collected during each expedition. The specific format varies but is consistent within each expedition report

Attribute:

Attribute_Label: Sample_Type
Attribute_Definition: Description of the type of sample processed
Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Sediment pore water
Enumerated_Domain_Value_Definition:

Sediment from the core collected with a 5 ml cut-off syringe, placed in a 30 ml serum vial and capped with a stopper. After the addition of 5 ml brine and a 2 min agitation period, 5 ml gas was removed from the vial and analyzed

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Water column
Enumerated_Domain_Value_Definition:

900 ml samples collected in 1L syringes. 100 ml headspace added to the syringe and after a 2 min agitation period the gas was removed and analyzed

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Sediment void gas
Enumerated_Domain_Value_Definition:

Gas from expansion cracks in a sediment core extracted from a hole pierced in the core liner in a syringe and transferred to an evacuated 30 ml stoppered serum. The analyzed sample was removed from the vial

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Sediment pressure core sampler gas
Enumerated_Domain_Value_Definition:

Gas samples released from the pressure core were collected in a syringe and transferred to a 30 ml evacuated serum vial. The analyzed sample was removed from the vial

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute:

Attribute_Label: Sample_Depth(m)
Attribute_Definition:

Depth below sea surface for water samples for sample type Water Samples or depth below sea floor for sediment samples of types Sediment pore water, Sediment void gas and, Sediment pressure core sampler gas

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.32
Range_Domain_Maximum: 1033
Attribute_Units_of_Measure: meter
Attribute_Measurement_Resolution: .01

Attribute:

Attribute_Label: Analysis_Date
Attribute_Definition: Calendar date the sample was analyzed
Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 9/9/2015
Range_Domain_Maximum: 3/15/2019
Attribute_Units_of_Measure: Date DD/MM/YEAR

Attribute:

Attribute_Label: DSIM_Method
Attribute_Definition: DSIM configurations used to process the sample
Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Loop B Load/Analysis
Enumerated_Domain_Value_Definition:

The sample was introduced into DSIM through Loop B and subsequently diluted and analyzed in the Loop B analysis configuration

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Loop B Load/Analysis
Enumerated_Domain_Value_Definition:

The sample was diluted by a factor of 10 in a syringe and then introduced into DSIM through Loop B and subsequently diluted and analyzed in the Loop B analysis configuration

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: System Load/Analysis
Enumerated_Domain_Value_Definition:

The sample was diluted by a factor of 10 in a syringe and then introduced into DSIM through Loop B and subsequently diluted and analyzed in the Loop B analysis configuration

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: System Load/Analysis
Enumerated_Domain_Value_Definition:

A 100 ml sample was loaded into the DSIM analytical loop and then analyzed without dilution in the System Analysis configuration

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Loop A Exp Load/Analysis
Enumerated_Domain_Value_Definition:

The sample was introduced into DSIM through Loop A and subsequently diluted and analyzed in the Loop A analysis with expansion volume enable configuration

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Loop B Load/Analysis
Enumerated_Domain_Value_Definition:

The sample was diluted by a factor of 10 in a syringe and then introduced into DSIM through Loop B and subsequently diluted and analyzed in the Loop B analysis configuration

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute:

Attribute_Label: Meas_CRDS_CH4(ppm)
Attribute_Definition:

Concentration of methane measured by the analyzer in parts per million by volume without calibration or dilution factors applied

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 13.84
Range_Domain_Maximum: 1981
Attribute_Units_of_Measure: parts per million
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: Meas_CRDS_CH4(SD)
Attribute_Definition:

1-sigma standard deviation of the measurement determined by averaging a 1-minute data interval

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: n/a
Enumerated_Domain_Value_Definition: Data not recorded
Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 53.72
Attribute_Units_of_Measure: parts per million
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: Corr_CRDS_CH4(ppm)
Attribute_Definition:

Methane concentration calibrated and corrected for dilution within DSIM. This concentration represents the in situ concentration of the sample

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 14.1
Range_Domain_Maximum: 875304.64
Attribute_Units_of_Measure: parts per million
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: Corr_CRDS_CH4(stdev)
Attribute_Definition:

1-sigma standard deviation of the calibrated and dilution corrected value

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.02
Range_Domain_Maximum: 4537.93
Attribute_Units_of_Measure: nanomoles per liter (nM)
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: CRDS_d13CH4(‰)
Attribute_Definition:

CRDS generated isotopic ration value (iCH4) expressed as a delta value (‰) relative the Vienna Pee Dee Belemnite standard

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -90.29
Range_Domain_Maximum: -39.82
Attribute_Units_of_Measure: per mille
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: CRDS_d13CH4(stdev)
Attribute_Definition:

1-sigma standard deviation of the standardized delta value (‰) determined from a one minute measurement interval

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.23
Range_Domain_Maximum: 3.79
Attribute_Units_of_Measure: per mille
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: IRMS_d13CH4(‰)
Attribute_Definition:

Isotope ratio mass spectrometry (IRMS) measurement expressed as a delta value (‰) relative the Vienna Pee Dee Belemnite standard

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -89.44
Range_Domain_Maximum: -41
Attribute_Units_of_Measure: per mille
Attribute_Measurement_Resolution: 0.02

Attribute:

Attribute_Label: IRMS_Data_Source
Attribute_Definition:

Location where IRMS value was measured or reported in the literature

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: WHOI IRMS Facility
Enumerated_Domain_Value_Definition:

Measured at the Woods Hole Oceanographic Institution stable isotope lab

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Pohlman and others (2009)
Enumerated_Domain_Value_Definition:

Values previously published in Pohlman and others (2009), Methane sources and production in the northern Cascadia margin gas hydrate system, Earth and Planetary Science Letters. doi:10.1016/j.epsl.2009.08.037

Enumerated_Domain_Value_Definition_Source: Producer defined

Detailed_Description:

Entity_Type:

Entity_Type_Label: DSIM _Environmental_Data_DSIM-GC_Comparison
Entity_Type_Definition:

Comma Separated Value (.csv) and Excel Workboon (.xlsx) files containing data. Contains 10 data records. The first row is descriptive and not related to column headings.

Entity_Type_Definition_Source: Producer Defined

Attribute:

Attribute_Label: Expedition
Attribute_Definition:

Official names of the scientific expedition during which the samples were collected

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: HRS15-12
Enumerated_Domain_Value_Definition:

The 12th expedition aboard the R/V Hugh R. Sharp in 2015, an investigation of Atlantic Margin methane hydrate dynamics. 09/06/2015 to 09/17/2015. FA-2015-005.

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute:

Attribute_Label: Geographic_Location
Attribute_Definition: General oceanic location where each expedition was conducted
Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: US Atlantic Margin
Enumerated_Domain_Value_Definition:

Continental shelf and slope of the U.S. Atlantic margin from offshore Virginia to Long Island New York, United States

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute:

Attribute_Label: latitude(dd)
Attribute_Definition:

Latitudinal position in decimal degrees measured by the navigation system of the supporting research vessel where the samples were collected

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 15.4462
Range_Domain_Maximum: 48.7896
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: .0001

Attribute:

Attribute_Label: longitude(dd)
Attribute_Definition:

Longitudinal position in decimal degrees measured by the navigation system of the supporting research vessel where the samples were collected. Negative values indicate the western hemisphere.

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -74.2960
Range_Domain_Maximum: -74.2960
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: .0001

Attribute:

Attribute_Label: Site
Attribute_Definition:

Expedition site name referring to a specific area within the Geographic_Location

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Hudson Canyon
Enumerated_Domain_Value_Definition:

Shelf incising submarine canyon on the U.S. Atlantic margin offshore of New York US

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Baltimore Canyon
Enumerated_Domain_Value_Definition:

Shelf incising submarine canyon on the U.S. Atlantic margin offshore of Maryland U.S.

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Chincoteague Slope
Enumerated_Domain_Value_Definition:

A portion of the U.S. Atlantic margin continental slope offshore of Virginia U.S.

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: U1329C
Enumerated_Domain_Value_Definition:

IODP drilling location near the shelf/slope break on the northern Cascadia margin offshore of Vancouver Island, British Columbia Canada

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Site X, Area Y
Enumerated_Domain_Value_Definition:

Scientific drilling locations where “X” is the site number specified during the Indian National Gas Hydrate Program Expedition 2 (NGHP-02). And “Y” is the alphanumeric specific permit area within the site. within specific permit areas

Enumerated_Domain_Value_Definition_Source: Producer defined

Attribute:

Attribute_Label: Deployment_ID
Attribute_Definition:

Sample collection Deployment_ID for the designated scientific expedition

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Alphanumeric code for a conductivity-depth-temperature (CTD) deployment at a specific location.

Attribute:

Attribute_Label: CTD_ID
Attribute_Definition: Identifier for the CTD sample collected during the deployment
Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Unrepresentable_Domain:

CTD: Conductivity-Temperature-Depth profiler equipped with number of Niskin-type water sampling bottles used to collect water samples from discrete depths in the ocean. The numeric indicator is the sample bottle number

Attribute:

Attribute_Label: Sample_ID
Attribute_Definition: Expedition specific sample identification code
Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Unrepresentable_Domain:

A combination of alphanumeric characters used to uniquely identify samples collected during each expedition. The specific format varies but is consistent within each expedition report

Attribute:

Attribute_Label: BottomDepth(m)
Attribute_Definition:

Total water depth(s) where samples were was collected as measured by ship sonar

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 370
Range_Domain_Maximum: 370
Attribute_Units_of_Measure: meters (m)
Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: SampleDepth(m)
Attribute_Definition:

Water depth from which samples were collected as measured by the CTD pressure sensor

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1.24
Range_Domain_Maximum: 373.00
Attribute_Units_of_Measure: meters (m)
Attribute_Measurement_Resolution: 0.02

Attribute:

Attribute_Label: DateCollected(MM/DD/YYYY)
Attribute_Definition:

Calendar date (MM/DD/YEAR) the sample was collected and analyzed

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 9/12/15
Range_Domain_Maximum: 9/12/15

Attribute:

Attribute_Label: Corr_GC-CH4(nM)
Attribute_Definition:

Concentration of sample (in nanomoles L-1) as measured with a gas chromatograph equipped with a flame ionization detector (GC-FID)

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 3.09
Range_Domain_Maximum: 74.67
Attribute_Units_of_Measure: nanomoles per liter (nM)
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: Corr_CRDS-CH4(nM)
Attribute_Definition:

Methane concentration calibrated and corrected for dilution within DSIM. This concentration represents the in situ concentration of the sample

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 2.68
Range_Domain_Maximum: 79.12
Attribute_Units_of_Measure: nanomoles per liter (nM)
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: Corr_CRDS-CH4(SD)
Attribute_Definition:

1-sigma standard deviation of the calibrated and dilution corrected value

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 0.26
Attribute_Units_of_Measure: nanomoles per liter (nM)
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: CRDS-d13C_CH4(‰)
Attribute_Definition:

CRDS measured isotope ratio value (iCH4) expressed as a delta value (‰) relative the Vienna Pee Dee Belemnite standard

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -87.18
Range_Domain_Maximum: -44.84
Attribute_Units_of_Measure: per mille
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: CRDS-d13C_CH4(SD)
Attribute_Definition:

1-sigma standard deviation of the standardized delta value (‰) determined from a one-minute measurement interval

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.84
Range_Domain_Maximum: 12.85
Attribute_Units_of_Measure: per mille
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: CRDS-CO2(ppm)
Attribute_Definition:

Methane concentration calibrated and corrected for dilution within DSIM. This concentration represents the headspace gas equilibrium concentration in the extraction syringe

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 395.8
Range_Domain_Maximum: 715.4
Attribute_Units_of_Measure: parts per million
Attribute_Measurement_Resolution: 0.1

Attribute:

Attribute_Label: CRDS-CO2(SD)
Attribute_Definition:

1-sigma standard deviation of the calibrated and dilution corrected value

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.5
Range_Domain_Maximum: 3.9

Attribute:

Attribute_Label: CRDS-d13C_CO2(‰)
Attribute_Definition:

CRDS measured isotope ratio value (iCO2) expressed as a delta value (‰) relative the Vienna Pee Dee Belemnite standard

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -12.05
Range_Domain_Maximum: -9.28
Attribute_Units_of_Measure: per mille
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: CRDS-iCO2(SD)
Attribute_Definition:

1-sigma standard deviation of the standardized delta value (‰) determined from a one-minute measurement interval

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.49
Range_Domain_Maximum: 1.47
Attribute_Units_of_Measure: per mille
Attribute_Measurement_Resolution: 0.01

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: GS ScienceBase
Contact_Organization: U.S. Geological Survey

Contact_Address:

Address_Type: mailing address
Address: Denver Federal Center, Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: United States

Contact_Voice_Telephone: 1-888-275-8747
Contact_Electronic_Mail_Address: sciencebase@usgs.gov

Resource_Description:

The dataset consists of two XLSX files and their comparable CSV formatted files. These files are DSIM_Environmental_Data_DSIM-IRMS_Comparison.xlsx, DSIM_Environmental_Data_DSIM-IRMS_Comparison.csv, DSIM_Environmental_Data_DSIM-GC_Comparison.xlsx, DSIM_Environmental_Data_DSIM-GC_Comparison.csv. The dataset also includes CSDGM metadata in XML format.

Distribution_Liability:

Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: XLSX
Format_Information_Content:

The dataset contains 2 data files - each in an XLSX and CSV format. Additionaly, CSDGM metadata describes the data files.

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalog/file/get/60d60d72d34e960393674818

Network_Resource_Name:

https://www.sciencebase.gov/catalog/item/60d60d72d34e960393674818

Network_Resource_Name: https://doi.org/10.5066/P99B34V1

Access_Instructions:

The first link downloads all the files on the landing page as a zip file, the second link is the link to the landing page where individual files can be downloaded, and the third link is the DOI link to the landing page of the datasets.

Digital_Form:

Digital_Transfer_Information:

Format_Name: CSV
Format_Information_Content:

The dataset contains 2 data files - each in an XLSX and CSV format. Additionaly, CSDGM metadata describes the data files.

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalog/file/get/60d60d72d34e960393674818

Network_Resource_Name:

https://www.sciencebase.gov/catalog/item/60d60d72d34e960393674818

Network_Resource_Name: https://doi.org/10.5066/P99B34V1

Access_Instructions:

Fees: None

Metadata_Reference_Information:

Metadata_Date: 20240319
Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: John Pohlman
Contact_Organization: Woods Hole Coastal and Marine Science Center

Contact_Position: Research Chemist
Contact_Address:

Address_Type: mailing address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Country: US

Contact_Voice_Telephone: 508-548-8700 x2213
Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov
Contact_Instructions:

The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240319)

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/SB_data_release/DR_P99B34V1/DSIM_EnvironmentalDataMethodComparision_2021_meta.html>