Metadata: Identification_Information: Citation: Citation_Information: Originator: Shawnee Traylor Originator: John W. Pohlman Originator: Michael Casso Originator: Lee-Gray Boze Originator: Sarah Youngs Originator: Mary Burkitt-Gray Publication_Date: 20250130 Title: Dissolved methane and CO2 concentrations and stable carbon isotopes from the coastal Arctic landscape of the Greiner Lake watershed, Nunavut, Canada in June 2022 and June-July 2023 Edition: 1.0 Geospatial_Data_Presentation_Form: tabular digital data Series_Information: Series_Name: data release Issue_Identification: doi:10.5066/P1UECHWK Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Suggested citation: Traylor, S., Pohlman, J.W., Casso, M., Boze, L-G., Youngs, S., and Burkitt-Gray, M., 2025, Dissolved methane and CO2 concentrations and stable carbon isotopes from a coastal Arctic landscape collected in the Greiner Lake watershed of Cambridge Bay, Nunavut, Canada in June 2022 and Jun-July 2023: U.S. Geological Survey data release, https://doi.org/10.5066/P1UECHWK . Online_Linkage: https://doi.org/10.5066/P1UECHWK Description: Abstract: A watershed in the coastal Canadian Arctic was sampled for dissolved carbon dioxide and methane concentration and stable carbon (carbon-13) isotopes to trace the transport, production, and consumption of carbon dioxide and methane during the spring thaw across a lake to bay transect. Two field campaigns were conducted in June 2022 and June-July 2023 out of the Canadian High Arctic Research Station (CHARS) in Cambridge Bay, Nunavut, Canada. Gas samples were collected via headspace extraction and transported back to the U.S. Geological Survey (USGS) Woods Hole Coastal and Marine Science Center (WHCMSC), where they were analyzed utilizing the USGS Automated Sample Introduction Module (AutoSIM) interfaced to a Picarro G2201-i CRDS (Cavity Ring-Down Spectrometer) to measure concentrations and stable carbon isotope ratios of methane and carbon dioxide. Field sampling was carried out by researchers from the Woods Hole Oceanographic Institution. Purpose: These data are used to investigate how carbon cycling evolves across a coastal Arctic landscape during the spring thaw. Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 20220617 Single_Date/Time: Calendar_Date: 20220618 Single_Date/Time: Calendar_Date: 20220619 Single_Date/Time: Calendar_Date: 20220621 Single_Date/Time: Calendar_Date: 20220624 Single_Date/Time: Calendar_Date: 20220625 Single_Date/Time: Calendar_Date: 20220626 Single_Date/Time: Calendar_Date: 20220627 Single_Date/Time: Calendar_Date: 20220629 Single_Date/Time: Calendar_Date: 20230620 Single_Date/Time: Calendar_Date: 20230623 Single_Date/Time: Calendar_Date: 20230625 Single_Date/Time: Calendar_Date: 20230626 Single_Date/Time: Calendar_Date: 20230627 Single_Date/Time: Calendar_Date: 20230628 Single_Date/Time: Calendar_Date: 20230629 Single_Date/Time: Calendar_Date: 20230630 Single_Date/Time: Calendar_Date: 20230701 Single_Date/Time: Calendar_Date: 20230702 Single_Date/Time: Calendar_Date: 20230703 Single_Date/Time: Calendar_Date: 20230704 Currentness_Reference: ground condition of individual sampling events Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -105.09601 East_Bounding_Coordinate: -104.80108 North_Bounding_Coordinate: 69.18619 South_Bounding_Coordinate: 69.10254 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: environment Theme_Keyword: inlandWaters Theme_Keyword: oceans Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: USGS Theme_Keyword: U.S. Geological Survey Theme_Keyword: carbon dioxide Theme_Keyword: methane Theme_Keyword: carbon isotopes Theme_Keyword: coastal environment Theme_Keyword: geochemical data Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: estuarine ecosystems Theme_Keyword: freshwater ecosystems Theme_Keyword: carbon cycling Theme_Keyword: carbon isotope analysis Theme_Keyword: biogeochemical cycling Theme_Keyword: coastal ecosystems Theme_Keyword: permafrost Theme_Keyword: geochemistry Theme_Keyword: dissolved gases Theme_Keyword: aquatic ecosystems Theme_Keyword: biogeochemical cycling Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:671be425d34efed56210dfb1 Place: Place_Keyword_Thesaurus: None Place_Keyword: Cambridge Bay Place_Keyword: Nunavut Place_Keyword: Greiner Lake Watershed Place_Keyword: Victoria Island Place_Keyword: Canada Access_Constraints: None. Use_Constraints: None. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: John Pohlman Contact_Organization: U.S. Geological Survey Contact_Position: Research Geochemist Contact_Address: Address_Type: mailing and physical Address: USGS, 384 Woods Hole Road. 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/671be425d34efed56210dfb1/?name=Cambridge_Bay_Sampling_Locations.png Browse_Graphic_File_Description: Browse graphic of the sampling locations in the Greiner Lake watershed from the 2022 (red circles) and 2023 (blue circles) campaigns, with sites that were visited both years in purple. Letters refer to the Station ID name. The frequency of sampling and data collected varied by location. These sites included the lake, river, bay, and six ponds at varying distance from Cambridge Bay. Satellite image from Earthstar Geographics. Browse_Graphic_File_Type: PNG Data_Set_Credit: U.S. Geological Survey, Woods Hole Oceanographic Institution Native_Data_Set_Environment: macOS Sonoma 14.5; Microsoft Excel for Mac 2024. Cross_Reference: Citation_Information: Originator: Cédric Magen Originator: Laura L. Lapham Originator: John W. Pohlman Originator: Kathleen Marshall Originator: Samantha Bosman Originator: Michael Casso Originator: Jeffrey P. Chanton Publication_Date: 20140908 Title: A simple headspace equilibration method for measuring dissolved methane Series_Information: Series_Name: Limnology and Oceanography: Methods Issue_Identification: vol. 12, issue 9 Publication_Information: Publication_Place: New Jersey Publisher: Wiley Other_Citation_Details: pp. 637-650. Publication describes the method for extracting and analyzing dissolved gas concentrations. Online_Linkage: https://doi.org/10.4319/lom.2014.12.637 Cross_Reference: Citation_Information: Originator: John W. Pohlman Originator: Michael Casso Originator: Cédric Magen Originator: Emile Bergeron Publication_Date: 20210825 Title: Discrete Sample Introduction Module for Quantitative and Isotopic Analysis of Methane and Other Gases by Cavity Ring-Down Spectroscopy Series_Information: Series_Name: Environmental Science and Technology Issue_Identification: vol. 55, issue 17 Publication_Information: Publication_Place: n/a Publisher: American Chemical Society (ACS) Other_Citation_Details: ppg. 12066-12074. Publication describes the method used to measure samples for this release. Online_Linkage: https://doi.org/10.1021/acs.est.1c01386 Cross_Reference: Citation_Information: Originator: Denis Wiesenberg Originator: N. Guinasso Publication_Date: 19790201 Title: Equilibrium solubilities of methane, carbon monoxide, and hydrogen in water and sea water Series_Information: Series_Name: Journal of Chemical and Engineering Data Issue_Identification: vol. 24, issue 4 Publication_Information: Publication_Place: n/a Publisher: American Chemical Society (ACS) Other_Citation_Details: pp. 356-360. Publication describes solubility of methane in water. Online_Linkage: https://doi.org/10.1021/je60083a006 Cross_Reference: Citation_Information: Originator: Sachio Yamamoto Originator: James Alcauskas Originator: Thomas Crozier Publication_Date: 19760121 Title: Solubility of methane in distilled water and seawater Series_Information: Series_Name: Journal of Chemical and Engineering Data Issue_Identification: vol. 21, issue 1 Publication_Information: Publication_Place: n/a Publisher: American Chemical Society (ACS) Other_Citation_Details: pp. 78-80. Publication describes solubility of methane in water. Online_Linkage: https://doi.org/10.1021/je60068a029 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The accuracy of each attribute is determined by that analysis specific to that attribute. The accuracy is provided in the process step for each measurement. Logical_Consistency_Report: All data provided in this release were obtained by Shawnee Traylor, Sarah Youngs, and Mary Burkitt-Gray, and processed by Shawnee Traylor, Michael Casso, and John Pohlman. Data were obtained during two field campaigns in consecutive years. Samples were generally taken in duplicate, but occasionally this did not occur or the samples were damaged or lost prior to processing. The obtained data were processed and handled the same way after each deployment. The “Comments” field in the dataset will document any deviation from this practice. This dataset only includes environmental samples that were collected for the purpose of studying the natural environment. Thus, it excludes discrete samples that were collected for the purpose of informing calibration or engineering questions. Completeness_Report: Certain samples were not included in this dataset because they were not natural water samples and were used for the calibration of other instrumentation. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The horizontal position (coordinates) of the sites were determined using the native GPS on an Apple iPhone SE, reported to have a precision of 5 meters. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The samples were all from the surface and the associated depth was estimated based on the length of the sampling syringe. Lineage: Process_Step: Process_Description: Discrete water samples were collected from the study area during two field campaigns. The first between June 17-29, 2022, and the second from June 20 to July 4th, 2023. Station replicates between seasons were collected from the same water body, with proximity determined by ice cover and other local conditions. Sampling protocol followed that outlined in Pohlman and others, 2021. Samples were collected by filling 1-Liter (L) plastic syringes fitted with 3-way stopcocks with 880 milli-Liters (mL) of natural water and 120 mL of Zero Air. A headspace extraction was performed by shaking the syringes for two minutes and collecting the headspace into 250 cc multi-layer foil bags (Cali-5 Bond). These samples were transported back to the lab, stored at room temperature, and processed for measurements within two months of collection. Additional measurements were made with the CTD (RBR Concerto conductivity, temperature, and depth probe.) Process_Date: 2022 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: John Pohlman Contact_Organization: U.S. Geological Survey, Northeast Region Contact_Position: research geochemist Contact_Address: Address_Type: physical and mailing address Address: USGS, 384 Woods Hole Road 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 Process_Step: Process_Description: Sample analysis was performed at the U.S. Geological Survey (USGS) Woods Hole Coastal and Marine Science Center, utilizing the USGS Automated Sample Introduction Module (AutoSIM) interfaced to a Picarro G2201-i CRDS that simultaneously measures CH4, CO2, and stable carbon isotope ratios reported in the d-notation relative to Vienna Pee Dee Belemnite (VPDB) referenced gas standards (δ13C-CO2, δ13C-CH4). Check standards for concentration and stable isotopic composition were run approximately every 4-5 samples and corrected as described by Pohlman and others (2021). Concentrations are reported with a relative standard deviation of 0.4% and isotopic ratios are reported with an analytical precision of 0.6‰ based on the precision reported in Pohlman and others (2021). For CO2 concentrations below 300 parts per million (ppm), the analytical precision of the isotopic ratio (d13C_co2) decreases exponentially and was characterized by laboratory measurements. This decrease is be described by the equation: Error = 2.2501*exp(-0.003*pCO2) Where pCO2 is the concentration of the headspace in ppm (co2_ppm). For samples with a concentration under 300 ppm, the reported precision is calculated using this formula. Sample analyses were performed by Shawnee Traylor and Michael Casso under the supervision of John Pohlman. Sample processing occurred in August 2022 and November 2023. Process_Date: 2023 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: John Pohlman Contact_Organization: U.S. Geological Survey, Northeast Region Contact_Position: research geochemist Contact_Address: Address_Type: physical and mailing address Address: USGS, 384 Woods Hole Road 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 Process_Step: Process_Description: Headspace concentrations were converted to dissolved concentrations using the method of Magen and others, 2014. Explicitly, the following equations were used to calculate dissolved concentrations: ((pCO2 * 10^-6 * 0.120) / (R * T_extraction) + (0.880 * pCO2 * 10^-6 * Sol_CO2)) / 0.880 * 10^6 = [CO2] Where pCO2 is the headspace concentration of carbon dioxide in ppm, 0.120 is the volume of gas sample in mL, R is the gas constant in L-atm/mol-K, T_extraction is the extraction temperature in Kelvin, 0.880 is the volume of water sample that was extracted in mL, Sol_CO2 is the solubility of carbon dioxide in mol/L-atm (Weiss, 1974), and [CO2] is the dissolved concentration of carbon dioxide in the original natural water sample, in micromoles per liter. ((pCH4 * 10^-6 * 0.120) / (R * T_extraction) + (0.880 * pCO2 * 10^-6 * Sol_CH4)) / 0.880 * 10^9 = [CH4] Where pCH4 is the headspace concentration of methane in ppm, 0.120 is the volume of gas sample in mL, R is the gas constant in L-atm/mol-K, T_extraction is the extraction temperature in Kelvin, 0.880 is the volume of water sample that was extracted in mL, Sol_CH4 is the solubility of methane in mol/L-atm (Wiesenburg & Guinasso, 1979; Yamamoto et al., 1976), and [CH4] is the dissolved concentration of methane in the original natural water sample, in nanomoles per liter. The data were organized into a Microsoft Excel spreadsheet (Microsoft Excel for Mac) and are available in both XLSX and CSV formats. Process_Date: 20231114 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: John Pohlman Contact_Organization: U.S. Geological Survey, Northeast Region Contact_Position: research geochemist Contact_Address: Address_Type: mailing address Address: USGS, 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543 Country: United States Contact_Voice_Telephone: 508-548-8700 x2213 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 Point_and_Vector_Object_Count: 57 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0000001 Longitude_Resolution: 0.0000001 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: 298.257 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: CamBay_auto-sim_data_2022-2023 Entity_Type_Definition: Aquatic biogeochemical data from samples collected in the Greiner Lake watershed near the hamlet of Cambridge Bay, Canada in June 2022 and June/July 2023. The data are available in XLSX and CSV. The first row of the XLSX is an explanation of the dataset with the second row being columns headings for the data. The first row of the comma separated values file is the column headings (same as second row of Excel). Fields with NaN indicate data were not obtained. Blank values indicate no text for that field Entity_Type_Definition_Source: Producer Defined Attribute: Attribute_Label: sample_id Attribute_Definition: Internal sample identifier that specifies the year of collection and sample number. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Unrepresentable_Domain: text field in the format CamBayYY_S where CamBay refers to the location, YY is the year of the sample, and S is the sample number. Attribute: Attribute_Label: bag_id Attribute_Definition: Internal identifier that specifies the sample bag used. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Unrepresentable_Domain: text value of the sample bag ID used by the lab. For the 2022 campaign, these numbers increase sequentially from 601. The 2023 campaign utilized a different nomenclature, starting with WHOI_#SS, where SS is the sample number. Attribute: Attribute_Label: collectedby_last_first Attribute_Definition: The name of the person who collected the sample in the format of last name, first name. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Unrepresentable_Domain: Text value in the format of last name, first name of the person who collected the sample in the field. Attribute: Attribute_Label: analyzedby_last_first Attribute_Definition: The name of the person who analyzed the sample in the format last name, first name. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Unrepresentable_Domain: Text value in the format of last name, first name of the person who analyzed the sample at the USGS laboratory. Attribute: Attribute_Label: sample_type Attribute_Definition: The type of sample based on the context in and purpose for which the sample was taken. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: environmental Enumerated_Domain_Value_Definition: Scientific sample taken in natural waters. Enumerated_Domain_Value_Definition_Source: Producer defined Attribute: Attribute_Label: location_type Attribute_Definition: Habitat where the sample was taken. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Pond Enumerated_Domain_Value_Definition: A shallow, still, natural body of inland water. Here, refers to small freshwater bodies that appear separate from the Enumerated_Domain_Value_Definition_Source: Producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Lake Enumerated_Domain_Value_Definition: Natural body of inland water. Here, refers to Greiner Lake exclusively. Enumerated_Domain_Value_Definition_Source: Producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: River Enumerated_Domain_Value_Definition: A linear flowing body of water. Here, exclusively referring to the waterway which directly drains water from Greiner Lake and ends in Cambridge Bay. Enumerated_Domain_Value_Definition_Source: Producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Bay Enumerated_Domain_Value_Definition: Indentation of a coastline or shoreline enclosing a part of a body of water; a body of water partly surrounded by land. Here, exclusively refers to samples taken in Cambridge Bay. Enumerated_Domain_Value_Definition_Source: Producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Creek Enumerated_Domain_Value_Definition: A small, shallow waterway connecting the terrestrial system to larger bodies of water such as a river or lake. Enumerated_Domain_Value_Definition_Source: Producer defined Attribute: Attribute_Label: station Attribute_Definition: Alphabetical station ID. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Unrepresentable_Domain: Stations were sampled with varying frequency. Samples were generally taken in duplicate, but this occasionally was not feasible. Some stations were sampled only once (as demonstrated by a single occurrence of a letter), while others were repeated during the field campaign and in both years. Attribute: Attribute_Label: latitude Attribute_Definition: Latitude where sample was taken in decimal degrees with the positive values representing northern hemisphere. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 69.1025400 Range_Domain_Maximum: 69.1861921 Attribute_Units_of_Measure: decimal degrees Attribute_Measurement_Resolution: 0.0000001 Attribute: Attribute_Label: longitude Attribute_Definition: Longitude where sample was taken in decimal degrees with the negative values representing western hemisphere Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -105.0960100 Range_Domain_Maximum: -104.8010798 Attribute_Units_of_Measure: decimal degrees Attribute_Measurement_Resolution: 0.0000001 Attribute: Attribute_Label: date Attribute_Definition: Date on which the sample was taken in mm/dd/yy format. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Unrepresentable_Domain: numeric values presented as text Attribute: Attribute_Label: sample_depth_m Attribute_Definition: Depth below the surface at which sample was taken in meters, estimated based on depth of sampling apparatus. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.1 Range_Domain_Maximum: 1.0 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: .1 Attribute: Attribute_Label: salinity_psu Attribute_Definition: Salinity of sample at time of sample collection as measured by an RBR Concerto conductivity, temperature, and depth probe, expressed in practical salinity units. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.07 Range_Domain_Maximum: 3.22 Attribute_Units_of_Measure: practical salinity units Attribute_Measurement_Resolution: .01 Attribute: Attribute_Label: in_situtemp_C Attribute_Definition: Temperature of sample at time of sample collection as measured by an RBR Concerto conductivity, temperature, and depth probe, expressed in degrees Celsius. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 16.95 Attribute_Units_of_Measure: degrees Celsius Attribute_Measurement_Resolution: .01 Attribute: Attribute_Label: extract_temp_C Attribute_Definition: Temperature of sample at time of gas extraction as measured by a handheld thermometer, expressed in degrees Celsius. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 19.00 Attribute_Units_of_Measure: degrees Celsius Attribute_Measurement_Resolution: .01 Attribute: Attribute_Label: samp_gas_vol_mL Attribute_Definition: Volume of headspace sample collected from extraction in the field, in mL. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 72 Range_Domain_Maximum: 130 Attribute_Units_of_Measure: milli-Liters Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: auto-sim_job Attribute_Definition: Job number under which the samples were processed on the AutoSIM Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: STD-SYS Enumerated_Domain_Value_Definition: Individually run on the alternative CRDS (Naushon) Enumerated_Domain_Value_Definition_Source: Producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: LAB_MMDDYYN Enumerated_Domain_Value_Definition: Format is LAB_MMDDYYN, where MM refers to the month, DD refers to the day, YY refers to the year, and N refers to the which run of the day when more than one run occurred. N is alphabetical, starting at A. These samples were run on the Auto Sampler which processed 16 samples at a time. Enumerated_Domain_Value_Definition_Source: Producer defined Attribute: Attribute_Label: ch4_ppm Attribute_Definition: Concentration of methane in the sample in ppm. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2.14 Range_Domain_Maximum: 735.21 Attribute_Units_of_Measure: parts per million Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: ch4_1sigma Attribute_Definition: Uncertainty of the concentration of methane (1 sigma) in the sample, determined using a 0.4% accuracy. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.01 Range_Domain_Maximum: 2.94 Attribute_Units_of_Measure: parts per million Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: co2_ppm Attribute_Definition: Concentration of carbon dioxide in the sample in ppm. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 117.60 Range_Domain_Maximum: 3532.01 Attribute_Units_of_Measure: parts per million Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: co2_1sigma Attribute_Definition: Uncertainty of the concentration of carbon dioxide (1 sigma) in the sample, determined using a 0.4% accuracy, as described in the process step. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.47 Range_Domain_Maximum: 14.13 Attribute_Units_of_Measure: parts per million Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: d13C_ch4 Attribute_Definition: Carbon isotopic ratio (13C/12C) of dissolved methane (CH4) in the water sample relative to the Vienna Pee Dee Belemnite (VPDB) standard expressed in the standard per mil notation. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NaN Enumerated_Domain_Value_Definition: Below detection limit Enumerated_Domain_Value_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -69.8 Range_Domain_Maximum: -42.8 Attribute_Units_of_Measure: per mil relative to VPDB Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: d13C_ch4_1sigma Attribute_Definition: 1 sigma uncertainty of the carbon isotopic ratio (13C/12C) of dissolved methane (CH4) in the water sample relative to the Vienna Pee Dee Belemnite (VPDB) standard expressed in the standard permil notation. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NaN Enumerated_Domain_Value_Definition: Below detection limit Enumerated_Domain_Value_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.6 Range_Domain_Maximum: 0.6 Attribute_Units_of_Measure: per mil relative to VPDB Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: d13C_co2 Attribute_Definition: Carbon isotopic ratio (13C/12C) of dissolved carbon dioxide (CO2) in the water sample relative to the Vienna Pee Dee Belemnite (VPDB) standard expressed in the standard permil notation. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -31.9 Range_Domain_Maximum: 38.3 Attribute_Units_of_Measure: per mil relative to VPDB Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: d13C_co2_1sigma Attribute_Definition: 1 sigma uncertainty of the carbon isotopic ratio (13C/12C) of dissolved carbon dioxide (CO2) in the water sample relative to the Vienna Pee Dee Belemnite (VPDB) standard expressed in the standard permil notation. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.6 Range_Domain_Maximum: 1.6 Attribute_Units_of_Measure: per mil relative to VPDB Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: ch4_conc_nanomolL-1 Attribute_Definition: Dissolved methane concentration of the water sample, in nanomoles per liter. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 18.3 Range_Domain_Maximum: 6183.1 Attribute_Units_of_Measure: nanmoles per liter Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: co2_conc_micromolL-1 Attribute_Definition: Dissolved carbon dioxide concentration of the water sample, in micromoles per liter. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 6.5 Range_Domain_Maximum: 295.2 Attribute_Units_of_Measure: micromoles per liter Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: comments Attribute_Definition: Extraneous comments about sampling and processing procedures. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: empty cell Enumerated_Domain_Value_Definition: Nothing noted Enumerated_Domain_Value_Definition_Source: Producer defined Attribute_Domain_Values: Unrepresentable_Domain: Comments taken during sampling or processing when something diverged from the standard protocol. Overview_Description: Entity_and_Attribute_Overview: These data are available in a XLSX format and as a CSV file. The first line of the Excel spreadsheet gives general information about the dataset, and the second row contains the headers. The first line of the CSV file is a header line and those labels are the same as the second row of the corresponding Excel spreadsheet. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - ScienceBase Contact_Address: Address_Type: physical and mailing address Address: Denver Federal Center, Building 810, Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov Resource_Description: This dataset contains data in an Excel spreadsheet (CamBay_auto-sim_data_2022-2023.xlsx) and the same information in a CSV file (CamBay_auto-sim_data_2022-2023.csv). Additionally, the dataset contains a browse graphic (Cambridge_Bay_Sampling_Locations.png) and the 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 for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: XLSX Format_Version_Number: Microsoft Excel O365 Format_Information_Content: The dataset contains the data in XLSX and CSV formats, browse graphic, and associated metadata. Transfer_Size: 1 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/671be425d34efed56210dfb1 Network_Resource_Name: https://www.sciencebase.gov/catalog/item/671be425d34efed56210dfb1 Network_Resource_Name: https://doi.org/10.5066/P1UECHWK Access_Instructions: The first link in the list above is to directly download all the data on the page, the second link is to the page to download files individually, and the third link is the DOI link to the data release. Digital_Form: Digital_Transfer_Information: Format_Name: CSV Format_Version_Number: Microsoft Excel O365 Format_Information_Content: The dataset contains the data in XLSX and CSV formats, browse graphic, and associated metadata. Transfer_Size: 1 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/671be425d34efed56210dfb1 Network_Resource_Name: https://www.sciencebase.gov/catalog/item/671be425d34efed56210dfb1 Network_Resource_Name: https://doi.org/10.5066/P1UECHWK Access_Instructions: The first link in the list above is to directly download all the data on the page, the second link is to the page to download files individually, and the third link is the DOI link to the data release. Fees: None Metadata_Reference_Information: Metadata_Date: 20250130 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: John Pohlman 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: 508-548-8700 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. Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998