CTD (conductivity-temperature-depth) data collected on Stellwagen Bank during U.S. Geological Survey field activity 2017-043-FA, aboard the R/V Auk, Aug. 22 and 23, 2017

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Page C. Valentine
Publication_Date: 2018
Title:

CTD (conductivity-temperature-depth) data collected on Stellwagen Bank during U.S. Geological Survey field activity 2017-043-FA, aboard the R/V Auk, Aug. 22 and 23, 2017

Edition: 1.0
Geospatial_Data_Presentation_Form: text files of water column profile data
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9A57QWI

Publication_Information:

Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program

Online_Linkage: https://doi.org/10.5066/P9A57QWI
Online_Linkage:

https://cmgds.marine.usgs.gov/data/field-activity-data/2017-043-FA/

Larger_Work_Citation:

Citation_Information:

Originator: Page C. Valentine
Originator: VeeAnn A. Cross
Publication_Date: 2018
Title:

Sea-Floor Sediment Samples, Seabed Imagery, and CTD Instrument Data Collected on Stellwagen Bank in August 2017, U.S. Geological Survey Field Activity 2017-043-FA

Edition: 1.0
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9A57QWI

Publication_Information:

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

Other_Citation_Details:

Suggested citation: Valentine, P.C., and Cross, V.A., 2018, Sea-floor sediment samples, seabed imagery, and CTD instrument data collected on Stellwagen Bank in August 2017, U.S. Geological Survey Field Activity 2017-043-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9A57QWI.

Online_Linkage: https://doi.org/10.5066/P9A57QWI
Online_Linkage:

https://cmgds.marine.usgs.gov/data/field-activity-data/2017-043-FA/

Description:

Abstract:

This field activity is part of an effort to map geologic substrates of the Stellwagen Bank National Marine Sanctuary region off Boston, Massachusetts. The overall goal is to develop high-resolution (1:25,000-scale) interpretive maps, based on multibeam sonar data and seabed sampling, showing surficial geology and seabed sediment dynamics. The data collected in this study will aid research on the ecology of fish and invertebrate species that inhabit the region. On August 22 and 23, 2017, the U.S. Geological Survey, in collaboration with the Stellwagen Bank National Marine Sanctuary, conducted a research cruise aboard the Sanctuary’s Research Vessel Auk, visiting 39 locations within the sanctuary. A customized Van Veen grab sampler (SEABOSS) equipped with a video camera and a conductivity, temperature, and depth (CTD) instrument was deployed in drift mode to collect sediment for grain-size analysis, video imagery of the seabed, and measurements of water column properties.

Purpose:

These data are collected to map the seasonal temperature, salinity, density, fluorescence (chlorophyll A), and turbidity configuration of the water column which affect the distribution and availability of plankton and the distribution of fish and invertebrate species.

Supplemental_Information:

Additional information regarding this field activity is available from https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-043-FA.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20170822
Ending_Date: 20170823

Currentness_Reference: ground condition of when data were collected.

Status:

Progress: complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -70.408960
East_Bounding_Coordinate: -70.226370
North_Bounding_Coordinate: 42.194880
South_Bounding_Coordinate: 42.084520

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:c340028e-51a3-4e57-baf5-e0995ae22a21

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme_Keyword: Woods Hole Coastal and Marine Science Center
Theme_Keyword: WHCMSC
Theme_Keyword: CTD
Theme_Keyword: conductivity
Theme_Keyword: temperature
Theme_Keyword: depth
Theme_Keyword: salinity
Theme_Keyword: water density
Theme_Keyword: fluorescence
Theme_Keyword: turbidity
Theme_Keyword: SEABed Observation and Sampling System
Theme_Keyword: SEABOSS

Theme:

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

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: CTD measurement
Theme_Keyword: ocean sciences
Theme_Keyword: ocean salinity
Theme_Keyword: ocean temperature
Theme_Keyword: turbidity

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: North America
Place_Keyword: United States
Place_Keyword: Massachusetts
Place_Keyword: Atlantic Ocean
Place_Keyword: Stellwagen Bank
Place_Keyword: Stellwagen Bank National Marine Sanctuary
Place_Keyword: SBNMS
Place_Keyword: Massachusetts Bay

Access_Constraints: None.
Use_Constraints: Not to be used for navigation.
Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: Page C. Valentine

Contact_Position: Research Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA

Contact_Voice_Telephone: (508) 548-8700 x2239
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: pvalentine@usgs.gov

Cross_Reference:

Citation_Information:

Originator: D.S. Blackwood
Originator: K.F. Parolski
Publication_Date: 2001
Title: Seabed observation and sampling system
Series_Information:

Series_Name: Sea Technology
Issue_Identification: v. 42, no. 2, p.39-43

Cross_Reference:

Citation_Information:

Originator: P. Valentine
Originator: D. Blackwood
Originator: K. Parolski
Publication_Date: 2000
Title: Seabed observation and sampling system
Series_Information:

Series_Name: U.S. Geological Survey Fact Sheet
Issue_Identification: FS-142-00

Publication_Information:

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

Online_Linkage: https://pubs.usgs.gov/fs/fs142-00/

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

These files represent unedited data acquired from the Sea-Bird CTD that was mounted on the SEABOSS system. The data were collected during the descent (downcast) of the SEABOSS to the seabed, its drift over the seabed, and its ascent (upcast) to the water surface. The data values presented here have not been edited or modified. The data accuracy is expected to meet the instrument accuracy specifications.

Logical_Consistency_Report:

The filenames correspond to the station names. Therefore the navigation for the casts can be acquired from the station locations in the station data summary file (available from the larger work citation). The naming convention for the CTD casts is staXXXX_ctd_data.txt where XXXX corresponds to the station number.

Completeness_Report:

The Sea-Bird instrument is mounted on the SEABOSS system. All data (downcast, drift, and upcast) are included. All SEABOSS stations on the cruise have a CTD record. There are a total of 39 CTD data files.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Although these files do not contain latitudes and longitudes, that information can be acquired from the related station data summary file (available from the Larger Work citation). The CTD downcast is located at the start of the video drift, and the upcast is located at the end of the video drift. The location information for stations was acquired from a satellite navigation receiver (Furuno satellite compass SC-30, GPS receiver) at two second intervals with a horizontal accuracy of 10 m. The navigation antenna is located 5.3 m forward of the SEABOSS deployment location. This offset was not accounted for in the navigation acquisition (navigation fixes represent antenna location).

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

The depth values are based on the instrument's pressure gauge and are relative to the local sea surface. The CTD is mounted horizontally on the SEABOSS frame and its maximum depth is approximately 1 meter above the seabed.

Lineage:

Process_Step:

Process_Description:

These data were collected with a Sea-Bird CTD (conductivity, temperature, depth) instrument - a SBE19plusV2 SeaCAT Profiler CTD. This instrument was deployed on the USGS SEABed Observation and Sampling System (SEABOSS). The SEABOSS is an instrument developed by the USGS to collect samples and video and photographic images of the seabed to aid in the interpretation of seabed sonar imagery. The CTD is mounted horizontally on the SEABOSS frame and its maximum depth is approximately 1 meter above the seabed. The specifications for the CTD instrument are as follows:

SBE19plusV2, manufactured by Sea-Bird Electronics, Inc.

Firmware version: 2.2c
Firmware date: 7 December 2009
Manufactured date: 29 July 2010
Software version: 2.3.0

Internal sensors:

main temperature, serial number 01906617
main conductivity, serial number 01906617
main pressure, type, strain, serial number 3161799

External sensors from WET Labs:

ECO-FLNTURT CHL, serial number FLNTURT-1798; WET Labs fluorometer, ECO-AFL/FL
ECO-FLNTURT TURB, serial number FLNTURT-1798; WET Labs turbidity meter, ECO-NTU

Configuration:

Instrument battery operated; not connected to a conducting cable
Profile mode: sampling rate 4 per second, averaged to provide each data point
CTD deployed on the USGS SEABed Observation and Sampling System (SEABOSS)

Data archive:

All data; downcast, drift, and upcast

Sensor specifications:

Temperature (degrees C):

measurement range -5 to +35 degrees C; initial accuracy +-0.005; resolution 0.0001;

Conductivity (S/m):

measurement range 0 to 9 S/m; initial accuracy +- 0.0005; resolution varies: 0.00005 (most oceanic water; resolves 0.4 ppm in salinity); 0.00007 (high salinity water; resolves 0.4 ppm in salinity); 0.00001 (fresh water; resolves 0.1 ppm in salinity)

Strain gauge pressure:

measurement range 0 to full scale range: 20/100/350/600/1000/2000/3500/7000; initial accuracy +- 0.1% of full scale range; resolution 0.002% of full scale range.

Turbidity sensor:

wavelength 700 nm; sensitivity 0.01 NTU, rant 0-25 NTU

Fluorescence sensor:

Chlorophyll-a 470 nm EX/695 nm EM; sensitivity 0.2 micro-g/l; range 0-125 micro-g/l Chl

Process_Date: 2017
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: Page C. Valentine

Contact_Position: Research Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA

Contact_Voice_Telephone: (508) 548-8700 x2239
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: pvalentine@usgs.gov

Process_Step:

Process_Description:

The Sea-Bird instrument is mounted on the SEABOSS system. All data (downcast, drift, upcast) are included. At the end of the cruise, the CTD data are downloaded via a laptop using the Sea-Bird software. The latitude and longitude of the start and end of the video drift are available from 2017-043-FA_station_data_summary dataset, available from the Larger Work citation, which represents the start and end locations of the CTD data collection. The station summary data are available in XLSX, CSV, and shapefile formats.

Process_Date: 2017

Process_Step:

Process_Description:

Added keywords section with USGS persistent identifier as theme keyword.

Process_Date: 20200908
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross

Contact_Position: Marine Geologist
Contact_Address:

Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598

Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov

Spatial_Reference_Information:

Vertical_Coordinate_System_Definition:

Depth_System_Definition:

Depth_Datum_Name: local surface
Depth_Resolution: 0.001
Depth_Distance_Units: meters
Depth_Encoding_Method: Implicit coordinate

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Sea-Bird CTD upcasts
Entity_Type_Definition:

The data from each station is included in an ASCII text file with an eleven row header that gives the station number and the output format of the data - what information is in each column. The remaining rows are columns of measured values that are space delimited.

Entity_Type_Definition_Source: Sea-Bird Electronics

Attribute:

Attribute_Label: salt water depth, meter (0.000)
Attribute_Definition:

Calculated value involving pressure, water density and compressibility as well as the strength of the local gravity field. Units are meters.