Page C. Valentine
2019
CTD (conductivity-temperature-depth) data collected on Stellwagen Bank during U.S. Geological Survey field activity 2017-030-FA, aboard the R/V Auk, May 18-23, 2017
1.0
profile - water column
data release
DOI:10.5066/P94GOZ7C
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Hazards and Resources Program
https://doi.org/10.5066/P94GOZ7C
https://cmgds.marine.usgs.gov/data/field-activity-data/2017-030-FA/
Page C. Valentine
VeeAnn A. Cross
2019
Sea-floor sediment samples, seabed imagery, and CTD instrument data collected on Stellwagen Bank in May 2017, U.S. Geological Survey Field Activity 2017-030-FA
1.0
data release
DOI:10.5066/P94GOZ7C
Reston, VA
U.S. Geological Survey
Suggested citation: Valentine, P.C., and Cross, V.A., 2019, Sea-floor sediment samples, seabed imagery, and CTD instrument data collected on Stellwagen Bank in May 2017, U.S. Geological Survey Field Activity 2017-030-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P94GOZ7C.
https://doi.org/10.5066/P94GOZ7C
https://cmgds.marine.usgs.gov/data/field-activity-data/2017-030-FA/
This field activity is part of the 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) interpretive maps, based on multibeam sonar data and seabed sampling, showing surficial geology and seabed sediment dynamics. This cruise was conducted in collaboration with the Stellwagen Bank National Marine Sanctuary, and the data collected will aid research on the ecology of fish and invertebrate species that inhabit the region. The Sanctuary's research vessel, R/V Auk, visited 50 locations on Stellwagen Bank at which a customized Van Veen grab sampler (SEABOSS) equipped with a video camera and a CTD was deployed in drift mode to collect sediment for grain-size analysis, video imagery of the seabed, and measurements of water column properties.
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.
Additional information regarding the field activity can be obtained from https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-030-FA.
20170518
20170523
ground condition when data were collected. Actual dates of collection May 18, 19, and 23, 2017
None planned
-70.458560
-70.134090
42.420730
42.171150
None
U.S. Geological Survey
USGS
Coastal and Marine Hazards and Resources Program
CMHRP
Woods Hole Coastal and Marine Science Center
WHCMSC
CTD
conductivity
temperature
depth
salinity
water density
fluorescence
turbidity
ISO 19115 Topic Category
oceans
geoscientificInformation
USGS Thesaurus
marine chemistry
CTD measurement
ocean temperature
ocean salinity
turbidity
ocean sciences
Marine Realms Information Bank (MRIB) keywords
chemical oceanography
environmental chemistry
oceanographic observations
None
North America
United States
Massachusetts
Atlantic Ocean
Stellwagen Bank
Stellwagen Bank National Marine Sanctuary
SBNMS
Massachusetts Bay
None.
Not to be used for navigation.
U.S. Geological Survey
Page C. Valentine
Research Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
(508) 548-8700 x2239
(508) 457-2310
pvalentine@usgs.gov
D.S. Blackwood
K.F. Parolski
2001
Seabed observation and sampling system
Sea Technology
v. 42, no. 2, p.39-43
P. Valentine
D. Blackwood
K. Parolski
2000
Seabed observation and sampling system
U.S. Geological Survey Fact Sheet
FS-142-00
Reston, VA
U.S. Geological Survey
https://doi.org/10.3133/fs14200
https://pubs.usgs.gov/fs/fs142-00/
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.
The filenames correspond to the station names. Therefore the locations of the casts can be acquired from the station locations in the station data summary file (available from the Larger Work). The naming convention for the CTD casts is staXXXX_ctd_data.txt where XXXX corresponds to the station number.
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 50 CTD data files.
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).
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.
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). See the cross-references for additional information on this system. 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, serial number 01906617 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
>
The temperature (degrees C) sensor has the following specifications:
>measurement range -5 to +35 degrees C; initial accuracy +-0.005; resolution 0.0001;
>
The conductivity (S/m) has the following specifications:
>
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)
>
The 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.
>
The 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
2017
U.S. Geological Survey
Page C. Valentine
Research Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
(508) 548-8700 x2239
(508) 457-2310
pvalentine@usgs.gov
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 2017-030-FA_station_data_summary dataset, available from the Larger Work citation. The station summary data are available in XLSX, CSV, and shapefile formats.
2017
0.000001
0.000001
Decimal degrees
D_WGS_1984
WGS_1984
6378137.000000
298.257224
local surface
0.001
meters
Implicit coordinate
Sea-Bird CTD
The data from each station is included in an ASCII text file with an 11-row header that gives the station number and the output format of the data - what information is in each column. The remaining rows (starting at row 12) are columns of measured values that are space-delimited, and which correspond to the columns listed in the header.
Sea-Bird Electronics
salt water depth, meter (0.000)
Calculated value involving pressure, water density and compressibility as well as the strength of the local gravity field. Units are meters.
Sea-Bird Electronics
Although this is a numeric value, the data value range for the dataset has not been evaluated.
water temperature (standard ITS-90), deg C (0.0000)
Temperature directly measured by the temperature-sensing instrument (thermistor). Units are degrees Celsius.
Sea-Bird Electronics
Although this is a numeric value, the data value range for the dataset has not been evaluated.
salinity, practical salinity units (PSU) (0.0000)
Calculated value derived from the measured properties (conductivity, temperature and pressure) of the instrument. Units are practical salinity units.
Sea-Bird Electronics
Although this is a numeric value, the data value range for the dataset has not been evaluated.
water density, sigma-t, kilograms per cubic meter (0.0000)
Calculated value derived from the measured properties (conductivity, temperature and pressure) of the instrument. Units are kilograms per cubic meter.
Sea-Bird Electronics
Although this is a numeric value, the data value range for the dataset has not been evaluated.
fluorescence, milligrams per cubic meter (0.0000)
Fluorescence is a measurement of chlorophyll A concentration in a volume of seawater. Units are milligrams per cubic meter.
Sea-Bird Electronics
Although this is a numeric value, the data value range for the dataset has not been evaluated.
turbidity, nephelometric turbidity units (NTU) (0.0000)
Turbidity is a measurement of particles in a volume of seawater. Units are nephelometric turbidity units.
Sea-Bird Electronics
Although this is a numeric value, the data value range for the dataset has not been evaluated.
if data flagged, indicates error in data collection
System method of indicating erroneous or bad data.
Sea-Bird Electronics
A value other than zero indicates an error in data collection
The following is a sample header and a few rows of the data:
>
>Sta 4579
>Output data format
>Column 1, salt water depth, meter (0.000)
>Column 2, water temperature (standard ITS-90), deg C (0.0000)
>Column 3, salinity, practical salinity units (PSU) (0.0000)
>Column 4, water density, sigma-t, kilograms per cubic meter (0.0000)
>Column 5, fluorescence, milligrams per cubic meter (0.0000)
>Column 6, turbidity, nephelometric turbidity units (NTU) (0.0000)
>Column 7, if data flagged, indicates error in data collection
>-0.196 21.2059 0.0000 -2.0511 -0.0449 -0.0084 0.000e+00
>-0.198 21.2044 0.0000 -2.0508 -0.0403 0.1717 0.000e+00
>-0.198 21.2032 0.0000 -2.0505 0.0299 0.0221 0.000e+00
>-0.199 21.2022 0.0000 -2.0503 0.0116 0.0500 0.000e+00
>-0.199 21.1997 0.0000 -2.0498 -0.0052 0.0545 0.000e+00
>-0.199 21.1985 0.0000 -2.0495 -0.0090 -0.0076 0.000e+00
>-0.199 21.1982 0.0000 -2.0494 -0.0006 0.0099 0.000e+00
>
If visible in the sample above, the presence of the ">" character is for formatting the metadata only. That character does not actually occur in the data.
The zeros associated with each column definition indicate the number of decimal places of the recorded values.
U.S. Geological Survey
U.S. Geological Survey
Page C. Valentine
Research Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
(508) 548-8700 x2239
(508) 457-2310
pvalentine@usgs.gov
2017-030-FA_CTD.zip contains the 50 CTD data files and the FGDC CSDGM metadata in TXT, XML, and HTML formats.
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
TEXT
The zip file contains the CTD cast data and the associated FGDC CSDGM metadata.
1
https://cmgds.marine.usgs.gov/data/field-activity-data/2017-030-FA/data/chemistry/2017-030-FA_CTD.zip
https://doi.org/10.5066/P94GOZ7C
https://cmgds.marine.usgs.gov/data/field-activity-data/2017-030-FA/
The first link is to download the data in a zip file. The second and third links are to the landing page of the data. The links go to the same place, one is the DOI designation of the publication.
none
The zip file contains CTD data in TEXT format. The user must have software capable of uncompressing the zip file and using the data files.
20191011
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02556-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998