Measurements of natural hydrocarbon gas flux in the Coal Oil Point seep field (COP1710, EK80)

On 26 October 2017, acoustic data was collected in tandem with direct, in situ gas flux measurements. Acoustic data was collected using a Simrad ES200-7C split-beam echosounder that was interfaced with an EK80 Wideband Transceiver. The echosounder was operated over a frequency bandwidth of 160-260 kHz. Direct measurements of gas flux were obtained using a bubble catch device (BCD) that was designed to capture gas in an inverted graduated cylinder through a funnel. An underwater camera that was attached to the BCD was used to capture images of the accumulation of gas within the cylinder. The echosounder was pole-mounted to the port side of the R/V Connell, while the BCD was hand deployed from the starboard side of the vessel. A Garmin WAAS-enabled GPS system was interfaced with the EK80 software to provide position of the vessel throughout the survey.

Collection of both acoustic data and direct gas flux measurements were obtained at three seep sites located within the Coal Oil Point seep field: Platform Holly, Seep Tent and La Goleta. Data collection was obtained by positioning the vessel in locations of high seepage activity (verified with the acoustic data) and then allowing the vessel to drift over the area until no seepage activity was observed. Both the acoustic data and the direct gas flux measurements were collected simultaneously throughout the survey. The BCD was deployed at a depth of 23 m at La Goleta and Seep Tent and at 15 m at Platform Holly. A total of 20 .MP4 files were obtained with the BCD.

A preliminary test run of the BCD was conducted at the La Goleta seep site at 1532 UTC. Following the BCD test, both acoustic data and video images from the BCD were acquired at the La Goleta seep site. At approximately 1930 UTC, data collection at La Goleta was completed and the R/V Connell transited to the Seep Tent seep site. Data collection at Seep Tent commenced at approximately 1956 UTC and was completed at 2116 UTC. A CTD cast was performed after the survey near Seep Tent. A field calibration was done for the ES200-7C split-beam echosounder following the CTD cast with a 28.5 mm Tungsten-Carbide calibration spheres. At 2150 UTC, the R/V Connell arrived at Platform Holly in order to collect both acoustic and BCD measurements. Data collection with the BCD finished at 2244 UTC and a final acoustic survey in the vicinity of Platform Holly was conducted between 2256 UTC and 2357 UTC.
  • Cite as: Alexandra Padilla, Scott Loranger, Frank Kinnaman, David Valentine, Tom Weber (2019): Water Column Sonar Data Collection (COP1710, EK80). National Centers for Environmental Information, NOAA. doi:10.25921/1q3m-3689 [access date].
gov.noaa.ngdc.mgg.wcd:COP1710_EK80
Search Data
Distribution Formats
  • Simrad EK80 raw (.raw) format (Version: 1)
    • File Specification: Simrad EK80 raw files. See the Simrad EK80 interface specification manual for additional information.
Ordering Instructions Contact the NCEI Water Column Sonar Data Manager to order data
Distributor Chuck Anderson
Water Column Sonar Data Manager
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
(303) 497-4742
wcd.info@noaa.gov
Dataset Principal Investigator Alexandra Padilla
Graduate Student
UNH/CCOM

apadilla@ccom.unh.edu
Dataset Principal Investigator Scott Loranger

UNH/CCOM

sloranger@ccom.unh.edu
Dataset Principal Investigator Frank Kinnaman

UCSB

frank_kinnaman@ucsb.edu
Dataset Principal Investigator Dave Valentine
Professor
University of Califonria, Santa Barbara
805-893-2973
valentine@geol.ucsb.edu
Dataset Principal Investigator Tom Weber
Assistant Professor
UNH/CCOM-JHC
603-862-1659
weber@ccom.unh.edu
Time Period 2017-10-26T15:30:01 to 2017-10-26T23:59:34
Spatial Reference System urn:ogc:def:crs:EPSG:4326
Spatial Bounding Box Coordinates
N: 34.39187
S: 34.37295
E: -119.8525
W: -119.90934
Spatial Coverage Map
General Documentation
Associated Resources
    Publication Dates
    • creation: 2017-10-26
    Dataset Progress Status Complete - production of the data has been completed
    Data Update Frequency Not planned
    Purpose The cruise was conducted to obtain estimates of gas flux in the region using both acoustic and direct capture methods.
    Use Limitations
    • These data are considered raw and have not been subjected to the NOAA's quality control or quality assurance procedures. They are released for limited public use as preliminary data to be used only with appropriate caution. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
    • Not subject to copyright protection within the United States.
    Dataset Citation
    • Cite as: Alexandra Padilla, Scott Loranger, Frank Kinnaman, David Valentine, Tom Weber (2019): Water Column Sonar Data Collection (COP1710, EK80). National Centers for Environmental Information, NOAA. doi:10.25921/1q3m-3689 [access date].
    Custodians
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Resource Providers
    • UNH/CCOM-JHC> Center for Coastal and Ocean Mapping - Joint Hydrographic Center
    Sponsors
    • University of California - Santa Barbara
    • University of California - Santa Barbara
    Points of Contact
    • UNH/CCOM-JHC> Center for Coastal and Ocean Mapping - Joint Hydrographic Center
    • UNH/CCOM-JHC> Center for Coastal and Ocean Mapping - Joint Hydrographic Center
    • UNH/CCOM-JHC> Center for Coastal and Ocean Mapping - Joint Hydrographic Center
    Publishers
    • NOAA National Centers for Environmental Information
    Theme keywords Global Change Master Directory (GCMD) Science Keywords
    • EARTH SCIENCE > Oceans > Ocean Acoustics > Acoustic Scattering
    • EARTH SCIENCE > Oceans > Aquatic Sciences > Fisheries
    • EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry
    • EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS
    • EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS
    • Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Benthic
    • Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Pelagic
    • EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
    Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Instrument keywords Global Change Master Directory (GCMD) Instrument Keywords
    • In Situ/Laboratory Instruments > Profilers/Sounders > Acoustic Sounders > WCMS > Water Column Mapping System
    Place keywords International Hydrographic Organization (IHO) Sea Area ("Limits of Oceans and Seas" publication S-23)
    • North Pacific Ocean
    Global Change Master Directory (GCMD) Location Keywords
    • GEOGRAPHIC REGION > GLOBAL
    • VERTICAL LOCATION > SEA FLOOR
    Use Constraints
    • Cite as: Alexandra Padilla, Scott Loranger, Frank Kinnaman, David Valentine, Tom Weber (2019): Water Column Sonar Data Collection (COP1710, EK80). National Centers for Environmental Information, NOAA. doi:10.25921/1q3m-3689 [access date].
    Access Constraints
    • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
    • Resource may not be available for up to one year after initial collection.
    Fees
    • Free
    Lineage information for: series
    Processor
    • UNH/CCOM
    Lineage information for: series
    Lineage Statement EK80 raw data files collected at the La Goleta seep site are named incorrectly as "Patch_bubblecatch-D..." and "Patch_acousticline-D...". The times presented in the filenames for both thte EK80 data and video files from the BCD are reported in UTC.
    Acquisition Information (collection)
    Instrument
    • Simrad EK80
    • Simrad EK80
    Platform
    • Connell
    Operation
    • COP1710_EK80
    Last Modified: 2019-02-19
    For questions about the information on this page, please email: wcd.info@noaa.gov