Sound velocity profiles - locations, images, and text files for sound velocity profiles calculated from XBT and CTD casts conducted during USGS field activities 2017-001-FA and 2017-002 FA

Dates

Publication Date: 2020
Start Date: 2017-05-04
End Date: 2017-09-05

Citation

Baldwin, W.E., Moore, E.M., Worley, C.R., Nichols, A.R., and Ruppel, C.D., 2020, Marine geophysical data collected to support methane seep research along the U.S. Atlantic continental shelf break and upper continental slope between the Baltimore and Keller Canyons during U.S. Geological Survey Field Activities 2017-001-FA and 2017-002-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9Y1MSTN.

Summary

In spring and summer 2017, the U.S. Geological Survey’s Gas Hydrates Project conducted two cruises aboard the research vessel Hugh R. Sharp to explore the geology, chemistry, ecology, physics, and oceanography of sea-floor methane seeps and water column gas plumes on the northern U.S. Atlantic margin between the Baltimore and Keller Canyons. Split-beam and multibeam echo sounders and a chirp subbottom profiler were deployed during the cruises to map water column backscatter, sea-floor bathymetry and backscatter, and subsurface stratigraphy associated with known and undiscovered sea-floor methane seeps. The first cruise, known as the Interagency Mission for Methane Research on Seafloor Seeps and designated as field activity 2017-001-FA, [...]

Summary

In spring and summer 2017, the U.S. Geological Survey’s Gas Hydrates Project conducted two cruises aboard the research vessel Hugh R. Sharp to explore the geology, chemistry, ecology, physics, and oceanography of sea-floor methane seeps and water column gas plumes on the northern U.S. Atlantic margin between the Baltimore and Keller Canyons. Split-beam and multibeam echo sounders and a chirp subbottom profiler were deployed during the cruises to map water column backscatter, sea-floor bathymetry and backscatter, and subsurface stratigraphy associated with known and undiscovered sea-floor methane seeps. The first cruise, known as the Interagency Mission for Methane Research on Seafloor Seeps and designated as field activity 2017-001-FA, was conducted from May 4 to May 11, 2017, and acquired geophysical data to support remotely operated vehicle exploration of seep sites using the Global Explorer, which is operated by Oceaneering International, Inc. Geophysical operations during cruise 2017-002-FA from August 25 to September 6, 2017, were also focused on mapping water column methane plumes, sea-floor seep sites, and subseafloor strata, but primarily supported conductivity, temperature, and depth instrument deployment, surface-water methane-concentration mapping, and water-sampling operations as part of a collaborative study with the University of Rochester of the effect of methane seepage on ocean water biogeochemistry. The National Oceanic and Atmospheric Administration’s Office of Ocean Exploration and Research partially sponsored cruise 2017-001-FA, and the U.S. Department of Energy partially sponsored both cruises.

Contacts

Contact :: Wayne E Baldwin
Originator :: Wayne E Baldwin, Eric Moore, Charles R Worley, Alexander R Nichols, Carolyn Ruppel
Principal Investigator :: Carolyn Ruppel
USGS Program :: Coastal and Marine Hazards and Resources Program
Data Owner :: Woods Hole Coastal and Marine Science Center
USGS Mission Area :: Energy and Minerals
Distributor :: U.S. Geological Survey - ScienceBase

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2017-001-FA_2017-002-FA_SVPdata_meta.xml Original FGDC Metadata	View	36.04 KB	application/fgdc+xml
2017-001-FA_2017-002-FA_SVP_Images.zip “Compressed zip archive of SVP profile PNG images.”		2.8 MB	application/zip
2017_001_2017-002-FA_SVP_ASCII.zip “Compressed zip archive of Caris formatted SVP ASCII text files.”		175.6 KB	application/zip

Shapefile: 2017-001-FA_2017-002-FA_SVPdata.zip
2017-001-FA_2017-002-FA_SVPdata_browse.jpg “Example SVP profile image.”		67.62 KB
2017-001-FA_2017-002-FA_SVPdata.dbf		79.4 KB
2017-001-FA_2017-002-FA_SVPdata.prj		145 Bytes
2017-001-FA_2017-002-FA_SVPdata.cpg		5 Bytes
2017-001-FA_2017-002-FA_SVPdata.sbn		580 Bytes
2017-001-FA_2017-002-FA_SVPdata.sbx		132 Bytes
2017-001-FA_2017-002-FA_SVPdata.shp “Shapefile containing SVP profile locations. ”		1.49 KB
2017-001-FA_2017-002-FA_SVPdata.shx		508 Bytes

Related External Resources

Type: Related Primary Publication

Demopoulos, A., McClain-Counts, J., Bourque, J., Prouty, N., Smith, B., Brooke, S.D., Ross, S., and Ruppel, C., 2019, Examination of Bathymodiolus childressi nutritional sources, isotopic niches, and food-web linkages at two seeps in the US Atlantic margin using stable isotope analysis and mixing models: Deep Sea Research Part I, 148, 53-66.	https://doi.org/10.1016/j.dsr.2019.04.002
Leonte, M., Ruppel, C. D., Ruiz‐Angulo, A., & Kessler, J. D. (2020). Surface methane concentrations along the Mid‐Atlantic Bight driven by aerobic subsurface production rather than seaﬂoor gas seeps: Journal of Geophysical Research: Oceans, vol. 125.	https://doi.org/10.1029/2019JC015989
Ruppel, C., Demopoulos, A., and Prouty, N., 2018, Exploring US Mid-Atlantic Margin Methane Seeps: IMMeRSS, May 2017: Supplement to Oceanography, 31(1), p. 93.	https://doi.org/10.5670/oceanog.2018.supplement.01

Purpose

This dataset is used to display the locations of sound velocity profiles (SVP, also referred to as sound speed profiles), as well as the SVP data, collected using Sippican XBT probes and a Seabird Electronics 911plus CTD during two 2017 USGS cruises along the U.S. Atlantic continental shelf break and upper continental slope between Accomac and Keller Canyons. The sound velocity profiles document water column sound speed variability during the cruises, and were used during processing to account for refraction artifacts present within the multibeam bathymetric data. The dataset contains graphs of the sound velocity profile at each station, as well as the date of collection, time of day, and station location coordinates in Geographic Coordinate System (GCS) WGS 84 latitude and longitude.

Sound velocity profiles - locations, images, and text files for sound velocity profiles calculated from XBT and CTD casts conducted during USGS field activities 2017-001-FA and 2017-002 FA

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