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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
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, [...]

Contacts

Attached Files

Click on title to download individual files attached to this item.

2017-001-FA_2017-002-FA_SVP_Images.zip
“Compressed zip archive of SVP profile PNG images.”
2.8 MB
2017_001_2017-002-FA_SVP_ASCII.zip
“Compressed zip archive of Caris formatted SVP ASCII text files.”
175.6 KB
Shapefile: 2017-001-FA_2017-002-FA_SVPdata.zip
2017-001-FA_2017-002-FA_SVPdata_browse.jpg
“Example SVP profile image.”
thumbnail 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

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.

Additional Information

Shapefile Extension

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