Alicia F. Balster-Gee Wayne E. Baldwin Patrick E. Hart 20220920 comma-delimited text data release DOI:10.5066/P9EHITBI Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P9EHITBI Alicia F. Balster-Gee Wayne E. Baldwin Patrick E. Hart 2022 data release DOI:10.5066/P9EHITBI Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/P9EHITBI Sound velocity and CTD (conductivity, temperature, depth) cast data were collected at 9 sites offshore Santa Cruz, CA during USGS field activity 2021-619-FA in April of 2021. Aboard the R/V Parke Snavely (RVPS), a SonTek CastAway-CTD was used to collect these data at in the upper 67 meters of the water column. these data is provided in csv format, a shapefile of cast locations, as well as PNG plots of the speed of sound as a function of depth for each cast location. These data were collected to provide information about the water temperature, conductivity, salinity, pressure, and sound velocity as a function of depth during the 2021-619-FA marine sparker source testing. The two-vessel survey was designed to quantify the decay of sound emitted from the SIG ELP790 minisparker (powered at 700 joules) and from the Applied Acoustics Delta Sparker (powered at 1.0 and 2.4 kilojoules) as a function of distance during marine geophysical surveys. Additional information about the field activity from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-619-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology. 20210419 20210428 ground condition at time data were collected Complete None planned -122.47431993 -121.81507587 37.09648707 36.72920243 USGS Metadata Identifier USGS:a26a06ce-7031-46fa-b717-52350cf93f7b ISO 19115 Topic Category oceans geoscientificInformation location Data Categories for Marine Planning Water Column Features Water-Quality Parameters USGS Thesaurus ocean sciences ocean salinity ocean temperature marine chemistry navigational data geospatial datasets profiles sound velocity ocean sciences navigational data marine geophysics Marine Realms Information Bank (MRIB) keywords data processing Global Positioning System (GPS) observations oceanographic observations None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Woods Hole Coastal and Marine Sciences Center WHCMSC Geographic Names Information System (GNIS) Pacific Ocean State of California Monterey Bay Santa Cruz NGA GEOnet Names Server (GNS) Monterey Canyon Soquel Canyon None USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator of the dataset and in products derived from these data. This information is not intended for navigation purposes. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov 2021-619-FA_SVcast_CC1624004_20210426_165412.png An example sound velocity profile plot image for cast CC1624004_20210426_165412 at the L50A depth site. PNG The authors acknowledge our fellow participants of the sparker testing field activity 2021-619-FA (Pete Dal Ferro, Gerry Hatcher, Jared Kluesner, Rachel Marcuson, Jenny McKee, Dan Powers and Rob Wyland) and our team involved in survey planning and execution (Jackson Currie, William Danforth, Jane Denny, Tim Elfers, Dave Foster, Nathan Miller, Eric Moore and Carolyn Ruppel). Sontek Castaway-CTD output the 9 ASCII csv data files. Using Anaconda (v. 4.10.1), Python (v.3.7), and Jupyter notebook (v. 6.0.0), the raw csv files were read and used to plot the sound velocity (meters per second) column as a function of the depth (meters) column and titled with the csv files name and the date/timestamp for the cast. This information is also included in the cast location shapefile (ESRI) produced using SQLite (version 3.21.0). The SonTek CastAway-CTD conductivity, temperature, and pressure sensors were calibrated in November of 2019. The electronics component arrived calibrated from the manufacturer (https://www.sontek.com/castaway-ctd). This information is contained in the header rows for each cast csv file. All values fall within expected ranges of temperature, specific conductance, and depth. Data have been checked for duplication and omission. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. SonTek CastAway-CTD data has a stated GPS accuracy of 10 meters. Each cast csv file contains the horizontal error (in meters) for the start and end GPS locations in header rows 13 and 19, respectively. SonTek CastAway-CTD depth data has a stated accuracy of +/-0.25 percent FS. CSV header rows 14 and 20 have the start GPS vertical error and end GPS vertical error, respectively, in meters for each cast location. Casts were taken at various depths to a maximum of 66 meters, this maximum depth data can be found in Depth column of each csv file. SonTek CastAway-CTD ASCII csv data were downloaded at the end of each field day. 20210428 A Python Jupyter notebook ‘2021-619-FA_CastPlots.ipynb’ was used to read the CTD cast csv data and plot the depth in meters column vs. the speed of sound in meters per second column for each cast site. This python notebook also plotted the csv file name as a title and the date/time stamp and latitude and longitude coordinate info as a text header just below the title. 20220304 Python Jupyter notebook ‘SparkerAndSVcastNavToSQLdb.ipynb’ was used to extract the cast name, cast image (plot) name, longitude, latitude, UTC day/time stamp, Survey identifier (2021-619-FA), vehicle identifier (R/V Parke Snavely), and the device identifier (SonTek CastAway-CTD), and include these information as attributes in a multipoint shapefile named 2021-619-FA_RVPS_SoundVelCTD_location.shp of cast locations. 20220304 Edits were made to correct spelling in author name. No data were changed. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata date of this file to any similar file to ensure they are using the most recent version. (scochran@usgs.gov) 20230516 Point Point 9 0.000001 0.000001 Decimal degrees D_WGS_1984 WGS_1984 6378137.000000 298.257224 International Equation of State for sea water (EOS-80) 0.01 meters Explicit elevation coordinate included with horizontal coordinates 2021-619-FA_RVPS_SoundVelCTD_csv.zip zip file containing 9 CTD cast csv data files. First 28 rows of each csv file contain information about the cast sample. Producer defined Pressure (Decibar) pressure readings at each sample point measured in decibars. Producer defined 0.15 66.85334587 Decibar 0.00000001 Depth (Meter) depth readings at each sample point measured in meters below sea level. Producer defined 0.149193091 66.46995328 meters below sea level 0.00000001 Temperature (Celsius) water temperature readings at each sample point measured in Celsius. Producer defined 9.035969143 11.13141155 celsius 0.00000001 Conductivity (MicroSiemens per Centimeter) conductivity readings at each sample point measured in MicroSiemens per centimeter. Producer defined 36412.66021 38231.92969 MicroSiemens per centimeter 0.00001 Salinity (Practical Salinity Scale) salinity readings at each sample point measured in practical salinity scale. Producer defined 33.95811296 34.2389649 Practical Salinity scale 0.0000001 Sound Velocity (Meters per Second) sound velocity readings at each sample point measured in meters per second. Producer defined 1486.249233 1492.713653 meters per second 0.000001 2021-619-FA_RVPS_SoundVelCTD_plots_png.zip Zip file containing 9 sound-velocity profile (SVP) plots, one SVP plot per CTD cast location, in PNG format. Speed of sound is plotted as a function of depth. Cast location latitude and longitude and cast date and time are included at the top of each plot. U.S. Geological Survey 2021-619-FA_RVPS_SoundVelCTD_location_shapefile.zip zip file contains a shapefile of CTD cast locations and acquisition information U.S. Geological Survey cast Name of velocity profile used to distinguish between casts. Producer Defined Unique profile names are automatically generated from the SonTek CastAway CTD instrument. Profile names are in the format: “CC1624004_YYYYMMDD_HHMMSS” where CC1624004 refers to the CTD Device ID, followed by the date stamp in YYYYMMDD format and the UTC timestamp in HHMMSS format. castimage Name of the Sound Velocity profile plot image. Names are the same as the cast identifier with the .png file extension. Producer defined. Unique profile names are automatically generated from the SonTek CastAway CTD instrument. Profile names are in the format: “CC1624004_YYYYMMDD_HHMMSS” where CC1624004 refers to the CTD Device ID, followed by the date stamp in YYYYMMDD format and the UTC timestamp in HHMMSS format. Lon decimal degree longitude value in WGS 84 producer defined -122.3334 -121.9249 decimal degrees 0.0001 Lat decimal degree latitude value in WGS 84 producer defined 36.82796 36.97551 decimal degrees 0.00001 utc_dt UTC time and date stamp Producer defined Date stamp in the format YYYY/MM/DD followed by the UTC time in HH:MM:SS format. surveyid Unique field activity identifier U.S Geological Survey 2021-619-FA is the USGS survey identifier. More info can be found at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-619-FA. vehicleid name of survey vessel Producer defined R/V Parke Snavely deviceid name of CTD device Producer defined SonTek CastAway-CTD The first 28 rows of the csv file contain specific information about the cast. The first column details the information type, and the second column is the value. The first column is listed below: > %Device > %File name > %Cast time (UTC) > %Cast time (local) > %Sample type > %Cast data > %Location source > %Default latitude > %Default altitude > %Start latitude > %Start longitude > %Start altitude > %Start GPS horizontal error (Meter) > %Start GPS vertical error (Meter) > %Start GPS number of satellites > %End latitude > %End longitude > %End altitude > %End GPS horizontal error (Meter) > %End GPS vertical error (Meter) > %End GPS number of satellites > %Cast duration (Seconds) > %Samples per second > %Electronics calibration date > %Conductivity calibration date > %Temperature calibration date > %Pressure calibration date > (blank) U.S. Geological Survey U.S. Geological Survey - CMGDS mailing and physical

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Cast data in csv format are contained in the zip file ‘2021-619-FA_RVPS_SoundVelCTD_csv.zip’. A multipoint shapefile of cast locations with cast information included as attributes is provided in the zip file ‘2021-619-FA_RVPS_SoundVelCTD_location_shapefile.zip’. ‘2021-619-FA_RVPS_SoundVelCTD_plots_png.zip’ is a zip file that contains the 9 plotted images of sound velocity (in meters per second) as a function of depth (in meters) for each cast location. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. comma-delimited text RFC 4180 Zip file contains the 9 SonTek CastAway csv tables. The zip file can be decompressed with any zip utility (for example, 7zip, Keka, WinZip). 0.0832 https://doi.org/10.5066/P9EHITBI Data (2021-619-FA_RVPS_SoundVelCTD_csv.zip) can be downloaded using the Network_Resource_Name link and scrolling to the Sound Velocity Data section. Shapefile Spatialite 5.0.1 Zip file contains the shapefile of cast location with all pertinent collection information included as attributes. The zip file can be decompressed with any zip utility (for example, 7zip, Keka, WinZip). 0.0018 https://doi.org/10.5066/P9EHITBI Data (2021-619-FA_RVPS_SoundVelCTD_location_shapefile.zip) can be downloaded using the Network_Resource_Name link and scrolling to the Sound Velocity Data section. PNG ImageMagick (version 7.0.8-11) Portable Network Graphic (PNG) Zip file contains the 9 PNG plots of the cast CSV data columns Depth (meters) and Sound Velocity (in meters per second) on the Y and X axes, respectively. The zip file can be decompressed with any zip utility (for example, 7zip, Keka, WinZip). 0.4937 https://doi.org/10.5066/P9EHITBI Data (2021-619-FA_RVPS_SoundVelCTD_plots_png.zip) can be downloaded using the Network_Resource_Name link and scrolling to the Sound Velocity Data section. None. CSV data can be viewed with any text editing or spreadsheet software. PNG images can be viewed with any image viewer software. Users must have software capable of reading shapefile (.shp) format to view location point information. 20230516 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998