Sound velocity vs. depth plots and CTD cast data collected in April 2021 offshore Santa Cruz, California during USGS field activity 2021-619-FA

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Alicia F. Balster-Gee
Originator: Wayne E. Baldwin
Originator: Patrick E. Hart
Publication_Date: 20220920
Title:
Sound velocity vs. depth plots and CTD cast data collected in April 2021 offshore Santa Cruz, California during USGS field activity 2021-619-FA
Geospatial_Data_Presentation_Form: comma-delimited text
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9EHITBI
Publication_Information:
Publication_Place:
Pacific Coastal and Marine Science Center, Santa Cruz, California
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/P9EHITBI
Larger_Work_Citation:
Citation_Information:
Originator: Alicia F. Balster-Gee
Originator: Wayne E. Baldwin
Originator: Patrick E. Hart
Publication_Date: 2022
Title:
Calibrated marine sparker source amplitude decay versus offset offshore Santa Cruz, California
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9EHITBI
Publication_Information:
Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/P9EHITBI
Description:
Abstract:
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.
Purpose:
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.
Supplemental_Information:
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.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20210419
Ending_Date: 20210428
Currentness_Reference: ground condition at time data were collected
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.47431993
East_Bounding_Coordinate: -121.81507587
North_Bounding_Coordinate: 37.09648707
South_Bounding_Coordinate: 36.72920243
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:a26a06ce-7031-46fa-b717-52350cf93f7b
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: geoscientificInformation
Theme_Keyword: location
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Water Column Features
Theme_Keyword: Water-Quality Parameters
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: ocean sciences
Theme_Keyword: ocean salinity
Theme_Keyword: ocean temperature
Theme_Keyword: marine chemistry
Theme_Keyword: navigational data
Theme_Keyword: geospatial datasets
Theme_Keyword: profiles
Theme_Keyword: sound velocity
Theme_Keyword: ocean sciences
Theme_Keyword: navigational data
Theme_Keyword: marine geophysics
Theme:
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: data processing
Theme_Keyword: Global Positioning System (GPS) observations
Theme_Keyword: oceanographic observations
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: CMHRP
Theme_Keyword: Pacific Coastal and Marine Science Center
Theme_Keyword: PCMSC
Theme_Keyword: Woods Hole Coastal and Marine Sciences Center
Theme_Keyword: WHCMSC
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Pacific Ocean
Place_Keyword: State of California
Place_Keyword: Monterey Bay
Place_Keyword: Santa Cruz
Place:
Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS)
Place_Keyword: Monterey Canyon
Place_Keyword: Soquel Canyon
Access_Constraints: None
Use_Constraints:
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.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Person: PCMSC Science Data Coordinator
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: 2021-619-FA_SVcast_CC1624004_20210426_165412.png
Browse_Graphic_File_Description:
An example sound velocity profile plot image for cast CC1624004_20210426_165412 at the L50A depth site.
Browse_Graphic_File_Type: PNG
Data_Set_Credit:
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).
Native_Data_Set_Environment:
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).
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
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.
Logical_Consistency_Report:
All values fall within expected ranges of temperature, specific conductance, and depth. Data have been checked for duplication and omission.
Completeness_Report:
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.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
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.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
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.
Lineage:
Process_Step:
Process_Description:
SonTek CastAway-CTD ASCII csv data were downloaded at the end of each field day.
Process_Date: 20210428
Process_Step:
Process_Description:
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.
Process_Date: 20220304
Process_Step:
Process_Description:
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.
Process_Date: 20220304
Process_Step:
Process_Description:
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)
Process_Date: 20230516
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 9
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000001
Longitude_Resolution: 0.000001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257224
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: International Equation of State for sea water (EOS-80)
Altitude_Resolution: 0.01
Altitude_Distance_Units: meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2021-619-FA_RVPS_SoundVelCTD_csv.zip
Entity_Type_Definition:
zip file containing 9 CTD cast csv data files. First 28 rows of each csv file contain information about the cast sample.
Entity_Type_Definition_Source: Producer defined
Attribute:
Attribute_Label: Pressure (Decibar)
Attribute_Definition: pressure readings at each sample point measured in decibars.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.15
Range_Domain_Maximum: 66.85334587
Attribute_Units_of_Measure: Decibar
Attribute_Measurement_Resolution: 0.00000001
Attribute:
Attribute_Label: Depth (Meter)
Attribute_Definition:
depth readings at each sample point measured in meters below sea level.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.149193091
Range_Domain_Maximum: 66.46995328
Attribute_Units_of_Measure: meters below sea level
Attribute_Measurement_Resolution: 0.00000001
Attribute:
Attribute_Label: Temperature (Celsius)
Attribute_Definition:
water temperature readings at each sample point measured in Celsius.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 9.035969143
Range_Domain_Maximum: 11.13141155
Attribute_Units_of_Measure: celsius
Attribute_Measurement_Resolution: 0.00000001
Attribute:
Attribute_Label: Conductivity (MicroSiemens per Centimeter)
Attribute_Definition:
conductivity readings at each sample point measured in MicroSiemens per centimeter.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 36412.66021
Range_Domain_Maximum: 38231.92969
Attribute_Units_of_Measure: MicroSiemens per centimeter
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: Salinity (Practical Salinity Scale)
Attribute_Definition:
salinity readings at each sample point measured in practical salinity scale.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 33.95811296
Range_Domain_Maximum: 34.2389649
Attribute_Units_of_Measure: Practical Salinity scale
Attribute_Measurement_Resolution: 0.0000001
Attribute:
Attribute_Label: Sound Velocity (Meters per Second)
Attribute_Definition:
sound velocity readings at each sample point measured in meters per second.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1486.249233
Range_Domain_Maximum: 1492.713653
Attribute_Units_of_Measure: meters per second
Attribute_Measurement_Resolution: 0.000001
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2021-619-FA_RVPS_SoundVelCTD_plots_png.zip
Entity_Type_Definition:
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.
Entity_Type_Definition_Source: U.S. Geological Survey
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2021-619-FA_RVPS_SoundVelCTD_location_shapefile.zip
Entity_Type_Definition:
zip file contains a shapefile of CTD cast locations and acquisition information
Entity_Type_Definition_Source: U.S. Geological Survey
Attribute:
Attribute_Label: cast
Attribute_Definition: Name of velocity profile used to distinguish between casts.
Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:
Unrepresentable_Domain:
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.
Attribute:
Attribute_Label: castimage
Attribute_Definition:
Name of the Sound Velocity profile plot image. Names are the same as the cast identifier with the .png file extension.
Attribute_Definition_Source: Producer defined.
Attribute_Domain_Values:
Unrepresentable_Domain:
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.
Attribute:
Attribute_Label: Lon
Attribute_Definition: decimal degree longitude value in WGS 84
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -122.3334
Range_Domain_Maximum: -121.9249
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: Lat
Attribute_Definition: decimal degree latitude value in WGS 84
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 36.82796
Range_Domain_Maximum: 36.97551
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: utc_dt
Attribute_Definition: UTC time and date stamp
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Date stamp in the format YYYY/MM/DD followed by the UTC time in HH:MM:SS format.
Attribute:
Attribute_Label: surveyid
Attribute_Definition: Unique field activity identifier
Attribute_Definition_Source: U.S Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain:
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.
Attribute:
Attribute_Label: vehicleid
Attribute_Definition: name of survey vessel
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Unrepresentable_Domain: R/V Parke Snavely
Attribute:
Attribute_Label: deviceid
Attribute_Definition: name of CTD device
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Unrepresentable_Domain: SonTek CastAway-CTD
Overview_Description:
Entity_and_Attribute_Overview:
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)
Entity_and_Attribute_Detail_Citation: U.S. Geological Survey
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - CMGDS
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Resource_Description:
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.
Distribution_Liability:
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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: comma-delimited text
Format_Version_Number: RFC 4180
Format_Information_Content: Zip file contains the 9 SonTek CastAway csv tables.
File_Decompression_Technique:
The zip file can be decompressed with any zip utility (for example, 7zip, Keka, WinZip).
Transfer_Size: 0.0832
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/P9EHITBI
Access_Instructions:
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.
Digital_Form:
Digital_Transfer_Information:
Format_Name: Shapefile
Format_Version_Number: Spatialite 5.0.1
Format_Information_Content:
Zip file contains the shapefile of cast location with all pertinent collection information included as attributes.
File_Decompression_Technique:
The zip file can be decompressed with any zip utility (for example, 7zip, Keka, WinZip).
Transfer_Size: 0.0018
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/P9EHITBI
Access_Instructions:
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.
Digital_Form:
Digital_Transfer_Information:
Format_Name: PNG
Format_Version_Number: ImageMagick (version 7.0.8-11)
Format_Specification: Portable Network Graphic (PNG)
Format_Information_Content:
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.
File_Decompression_Technique:
The zip file can be decompressed with any zip utility (for example, 7zip, Keka, WinZip).
Transfer_Size: 0.4937
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/P9EHITBI
Access_Instructions:
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.
Fees: None.
Technical_Prerequisites:
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.
Metadata_Reference_Information:
Metadata_Date: 20230516
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Person: PCMSC Science Data Coordinator
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
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