Hydroacoustic Survey Data from Prince William Sound, Alaska

Identification_Information:

Citation:

Citation_Information:

Originator: Arimitsu, Mayumi L. (ORCID: 0000-0001-6982-2238)
Originator: Piatt, John F. (ORCID: 0000-0002-4417-5748)
Originator: Heflin, Brielle H. (ORCID: 0000-0002-4836-9187)
Originator: Marsteller, Caitlin E. (ORCID: 0000-0002-2430-0708)
Publication_Date: 2017
Title: Hydroacoustic Survey Data from Prince William Sound, Alaska
Geospatial_Data_Presentation_Form: tabular digital data
Series_Information:

Series_Name:

Gulf Watch Alaska - Pelagic Ecosystems Forage Fish Component - Data from Prince William Sound: Distribution, Abundance, and Morphology of Fish, Zooplankton, and Predators and Oceanographic Conditions

Issue_Identification: ver 3.0, March 2023

Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center

Other_Citation_Details:

Suggested Citation: Arimitsu, M.L., Piatt, J.F., Heflin, B.M., Marsteller, C.E. 2017. Gulf Watch Alaska - Pelagic Ecosystems Forage Fish Component - data from Prince William Sound: distribution, abundance, and morphology of fish, zooplankton, and predators and oceanographic Conditions (ver 3.0, March 2023): U.S. Geological Survey data release, https://doi.org/10.5066/F74J0C9Z

Online_Linkage: https://doi.org/10.5066/F74J0C9Z
Larger_Work_Citation:

Citation_Information:

Originator: U.S. Geological Survey, Alaska Science Center
Publication_Date: 2002
Title: Seabird and Forage Fish Ecology Program
Geospatial_Data_Presentation_Form: website
Series_Information:

Series_Name: Alaska Science Portal
Issue_Identification: 11

Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center

Other_Citation_Details:

This is a link to the broader USGS Alaska Science Center research project supported by these data. Users will find a description of the research project and links to associated reports, publications, and data products.

Online_Linkage: https://alaska.usgs.gov/portal/project.php?project_id=11

Description:

Abstract:

These data are part of the Gulf Watch Alaska (GWA) long term monitoring program, pelagic monitoring component. This datasets consist of multiple tables (one for each sample station and frequency), providing echointegration data from forage fish survey transects in Prince William Sound, Alaska. Each file contains analysis exports from EchoView Software Pty Ltd. ver. 7.1.29.30212.

Purpose:

Common forage species of Prince William Sound, for example capelin (Mallotus catervarius), Pacific sand lance (Ammodytes personatus), juvenile walleye pollock (Gadus chalcogrammus), eulachon (Thaleichthys pacificus), Pacific herring (Clupea pallasii) and euphausiids (Euphausiacea), are important to marine food webs because they link primary and secondary producers with higher trophic levels. The purpose of this data collection effort was to measure hydroacoustic backscatter as an index of biomass in the water column.

Supplemental_Information:

This project is a component of the Exxon Valdez Oil Spill Trustee Council’s integrated, multi-project program known as Gulf Watch Alaska (Long-term Monitoring of Marine Conditions and Injured Resources and Services). To detect changes in populations of forage fish in Prince William Sound (PWS), we gathered data on the distribution, abundance, community structure, habitat, and body condition of key species in PWS.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 2014
Ending_Date: 2021

Currentness_Reference: observed

Status:

Progress: Planned
Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Description_of_Geographic_Extent: Prince William Sound, Alaska
Bounding_Coordinates:

West_Bounding_Coordinate: -148.249
East_Bounding_Coordinate: -146.499
North_Bounding_Coordinate: 61.083
South_Bounding_Coordinate: 60.038

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ASC102

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: Biota
Theme_Keyword: Oceans
Theme_Keyword: Environment

Theme:

Theme_Keyword_Thesaurus: NASA GCMD Earth Science Keyword Thesaurus
Theme_Keyword: Fisheries
Theme_Keyword: Zooplankton
Theme_Keyword: Pelagic habitat

Theme:

Theme_Keyword_Thesaurus: USGS CSA Biocomplexity Thesaurus
Theme_Keyword: Fishery technology
Theme_Keyword: Aquatic Sciences and Fisheries
Theme_Keyword: Marine fisheries

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: Coastal ecosystems
Theme_Keyword: Marine ecosystems
Theme_Keyword: Marine fishery resources

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: Hydroacoustics
Theme_Keyword: Acoustic backscatter
Theme_Keyword: Nautical area scattering coefficient

Place:

Place_Keyword_Thesaurus: USGS Geographic Names Information System (GNIS)
Place_Keyword: Alaska
Place_Keyword: Gulf of Alaska
Place_Keyword: Prince William Sound

Access_Constraints: None
Use_Constraints:

It is requested that the authors and the USGS Alaska Science Center be cited for any subsequent publications that reference this dataset.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, Alaska Science Center

Contact_Address:

Address_Type: Mailing and Physical
Address: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Country: USA

Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov

Data_Set_Credit:

Funding was provided by the Exxon Valdez Oil Spill Trustee Council and U.S. Geological Survey, Alaska Science Center.

Native_Data_Set_Environment:

The original data is stored as text files and is also made available in this format for dissemination.

Cross_Reference:

Citation_Information:

Originator: Arimitsu, M.L.
Originator: Piatt, J.F.
Originator: Heflin, B.
Originator: Schoen, S.K.
Originator: von Biela, V.R.
Publication_Date: 2018
Title:

Monitoring long-term changes in forage fish distribution, abundance and body condition

Geospatial_Data_Presentation_Form: document
Series_Information:

Series_Name:

Exxon Valdez Oil Spill Long-term Monitoring Program (Gulf Watch Alaska)

Issue_Identification:

Final Report (Exxon Valdez Oil Spill Trustee Council Project 16120114-O)

Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: Exxon Valdez Oil Spill Trustee Council, Anchorage, Alaska

Other_Citation_Details:

Arimitsu, M.L., Piatt, J.F., Heflin, B., Schoen, S.K., von Biela, V.R. 2018. Monitoring long-term changes in forage fish distribution, abundance and body condition. Exxon Valdez Oil Spill Long-term Monitoring Program (Gulf Watch Alaska) Final Report (Exxon Valdez Oil Spill Trustee Council Project 16120114-O). Exxon Valdez Oil Spill Trustee Council, Anchorage, Alaska.

Unpublished report archived by the Alaska Resources Library and Information Services (ARLIS) https://www.arlis.org [reference code: ILS:5083203]

Online_Linkage: https://www.arlis.org/docs/vol1/EVOS/2018/16120114-O.pdf

Cross_Reference:

Citation_Information:

Originator: von Biela, V.R.
Originator: Arimitsu, M.L.
Originator: Piatt, J.F.
Originator: Heflin, B.
Originator: Schoen, S.K.
Originator: Trowbridge, J.L.
Originator: Clawson, C.M.
Publication_Date: 2019
Title:

Extreme reduction in nutritional value of a key forage fish during the Pacific marine heatwave of 2014-2016

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Marine Ecology Progress Series
Issue_Identification: 613:171–182

Publication_Information:

Publication_Place: online
Publisher: Inter-Research

Other_Citation_Details:

von Biela, V.R., M.L. Arimitsu, J.F. Piatt, B. Heflin, S.K. Schoen, J.L. Trowbridge, C.M. Clawson. 2019. Extreme reduction in the nutritional value of a key forage fish during the Pacific marine heatwave of 2014–2016. Marine Ecology Progress Series 613:171–182 doi:10.3354/meps12891

Online_Linkage: https://doi.org/10.3354/meps12891

Cross_Reference:

Citation_Information:

Originator: Arimitsu, M.L.
Originator: Piatt, J.F.
Originator: Hatch, S.A.
Originator: Suryan, R.M.
Originator: Batten, S.D.
Originator: Bishop, M.A.
Originator: Campbell, R.W.
Originator: Coletti, H.A.
Originator: Cushing, D.A.
Originator: Gorman, K.
Originator: Hopcroft, R.R.
Originator: Kuletz, K.J.
Originator: Marsteller, C.E.
Originator: McKinstry, C.A.E.
Originator: McGowan, D.
Originator: Moran, J.R.
Originator: Pegau, W.S.
Originator: Schaefer, A.
Originator: Schoen, S.K.
Originator: Straley, J.M.
Originator: von Biela, V.R.
Publication_Date: 2021
Title:

Heatwave-induced collapse of forage fish portfolio disrupts energy flow to top pelagic predators

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Global Change Biology
Issue_Identification: 27(9):1859-1878

Publication_Information:

Publication_Place: online
Publisher: Wiley

Other_Citation_Details:

Arimitsu, M.L., Piatt, J.F., Hatch, S.A., Suryan, R.M., Batten, S.D., Bishop, M.A., Campbell, R.W., Coletti, H.A., Cushing, D.A., Gorman, K., Hopcroft, R.R., Kuletz, K.J., Marsteller, C.E., McKinstry, C.A.E., McGowan, D., Moran, J.R., Pegau, W.S., Schaefer, A., Schoen, S.K., Straley, J.M., von Biela, V.R. 2021. Heatwave-induced collapse of forage fish portfolio disrupts energy flow to top pelagic predators. Global Change Biology 27(9):1859-1878 doi:10.1111/gcb.15556

Online_Linkage: https://doi.org/10.1111/gcb.15556

Cross_Reference:

Citation_Information:

Originator: Suryan, R.M.
Originator: Arimitsu, M.L.
Originator: Coletti, H.A.
Originator: Hopcroft, R.R.
Originator: Lindeberg, M.R.
Originator: Barbeaux, S.J.
Originator: Batten, S.D.
Originator: Burt, W.J.
Originator: Bishop, M.A.
Originator: Bodkin, J.L.
Originator: Brenner, R.E.
Originator: Campbell, R.W.
Originator: Cushing, D.A.
Originator: Danielson, S.L.
Originator: Dorn, M.W.
Originator: Drummond, B.
Originator: Esler, D.
Originator: Gelatt, T.
Originator: Hanselman, D.H.
Originator: Hatch, S.A.
Originator: Haught, S.
Originator: Holderied, K.
Originator: Iken, K.
Originator: Iron, D.B.
Originator: Kettle, A.B.
Originator: Kimmel, D.G.
Originator: Konar, B.
Originator: Kuletz, K.J.
Originator: Laurel, B.J.
Originator: Maniscalco, J.M.
Originator: Matkin, C.
Originator: McKinstry, C.A.E.
Originator: Monson, D.H.
Originator: Moran, J.R.
Originator: Olsen, D.
Originator: Palsson, W.A.
Originator: Pegau, W.S.
Originator: Piatt, J.F.
Originator: Rogers, L.A.
Originator: Rojek, N.A.
Originator: Schaefer, A.
Originator: Spies, I.B.
Originator: Straley, J.M.
Originator: Strom, S.L.
Originator: Sweeney, K.L.
Originator: Szymkowiak, M.
Originator: Weitzman, B.P.
Originator: Yasumiishi, E.M.
Originator: Zador, S.G.
Publication_Date: 2021
Title: Ecosystem response persists after a prolonged marine heatwave
Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Scientific Reports
Issue_Identification: 11:6235

Publication_Information:

Publication_Place: online
Publisher: Nature Portfolio

Other_Citation_Details:

Suryan, R.M., Arimitsu, M.L., Coletti, H.A., Hopcroft, R.R., Lindeberg, M.R., Barbeaux, S.J., Batten, S.D., Burt, W.J., Bishop, M.A., Bodkin, J.L., Brenner, R.E., Campbell, R.W., Cushing, D.A., Danielson, S.L., Dorn, M.W., Drummond, B., Esler, D., Gelatt, T., Hanselman, D.H., Hatch, S.A., Haught, S., Holderied, K., Iken, K., Iron, D.B., Kettle, A.B., Kimmel, D.G., Konar, B., Kuletz, K.J., Laurel, B.J., Maniscalco, J.M., Matkin, C., McKinstry, C.A.E., Monson, D.H., Moran, J.R., Olsen, D., Palsson, W.A., Pegau, W.S., Piatt, J.F., Rogers, L.A., Rojek, N.A., Schaefer, A., Spies, I.B., Straley, J.M., Strom, S.L., Sweeney, K.L., Szymkowiak, M., Weitzman, B.P., Yasumiishi, E.M., Zador, S.G. 2021. Ecosystem response persists after a prolonged marine heatwave. Scientific Reports 11:6235 doi:10.1038/s41598-021-83818-5

Online_Linkage: https://doi.org/10.1038/s41598-021-83818-5

Cross_Reference:

Citation_Information:

Originator: Arimitsu, M.L.
Originator: Piatt, J.F.
Originator: Hatch, S.A.
Originator: Suryan, R.M.
Originator: Batten, S.
Originator: Bishop, M.A.
Originator: Campbell, R.W.
Originator: Coletti, H.
Originator: Cushing, D.
Originator: Gorman, K.
Originator: Haught, S.
Originator: Hopcroft, R.R.
Originator: Kuletz, K.J.
Originator: Marsteller, C.E.
Originator: McKinstry, C.
Originator: McGowan, D.
Originator: Moran, J.
Originator: Pegau, W.S.
Originator: Schaefer, A.
Originator: Schoen, S.K.
Originator: Straley, J.
Originator: von Biela, V.R.
Publication_Date: 2021
Title:

Reduced Quality and Synchronous Collapse of Forage Species Disrupts Trophic Transfer During a Prolonged Marine Heatwave

Geospatial_Data_Presentation_Form: book chapter
Series_Information:

Series_Name:

Long-Term Monitoring Program (Gulf Watch Alaska) Synthesis Report

Issue_Identification: Chapter 3

Publication_Information:

Publication_Place: online
Publisher: Gulf Watch Alaska

Other_Citation_Details:

Arimitsu, M., Piatt, J.F., Hatch, S.A., Suryan, R.M., Batten, S., Bishop, M.A., Campbell, R.W., Coletti, H., Cushing, D., Gorman, K., Haught, S., Hopcroft, R.R., Kuletz, K.J., Marsteller, C.E., McKinstry, C., McGowan, D., Moran, J., Pegau, W.S., Schaefer, A., Schoen, S.K., Straley, J., von Biela, V.R. 2021. Reduced quality and synchronous collapse of forage species disrupts trophic transfer during a prolonged marine heatwave.

In: Suryan, R. M., M. R. Lindeberg, and D. R. Aderhold (eds) The Pacific Marine Heatwave: Monitoring During a Major Perturbation in the Gulf of Alaska. Long-Term Monitoring Program (Gulf Watch Alaska) Synthesis Report, (Exxon Valdez Oil Spill Trustee Council Program 19120114). Exxon Valdez Oil Spill Trustee Council, Anchorage, Alaska

Online_Linkage: https://pubs.er.usgs.gov/publication/70220895

Analytical_Tool:

Analytical_Tool_Description:

Split beam dual frequency hydroacoustic system (Simrad® EK60) operating at 38 (12° beam width) and 120 (7° beam width) kHz frequencies.

Tool_Access_Information:

Tool_Access_Instructions: https://www.echoview.com/

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Hydroacoustics were calibrated each year before surveys were conducted. Data is processed in EchoView ver. 7.1.29.30212.

Logical_Consistency_Report:

Attribute values fall within expected ranges. Blank cells indicate data that were not collected or are not provided.

Completeness_Report:

These data were collected in different locations and different years, the dataset is complete, any variation in equipment or methods amongst years/location are noted.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Latitude and longitude were obtained from commercially available Garmin GPS units, accuracy estimated to be within 4 m.

Lineage:

Methodology:

Methodology_Type: Field
Methodology_Description:

Hydroacoustic data were obtained from a hull-mounted SIMRAD ER60 split beam dual frequency echosounder operating at 120 and 38 kHz. Tranducers were calibrated at the start of each survey following Foote et al. (1987). Raw data were collected to a maximum depth of 500 m at 0.512 ms transmitted pulse length.

Methodology:

Methodology_Type: Field
Methodology_Description:

Latitude and longitude point locations were recorded continuously during transects using SIMRAD ER60 ver.2.4.3.

Methodology:

Methodology_Type: Lab
Methodology_Description:

Sounder-detected bottom line were edited by visually inspecting the 38 kHz echogram. Passive noise was removed from both transducers using a data generator for each frequency following Parker-Stetter et al. 2009, and background noise was removed from the 120 kHz transducer following De Robertis and Higginbottom (2007). Any data below the bottom line and above 4 m from the surface were excluded from the integration export.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Foote, K.G.
Originator: Knudsen, H.P.
Originator: Vestnes, G.
Originator: MacLennan, D.N.
Originator: Simmonds, E.J.
Publication_Date: 1987
Title:

Calibration of acoustic instruments for fish density estimation: A practical guide

Geospatial_Data_Presentation_Form: document
Series_Information:

Series_Name: ICES Cooperative Research Report
Issue_Identification: 144

Publication_Information:

Publication_Place: Copenhagen, Denmark
Publisher: International Council for the Exploration of the Sea

Other_Citation_Details:

Foote, K.G., Knudsen, H.P., Vestnes, G., MacLennan, D.N., Simmonds, E.J. 1987. Calibration of acoustic instruments for fish density estimation: A practical guide. ICES Cooperative Research Report no.144 63pp

Type_of_Source_Media: publication
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1987

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Foote et al 1987
Source_Contribution: Decsribes calibrations

Source_Information:

Source_Citation:

Citation_Information:

Originator: Parker-Stetter, S.L.
Originator: Rudstam, L.G.
Originator: Sullivan, P.J.
Originator: Warner, D.M.
Publication_Date: 2009
Title:

Standard Operating Procedures for Fisheries Acoustic Surveys in the Great Lakes

Geospatial_Data_Presentation_Form: document
Series_Information:

Series_Name: Great Lakes Fishery Commission, Special Publication
Issue_Identification: 09-01

Publication_Information:

Publication_Place: Ann Arbor, MI
Publisher: Great Lakes Fishery Commission

Other_Citation_Details:

Parker-Stetter, Sandra L., Rudstam, L.G., Sullivan, P.J., Warner, D.M. 2009. Standard Operating Procedures for Fisheries Acoustic Surveys in the Great Lakes. Great Lakes Fishery Commission, Special Publication 09-01

Online_Linkage: http://www.glfc.org/pubs/SpecialPubs/Sp09_1.pdf

Type_of_Source_Media: publication
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2009

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Parker-Stetter et al 2009
Source_Contribution: Describes data processing

Source_Information:

Source_Citation:

Citation_Information:

Originator: De Robertis, A.
Originator: Higginbottom, I.
Publication_Date: 2007
Title:

A post-processing technique to estimate the signal-to-noise ratio and remove echosounder background noise

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: ICES Journal of Marine Science
Issue_Identification: 64(6):1282-1291

Publication_Information:

Publication_Place: online
Publisher: ICES Journal of Marine Science

Other_Citation_Details:

De Robertis, A., Higginbottom, I. 2007. A post-processing technique to estimate the signal-to-noise ratio and remove echosounder background noise. ICES Journal of Marine Science 64(6):1282-1291 doi:10.1093/icesjms/fsm112

Online_Linkage: https://doi.org/10.1093/icesjms/fsm112

Type_of_Source_Media: publication
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2009

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: De Robertis and Higginbottom 2007
Source_Contribution: Describes data processing

Process_Step:

Process_Description:

No additonal process steps have been described for this data set.

Process_Date: Unknown

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0001
Longitude_Resolution: 0.0001
Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: World Geodetic System of 1984
Ellipsoid_Name: World Geodetic System of 1984
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257223563

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: hydroacoustic_survey_princeWilliamSound
Entity_Type_Definition:

Folder (and subfolders) with hydroacoustic from a hull-mounted SIMRAD ER60 split beam dual frequency echosounder. Folders are organized by frequency (120kHz and 38kHz) and sampling year. Each data file is named with its station ID. Presented in a Comma Separated Value (CSV) formatted table.

Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: Process_ID
Attribute_Definition: ID used in processing data
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: text field

Attribute:

Attribute_Label: Interval
Attribute_Definition:

Reports the interval number of the cell being analyzed, division on the time/distance axis of a grid, i.e. intervals are delineated by vertical bands on an echogram.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: number field

Attribute:

Attribute_Label: Layer
Attribute_Definition:

Reports the layer number of the cell being analyzed, division on the depth/range axis of a grid, i.e. layers are delineated by horizontal bands on an echogram.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: number field

Attribute:

Attribute_Label: Sv_mean
Attribute_Definition:

Sv_mean = mean volume backscattering strength of the domain being integrated (dB re 1 m²/m³). -999 indicates unusable data.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -999
Range_Domain_Maximum: 21.12527
Attribute_Units_of_Measure: (dB re 1 m²/m³)

Attribute:

Attribute_Label: NASC
Attribute_Definition:

Nautical area scattering coefficient - 4π = Steradians in a sphere - converting "backscattering" cross-section to "scattering" cross-section, 1852 = meters per nautical mile (m/nmi)), Sv = mean volume backscattering strength of the domain being integrated (dB re 1 m²/m³), T= mean thickness of the domain being integrated. NASC=4π×〖1852〗^2×〖10〗^(Sv/10)×T, NASC=4π×〖1852〗^2×〖10〗^((Sv_mean)/10)×Thickness_mean

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -9999
Range_Domain_Maximum: 5323768111
Attribute_Units_of_Measure: m²/nmi²

Attribute:

Attribute_Label: Sv_max
Attribute_Definition:

Sv_max = maximum Sv in the domain which was analyzed (dB re 1m¯¹). -999 indicates unusable data.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -999
Range_Domain_Maximum: -27.17
Attribute_Units_of_Measure: (dB re 1m¯¹)

Attribute:

Attribute_Label: Height_mean
Attribute_Definition:

Reports the mean height of the domain which was analyzed (meters). The projection of thickness_mean onto the vertical axis taking transducer geometry into account.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 1.054529
Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: Depth_mean
Attribute_Definition: Reports the mean depth of the domain which was analyzed
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 499.519
Attribute_Units_of_Measure: mean depth meters

Attribute:

Attribute_Label: Layer_depth_min
Attribute_Definition:

Reports the minimum depth of the cell/layer which was analyzed (meters)

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -1
Range_Domain_Maximum: 499
Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: Layer_depth_max
Attribute_Definition:

Reports the maximum depth of the cell/layer which was analyzed (meters)

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 500.0
Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: Ping_S
Attribute_Definition:

Reports the number of the first ping in the domain which was analyzed (S for Start)

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 24180
Attribute_Units_of_Measure: start ping number for interval being analyzed

Attribute:

Attribute_Label: Ping_E
Attribute_Definition:

Reports the number of the last ping in the domain which was analyzed (E for End)

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 4
Range_Domain_Maximum: 24182
Attribute_Units_of_Measure: end ping number for interval being analyzed

Attribute:

Attribute_Label: Dist_M
Attribute_Definition:

Reports the distance (measured by GPS) from the first ping in the analyzed variable to the middle ping in the domain which was analyzed (M for Middle).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -2.083
Range_Domain_Maximum: 112347.2
Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: Date_M
Attribute_Definition:

Reports the date of the middle ping in the domain which was analyzed (M for middle).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 20140713
Range_Domain_Maximum: 20210922
Attribute_Units_of_Measure: date, YYYYMMDD

Attribute:

Attribute_Label: Time_M
Attribute_Definition:

Reports the time (UTC) of the middle ping in the domain which was analyzed (M for middle).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 00:00:04.0080
Range_Domain_Maximum: 23:59:59.6020
Attribute_Units_of_Measure: hh:mm:ss.ssss

Attribute:

Attribute_Label: Lat_M
Attribute_Definition:

Reports the latitude (in decimal degrees) of the middle ping in the domain which was analyzed (M for Middle).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 59.81
Range_Domain_Maximum: 61.08321
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: Lon_M
Attribute_Definition:

Reports the longitude (in decimal degrees) of the middle ping in the domain which was analyzed (M for Middle).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -148.1
Range_Domain_Maximum: -146.2
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: Standard_deviation
Attribute_Definition:

Reports the standard deviation of all sample values in the domain which was analyzed. This is calculated in the linear domain (not the dB domain).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 2.853e-03
Attribute_Units_of_Measure: number

Attribute:

Attribute_Label: ABC
Attribute_Definition:

Area Backscattering Coefficient - Sv = mean volume backscattering strength of the domain being integrated (dB re 1 m²/m³), T= mean thickness of the domain being integrated. ABC=〖10〗^(Sv/10)×Τ, ABC=〖10〗^((Sv_mean)/10)× Thickness_mean

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 1.961e-03
Attribute_Units_of_Measure: m²/m²

Attribute:

Attribute_Label: Thickness_mean
Attribute_Definition: mean thickness of the domain which (meters)
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.01912
Range_Domain_Maximum: 1.05358
Attribute_Units_of_Measure: meters

Hydroacoustic Survey Data from Prince William Sound, Alaska

Metadata: