Depth-integrated euphausiid (Family Euphausiidae) backscatter summary from echo integration-trawl survey of walleye pollock (Theragra chalcogramma) on the U.S. and Russian Bering Sea shelf in June, July, and August 2010

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Ressler, Patrick H.
Originator:
Midwater Assessment Program (MACE) of the Resource Assessment and Conservation Engineering Division (RACE) of the NOAA National Marine Fisheries Service Alaska Fisheries Science Center (AFSC)
Publication_Date: Unpublished material
Title:
Depth-integrated euphausiid (Family Euphausiidae) backscatter summary from echo integration-trawl survey of walleye pollock (Theragra chalcogramma) on the U.S. and Russian Bering Sea shelf in June, July, and August 2010
Geospatial_Data_Presentation_Form: digital
Description:
Abstract:
Midwater walleye pollock biomass is measured during annual or biennial acoustic-trawl surveys conducted by the Midwater Assessment and Conservation Engineering (MACE) Program, Resource Assessment and Conservation Engineering (RACE) Division, of the NOAA-NMFS Alaska Fisheries Science Center (AFSC). Acoustic backscatter from euphausiids (Family Euphausiidae, principally Thysanoessa inermis and T. raschii) is now also measured during these surveys. In 2010, the acoustic-trawl survey was conducted from 5 June to 7 August using the NOAA Ship Oscar Dyson. Acoustic backscatter at five acoustic frequencies (18, 38, 70, 120, and 200 kHz) was measured along north-south survey transects spaced at an east-west distance of 20 nautical miles (nmi); backscatter from euphausiids was classified by comparing the observed frequency response, characterized by pairwise frequency differences between 18, 38, 120, and 200 kHz, to a reference library of known catch composition and frequency response derived from previous surveys. Methot trawling was used to determine the species and length frequency composition of detected euphausiid aggregations; analyses of these catch composition data are still in preparation. The summary data set submitted here includes the nautical area scattering coefficient (sA, m2 nmi-2) for euphausiids between 16 m below the sea surface and 0.5 m above the seafloor in 0.5 nmi intervals (averaging distance along the survey transect). The latitude, longitude, and vessel log distance values represent the starting location for each interval along the transect. sA is proportional to biomass of euphausiids, but these data have not yet been scaled to biomass units. The multifrequency classification method is described further in De Robertis et al. (2010) and Ressler et al. (accepted). Further information and detail on the midwater pollock survey data can be found by consulting Honkelehto et al. (in prep.) or by contacting the author of this data set.
Purpose:
The purpose of the submitted data set is to provide a spatially explicit estimate of euphausiid backscatter for use according to the BEST-BSIERP data policy. Those with a need for more detail should contact the Author of the data set. These data come from a regular stock assessment survey of midwater walleye pollock in the eastern Bering Sea. The purpose is to characterize the abundance and distribution of euphausiids, and important prey of walleye pollock. The digital data file described here was created for submission to the BEST-BSIERP program database.
Supplemental_Information:
This data set as submitted to the database is unpublished. Use and citation of these data must conform to the BEST-BSIERP data policy (<http://www.eol.ucar.edu/projects/best/program_management_plan.pdf>) and standard scientific practice.
A manuscript describing these data by Ressler et al. was recently accepted to the journal Deep-Sea Research II:
Ressler, P.H., De Robertis, A., Warren, J.D., Smith, J.N., Kotwicki, S. Using an acoustic index of euphausiid abundance to understand trophic interactions in the Bering Sea ecosystem. Accepted, Deep-Sea Res. II
The following is a publication that describes the frequency classification method used:
De Robertis, A., D.R. McKelvey, and P.H. Ressler. 2010. Development and application of empirical multifrequency methods for backscatter classification in the North Pacific. Can. J. Fish. Aquat. Sci. 67: 1459–1474. The following is a publication about the data that describes the 2010 acoustic trawl survey:
Honkalehto, T., A. McCarthy, P. Ressler, K.Williams, and D. Jones. In preparation.
Results of the acoustic-trawl survey of walleye pollock (Theragra chalcogramma) on the U.S. and Russian Bering Sea shelf in June - August 2010 (DY1006). AFSC Processed Rep. xxxx, xx p. Alaska Fish. Sci. Cent., NOAA, Natl. Mar. Fish. Serv., 7600 Sand Point Way NE, Seattle WA 98115.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20100605
Ending_Date: 20100807
Currentness_Reference: Start and end dates of the survey
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Description_of_Geographic_Extent: Eastern Bering Sea Shelf
Bounding_Coordinates:
West_Bounding_Coordinate: -180.0
East_Bounding_Coordinate: -160.0
North_Bounding_Coordinate: 63.0
South_Bounding_Coordinate: 54.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: project_number:B62
Theme_Keyword: data_url:<http://data.eol.ucar.edu/codiac/dss/id=245.B62-005>
Theme_Keyword: archive_url:<http://www.eol.ucar.edu/projects/bsierp>
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Bering Sea
Place_Keyword: Alaska
Place_Keyword: AK
Taxonomy:
Keywords/Taxon:
Taxonomic_Keyword_Thesaurus: None
Taxonomic_Keywords: Euphausiids
Taxonomic_Keywords: Euphausiidae
Taxonomic_Keywords: Thysanoessa raschii
Taxonomic_Keywords: Thysanoessa inermis
Taxonomic_Classification:
Taxon_Rank_Name: Kingdom
Taxon_Rank_Value: Animalia
Taxonomic_Classification:
Taxon_Rank_Name: Phylum
Taxon_Rank_Value: Arthropoda
Taxonomic_Classification:
Taxon_Rank_Name: Subphylum
Taxon_Rank_Value: Crustacea
Taxonomic_Classification:
Taxon_Rank_Name: Class
Taxon_Rank_Value: Malacostraca
Taxonomic_Classification:
Taxon_Rank_Name: Subclass
Taxon_Rank_Value: Eumalacostraca
Taxonomic_Classification:
Taxon_Rank_Name: Superorder
Taxon_Rank_Value: Eucarida
Taxonomic_Classification:
Taxon_Rank_Name: Order
Taxon_Rank_Value: Euphausiacea
Taxonomic_Classification:
Taxon_Rank_Name: Family
Taxon_Rank_Value: Euphausiidae
Taxonomic_Classification:
Taxon_Rank_Name: Genus
Taxon_Rank_Value: Thysanoessa
Taxonomic_Classification:
Taxon_Rank_Name: Species
Taxon_Rank_Value: Thysanoessa raschii
Applicable_Common_Name: Euphausiids
Taxonomic_Classification:
Taxon_Rank_Name: Family
Taxon_Rank_Value: Euphausiidae
Taxonomic_Classification:
Taxon_Rank_Name: Genus
Taxon_Rank_Value: Thysanoessa
Taxonomic_Classification:
Taxon_Rank_Name: Species
Taxon_Rank_Value: Thysanoessa inermis
Applicable_Common_Name: Euphausiids
Access_Constraints: No restriction for accessing this dataset
Use_Constraints:
Must cite originator if used in publications, reports, presentations, etc.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Resource Assessment and Conservation Engineering Division Alaska Fisheries Science Center, National Marine Fisheries Service National Oceanic and Atmospheric Administration (NOAA)
Contact_Person: Patrick H. Ressler, Ph.D.
Contact_Address:
Address_Type: mailing and physical
Address: 7600 Sand Point Way NE
City: Seattle
State_or_Province: WA
Postal_Code: 98115
Country: USA
Contact_Voice_Telephone: 206-526-4785
Contact_Electronic_Mail_Address: Patrick.Ressler@noaa.gov

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The data are very reliable and have been checked many times for accuracy. It is likely that this dataset will eventually be revised and expressed as units of abundance (euphausiids m2) or biomass (C m2). Horizontal Positional Accuracy Report: Geographic position is determined using differential GPS. Vertical Positional Accuracy Report: These are depth-integrated measurements. Each datum is the nautical area scattering coefficient (sA, m2 nmi-2) for euphausiids between 16 m below the sea surface and 0.5 m above the seafloor within in 0.5 nmi intervals (averaging distance along the survey transect). The latitude, longitude, and vessel log distance values represent the starting location for each interval along the transect. sA is proportional to biomass of euphausiids, but these data have not yet been scaled to biomass units. Euphausiid backscatter is not estimated for some intervals of the pollock survey (see midwater pollock biomass data set referenced above by Ressler, accepted, Honkalehto et al, in prep.), such as the intervals immediately prior to and immediately following a pause and resume of a survey transect, or instances where multifrequency data was not collected due to equipment problems. For these intervals, the euphausiid backscatter value is NaN (no data).
Logical_Consistency_Report:
These data have been checked numerous times for data processing errors. Data and/or locations seem correct upon visual inspection when plotted on graphs/maps. The number of data (0.5 nmi intervals) is equal to the number of data in the midwater pollock data set referenced above (Ressler, unpublished).
Completeness_Report:
See the following references for survey data collection methodology: Honkalehto, T., A. McCarthy, P. Ressler, K.Williams, and D. Jones. In preparation.
Results of the acoustic-trawl survey of walleye pollock (Theragra chalcogramma) on the U.S. and Russian Bering Sea shelf in June - August 2010 (DY1006). AFSC Processed Rep. xxxx, xx p. Alaska Fish. Sci. Cent., NOAA, Natl. Mar. Fish. Serv., 7600 Sand Point Way NE, Seattle WA 98115.
Honkalehto, T., N. Williamson, and S. De Blois. 2002. Echo integration-trawl survey results for walleye pollock (Theragra chalcogramma) on the Bering Sea shelf and slope during the summer 1999. U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-125, 77 p. (.pdf, 5.74mb) URL: <http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-125.pdf> The following is a publication that describes the frequency classification method used:
De Robertis, A., D.R. McKelvey, and P.H. Ressler. 2010. Development and application of empirical multifrequency methods for backscatter classification in the North Pacific. Can. J. Fish. Aquat. Sci. 67: 1459–1474.
A manuscript describing the application of these methods for classifying euphausiids by Ressler et al. is now accepted to the journal Deep-Sea Research II:
Ressler, P.H., De Robertis, A., Warren, J.D., Smith, J.N., Kotwicki, S. Using an acoustic index of euphausiid abundance to understand trophic interactions in the Bering Sea ecosystem. Accepted, Deep-Sea Res. II
Lineage:
Process_Step:
Process_Description:
See a related dataset in this database, β€œDepth-integrated midwater pollock biomass summary from echo integration-trawl survey of walleye pollock (Theragra chalcogramma) on the U.S. and Russian Bering Sea shelf in June and July 2010” by Ressler, unpublished.
Process_Date: Unknown

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Depth-integrated midwater pollock biomass summary
Entity_Type_Definition:
Each datum is the nautical area scattering coefficient (sA, m2 nmi-2) for euphausiids between 16 m below the sea surface and 0.5 m above the seafloor in 0.5 nmi intervals (averaging distance along the survey transect). The latitude, longitude, and vessel log distance values represent the starting location for each interval along the transect. sA is proportional to biomass of euphausiids, but these data have not yet been scaled to biomass units.
Entity_Type_Definition_Source: Producer defined
Attribute:
Attribute_Label: Longitude
Attribute_Definition: missing or invalid values are indicated by 'NaN'
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -360
Range_Domain_Maximum: 0
Attribute_Units_of_Measure: degrees west of prime meridian (west is negative)
Attribute:
Attribute_Label: Latitude
Attribute_Definition: missing or invalid values are indicated by 'NaN'
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 90
Attribute_Units_of_Measure: degrees north of the equator
Attribute:
Attribute_Label: Euphausiid sA
Attribute_Definition: missing or invalid values are indicated by 'NaN'
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: +inf
Attribute_Units_of_Measure: nautical area scattering coefficient, m2 nmi-2
Attribute:
Attribute_Label: Vessel log number (distance along survey track)
Attribute_Definition: missing or invalid values are indicated by 'NaN'
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: +inf
Attribute_Units_of_Measure: nautical miles

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: National Center for Atmospheric Research
Contact_Person: Earth Observing Laboratory
Contact_Address:
Address_Type: mailing and physical
Address: 3450 Mitchell Lane
City: Boulder
State_or_Province: CO
Postal_Code: 80301
Country: USA
Contact_Voice_Telephone: 303-497-8154
Contact_Electronic_Mail_Address: codiac@ucar.edu
Contact_Electronic_Mail_Address: stott@ucar.edu
Distribution_Liability:
No warranty expressed or implied is made regarding the accuracy or utility of the data, nor shall the act of distribution constitute such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with the data. The NCAR and NPRB shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: CSV
File_Decompression_Technique: No compression applied
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://beringsea.eol.ucar.edu>
Fees: no fee

Metadata_Reference_Information:
Metadata_Date: 20061107
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: National Center for Atmospheric Research
Contact_Person: Earth Observing Laboratory
Contact_Address:
Address_Type: mailing and physical
Address: 3450 Mitchell Lane
City: Boulder
State_or_Province: CO
Postal_Code: 80301
Country: USA
Contact_Voice_Telephone: 303-497-8154
Contact_Electronic_Mail_Address: codiac@ucar.edu
Contact_Electronic_Mail_Address: stott@ucar.edu
Metadata_Standard_Name:
FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001.1-1999

This page is <http://www.eol.ucar.edu/projects/bsierp/docs/B62-Euphausiids_2010_metadata.html>
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