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 and July 2008

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Ressler, P.H.
Publication_Date: Unpublished material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 and July 2008
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 2008, the acoustic-trawl survey was conducted from 2 June to 31 July 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. (submitted). Further information and detail on the midwater pollock survey data can be found by consulting Honkelehto et al. (2009) 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. 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. Those with a need for more detail should contact the Author of the data set.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20080602
Ending_Date: 20080731
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Unspecified
Spatial_Domain:
Description_of_Geographic_Extent: Eastern Bering Sea shelf
Bounding_Coordinates:
West_Bounding_Coordinate: -180.00000
East_Bounding_Coordinate: -160.00000
North_Bounding_Coordinate: 63.00000
South_Bounding_Coordinate: 54.00000
Keywords:
Theme:
Theme_Keyword_Thesaurus: IOOS Core Variables
Theme_Keyword: Version 1
Theme_Keyword: Zooplankton abundance
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: project_number:B62
Theme_Keyword: data_url:<http://data.eol.ucar.edu/codiac/dss/id=245.B62-003>
Theme_Keyword: archive_url:<http://www.eol.ucar.edu/projects/bsierp>
Access_Constraints:
Access is restricted. Data policy: <http://www.eol.ucar.edu/projects/best/program_management_plan.pdf>
Use_Constraints:
Use is restricted. Data policy: <http://www.eol.ucar.edu/projects/best/program_management_plan.pdf>
Browse_Graphic:
Browse_Graphic_File_Name: euphausiid_2008.gif
Browse_Graphic_File_Description: Map of depth-integrated euphausiid abundance, 2008
Browse_Graphic_File_Type: GIF
Data_Set_Credit:
These data came from a survey conducted by the 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). A citation of the NOAA Technical Memorandum describing the survey data collection, analysis, and results is as follows: HONKALEHTO, T., N. WILLIAMSON, D. JONES, A. McCARTHY, and D. McKELVEY. 2009. Results of the echo integration-trawl survey of walleye pollock (Theragra chalcogramma) on the U.S. and Russian Bering Sea shelf in June and July 2008. U. S. Dep. Commer., NOAA Tech. Memo., NMFS-AFSC-194, 56 p. (.pdf, 2 MB). URL:<http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-194.pdf>
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). 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). sA is proportional to biomass of euphausiids, but these data have not yet been scaled to biomass units.
Logical_Consistency_Report:
These data have been check 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:
Euphausiid backscatter is not estimated for some intervals of the pollock survey (see midwater pollock biomass data set referenced above by Ressler, unpublished, Honkalehto et al, 2009), 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).
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Geographic position is determined using differential GPS. The latitude, longitude, and vessel log distance values represent the starting location for each interval along the transect.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
These are depth-integrated measurements, between 16 m below the sea surface and 3 m above the seafloor.
Lineage:
Methodology:
Methodology_Type: Lab
Methodology_Description: Frequency classification method used.
Methodology_Citation:
Citation_Information:
Originator: De Robertis, A.; McKelvey, D.R.; Ressler, P.H.
Publication_Date: Unpublished material
Title:
Development and application of empirical multifrequency methods for backscatter classification in the North Pacific
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Canadian Journal of Fisheries and Aquatic Sciences
Issue_Identification: submitted
Other_Citation_Details:
Publication that describes the frequency classification method used.
Methodology:
Methodology_Type: Field
Methodology_Description: Survey data collection methodology.
Methodology_Citation:
Citation_Information:
Originator:
HONKALEHTO, T., N. WILLIAMSON, D. JONES, A. McCARTHY, and D. McKELVEY
Publication_Date: 2009
Title:
Results of the echo integration-trawl survey of walleye pollock (Theragra chalcogramma) on the U.S. and Russian Bering Sea shelf in June and July 2008
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: NOAA Tech. Memo
Issue_Identification: NMFS-AFSC-194
Other_Citation_Details: Survey data collection methodology.
Online_Linkage:
<http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-194.pdf>
Methodology_Citation:
Citation_Information:
Originator: HONKALEHTO, T., N. WILLIAMSON, and S. De BLOIS
Publication_Date: 2002
Title:
Echo integration-trawl survey results for walleye pollock (Theragra chalcogramma) on the Bering Sea shelf and slope during the summer 1999
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: NOAA Tech. Memo.
Issue_Identification: NMFS-AFSC-125
Other_Citation_Details: Survey data collection methodology.
Online_Linkage:
<http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-125.pdf>
Source_Information:
Source_Citation:
Citation_Information:
Originator: Ressler, P.H.
Publication_Date: Unpublished material
Title:
Depth-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 2008
Geospatial_Data_Presentation_Form: document
Type_of_Source_Media: draft article
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 200806
Ending_Date: 200807
Source_Currentness_Reference: Unspecified
Source_Citation_Abbreviation: Unspecified
Source_Contribution: A related dataset in this database.
Process_Step:
Process_Description: Original data delivered
Process_Date: 20091006
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Patrick H Ressler, Ph.D.
Contact_Organization:
NOAA Fisheries, AFSC-RACE, Midwater Assessment and Conservation Engineering
Contact_Address:
Address_Type: mailing
Address: 7600 Sand Point Way NE
City: Seattle
State_or_Province: WA
Postal_Code: 98115
Country: USA
Contact_Voice_Telephone: 206-526-47785
Contact_Electronic_Mail_Address: Patrick.Ressler@noaa.gov
Process_Step:
Process_Description:
New metadata record established for B62 Hollowed. Prepared from supplied file Euphausiids_2008_metadata.doc. Name: B62_Hollowed_euphausiid.xml
Process_Date: 20100112
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
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 any 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: XLS
File_Decompression_Technique: No compression applied
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://beringsea.eol.ucar.edu>
Digital_Form:
Digital_Transfer_Information:
Format_Name: ASCII
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: None
Metadata_Reference_Information:
Metadata_Date: 20100111
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_Hollowed_euphausiid.html>
Generated by mp version 2.9.23 on Tue Mar 25 14:53:34 2014