B59: 2008-2010 BASIS survey acoustics

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Parker-Stetter, Sandra L. and Horne, John K.

Publication_Date: Unpublished material

Title: B59: 2008-2010 BASIS survey acoustics

Geospatial_Data_Presentation_Form: spreadsheet

Description:

Abstract:

The 2008-2010 BASIS surveys were conducted on the Bering Sea shelf (~30 m to 500 m depth ranges) in August-October aboard the RV Oscar Dyson and FV Epic Explorer. Survey extent varied among the years. Acoustic data (Oscar Dyson - 18, 38, 70, 120, and 200 kHz; Epic Explorer - 38 kHz) were collected along transects between surface trawl stations. One or two midwater trawls were performed each day to identify targets observed on the acoustics. These datasets were analyzed using the 38 kHz acoustic data and midwater+surface trawl data for species or group assignment. Data are presented as integrated water column backscatter (i.e., acoustic energy summed within depth categories) within 0.5 nmi horizontal bins for species or scattering groups. Species or group assignment was made using surface and/or midwater trawl catch composition. Data are from both day and night periods. These data are considered to represent conservative backscatter estimates of age-0 pollock (Pollock0), age-1 pollock (Pollock1), capelin age-0+ (Capelin), Pacific herring (Herring), age-0 Pacific cod (PacificCod0), age-1+ Arctic cod (ArcticCod1+), age-1+ saffron cod (SaffronCod1+), rockfish/Atka mackeral/Pacific sandfish/sand lance/stickleback/rainbow smelt/prowfish (Other), and unidentified, non-partitioned species (UnkFish).

Purpose:

These data provide acoustic backscatter estimates for age-0 pollock (Pollock0), age-1 pollock (Pollock1), capelin age-0+ (Capelin), Pacific herring (Herring), age-0 Pacific cod (PacificCod0), age-1+ Arctic cod (ArcticCod1+), age-1+ saffron cod (SaffronCod1+), rockfish/Atka mackeral/Pacific sandfish/sand lance/stickleback/rainbow smelt/prowfish (Other), and unidentified, non-partitioned species (UnkFish). from the 2008-2010 BASIS surveys. These data are intended to provide an index of relative biomass distribution for BSIERP/BEST models. Users who wish to use the data for other purposes should contact the authors.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20080911

Ending_Date: 20101004

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Description_of_Geographic_Extent: Bering Sea shelf in water depths between 30 to 500 m.

Bounding_Coordinates:

West_Bounding_Coordinate: -173.00000

East_Bounding_Coordinate: -161.00000

North_Bounding_Coordinate: 65.50000

South_Bounding_Coordinate: 54.50000

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: BSIERP fish component

Theme_Keyword: B59

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Bering Sea

Stratum:

Stratum_Keyword_Thesaurus: None

Stratum_Keyword: Bering Sea shelf, 30-500 m water depth

Temporal:

Temporal_Keyword_Thesaurus: None

Temporal_Keyword: Summer 2008

Temporal_Keyword: Summer 2009

Temporal_Keyword: Summer 2010

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: project_number:B59

Theme_Keyword: data_url:<http://data.eol.ucar.edu/codiac/dss/id=245.B59-003>

Theme_Keyword: archive_url:<http://www.eol.ucar.edu/projects/bsierp>

Taxonomy:

Keywords/Taxon:

Taxonomic_Keyword_Thesaurus: None

Taxonomic_Keywords: walleye pollock

Taxonomic_Keywords: Pacific cod

Taxonomic_Keywords: Pacific herring

Taxonomic_Keywords: capelin

Taxonomic_Keywords: Arctic cod

Taxonomic_Keywords: saffron cod

Taxonomic_Keywords: forage fish

Taxonomic_Classification:

Taxon_Rank_Name: Kingdom

Taxon_Rank_Value: Animalia

Taxonomic_Classification:

Taxon_Rank_Name: Subkingdom

Taxon_Rank_Value: Bilateria

Taxonomic_Classification:

Taxon_Rank_Name: Infrakingdom

Taxon_Rank_Value: Deuterostomia

Taxonomic_Classification:

Taxon_Rank_Name: Phylum

Taxon_Rank_Value: Chordata

Taxonomic_Classification:

Taxon_Rank_Name: Subphylum

Taxon_Rank_Value: Vertebrata

Taxonomic_Classification:

Taxon_Rank_Name: Infraphylum

Taxon_Rank_Value: Gnathostomata

Taxonomic_Classification:

Taxon_Rank_Name: Superclass

Taxon_Rank_Value: Osteichthyes

Taxonomic_Classification:

Taxon_Rank_Name: Class

Taxon_Rank_Value: Actinopterygii

Taxonomic_Classification:

Taxon_Rank_Name: Subclass

Taxon_Rank_Value: Neopterygii

Taxonomic_Classification:

Taxon_Rank_Name: Infraclass

Taxon_Rank_Value: Teleostei

Taxonomic_Classification:

Taxon_Rank_Name: Superorder

Taxon_Rank_Value: Clupeomorpha

Taxonomic_Classification:

Taxon_Rank_Name: Order

Taxon_Rank_Value: Clupeiformes

Taxonomic_Classification:

Taxon_Rank_Name: Suborder

Taxon_Rank_Value: Clupeoidei

Taxonomic_Classification:

Taxon_Rank_Name: Family

Taxon_Rank_Value: Clupeidae

Taxonomic_Classification:

Taxon_Rank_Name: Subfamily

Taxon_Rank_Value: Clupeinae

Taxonomic_Classification:

Taxon_Rank_Name: Genus

Taxon_Rank_Value: Clupea

Taxonomic_Classification:

Taxon_Rank_Name: Species

Taxon_Rank_Value: Clupea pallasii

Applicable_Common_Name: Pacific herring

Taxonomic_Classification:

Taxon_Rank_Name: Superorder

Taxon_Rank_Value: Protacanthopterygii

Taxonomic_Classification:

Taxon_Rank_Name: Order

Taxon_Rank_Value: Osmeriformes

Taxonomic_Classification:

Taxon_Rank_Name: Suborder

Taxon_Rank_Value: Osmeroidei

Taxonomic_Classification:

Taxon_Rank_Name: Superfamily

Taxon_Rank_Value: Osmeroidea

Taxonomic_Classification:

Taxon_Rank_Name: Family

Taxon_Rank_Value: Osmeridae

Taxonomic_Classification:

Taxon_Rank_Name: Genus

Taxon_Rank_Value: Mallotus

Taxonomic_Classification:

Taxon_Rank_Name: Species

Taxon_Rank_Value: Mallotus villosus

Applicable_Common_Name: Capelin

Taxonomic_Classification:

Taxon_Rank_Name: Superorder

Taxon_Rank_Value: Paracanthopterygii

Taxonomic_Classification:

Taxon_Rank_Name: Order

Taxon_Rank_Value: Gadiformes

Taxonomic_Classification:

Taxon_Rank_Name: Family

Taxon_Rank_Value: Gadidae

Taxonomic_Classification:

Taxon_Rank_Name: Subfamily

Taxon_Rank_Value: Gadinae

Taxonomic_Classification:

Taxon_Rank_Name: Genus

Taxon_Rank_Value: Boreogadus

Taxonomic_Classification:

Taxon_Rank_Name: Species

Taxon_Rank_Value: Boreogadus saida

Applicable_Common_Name: Arctic cod

Taxonomic_Classification:

Taxon_Rank_Name: Genus

Taxon_Rank_Value: Eleginus

Taxonomic_Classification:

Taxon_Rank_Name: Species

Taxon_Rank_Value: Eleginus gracilis

Applicable_Common_Name: Saffron cod

Taxonomic_Classification:

Taxon_Rank_Name: Genus

Taxon_Rank_Value: Gadus

Taxonomic_Classification:

Taxon_Rank_Name: Species

Taxon_Rank_Value: Gadus macrocephalus

Applicable_Common_Name: Pacific cod

Taxonomic_Classification:

Taxon_Rank_Name: Species

Taxon_Rank_Value: Gadus chalcogrammus

Applicable_Common_Name: Walleye Pollock

Access_Constraints: None

Use_Constraints: None

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

These data are considered to represent conservative backscatter estimates for age-0 pollock (Pollock0), age-1 pollock (Pollock1), capelin age-0+ (Capelin), Pacific herring (Herring), age-0 Pacific cod (PacificCod0), age-1+ Arctic cod (ArcticCod1+), age-1+ saffron cod (SaffronCod1+), rockfish/Atka mackeral/Pacific sandfish/sand lance/stickleback/rainbow smelt/prowfish (Other), and unidentified, non-partitioned species (UnkFish). No formal estimates of accuracy were performed given limited sampling but standard procedures were used throughout the analysis and all acoustic data were cross-checked by two analysts.

Logical_Consistency_Report: not applicable

Completeness_Report:

The following definitions or acronyms are used in these data: Pollock0 = age-0 walleye pollock Pollock1 = age-1 walleye pollock Capelin = age-0+ capelin Hering01 = Pacific herring (age-1 and age-1 combined) PacificCod0 = age-0 Pacific Cod SaffronCod= age-1+ saffron cod ArcticCod = age-1+ Arctic cod OtherSps = rockfish, Atka mackeral, Pacific sandfish, Bering wolffish, sand lance, stickleback, rainbow smelt, prowfish UnkFish = mixed fish (could include any of the above categories), but insufficient trawl data to partition backscatter to species
In the spreadsheet names: AcoustDiel -> Day = daytime data AcoustDiel -> Night = nighttime data Due to diel vertical migration of some species, or in some regions of the study area, there may be differences in the Day and Night data. For absolute consistency, only Day data should be used but this will result in the exclusion of some key transect regions. Users should be aware that potential "hot spots" in the data may be from Night and not the aggregation of organisms.
Category = analytic region: Stratified = estimate is 15 m below the surface to 0.5 m from the bottom in the Middle and Outer Domains. Estimates are provided for Shallow (pycnocline and above) and Deep (below pycnocline) regions Mixed = estimate is 15 m below the surface to 0.5 m from the bottom in appoximately the Inner Domain. Estimates are water column.
Backscatter (NASC, sA, m^2/nmi^2) is broken into: _wc = water column, from the 15 m below the surface to 0.5 m from the bottom. This estimate is provided for the Mixed region (it's a water column estimate as described above) and for the Stratified region (by summing the Shallow and Deep estimates) _shallow = 15 m below the surface to the base of the fish/jelly-associated pycnocline layer (Middle domain) or to 35 m (Outer domain) _deep = the base of the pycnocline (Middle Domain) or 35 m (Outer Domain) to 0.5 m from the bottom. Only in the Stratified region.
Column headers and additional notes are given in the "File Info" page of the Excel file.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: none

Lineage:

Methodology:

Methodology_Type: Field

Methodology_Description:

Acoustic data contained in this dataset were collected with the 38 kHz Simrad EK60 unit on the RV Oscar Dyson or the 38 kHz ES60 unit on the FV Epic Explorer.

Process_Step:

Process_Description:

Noise (TVG-rampled) was removed from the data using traditional (linear subtraction) methods. A 10 dB signal-to-noise (SNR) ratio was imposed.
A 0.5 m backstep was used to exclude data from withon 0.5 m of the bottom. To account for transducer location (9.15 m from the surface on the RV Oscar Dyson) and saturation, data were excluded from the surface to 15 m depth.

Process_Date: Unknown

Process_Step:

Process_Description:

The bottom of the fish/jellyfish-associated pycnocline layer was defined in the Middle Domain using a edge-detection routine and smoothed by an operator. In the Outer Domain, where the layer was weak or absent, the layer was defined at 35 m (the average maximum depth of the trawl, also approximately the maximum depth of the pycnocline in the Middle Domain). In the Inner domain, no layer was present/dectected. "mixed" = ~Inner Domain, no layer detection, water column estimates "shallow" = Middle and Outer Domains, region above the base of the fish/jellyfish-associated pycnocline "deep" = Middle and Outer Domains, region below the base of the fish/jellyfish-associated pycnocline

Process_Date: Unknown

Process_Step:

Process_Description:

A -67 dB Sv minimum threshold (based on additional analyses) was used for fish in all regions. No maximum threshold was applied.
All fish backscatter data (NASC=sA in units of m^2/nmi^2) were exported in 0.5 nmi horizontal bins for the entire water column (between 15 m depth and 0.5 m from the bottom in all regions, and from above/below the fish/jellyfish-associate pycnocline (Middle and Outer Domains).
Fish composition was derived using surface and/or midwater trawl catches. Trawls with a minimum non-salmon catch of 20 fish were included in calculations. Any fish species and age-group that constituted a minimum of 5% of the catch (by number) in any individual trawl was included.
The fish composition within each trawl was calculated by converting individual fish species lengths from the measured catch subsample to acoustic target strength (sigmabs) using published TS-length equations.
Surface trawls and shallow midwater trawls were used to classify the "stratified-shallow" and "mixed" fish acoustic data. Differences between surface catches of herring and midwater trawl catches suggested that herring were present within the top 15-20 m of water. For that reason, herring are only estimated for regions classified as mixed. Herring are not included in shallow estimates.
Deep midwater trawls (below the pycnocline) were used to classify the "deep" fish acoustic data. Fish species were classified as "UnkFish" in regions with insufficient deep midwater trawls to identify species.
0.5 nmi acoustic bins were matched with trawl catch composition in ArcMap.

Process_Date: Unknown

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: n/a

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:

Ellipsoid_Name: World Geodetic System of 1984

Semi-major_Axis: 6378137

Denominator_of_Flattening_Ratio: 298.25722210088

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

The dataset contains the following items. Column headers are listed in CAPITAL letters.
INTERVAL is the analytic number for the horizontal bin (0.5 nmi) that references our dataset
ACOUSTDIEL indicates whether the data are from day or night
CATEGORY = whether the data are from "Mixed" (~Inner domain, treated as water column) or "Stratified" (Middle and Outer domains, treated as Shallow (pycnocline and above) and Deep (below the pycnocline)
DATEM is date (in GMT) at the middle of the INTERVAL
LATM is the geographic coordinate (decimal degrees) at the middle of the INTERVAL
LONM is the corresponding geographic coordinate (decimal degrees) at the middle of the INTERVAL
DISTM is for our reference
ORDER is for our reference
_WC = water column estimates from 15 m below the surface to 0.5 m from the bottom. This value is the sum of the _SHALLOW and _DEEP estimates. Mixed regions only have _WC estimates. _SHALLOW data are from 15 m below the surface to the base of the pycnocline-associated fish/jellyfish layer. These data are from the Middle and Outer Domains. _DEEP = data from from the base of the pycnocline-associated fish/jellyfish layer to 0.5 m above the bottom. These data are from the Middle and Outer domains.
<GROUP>NASC (where GROUP is Other, Capelin, Herring01, PacificCod0, Pollock0, Pollock1, SaffronCod1+, and ArcticCod1+) is the acoustic backscatter (NASC in units of m^2/nmi^2) integrated over the depth category (_WC, _SHALLOW, or _DEEP) within the 0.5 nmi INTERVAL. This is the field that should be used for relative distribution **<GROUP>NASC values are additive within a depth category and can be summed to generate a total forage fish estimate
In the spreadsheet titles: BASIS_2008 = 2008 acoustic data BASIS_2009 = 2009 acoustic data BASIS_2010 = 2010 acoustic data

Entity_and_Attribute_Detail_Citation: Spreadsheet explanation

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: 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>

Fees: None

Metadata_Reference_Information:

Metadata_Date: 20110913

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Sandra Parker-Stetter or John Horne

Contact_Organization: University of Washington

Contact_Address:

Address_Type: mailing

Address: UW-SAFS

Address: Box 355020

City: Seattle

State_or_Province: Wahington

Postal_Code: 98195-5020

Country: United States

Contact_Voice_Telephone: 206-221-5459 (SPS)

Contact_Voice_Telephone: 206-221-6890 (JH)

Contact_Electronic_Mail_Address: slps@u.washington.edu

Contact_Electronic_Mail_Address: jhorne@u.washington.edu

Metadata_Standard_Name:

FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001.1-1999