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Title Sum-
Institution Dataset ID
     data   graph     files  public Nautical Area Scattering Coefficients (NASC) from an R/V BIP cruise in the Guaymas Basin,
Gulf of California in 2013 (Jumbo Squid El Nino Response project)
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The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL access_formats String .htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson
attribute NC_GLOBAL acquisition_description String Acoustic data were collected nearly continuously using Simrad EK60s at 4
frequencies (38, 70, 120, and 200 kHz). Split beam transducers (Simrad model
numbers: 38-12, 70-7c, 120-7c, 200-7c) were mounted 1.5 m below the surface on
a rigid pole. Each transmitted a 512 us pulse as frequently as possible for
the water depth. Raw data were stored using Simrad ER60 software.

Acoustic backscattering values at 38 kHz that were greater than -75 dB were
integrated in 1 km horizontal bins from depths of 5m to 500m or 1 m above the
bottom, whichever was shallower. These integrated, area scattering values or
Nautical Area Scattering Coefficients (NASC: m2\u00a0nmi-2)\u00a0are provided.
Noise removal from this data set (e.g. splash down, electrical interference,
and CTD casts) was minimal before integration.
attribute NC_GLOBAL awards_0_award_nid String 520405
attribute NC_GLOBAL awards_0_award_number String OCE-1338432
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward?AWD_ID=1338432 (external link)
attribute NC_GLOBAL awards_0_funder_name String NSF Division of Ocean Sciences
attribute NC_GLOBAL awards_0_funding_acronym String NSF OCE
attribute NC_GLOBAL awards_0_funding_source_nid String 355
attribute NC_GLOBAL awards_0_program_manager String David L. Garrison
attribute NC_GLOBAL awards_0_program_manager_nid String 50534
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Integrated Acoustic Scattering
Guaymas Basin, Gulf of Mexico, October 2013
PI: Kelly Benoit-Bird (OSU)
Version: 23 July 2014
attribute NC_GLOBAL Conventions String COARDS, CF-1.6, ACDD-1.3
attribute NC_GLOBAL creator_email String info at bco-dmo.org
attribute NC_GLOBAL creator_name String BCO-DMO
attribute NC_GLOBAL creator_type String institution
attribute NC_GLOBAL creator_url String https://www.bco-dmo.org/ (external link)
attribute NC_GLOBAL data_source String extract_data_as_tsv version 2.3 19 Dec 2019
attribute NC_GLOBAL date_created String 2014-07-23T15:13:04Z
attribute NC_GLOBAL date_modified String 2019-12-30T16:54:50Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.520594.1
attribute NC_GLOBAL Easternmost_Easting double -111.3343637
attribute NC_GLOBAL geospatial_lat_max double 28.8857926
attribute NC_GLOBAL geospatial_lat_min double 27.24179
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -111.3343637
attribute NC_GLOBAL geospatial_lon_min double -113.3081006
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/520594 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String Simrad EK-60 echosounder
attribute NC_GLOBAL instruments_0_dataset_instrument_description String Acoustic data were collected nearly continuously using Simrad EK60s at 4 frequencies (38, 70, 120, and 200 kHz). Split beam transducers (Simrad model numbers: 38-12, 70-7c, 120-7c, 200-7c) were mounted 1.5 m below the surface on a rigid pole.
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 520598
attribute NC_GLOBAL instruments_0_description String A split-beam scientific echosounder primarily designed for fisheries research. It can operate seven frequencies simultaneously ranging from 18 to 710 kHz. Real time echo integration and target strength analysis in an unlimited number of layers is provided as well as storage of raw data for replay or analysis in one of several post-processing software packages such as Simrad's BI60.
attribute NC_GLOBAL instruments_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L22/current/TOOL0198/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String Simrad EK-60 echosounder
attribute NC_GLOBAL instruments_0_instrument_nid String 716
attribute NC_GLOBAL instruments_0_supplied_name String Simrad EK-60 echosounder
attribute NC_GLOBAL keywords String bco, bco-dmo, biological, chemical, data, dataset, date, date_end, date_start, depth, dmo, end, erddap, exclusion, exclusion_line_mean_depth, integration, integration_layer_thickness_mean, lat_end, latitude, layer, line, lon_end, longitude, management, mean, nasc, oceanography, office, preliminary, start, thickness, time, time_end, time_start
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/520594/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/520594 (external link)
attribute NC_GLOBAL Northernmost_Northing double 28.8857926
attribute NC_GLOBAL param_mapping String {'520594': {'lon_start': 'flag - longitude', 'lat_start': 'flag - latitude'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/520594/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String Oregon State University
attribute NC_GLOBAL people_0_affiliation_acronym String OSU-CEOAS
attribute NC_GLOBAL people_0_person_name String Kelly Benoit-Bird
attribute NC_GLOBAL people_0_person_nid String 51716
attribute NC_GLOBAL people_0_role String Principal Investigator
attribute NC_GLOBAL people_0_role_type String originator
attribute NC_GLOBAL people_1_affiliation String Oregon State University
attribute NC_GLOBAL people_1_affiliation_acronym String OSU-CEOAS
attribute NC_GLOBAL people_1_person_name String Chad Waluk
attribute NC_GLOBAL people_1_person_nid String 51717
attribute NC_GLOBAL people_1_role String Contact
attribute NC_GLOBAL people_1_role_type String related
attribute NC_GLOBAL people_2_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_2_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_2_person_name String Shannon Rauch
attribute NC_GLOBAL people_2_person_nid String 51498
attribute NC_GLOBAL people_2_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_2_role_type String related
attribute NC_GLOBAL project String Jumbo Squid El Nino Response
attribute NC_GLOBAL projects_0_acronym String Jumbo Squid El Nino Response
attribute NC_GLOBAL projects_0_description String Description from NSF award abstract:
This project will examine the response of Dosidicus gigas (Humboldt squid) to an El Niño event in 2009-2010 that was accompanied by a collapse of the commercial fishery for this squid in the Guaymas Basin within the Gulf of California. This large squid is a major predator of great ecological and economic importance in the Gulf of California, the California Current, and Peru Current systems. In early 2010, these squid abandoned their normal coastal-shelf habitats in the Guaymas Basin and instead were found in the Salsipuedes Basin to the north, an area buffered from the effects of El Niño by the upwelling of colder water. The commercial fishery also relocated to this region and large squid were not found in the Guaymas Basin from 2010-2012, instead animals that matured at an unusually small size and young age were abundant. A return to the large size-at-maturity condition has still not occurred, despite the apparent return of normal oceanographic conditions.
The El Niño of 2009-2010 presented an unforeseen opportunity to reveal an important feature of adaptability of Dosidicus gigas to an acute climatic anomaly, namely a large decrease in size and age at maturity. Now these investigators will have the opportunity to document recovery to the normal large size-at-maturity condition. The specific aims of this project are:
1) continue a program of acoustic surveys and direct sampling of squid that has already been established in the Gulf of California in order to assess distribution, biomass, life history strategy diet, and migratory and foraging behaviors relative to pre-El Niño conditions and
2) conduct analogous surveys in Monterey Bay, California in conjunction with long-term remote operated vehicle surveys of squid abundance.
The data from these studies will provide a comparison of recovery in the two different squid populations and yield valuable insights into what ecological effects an area is expected to experience with an invasion of either small or large Humboldt squid. As long-term climate change progresses, squid of both forms may expand northward into the California Current System.
Related Project: Hypoxia and the ecology, behavior and physiology of jumbo squid, Dosidicus gigas
attribute NC_GLOBAL projects_0_end_date String 2015-06
attribute NC_GLOBAL projects_0_geolocation String Gulf of California and Monterey Bay
attribute NC_GLOBAL projects_0_name String Adaptable life history strategy of a migratory large predator in response to El Nino and climate change
attribute NC_GLOBAL projects_0_project_nid String 520407
attribute NC_GLOBAL projects_0_start_date String 2013-07
attribute NC_GLOBAL publisher_name String Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute NC_GLOBAL publisher_type String institution
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double 27.24179
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL summary String Integrated, area scattering values, or Natuical Area Scattering Coefficients (NASC) are provided from one cruise in the Guaymas Basin that occurred October 2013. Also included are the time (UTC) and location at the start and end of each integration bin, mean depth of the exclusion line for each bin, and the average thickness of the integrated cell.\r\n\r\nNote that noise removal from this data set (e.g. splash down, electrical interference, and CTD casts) was minimal before integration. Raw acoustic scattering data (.raw files) are extremely large. These are archived at Oregon State University and will be shared using physical media upon request.
attribute NC_GLOBAL title String Nautical Area Scattering Coefficients (NASC) from an R/V BIP cruise in the Guaymas Basin, Gulf of California in 2013 (Jumbo Squid El Nino Response project)
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL Westernmost_Easting double -113.3081006
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable date_start   int  
attribute date_start _FillValue int 2147483647
attribute date_start actual_range int 20131020, 20131025
attribute date_start bcodmo_name String date_begin
attribute date_start description String Date at start of integration bin. in the format YYYYmmdd
attribute date_start long_name String Date Start
attribute date_start units String unitless
variable time_start   String  
attribute time_start bcodmo_name String time_start
attribute time_start description String Time (UTC) at start of integration bin in hours, minutes, and decimal minutes.
attribute time_start long_name String Time Start
attribute time_start units String HHMM.mmmm
variable date_end   int  
attribute date_end _FillValue int 2147483647
attribute date_end actual_range int 20131020, 20131025
attribute date_end bcodmo_name String date_end
attribute date_end description String Date at end of integration bin. in the format YYYYmmdd
attribute date_end long_name String Date End
attribute date_end units String unitless
variable time_end   String  
attribute time_end bcodmo_name String time_end
attribute time_end description String Time (UTC) at end of integration bin in hours, minutes, and decimal minutes.
attribute time_end long_name String Time End
attribute time_end units String HHMM.mmmm
variable NASC   double  
attribute NASC _FillValue double NaN
attribute NASC actual_range double 65.507579, 325420.6341
attribute NASC bcodmo_name String unknown
attribute NASC description String Nautical Area Scattering Coefficient (NASC).
attribute NASC long_name String NASC
attribute NASC units String m2 nmi-2
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double NaN
attribute latitude actual_range double 27.24179, 28.8857926
attribute latitude axis String Y
attribute latitude bcodmo_name String lat_start
attribute latitude colorBarMaximum double 90.0
attribute latitude colorBarMinimum double -90.0
attribute latitude description String Latitude at start of integration bin.
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LATX/ (external link)
attribute latitude source_name String lat_start
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
variable longitude   double  
attribute longitude _CoordinateAxisType String Lon
attribute longitude _FillValue double NaN
attribute longitude actual_range double -113.3081006, -111.3343637
attribute longitude axis String X
attribute longitude bcodmo_name String lon_start
attribute longitude colorBarMaximum double 180.0
attribute longitude colorBarMinimum double -180.0
attribute longitude description String Longitude at start of integration bin.
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LONX/ (external link)
attribute longitude source_name String lon_start
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
variable lat_end   double  
attribute lat_end _FillValue double NaN
attribute lat_end actual_range double 27.24180667, 28.88577939
attribute lat_end bcodmo_name String lat_end
attribute lat_end colorBarMaximum double 90.0
attribute lat_end colorBarMinimum double -90.0
attribute lat_end description String Latitude at end of integration bin.
attribute lat_end long_name String Latitude
attribute lat_end nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LATX/ (external link)
attribute lat_end standard_name String latitude
attribute lat_end units String decimal degrees
variable lon_end   double  
attribute lon_end _FillValue double NaN
attribute lon_end actual_range double -113.3081115, -111.3343267
attribute lon_end bcodmo_name String lon_end
attribute lon_end colorBarMaximum double 180.0
attribute lon_end colorBarMinimum double -180.0
attribute lon_end description String Longitude at end of integration bin.
attribute lon_end long_name String Longitude
attribute lon_end nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LONX/ (external link)
attribute lon_end standard_name String longitude
attribute lon_end units String decimal degrees
variable exclusion_line_mean_depth   double  
attribute exclusion_line_mean_depth _FillValue double NaN
attribute exclusion_line_mean_depth actual_range double 18.341811, 500.0
attribute exclusion_line_mean_depth bcodmo_name String unknown
attribute exclusion_line_mean_depth description String Mean depth of the exclusion line for each bin.
attribute exclusion_line_mean_depth long_name String Exclusion Line Mean Depth
attribute exclusion_line_mean_depth units String meters
variable integration_layer_thickness_mean   double  
attribute integration_layer_thickness_mean _FillValue double NaN
attribute integration_layer_thickness_mean actual_range double 12.322174, 494.011495
attribute integration_layer_thickness_mean bcodmo_name String unknown
attribute integration_layer_thickness_mean description String Average thickness of the integrated cell.
attribute integration_layer_thickness_mean long_name String Integration Layer Thickness Mean
attribute integration_layer_thickness_mean units String meters

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.

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