Accessing BCO-DMO data
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BCO-DMO ERDDAP
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| Dataset Title: | Nautical Area Scattering Coefficients (NASC) from R/V New Horizon cruises NH1106 and NH1006 in the Guaymas Basin in 2010 and 2011 (Jumbo Squid Physiology project) 
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| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_4013) |
| Information: | Summary
| License
| ISO 19115
| Metadata
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Attributes {
s {
cruise_id {
String bcodmo_name "cruise_id";
String description "Cruise identifier.";
String long_name "Cruise Id";
String units "text";
}
cruise_start_date {
Int32 _FillValue 2147483647;
Int32 actual_range 20100603, 20110604;
String bcodmo_name "start_date";
String description "Year, month, and day cruise began in YYYYmmdd format.";
String long_name "Cruise Start Date";
String units "unitless";
}
cruise_end_date {
Int32 _FillValue 2147483647;
Int32 actual_range 20100616, 20110622;
String bcodmo_name "end_date";
String description "Year, month, and day cruise ended in YYYYmmdd format.";
String long_name "Cruise End Date";
String units "unitless";
}
date_start {
Int32 _FillValue 2147483647;
Int32 actual_range 20100604, 20110622;
String bcodmo_name "date_begin";
String description "Date at start of integration bin in YYYYmmdd format.";
String long_name "Date Start";
String units "unitless";
}
time_start {
String bcodmo_name "time_start";
String description "Time (UTC) at start of integration bin in hours, minutes, and decimal minutes.";
String long_name "Time Start";
String units "HHMM.mmmm";
}
date_end {
Int32 _FillValue 2147483647;
Int32 actual_range 20100604, 20110622;
String bcodmo_name "date_end";
String description "Date at end of integration bin in YYYYmmdd format.";
String long_name "Date End";
String units "unitless";
}
time_end {
String bcodmo_name "time_end";
String description "Time (UTC) at end of integration bin in hours, minutes, and decimal minutes.";
String long_name "Time End";
String units "HHMM.mmmm";
}
NASC {
Float64 _FillValue NaN;
Float64 actual_range 8.035541, 67177.38664;
String bcodmo_name "unknown";
String description "Nautical Area Scattering Coefficient (NASC).";
String long_name "NASC";
String units "m2 nmi-2";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue NaN;
Float64 actual_range 27.2431833, 28.8788278;
String axis "Y";
String bcodmo_name "lat_start";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String description "Latitude at start of integration bin.";
String ioos_category "Location";
String long_name "Latitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
String source_name "lat_start";
String standard_name "latitude";
String units "degrees_north";
}
longitude {
String _CoordinateAxisType "Lon";
Float64 _FillValue NaN;
Float64 actual_range -113.2795402, -110.904157;
String axis "X";
String bcodmo_name "lon_start";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String description "Longitude at start of integration bin.";
String ioos_category "Location";
String long_name "Longitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
String source_name "lon_start";
String standard_name "longitude";
String units "degrees_east";
}
lat_end {
Float64 _FillValue NaN;
Float64 actual_range 27.24320167, 28.878825;
String bcodmo_name "lat_end";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String description "Latitude at end of integration bin.";
String long_name "Latitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
String standard_name "latitude";
String units "decimal degrees";
}
lon_end {
Float64 _FillValue NaN;
Float64 actual_range -113.2795428, -110.9041639;
String bcodmo_name "lon_end";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String description "Longitude at end of integration bin.";
String long_name "Longitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
String standard_name "longitude";
String units "decimal degrees";
}
exclusion_line_mean_depth {
Float64 _FillValue NaN;
Float64 actual_range 35.221337, 500.0;
String bcodmo_name "unknown";
String description "Mean depth of the exclusion line for each bin.";
String long_name "Exclusion Line Mean Depth";
String units "meters";
}
integration_layer_thickness_mean {
Float64 _FillValue NaN;
Float64 actual_range 30.231147, 494.967585;
String bcodmo_name "unknown";
String description "Average thickness of the integrated cell.";
String long_name "Integration Layer Thickness Mean";
String units "meters";
}
}
NC_GLOBAL {
String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson";
String acquisition_description
"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.
Noise from splash down, electrical interference, and CTD casts were flagged as
\\u2018bad data\\u2019 using Echoview software before integration. 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 nmi-2) are provided.";
String awards_0_award_nid "55202";
String awards_0_award_number "OCE-0851239";
String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward?AWD_ID=0851239";
String awards_0_funder_name "NSF Division of Ocean Sciences";
String awards_0_funding_acronym "NSF OCE";
String awards_0_funding_source_nid "355";
String awards_0_program_manager "David L. Garrison";
String awards_0_program_manager_nid "50534";
String cdm_data_type "Other";
String comment
"Integrated Acoustic Scattering
Guaymas Basin, Gulf of California
PI: Kelly Benoit-Bird (OSU)
Version: 15 Aug 2013";
String Conventions "COARDS, CF-1.6, ACDD-1.3";
String creator_email "info@bco-dmo.org";
String creator_name "BCO-DMO";
String creator_type "institution";
String creator_url "https://www.bco-dmo.org/";
String data_source "extract_data_as_tsv version 2.3 19 Dec 2019";
String date_created "2013-08-15T18:42:10Z";
String date_modified "2019-11-12T21:00:18Z";
String defaultDataQuery "&time<now";
String doi "10.1575/1912/bco-dmo.4013.1";
Float64 Easternmost_Easting -110.904157;
Float64 geospatial_lat_max 28.8788278;
Float64 geospatial_lat_min 27.2431833;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -110.904157;
Float64 geospatial_lon_min -113.2795402;
String geospatial_lon_units "degrees_east";
String history
"2024-04-20T13:19:14Z (local files)
2024-04-20T13:19:14Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_4013.html";
String infoUrl "https://www.bco-dmo.org/dataset/4013";
String institution "BCO-DMO";
String instruments_0_acronym "Simrad EK-60 echosounder";
String instruments_0_dataset_instrument_description "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.";
String instruments_0_dataset_instrument_nid "6240";
String instruments_0_description "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.";
String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L22/current/TOOL0198/";
String instruments_0_instrument_name "Simrad EK-60 echosounder";
String instruments_0_instrument_nid "716";
String instruments_0_supplied_name "Simrad EK-60 echosounder";
String keywords "bco, bco-dmo, biological, chemical, cruise, cruise_end_date, cruise_id, cruise_start_date, 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";
String license "https://www.bco-dmo.org/dataset/4013/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/4013";
Float64 Northernmost_Northing 28.8788278;
String param_mapping "{'4013': {'lon_start': 'flag - longitude', 'lat_start': 'flag - latitude'}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/4013/parameters";
String people_0_affiliation "Oregon State University";
String people_0_affiliation_acronym "OSU-CEOAS";
String people_0_person_name "Kelly Benoit-Bird";
String people_0_person_nid "51716";
String people_0_role "Principal Investigator";
String people_0_role_type "originator";
String people_1_affiliation "Oregon State University";
String people_1_affiliation_acronym "OSU-CEOAS";
String people_1_person_name "Chad Waluk";
String people_1_person_nid "51717";
String people_1_role "Contact";
String people_1_role_type "related";
String people_2_affiliation "Woods Hole Oceanographic Institution";
String people_2_affiliation_acronym "WHOI BCO-DMO";
String people_2_person_name "Shannon Rauch";
String people_2_person_nid "51498";
String people_2_role "BCO-DMO Data Manager";
String people_2_role_type "related";
String project "Jumbo Squid Physiology";
String projects_0_acronym "Jumbo Squid Physiology";
String projects_0_description
"This project concerns the ecological physiology of Dosidicus gigas, a large squid endemic to the eastern Pacific where it inhabits both open ocean and continental shelf environments. Questions to be addressed include:
1) How does utilization of the OML by D. gigas vary on both a daily and seasonal basis, and how do the vertical distributions of the OML and its associated fauna vary?
2) What behaviors of squid are impaired by conditions found in the OML, and how are impairments compensated to minimize costs of utilizing this environment? and
3) What are the physiological and biochemical processes by which squid maintain swimming activity at such remarkable levels under low oxygen conditions?
The investigators will use an integrated approach involving oceanographic, acoustic, electronic tagging, physiological and biochemical methods. D. gigas provides a trophic connection between small, midwater organisms and top vertebrate predators, and daily vertical migrations between near-surface waters and a deep, low-oxygen environment (OML) characterize normal behavior of adult squid. Electronic tagging has shown that this squid can remain active for extended periods in the cold, hypoxic conditions of the upper OML. Laboratory studies have demonstrated suppression of aerobic metabolism during a cold, hypoxic challenge, but anaerobic metabolism does not appear to account for the level of activity maintained. Utilization of the OML in the wild may permit daytime foraging on midwater organisms. Foraging also occurs near the surface at night, and Dosidicus may thus be able to feed continuously. D. gigas is present in different regions of the Guaymas Basin on a predicable year-round basis, allowing changes in squid distribution to be related to changing oceanographic features on a variety time scales.
This research is of broad interest because Dosidicus gigas has substantially extended its range over the last decade, and foraging on commercially important finfish in invaded areas off California and Chile has been reported. In addition, the OML has expanded during the last several decades, mostly vertically by shoaling, including in the Gulf of Alaska, the Southern California Bight and several productive regions of tropical oceans, and a variety of ecological impacts will almost certainly accompany changes in the OML. Moreover, D. gigas currently supports the world's largest squid fishery, and this study will provide acoustic methods for reliable biomass estimates, with implications for fisheries management in Mexico and elsewhere.
This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). This is a Collaborative Research project encompassing three NSF-OCE awards.
Background Publications:
Stewart, J.S., Field, J.C., Markaida, U., and Gilly, W.F. 2013. Behavioral ecology of jumbo squid (Dosidicus gigas) in relation to oxygen minimum zones. Deep Sea Research Part II: Topical Studies in Oceanography, 95, 197-208. doi:10.1016/j.dsr2.2012.06.005.
Gilly, W.F., Zeidberg, L.D., Booth, J.A.T, Stewart, J.S., Marshall, G., Abernathy, K., and Bell, L.E. 2012. Locomotion and behavior of Humboldt squid, Dosidicus gigas, in relation to natural hypoxia in the Gulf of California, Mexico. The Journal of Experimental Biology, 215, 3175-3190. doi: 10.1242/jeb.072538.
Related Project: Physiological limits to vertical migrations of the pelagic, jumbo squid, Dosidicus gigas in the Gulf of California";
String projects_0_end_date "2013-07";
String projects_0_geolocation "Guaymas Basin, Gulf of California, Mexico (27 N 112 W) and Monterey Bay, CA (36 N 123 W)";
String projects_0_name "Hypoxia and the ecology, behavior and physiology of jumbo squid, Dosidicus gigas";
String projects_0_project_nid "2279";
String projects_0_start_date "2009-08";
String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
String publisher_type "institution";
String sourceUrl "(local files)";
Float64 Southernmost_Northing 27.2431833;
String standard_name_vocabulary "CF Standard Name Table v55";
String summary "Integrated, area scattering values, or Natuical Area Scattering Coefficients (NASC) are provided from two cruises in the Guaymas Basin that occurred in June 2010 and June 2011. 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\\nRaw acoustic scattering data (.raw files) are extremely large. These are archived at Oregon State University and will be shared using physical media upon request.";
String title "Nautical Area Scattering Coefficients (NASC) from R/V New Horizon cruises NH1106 and NH1006 in the Guaymas Basin in 2010 and 2011 (Jumbo Squid Physiology project)";
String version "1";
Float64 Westernmost_Easting -113.2795402;
String xml_source "osprey2erddap.update_xml() v1.3";
}
}
Data Access Protocol (DAP) and its
selection constraints.
The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.
Tabledap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names,
followed by a collection of
constraints (e.g., variable<value),
each preceded by '&' (which is interpreted as "AND").
For details, see the tabledap Documentation.