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Dataset Title:  Dates of sea ice movement and sea ice distance in McMurdo Sound, Antarctica
from MODIS and SSMI imagery between 1978-2015 (McMurdo Predator Prey project)
  RSS
Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_674819)
Information:  Summary ? | License ? | ISO 19115 | Metadata | Background (external link) | Subset | Files | Make a graph
 
Variable ?   Optional
Constraint #1 ?
Optional
Constraint #2 ?
   Minimum ?
   or a List of Values ?
   Maximum ?
 
 image_source (unitless) ?              
 latitude (degrees_north) ?      
   - +  ?
  < slider >
 longitude (degrees_east) ?      
   - +  ?
  < slider >
 austral_year (unitless) ?              
 retreat_initial_year (unitless) ?              
 retreat_initial_month (unitless) ?              
 retreat_initial_day (unitless) ?              
 retreat_final_year (unitless) ?              
 retreat_final_month (unitless) ?              
 retreat_final_day (unitless) ?              
 ice_min_year (unitless) ?              
 ice_min_month (unitless) ?              
 ice_min_day (unitless) ?              
 edge_dist_min (kilometers) ?              
 ice_min_west_year (unitless) ?              
 ice_min_west_month (unitless) ?              
 ice_min_west_day (unitless) ?          2    28
 ice_min_east_year (unitless) ?          2003    2015
 ice_min_east_month (unitless) ?          1    3
 ice_min_east_day (unitless) ?          5    25
 refreeze_begin_year (unitless) ?              
 refreeze_begin_month (unitless) ?              
 refreeze_begin_day (unitless) ?              
 
Server-side Functions ?
 distinct() ?
? (" ")

File type: (more info)

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  image_source {
    String description "Image source (MODIS or SSM/I)";
    String ioos_category "Unknown";
    String long_name "Image Source";
    String units "unitless";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 _FillValue NaN;
    Float64 actual_range -77.8539, -77.8539;
    String axis "Y";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String description "Approximate latitude of sampling near McMurdo Station; Antarctica; south is negative";
    String ioos_category "Location";
    String long_name "Latitude";
    String source_name "lat_approx";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 _FillValue NaN;
    Float64 actual_range 166.4686, 166.4686;
    String axis "X";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String description "Approximate longitude of sampling near McMurdo Station; Antarctica; west is negative";
    String ioos_category "Location";
    String long_name "Longitude";
    String source_name "lon_approx";
    String standard_name "longitude";
    String units "degrees_east";
  }
  austral_year {
    String description "Austral Year (start year/end year) in format yyyy/yy";
    String ioos_category "Time";
    String long_name "Austral Year";
    String units "unitless";
  }
  retreat_initial_year {
    String description "Year of initial ice retreat";
    String ioos_category "Time";
    String long_name "Retreat Initial Year";
    String units "unitless";
  }
  retreat_initial_month {
    String description "Month of initial ice retreat";
    String ioos_category "Time";
    String long_name "Retreat Initial Month";
    String units "unitless";
  }
  retreat_initial_day {
    String description "Day of initial ice retreat";
    String ioos_category "Time";
    String long_name "Retreat Initial Day";
    String units "unitless";
  }
  retreat_final_year {
    String description "Year of final ice retreat";
    String ioos_category "Time";
    String long_name "Retreat Final Year";
    String units "unitless";
  }
  retreat_final_month {
    String description "Month of final ice retreat";
    String ioos_category "Time";
    String long_name "Retreat Final Month";
    String units "unitless";
  }
  retreat_final_day {
    String description "Day of final ice retreat";
    String ioos_category "Time";
    String long_name "Retreat Final Day";
    String units "unitless";
  }
  ice_min_year {
    String description "Year ice reached minimum in McMurdo Sound";
    String ioos_category "Ice Distribution";
    String long_name "Ice Min Year";
    String units "unitless";
  }
  ice_min_month {
    String description "Month ice reached minimum in McMurdo Sound";
    String ioos_category "Ice Distribution";
    String long_name "Ice Min Month";
    String units "unitless";
  }
  ice_min_day {
    String description "Day ice reached minimum in McMurdo Sound";
    String ioos_category "Ice Distribution";
    String long_name "Ice Min Day";
    String units "unitless";
  }
  edge_dist_min {
    String description "Linear distance between McMurdo Station and the nearest open water on the day the ice reached the minimum extent for the season.";
    String ioos_category "Unknown";
    String long_name "Edge Dist Min";
    String units "kilometers";
  }
  ice_min_west_year {
    String description "Year ice reached minimum on west side of McMurdo Sound";
    String ioos_category "Ice Distribution";
    String long_name "Ice Min West Year";
    String units "unitless";
  }
  ice_min_west_month {
    String description "Month ice reached minimum on west side of McMurdo Sound";
    String ioos_category "Ice Distribution";
    String long_name "Ice Min West Month";
    String units "unitless";
  }
  ice_min_west_day {
    Byte _FillValue 127;
    Byte actual_range 2, 28;
    String description "Day ice reached minimum on west side of McMurdo Sound";
    String ioos_category "Ice Distribution";
    String long_name "Ice Min West Day";
    String units "unitless";
  }
  ice_min_east_year {
    Int16 _FillValue 32767;
    Int16 actual_range 2003, 2015;
    String description "Year ice reached minimum on east side of McMurdo Sound";
    String ioos_category "Ice Distribution";
    String long_name "Ice Min East Year";
    String units "unitless";
  }
  ice_min_east_month {
    Byte _FillValue 127;
    Byte actual_range 1, 3;
    String description "Month ice reached minimum on east side of McMurdo Sound";
    String ioos_category "Ice Distribution";
    String long_name "Ice Min East Month";
    String units "unitless";
  }
  ice_min_east_day {
    Byte _FillValue 127;
    Byte actual_range 5, 25;
    String description "Day ice reached minimum on east side of McMurdo Sound";
    String ioos_category "Ice Distribution";
    String long_name "Ice Min East Day";
    String units "unitless";
  }
  refreeze_begin_year {
    String description "Year ice began to refreeze";
    String ioos_category "Time";
    String long_name "Refreeze Begin Year";
    String units "unitless";
  }
  refreeze_begin_month {
    String description "Month ice began to refreeze";
    String ioos_category "Time";
    String long_name "Refreeze Begin Month";
    String units "unitless";
  }
  refreeze_begin_day {
    String description "Day ice began to refreeze";
    String ioos_category "Time";
    String long_name "Refreeze Begin Day";
    String units "unitless";
  }
 }
  NC_GLOBAL {
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson";
    String acquisition_description 
"MODIS:
 
Dates of fast ice movement were determined from visible-wavelength scenes from
the MODIS\\u00a0aboard the Aqua and Terra satellites.\\u00a0 MODIS images are
available only for the months when there is sunlight, generally October to
April, and image resolution was 250 m.\\u00a0 Figure A (below) shows the
division of McMurdo Sound into six zones; fast ice areas were generated
manually from clear-sky images by drawing polygons in GIS software, and pack
ice was excluded from analysis. The fast ice in MODIS scenes was sometimes
obscured by clouds, so for days with missing imagery we interpolated linearly
between valid data.\\u00a0 Areas of persistent multiyear ice or glaciers that
were not considered in the analysis (white in the figure).\\u00a0 Linear
distance between McMurdo Station and the nearest open water on the day the ice
reached the minimum extent for the season was also measured.
 
SSMI:
 
In the SSM/I record, images were available for all months of the year, and
image resolution was 25 km.\\u00a0 Figure B (below) shows the total of seven
pixels in the 25 km polar stereographic projection that encompassed McMurdo
Sound; for each pixel, daily or bi-daily fractional sea ice cover was
extracted.\\u00a0 SSM/I passive microwave sea ice observations do not
distinguish between fast ice and pack ice. There are small amounts of land and
ice shelf contamination in pixels 1, 2, 5 and 7.
 
[](\\\\\"https://datadocs.bco-dmo.org/d2/McMurdo_Predator_Prey/MODIS.jpg\\\\\")";
    String awards_0_award_nid "665130";
    String awards_0_award_number "PLR-0944747";
    String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0944747";
    String awards_0_funder_name "NSF Division of Polar Programs";
    String awards_0_funding_acronym "NSF PLR";
    String awards_0_funding_source_nid "490497";
    String awards_0_program_manager "Dr Chris H. Fritsen";
    String awards_0_program_manager_nid "50502";
    String awards_1_award_nid "665135";
    String awards_1_award_number "PLR-0944511";
    String awards_1_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0944511";
    String awards_1_funder_name "NSF Division of Polar Programs";
    String awards_1_funding_acronym "NSF PLR";
    String awards_1_funding_source_nid "490497";
    String awards_1_program_manager "Dr Chris H. Fritsen";
    String awards_1_program_manager_nid "50502";
    String awards_2_award_nid "665138";
    String awards_2_award_number "PLR-0944694";
    String awards_2_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0944694";
    String awards_2_funder_name "NSF Division of Polar Programs";
    String awards_2_funding_acronym "NSF PLR";
    String awards_2_funding_source_nid "490497";
    String awards_2_program_manager "Dr Chris H. Fritsen";
    String awards_2_program_manager_nid "50502";
    String cdm_data_type "Other";
    String comment 
"McMurdo Sound sea ice movement dates from MODIS and SSM/I 
   PIs: Stacy Kim et al. 
     data version: 31 Jan 2017";
    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 2.2d  13 Jun 2019";
    String date_created "2017-01-13T20:02:47Z";
    String date_modified "2018-02-01T20:28:02Z";
    String defaultDataQuery "&time";
    String doi "10.1575/1912/bco-dmo.708227";
    Float64 Easternmost_Easting 166.4686;
    Float64 geospatial_lat_max -77.8539;
    Float64 geospatial_lat_min -77.8539;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 166.4686;
    Float64 geospatial_lon_min 166.4686;
    String geospatial_lon_units "degrees_east";
    String history 
"2019-11-21T10:34:46Z (local files)
2019-11-21T10:34:46Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_674819.html";
    String infoUrl "https://www.bco-dmo.org/dataset/674819";
    String institution "BCO-DMO";
    String instruments_0_acronym "Radiometer";
    String instruments_0_dataset_instrument_description "Scanning Multichannel Microwave Radiometer";
    String instruments_0_dataset_instrument_nid "679682";
    String instruments_0_description "Radiometer is a generic term for a range of instruments used to measure electromagnetic radiation (radiance and irradiance) in the atmosphere or the water column.  For example, this instrument category includes free-fall spectral radiometer (SPMR/SMSR System, Satlantic, Inc), profiling or deck cosine PAR units (PUV-500 and 510, Biospherical Instruments, Inc).  This is a generic term used when specific type, make and model were not specified.";
    String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/122/";
    String instruments_0_instrument_name "Radiometer";
    String instruments_0_instrument_nid "442";
    String instruments_0_supplied_name "Scanning Multichannel Microwave Radiometer";
    String instruments_1_acronym "Radiometer";
    String instruments_1_dataset_instrument_description "Moderate-resolution Imaging Spectroradiometers (MODIS)�";
    String instruments_1_dataset_instrument_nid "679683";
    String instruments_1_description "Radiometer is a generic term for a range of instruments used to measure electromagnetic radiation (radiance and irradiance) in the atmosphere or the water column.  For example, this instrument category includes free-fall spectral radiometer (SPMR/SMSR System, Satlantic, Inc), profiling or deck cosine PAR units (PUV-500 and 510, Biospherical Instruments, Inc).  This is a generic term used when specific type, make and model were not specified.";
    String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/122/";
    String instruments_1_instrument_name "Radiometer";
    String instruments_1_instrument_nid "442";
    String instruments_1_supplied_name "MODIS";
    String instruments_2_acronym "SSM/I";
    String instruments_2_dataset_instrument_description "Special Sensor Microwave Imager-family passive microwave sensors (SSM/I)";
    String instruments_2_dataset_instrument_nid "743378";
    String instruments_2_description "The Special Sensor Microwave Imager (SSM/I) is a passive microwave radiometer that measures atmospheric, oceanic and terrestrial microwave brightness temperatures at 19.35, 22.2, 37.0, and 85.5 GHz, from which ocean surface wind speed, atmospheric water vapour, cloud liquid water and rain rate can be derived. The SSM/I consists of an offset parabolic reflector of dimensions 24 x 26 inches, fed by a corrugated, broad-band, seven-port horn antenna. The reflector and feed are mounted on a drum that contains the radiometers, digital data subsystem, mechanical scanning subsystem, and power subsystem. The reflector-feed-drum assembly is rotated about the axis of the drum by a coaxially mounted bearing and power transfer assembly (BAPTA). All data, commands, timing and telemetry signals, and power pass through the BAPTA on slip ring connectors to the rotating assembly. The absolute brightness temperature of the scene incident upon the antenna is received and spatially filtered by the antenna to produce an effective input signal or antenna temperature at the input of the feed horn antenna. The SSM/I has seven channels, four frequencies, and is orthogonally polarised. It rotates continuously about an axis parallel to the local spacecraft at 31.6 rpm and measures the upwelling scene brightness temperature over an angular range of 102.4 degrees at nadir. The active scene measurements lie +51.2 to -51.2 degrees about the forward (F10, F11) or aft (F8) direction. This results in a swath width of approximately 1400 kilometres. During each 1.9 second scan, 128 discrete uniformly spaced radiometric samples are taken at the two 85 GHz channels and, on alternate scans, 64 discrete samples are taken at the remaining lower frequency channels. The antenna beam intersects the Earth's surface at an incidence angle of 53.1 degrees. Flown on F08, F10, F11, F13, F14, F15, F16, F17, F18 F19. https://nsidc.org/data/docs/daac/ssmi_instrument.gd.html";
    String instruments_2_instrument_name "Special Sensor Microwave Imager";
    String instruments_2_instrument_nid "743376";
    String instruments_2_supplied_name "SSM/I";
    String keywords "austral, austral_year, bco, bco-dmo, begin, biological, chemical, data, dataset, day, dist, distribution, dmo, east, edge, edge_dist_min, erddap, final, ice, ice distribution, ice_min_day, ice_min_east_day, ice_min_east_month, ice_min_east_year, ice_min_month, ice_min_west_day, ice_min_west_month, ice_min_west_year, ice_min_year, image, image_source, initial, latitude, longitude, management, min, month, oceanography, office, preliminary, refreeze, refreeze_begin_day, refreeze_begin_month, refreeze_begin_year, retreat, retreat_final_day, retreat_final_month, retreat_final_year, retreat_initial_day, retreat_initial_month, retreat_initial_year, source, time, west, year";
    String license 
"The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.";
    String metadata_source "https://www.bco-dmo.org/api/dataset/674819";
    Float64 Northernmost_Northing -77.8539;
    String param_mapping "{'674819': {'lat_approx': 'flag - latitude', 'lon_approx': 'flag - longitude'}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/674819/parameters";
    String people_0_affiliation "Moss Landing Marine Laboratories";
    String people_0_affiliation_acronym "MLML";
    String people_0_person_name "Dr Stacy Kim";
    String people_0_person_nid "51714";
    String people_0_role "Chief Scientist";
    String people_0_role_type "originator";
    String people_1_affiliation "Moss Landing Marine Laboratories";
    String people_1_affiliation_acronym "MLML";
    String people_1_person_name "Dr Stacy Kim";
    String people_1_person_nid "51714";
    String people_1_role "Principal Investigator";
    String people_1_role_type "originator";
    String people_2_affiliation "H.T. Harvey & Associates";
    String people_2_person_name "Dr David  G. Ainley";
    String people_2_person_nid "50491";
    String people_2_role "Co-Principal Investigator";
    String people_2_role_type "originator";
    String people_3_affiliation "Point Blue Conservation Science";
    String people_3_person_name "Dr Grant Ballard";
    String people_3_person_nid "566872";
    String people_3_role "Co-Principal Investigator";
    String people_3_role_type "originator";
    String people_4_affiliation "University of South Florida";
    String people_4_affiliation_acronym "USF";
    String people_4_person_name "Dr Kendra L. Daly";
    String people_4_person_nid "50505";
    String people_4_role "Co-Principal Investigator";
    String people_4_role_type "originator";
    String people_5_affiliation "Moss Landing Marine Laboratories";
    String people_5_affiliation_acronym "MLML";
    String people_5_person_name "Dr Stacy Kim";
    String people_5_person_nid "51714";
    String people_5_role "Contact";
    String people_5_role_type "related";
    String people_6_affiliation "Woods Hole Oceanographic Institution";
    String people_6_affiliation_acronym "WHOI BCO-DMO";
    String people_6_person_name "Amber York";
    String people_6_person_nid "643627";
    String people_6_role "BCO-DMO Data Manager";
    String people_6_role_type "related";
    String project "Food web dynamics in an intact ecosystem: the role of top predators in McMurdo Sound";
    String projects_0_acronym "McMurdo Predator Prey";
    String projects_0_description 
"Extracted from the NSF award abstract:
The research project investigates the importance of top down forcing on pelagic food webs. The relatively pristine Ross Sea includes large populations of upper-level predators such as minke and killer whales, Ad�lie and Emperor penguins, and Antarctic toothfish. This project focuses on food web interactions of Ad�lie penguins, minke whales, and the fish-eating Ross Sea killer whales, all of which exert foraging pressure on their main prey, crystal krill (Euphausia cyrstallorophias) and silver fish (Pleuragramma antarcticum) in McMurdo Sound.
The investigators used a video- and acoustic-capable ROV, and standard biological and environmental sensors to quantify the abundance and distribution of phytoplankton, sea ice biota, prey, and relevant habitat data.� The sampling area included 37 stations across an 30 x 15 km section of McMurdo Sound, stratified by distance from the ice edge as a proxy for air-breathing predator access. This study will be among the first to assess top-down forcing in the Ross Sea ecosystem and will form the basis for�multidisciplinary studies in the future.
Map sampling stations";
    String projects_0_end_date "2016-11";
    String projects_0_geolocation "McMurdo Sound, Antarctica";
    String projects_0_name "Food web dynamics in an intact ecosystem: the role of top predators in McMurdo Sound";
    String projects_0_project_nid "665131";
    String projects_0_project_website "https://scini-penguin.mlml.calstate.edu/pauls-wordpress-test-site/";
    String projects_0_start_date "2011-06";
    String publisher_name "Amber York";
    String publisher_role "BCO-DMO Data Manager(s)";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -77.8539;
    String standard_name_vocabulary "CF Standard Name Table v29";
    String subsetVariables "latitude, longitude";
    String summary 
"This dataset contains dates relevant to sea ice movement including dates of
initial ice retreat, final ice retreat, ice minimum, general ice minimum, ice
minimum for the west of McMurdo Sound, ice minimum for the east of McMurdo
Sound, and refreeze start.\\u00a0 It also includes the minimum distance to the
ice edge from McMurdo Station. \\u00a0
 
Dates were derived from Moderate-resolution Imaging Spectroradiometers (MODIS)
collected between 2003 and 2015 and and Scanning Multichannel Microwave
Radiometer and Special Sensor Microwave Imager-family passive microwave
sensors (SSM/I) imagery collected between 1978 and 2015.";
    String title "Dates of sea ice movement and sea ice distance in McMurdo Sound, Antarctica from MODIS and SSMI imagery between 1978-2015 (McMurdo Predator Prey project)";
    String version "1";
    Float64 Westernmost_Easting 166.4686;
    String xml_source "osprey2erddap.update_xml() v1.5-beta";
  }
}

 

Using tabledap to Request Data and Graphs from Tabular Datasets

tabledap lets you request a data subset, a graph, or a map from a tabular dataset (for example, buoy data), via a specially formed URL. tabledap uses the OPeNDAP (external link) Data Access Protocol (DAP) (external link) and its selection constraints (external link).

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.


 
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