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ERDDAP
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Grid DAP Data | Sub- set | Table DAP Data | Make A Graph | W M S | Source Data Files | Title | Sum- mary | FGDC, ISO, Metadata | Back- ground Info | RSS | E | Institution | Dataset ID |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
data | graph | M | Data from a local source. | ![]() | F I M | background![]() | ![]() | ![]() | ??? | SNAP_SEA_ICE_ATLAS |
Row Type | Variable Name | Attribute Name | Data Type | Value |
---|---|---|---|---|
attribute | NC_GLOBAL | _CoordSysBuilder | String | ucar.nc2.internal.dataset.conv.CF1Convention |
attribute | NC_GLOBAL | acknowledgement | String | The Historical Sea Ice Atlas was a joint project funded by the Alaska Ocean Observing System (AOOS), the Alaska Center for Climate Assessment and Policy (ACCAP) and the Scenarios Network for Alaska and Arctic Planning (SNAP). This work was funded by the National Ocean Service at the National Oceanic and Atmospheric Administration (NOAA) through AOOS grant #NA11NOS0120020. Work was performed at UAF by the International Arctic Research Center's ACCAP (funded by the NOAA Office of Oceanic and Atmospheric Research) and SNAP, with assistance from the University of Illinois, Urbana-Champaign. |
attribute | NC_GLOBAL | cdm_data_type | String | Grid |
attribute | NC_GLOBAL | Conventions | String | CF-1.6, COARDS, Unidata Dataset Discovery v1.0 |
attribute | NC_GLOBAL | creator_email | String | takurkowski at alaska.edu |
attribute | NC_GLOBAL | creator_name | String | Tom Kurkowski |
attribute | NC_GLOBAL | creator_url | String | http://www.snap.uaf.edu/![]() |
attribute | NC_GLOBAL | date_created | String | 2022-02-01T22:58:00Z |
attribute | NC_GLOBAL | date_issued | String | 2022-02-01T22:58:00Z |
attribute | NC_GLOBAL | Easternmost_Easting | double | -119.875 |
attribute | NC_GLOBAL | GDAL | String | GDAL 2.2.1, released 2017/06/23 |
attribute | NC_GLOBAL | GDAL_AREA_OR_POINT | String | Area |
attribute | NC_GLOBAL | geospatial_lat_max | double | 80.125 |
attribute | NC_GLOBAL | geospatial_lat_min | double | 40.125 |
attribute | NC_GLOBAL | geospatial_lat_resolution | double | 0.25 |
attribute | NC_GLOBAL | geospatial_lat_units | String | degrees_north |
attribute | NC_GLOBAL | geospatial_lon_max | double | -119.875 |
attribute | NC_GLOBAL | geospatial_lon_min | double | -179.875 |
attribute | NC_GLOBAL | geospatial_lon_resolution | double | 0.25 |
attribute | NC_GLOBAL | geospatial_lon_units | String | degrees_east |
attribute | NC_GLOBAL | history | String | Tue Feb 01 13:52:51 2022: GDAL CreateCopy( nc/seaice_conc_sic_mean_pct_monthly_ak_1850_01.nc, ... ) |
attribute | NC_GLOBAL | id | String | seaiceatlas |
attribute | NC_GLOBAL | infoUrl | String | ??? |
attribute | NC_GLOBAL | institution | String | ??? |
attribute | NC_GLOBAL | keywords | String | alaska, concentration, data, distribution, estimates, ice, ice distribution, local, monthly, observed, sea, source, waters |
attribute | NC_GLOBAL | license | String | 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. |
attribute | NC_GLOBAL | Metadata_Conventions | String | CF-1.6, COARDS, Unidata Dataset Discovery v1.0 |
attribute | NC_GLOBAL | metadata_link | String | http://seaiceatlas.snap.uaf.edu/![]() |
attribute | NC_GLOBAL | model | String | SNAP Sea Ice Atlas |
attribute | NC_GLOBAL | naming_authority | String | edu.uaf.snap |
attribute | NC_GLOBAL | Northernmost_Northing | double | 80.125 |
attribute | NC_GLOBAL | processing_level | String | This data set includes weekly (January 1954 to December 2013) and monthly (January 1850 to December 2020) midpoint historical sea ice concentration (0 - 100%) estimates at 1/4 x 1/4 degree spatial resolution for the ocean region around the state of Alaska, USA. This value-added dataset was developed by compiling the below historical data sources into spatially and temporally standardized datasets. Gaps in temporal or spatial resolutions were filled in with spatial and temporal analog month approaches. Note the monthly values from January 1954 - December 2013 are the week 2 values from the weekly time series. They are provided in the monthly time series for ease of use in monthly midpoint analyses. The January 2014 - February 2017 monthly time series data have been regridded and processed to match the January 1954 - December 2013 series from the NSIDC 0051 Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data, Version 1, which were accessed from the NSIDC website (https://nsidc.org/data/docs/daac/nsidc0051_gsfc_seaice.gd.html). The further post-processing and regridding of the NSIDC product to the extent / crs / origin / resolution of the existing data, was a non-standard process. It involved initially warping the polar stereographic data to a pacific centered WGS84 crs, converting the sea ice concentration values to points and performing a spline interpolation across the entire domain. This interpolated raster was then filled further around the land-sea divide where there was a mismatch between the NSIDC mask and the Sea Ice Atlas mask. The filling was performed by taking the average of the surrounding sea ice concentration pixels and filling the missing locations. These locations have been flagged in the source band (band 2) to keep track of what was modified from the NSIDC 0051 for this purpose. These data are a compilation of data from many sources integrated into a single gridded product. The sources of data for each grid cell have changed over the years from infrequent land/sea observations, to observationally derived charts, to satellite data for the most recent decades. Temporal and spatial gaps within observed data are filled with analog month approaches. Please note that large portions of the pre-1953, and almost all of the pre-1900 data, are either analog or interpolated data and the user is cautioned to use these data with care. The temporal and spatial inhomogeneities in the data sources that went into the construction of this dataset require that any historical analysis of the data is done with caution and an understanding of the limitations of the data. Methods of data compilation varied by data source, but included visual interpretation of hard copy map notation and legends, scanning, digitization, geo-rectification into digital geospatial products, reprojection, and also resampling into a common resolution. To standardize the data onto a common spatial grid, the resampling methodology utilized the centroid of the target 1/4 x 1/4 grid cell as the location to extract the value from the underlying data source. |
attribute | NC_GLOBAL | project | String | Historical Sea Ice Atlas |
attribute | NC_GLOBAL | publisher_email | String | janzen at aoos.org |
attribute | NC_GLOBAL | publisher_institution | String | Alaska Ocean Observing System |
attribute | NC_GLOBAL | publisher_name | String | Alaska Ocean Observing System |
attribute | NC_GLOBAL | publisher_url | String | http://www.aoos.org![]() |
attribute | NC_GLOBAL | sourceUrl | String | (local files) |
attribute | NC_GLOBAL | Southernmost_Northing | double | 40.125 |
attribute | NC_GLOBAL | standard_name_vocabulary | String | CF-12 |
attribute | NC_GLOBAL | summary | String | Data from a local source. |
attribute | NC_GLOBAL | time_coverage_end | String | 2018-12-15T12:00:00Z |
attribute | NC_GLOBAL | time_coverage_start | String | 1850-01-15T12:00:00Z |
attribute | NC_GLOBAL | title | String | Data from a local source. |
attribute | NC_GLOBAL | Westernmost_Easting | double | -179.875 |
dimension | time | double | nValues=2028, evenlySpaced=false, averageSpacing=30 days 10h 28m 43s | |
attribute | time | _ChunkSizes | uint | 1024 |
attribute | time | _CoordinateAxisType | String | Time |
attribute | time | actual_range | double | -3.7855728E9, 1.5448752E9 |
attribute | time | axis | String | T |
attribute | time | calendar | String | gregorian |
attribute | time | ioos_category | String | Time |
attribute | time | long_name | String | Time |
attribute | time | standard_name | String | time |
attribute | time | time_origin | String | 01-JAN-1970 00:00:00 |
attribute | time | units | String | seconds since 1970-01-01T00:00:00Z |
dimension | latitude | double | nValues=161, evenlySpaced=true, averageSpacing=0.25 | |
attribute | latitude | _ChunkSizes | uint | 40 |
attribute | latitude | _CoordinateAxisType | String | Lat |
attribute | latitude | actual_range | double | 40.125, 80.125 |
attribute | latitude | axis | String | Y |
attribute | latitude | ioos_category | String | Location |
attribute | latitude | long_name | String | Latitude |
attribute | latitude | standard_name | String | latitude |
attribute | latitude | units | String | degrees_north |
dimension | longitude | double | nValues=241, evenlySpaced=true, averageSpacing=0.25 | |
attribute | longitude | _ChunkSizes | uint | 60 |
attribute | longitude | _CoordinateAxisType | String | Lon |
attribute | longitude | actual_range | double | -179.875, -119.875 |
attribute | longitude | axis | String | X |
attribute | longitude | ioos_category | String | Location |
attribute | longitude | long_name | String | Longitude |
attribute | longitude | standard_name | String | longitude |
attribute | longitude | units | String | degrees_east |
variable | sic_con_pct | float | time, latitude, longitude | |
attribute | sic_con_pct | _ChunkSizes | uint | 10, 40, 60 |
attribute | sic_con_pct | _FillValue | float | -2.14748365E9 |
attribute | sic_con_pct | colorBarMaximum | double | 100.0 |
attribute | sic_con_pct | colorBarMinimum | double | 0.0 |
attribute | sic_con_pct | grid_mapping | String | crs |
attribute | sic_con_pct | ioos_category | String | Ice Distribution |
attribute | sic_con_pct | long_name | String | Sea Ice Concentration |
attribute | sic_con_pct | units | String | percent |
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.