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Alaska NHM Domain map of permanent snow and initial snowpack depths, derived from monthly-mean GCM Snow water equivalent simulations, January 1980 - October 2022
This data release contains a map of permanent snow, and initial snow-depths for use in NHM-PRMS modeling of the Alaska Domain. Data were computed from NASA's GCM NetCDF files of snow-water equivalent (SWE) monthly-mean data to arrive at values used to initialize the model runs. Grid cells reporting snow were compared to 43 years of monthly-mean NetCDF files. Those gird cells with permanent SWE values were flagged and a map made of this. The resulting data layer shows grid cells in locations of perennial snowfields found in data spanning roughly 43-years (January 1980 through October 2022). Deeper SWE depths coincide with the location of glaciers but do not cover the full extent of glaciers. These data were computed to populate a PRMS hydrologic response unit parameter value for the starting date of January 1, 1980. PRMS is a deterministic, distributed-parameter, physical-process-based modeling system developed to evaluate the response of streamflow and general basin hydrology to various combinations of climate and land use.
CONTENTS OF THIS DATA RELEASE:
1. SWE_metadata.csv = NASA snow-water equivalent product (NetCDF) metadata.
2. FLDAS_glacier_depth_19820101 1.nc = NetCDF file of grid cells showing permanent snow.
3. AK_NHM_perm_snow.zip = AK NHM shapefile of permanent snow.
4.snowpack_init.csv = Result: PRMS HRU parameter values: snowpack_init
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| bureauCode |
[ "010:12" ] |
| contactPoint |
{ "fn": "Kathryn M. Koczot", "@type": "vcard:Contact", "hasEmail": "mailto:kmkoczot@usgs.gov" } |
| description | This data release contains a map of permanent snow, and initial snow-depths for use in NHM-PRMS modeling of the Alaska Domain. Data were computed from NASA's GCM NetCDF files of snow-water equivalent (SWE) monthly-mean data to arrive at values used to initialize the model runs. Grid cells reporting snow were compared to 43 years of monthly-mean NetCDF files. Those gird cells with permanent SWE values were flagged and a map made of this. The resulting data layer shows grid cells in locations of perennial snowfields found in data spanning roughly 43-years (January 1980 through October 2022). Deeper SWE depths coincide with the location of glaciers but do not cover the full extent of glaciers. These data were computed to populate a PRMS hydrologic response unit parameter value for the starting date of January 1, 1980. PRMS is a deterministic, distributed-parameter, physical-process-based modeling system developed to evaluate the response of streamflow and general basin hydrology to various combinations of climate and land use. CONTENTS OF THIS DATA RELEASE: 1. SWE_metadata.csv = NASA snow-water equivalent product (NetCDF) metadata. 2. FLDAS_glacier_depth_19820101 1.nc = NetCDF file of grid cells showing permanent snow. 3. AK_NHM_perm_snow.zip = AK NHM shapefile of permanent snow. 4.snowpack_init.csv = Result: PRMS HRU parameter values: snowpack_init |
| distribution |
[ { "@type": "dcat:Distribution", "title": "Digital Data", "format": "XML", "accessURL": "https://doi.org/10.5066/P92VZBEV", "mediaType": "application/http", "description": "Landing page for access to the data" }, { "@type": "dcat:Distribution", "title": "Original Metadata", "format": "XML", "mediaType": "text/xml", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.64b58510d34e70357a2ae77f.xml" } ] |
| identifier | http://datainventory.doi.gov/id/dataset/USGS_64b58510d34e70357a2ae77f |
| keyword |
[ "Alaska", "British Columbian Province", "Canada", "GCM", "Global domain", "IWAA", "NASA Giovanni", "NHM", "PRMS parameter source data", "PRMS parameter values", "SWE", "Snow-cover area", "USGS:64b58510d34e70357a2ae77f", "WMA", "Yukon", "Yukon Territory", "actual evapotranspiration", "baseflow", "climatologyMeteorologyAtmosphere", "environment", "geoscientificInformation", "geospatial datasets", "glaciers", "groundwater", "hydrology", "inlandWaters", "land surface characteristics", "natural resources", "perennial snowfields", "potential evapotranspiration", "root zone soil moisture", "scientific interpretation", "scientific software", "snow and ice cover", "snow water equivalent", "snow-water equivalent", "soil-water infiltration", "solar radiation", "spatial analysis", "subsurface runoff", "surface runoff", "water resources", "watershed management" ] |
| modified | 2025-09-30T00:00:00Z |
| publisher |
{ "name": "U.S. Geological Survey", "@type": "org:Organization" } |
| spatial | -178.0337, 51.6912, -126.4846, 71.2754 |
| theme |
[ "geospatial" ] |
| title | Alaska NHM Domain map of permanent snow and initial snowpack depths, derived from monthly-mean GCM Snow water equivalent simulations, January 1980 - October 2022 |
