Alaskan River Ice Dataset

1. Summary This data is public for a manuscript under review. 2. File list AlaskaIceResultsv1 (.shp, .dbf, .prj, .shx) River ice breakup, freeze-up, duration, and uncertainty observations for Alaskan rivers wider than 150m from 2000-2018 CanadaValidationResultsv1 (.shp, .dbf, .prj, .shx) River ice breakup, freeze-up, duration, and uncertainty observations for reaches located near Canadian WSC gages from 2000-2018 validationLocationsUSGS (.shp, .dbf, .prj, .shx) Locations of USGS gages used for ice flag validation validationLocationsWSC (.shp, .dbf, .prj, .shx) Locations of WSC gages used for ice flag validation validationLocationsNWS (.shp, .dbf, .prj, .shx) Locations of NWS first ice and breakup observations AlaskanRegions (.shp, .dbf, .prj, .shx) Regions used for regional Alaskan analysis 3. Attribute description AlaskaIceResultsv1 & CanadaValidationResultsv1 id: Alaskan or Canadian reach ID widthMd: Median reach width (m) derived from the GRWL vector product (Allen & Pavelsky, 2018) elevMed (only AlaskaIceResultsv1): Median reach elevation (m) derived from the GRWL vector product (Allen & Pavelsky, 2018) region (only AlaskaIceResultsv1): The region of AK in which the reach resides. iceYear: The ice year of the observation based upon a year starting August 1st and ending July 31st. For example, ice year 2001 refers to Aug 1st 2000 – July 31st 2001. duration: Total ice duration (days). 0 = no duration data rdThresh: Reach-specific red band threshold used to distinguish between ice and water pixels observing the reach fuDate/buDate: Freeze-up/breakup date. Blank = no freeze-up/breakup date fuIcDOY/buIcDOY: Freeze-up/breakup day of the ice year. 0 = no freeze-up/breakup date fuUncrt/buUncrt: Uncertainty in freeze-up/breakup date. 0 = no freeze-up/breakup date fUncertF/bUncertF: Uncertainty flag for freeze-up/breakup dates. “good” = uncertainty <= ±10 days “flag” = uncertainty > ±10 days Blank = no freeze-up/breakup date validationLocationsUSGS & validationLocationsWSC id: Alaskan or Canadian reach ID country: USA or Canada org: United States Geological Survey (USGS) or Water Survey of Canada (WSC) stationNum: Gage station number stationNm: Gage station name yearFrom: Year that discharge data collection begun at the station yearTo: Year that discharge data collection ended at the station validationLocationsNWS id: Alaskan reach ID fnLctn: Name of NWS location nrCnfln: Is the observation near a confluence (y/n) mltChnn: Is the observation on a multichannel river (y/n) nYersFU: Number of years of NWS first-ice dates compared against MODIS freeze-up dates during the validation process nYersBU: Number of years of NWS breakup dates compared against MODIS breakup dates during the validation process AlaskanRegions region: Alaskan region name