Alaskan River Ice Dataset

<strong>1. Summary</strong> This data is public for a manuscript under review. <strong>2. File list</strong> 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 <strong>3. Attribute description</strong> <em>AlaskaIceResultsv1 </em>&amp; <em>CanadaValidationResultsv1</em> <strong>id:</strong> Alaskan or Canadian reach ID <strong>widthMd:</strong> Median reach width (m) derived from the GRWL vector product (Allen &amp; Pavelsky, 2018) <strong>elevMed </strong>(only <em>AlaskaIceResultsv1</em>)<strong>:</strong> Median reach elevation (m) derived from the GRWL vector product (Allen &amp; Pavelsky, 2018) <strong>region </strong>(only <em>AlaskaIceResultsv1</em>)<strong>:</strong> The region of AK in which the reach resides. <strong>iceYear:</strong> The ice year of the observation based upon a year starting August 1^st and ending July 31^st. For example, ice year 2001 refers to Aug 1^st2000 – July 31^st 2001. <strong>duration:</strong> Total ice duration (days). 0 = no duration data <strong>rdThresh:</strong> Reach-specific red band threshold used to distinguish between ice and water pixels observing the reach <strong>fuDate/buDate:</strong> Freeze-up/breakup date. Blank = no freeze-up/breakup date <strong>fuIcDOY/buIcDOY:</strong> Freeze-up/breakup day of the ice year. 0 = no freeze-up/breakup date <strong>fuUncrt/buUncrt:</strong> Uncertainty in freeze-up/breakup date. 0 = no freeze-up/breakup date <strong>fUncertF/bUncertF: </strong>Uncertainty flag for freeze-up/breakup dates. “good” = uncertainty &lt;= ±10 days “flag” = uncertainty &gt; ±10 days Blank = no freeze-up/breakup date <em>validationLocationsUSGS </em>&amp; <em>validationLocationsWSC</em> <strong>id: </strong>Alaskan or Canadian reach ID <strong>country:</strong> USA or Canada <strong>org:</strong> United States Geological Survey (USGS) or Water Survey of Canada (WSC) <strong>stationNum:</strong> Gage station number <strong>stationNm:</strong> Gage station name <strong>yearFrom:</strong> Year that discharge data collection begun at the station <strong>yearTo:</strong> Year that discharge data collection ended at the station <em>validationLocationsNWS</em> <strong>id</strong>: Alaskan reach ID <strong>fnLctn</strong>: Name of NWS location <strong>nrCnfln</strong>: Is the observation near a confluence (y/n) <strong>mltChnn</strong>: Is the observation on a multichannel river (y/n) <strong>nYersFU</strong>: Number of years of NWS first-ice dates compared against MODIS freeze-up dates during the validation process <strong>nYersBU</strong>: Number of years of NWS breakup dates compared against MODIS breakup dates during the validation process <em>AlaskanRegions</em> <strong>region: </strong>Alaskan region name