d5ad3b51-3ea7-4f40-ac2e-b835dc95152c Scenarios Network for Alaska and Arctic Planning uaf-snap-data-tools@alaska.edu 2025-07-23T12:41:30 ISO 19115:2003/19139 1.0 3 EPSG:3338 Historical and Projected Decadal Average Monthly Snowfall Equivalent and the Ratio of Snowfall Equivalent to Precipitation 771m CMIP5/AR5/CRU TS3.1 2018-11-16 1.0.0 These files include climatological summaries of downscaled historical and projected decadal average monthly derived snow variables and summaries at 771 meter spatial resolution across Alaska. There are three types of files: 1). The historical and future snowfall water equivalent (SWE) in millimeters, produced by multiplying snow-day fraction by decadal average monthly precipitation and summing over 6 months from October to March to estimate the total SWE on April 1. 2). The historical and future ratio of SWE to total precipitation (SFEtoP) in percent. SFEtoP is calculated as (SWE / total precipitation) and also represents the six month October to March period. 3). The future difference in SWE with respect to the historical baseline (dSWE) in percent. dSWE is calculated as ((future SWE – historical SWE) / historical SWE) * 100. These data are also summary for the six month October to March period. The historical baseline period is 1970-1999, (file naming convention “H70.99”) and data are calculated from downscaled CRU TS 3.1 data. Projected variables exist for RCP 4.5 and RCP 8.5 emission scenarios and for 5 GCMs: NCAR-CCSM4, GFDL-CM3, GISS-E2-R, IPSL-CM5, and MRI-CGCM3. The 5-model mean (file naming convention "5MM") was also computed. Projections exist for three thirty-year climatologies: the 2020s (2010-2039), the 2050s (2040-2069), and the 2080s (2070-2099). The snow-day fraction data used can be found here: http://ckan.snap.uaf.edu/dataset/projected-decadal-averages-of-monthly-snow-day-fraction-771m-cmip5-ar5 http://ckan.snap.uaf.edu/dataset/historical-decadal-averages-of-monthly-snow-day-fraction-771m-cru-ts3-0-3-1 The precipitation data used can be found here: http://ckan.snap.uaf.edu/dataset/projected-monthly-and-derived-precipitation-products-771m-cmip5-ar5 http://ckan.snap.uaf.edu/dataset/historical-monthly-and-derived-precipitation-products-771m-cru-ts Note: In Littell et al. 2018, "SWE" is referred to as "SFE", and "SFEtoP" as "SFE:P" Matthew Leonawicz Michael Lindgren Tom Kurkowski John Walsh Scott Rupp Stephanie McAfee Jeremy Littell Scenarios Network for Alaska and Arctic Planning uaf-snap-data-tools@alaska.edu https://catalog.snap.uaf.edu/geonetwork/srv/api/records/d5ad3b51-3ea7-4f40-ac2e-b835dc95152c/attachments/sfe_preview.png precipitation snow snow water equivalent projected modeled CMIP5 historical 771 eng climatologyMeteorologyAtmosphere 1970-10-01 2099-03-31 -178.20 -130.00 51.20 71.40 https://data.snap.uaf.edu/data/Base/AK_771m/SWE_dSWE_SFEtoPR/ WWW:LINK-1.0-http--link Historical and Projected Decadal Average Monthly Snowfall Equivalent and the Ratio of Snowfall Equivalent to Precipitation 771m CMIP5/AR5/CRU TS3.1 URL to web-accessible folder containing downloads for this data set. https://doi.org/10.1007/s10584-010-9855-0 WWW:LINK-1.0-http--link Elsner et al., 2010: Implications of 21st century climate change for the hydrology of Washington State Publication https://doi.org/10.1002/hyp.9934 WWW:LINK-1.0-http--link McAfee et al., 2014: Statistically downscaled projections of snow/rain partitioning for Alaska Publication https://doi.org/10.1016/j.envsoft.2018.03.021 WWW:LINK-1.0-http--link Walsh et al., 2018: Downscaling of climate model output for Alaskan stakeholders Publication https://doi.org/10.3390/w10050668 WWW:LINK-1.0-http--link Littell et al., 2018: Alaska Snowpack Response to Climate Change: Statewide Snowfall Equivalent and Snowpack Water Scenarios Publication https://doi.org/10.5066/P9G6F51O WWW:LINK-1.0-http--link ScienceBase Catalog Record Collection: Historical and Projected Estimates of Snow Fraction and and the Amount of Precipitation that Likely Falls as Snow Across Alaska