Historical and Projected Decadal Average Monthly Snowfall Equivalent and the Ratio of Snowfall Equivalent to Precipitation 771m CMIP5/AR5/CRU TS3.1

These files include climatological summaries of downscaled historical and projected decadal average monthly snowfall equivalent ("SWE", in millimeters), the ratio of snowfall equivalent to precipitation, and future change in snowfall for October-March at 771-meter spatial resolution across the state of Alaska.

Derived snow variables and summaries. Data are for summary October to March Alaska climatologies for:

1) historical and future snowfall equivalent ("SWE"), 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) historical and future ratio of SWE to precipitation ("SFEtoP"), SFEtoP is the ratio of October to March total SWE to October to March total Pr is calculated as total SWE/total Pr. (expressed as percent, 0-100)

3) future change in snowfall equivalent relative to historical ("dSWE"), calculated as(SWE future – SWE historical)/SWE historical

The historical reference period is 1970-1999, (file name “H70.99”), calculated from downscaled CRU TS 3.1 data

Future climatologies (both RCP 4.5 and 8.5 emissions) are for:
-2020s (2010-2039)
-2050s (2040-2069) and
-2080s (2070-2099)
for all 5 GCMs: NCAR-CCSM4, GFDL-CM3, GISS-E2-R, IPSL-CM5, and MRI-CGCM3 as well as a 5-model mean (“5MM”)

Following Elsner et al. (2010), <0.1 is rain dominated, 0.1 < SFE:P 0.4 is snow dominated. Only calculated for historical reference climatology 1970-1999 and three future climatologies: 2010-2039, 2040-2069, and 2070-2090, with each climatology representing the mean of three decadal averages from the available decadal grids.

Snow 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

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"

Data and Resources

Additional Info

Spatial resolution

771 meters

Temporal extent

Start date: January 1970

End date: December 2100

Credits

The following people worked on producing this data set:

  • Matthew Leonawicz
  • Michael Lindgren
  • Tom Kurkowski
  • John Walsh
  • Scott Rupp
  • Stephanie McAfee
  • Jeremy Littell
Field Value
Source http://data.snap.uaf.edu/data/Base/AK_771m/SWE_dSWE_SFEtoPR/
Maintainer Tom Kurkowski
Version 1.0.0
access_constraints ["Please cite: Littell, J.S.; McAfee, S.A.; Hayward, G.D.\tAlaska Snowpack Response to Climate Change: Statewide Snowfall Equivalent and Snowpack Water Scenarios. Water 2018, 10, 668.", "https://creativecommons.org/licenses/by/4.0/"]
bbox-east-long 180
bbox-north-lat 71.43067
bbox-south-lat 49.10694
bbox-west-long -180
contact-email takurkowski@alaska.edu
coupled-resource []
credits ["Matthew Leonawicz", "Michael Lindgren", "Tom Kurkowski", "John Walsh", "Scott Rupp", "Stephanie McAfee", "Jeremy Littell"]
dataset-reference-date [{"type": "creation", "value": "2018-05-16T00:00:00"}]
download-url http://data.snap.uaf.edu/data/Base/AK_771m/SWE_dSWE_SFEtoPR/
frequency-of-update asNeeded
graphic-preview-description thumbnail
graphic-preview-file pr_decadal_mean_monthly_total_mm_cru_TS31_historical_06_1950_1959_thumb_s.png
graphic-preview-type png
guid af95ff42-1b0f-48df-a286-6c896161018c
licence []
license Creative Commons Attribution 4.0
license_url http://creativecommons.org/licenses/by/4.0/
metadata-date 2018-05-31T16:33:15
metadata-language
progress onGoing
resource-type
responsible-party [{"name": "", "roles": ["pointOfContact"]}, {"name": "U.S.Geological Survey Alaska Climate Adaptation Science Center", "roles": ["principalInvestigator"]}, {"name": "Scenarios Network for Alaska and Arctic Planning (SNAP)", "roles": ["custodian"]}]
spatial {"type": "Polygon", "coordinates": [[[-180.0, 49.10694], [180.0, 49.10694], [180.0, 71.43067], [-180.0, 71.43067], [-180.0, 49.10694]]]}
spatial-data-service-type
spatial-reference-system 3338
spatial-resolution 771
spatial-resolution-units meters
spatial_harvester true
temporal-extent-begin 1970-01-15T00:00:00
temporal-extent-end 2100-12-15T11:00:00