About SNAP Data

Customized climate data

SNAP produces downscaled, historical and projected climate data for sub-Arctic and Arctic regions of Alaska and Canada. We also share other types of project-specific data that cover much larger regions.

We choose the highest quality climate data for our region, rigorously evaluate model output, and downscale only the best models for use in other applications.

  • Downscaled projected data come from one of 5 top ranked global circulation models or are calculated as a 5-model average
  • Each model has 3 versions from one of 3 climate scenarios
  • Climate datasets include daily, monthly, monthly decadal averages, or specific seasonal average

Learn more about our data sources, model selection, and downscaling processes.

Data categories

  • Observed Historical: Variables are directly observed in the past and then assembled into a coherent gridded dataset. Example: downscaled CRU time series 1901–2009
  • Modeled Historical: Variables are modeled over a historical (past) time period. Example: historical (1850–2005) runs of GCMs
  • Modeled Projected: Variables are modeled over one or more future time periods. Outputs (projections) also include several possible pathways (scenarios). Example: projected (2006–2100) runs of GCMs and their respective RCPs

Model term definitions

CMIP Phase 3 (CMIP3)

  • Outputs from the IPCC’s Fourth Assessment Report (AR4). SNAP uses the first ensemble model run.
  • Scenarios: SRES 20C3m, B1, A1B, A2 where SRES = Special Report on Emissions Scenarios; B1, A1B, A2 = low, middle, high; 20c3m = 20th century

CMIP Phase 5 (CMIP5)

  • Outputs from the IPCC Fifth Assessment Report (AR5). SNAP uses the first ensemble model run.
  • Scenarios: Historical and RCPs 4.5, 6.0, 8.5 where RCP = Representative Concentration Pathways; 4.5, 6.0, 8.5 = low, middle, high

All of our data are freely and publicly available

Do you have expertise in GIS or programming? Our datasets include:

  • Historical downscaled data
  • Projected downscaled data
  • Derived products for Alaska and parts of Canada, including descriptions and metadata

Assistance for data users

Are you looking for specific data, or are you unsure which of our datasets are best for your purposes? We may be able to help. However, because we are a grant-funded research group, more complex projects require us to seek support for our programmers, analysts, and faculty.

Please contact us if you wish to use our data for commercial purposes.