Projected Mean Surface Downwelling Shortwave Radiation (RSDS) AR4 B1/A1B/A2 - Monthly

This set of files constitutes a time series of downscaled projections of Surface Downwelling Shortwave Radiation (RSDS, units=MJ/m2/day) at a 1km spatial scale for the period 2001-2100 at a monthly time-step.

The spatial extent includes Alaska, the Yukon Territories, and Northern British Columbia.

This data has been prepared as model input for the Integrated Ecosystem Model (IEM). There can be errors or serious limitations to the application of this data to other analyses. The data constitute the result of a downscaling procedure using the Coupled Model Intercomparison Project 3 (CMIP3) B1/A1B/A2 Scenarios (2001-2100) monthly time series and CRU TS2.0 (1961-1990,10 min spatial resolution) global climatology data.

Scenarios: B1, A1B, A2

Centers, Model Names, Versions, Acronyms, and original spatial resolution:

Canadian Centre for Climate Modelling and Analysis, General Circulation Model
version 3.1 - t47 (CCMA), cccma cgcm31, ~3.75 degrees

Max Planck Institute for Meteorology, European Centre Hamburg Model 5 (ECHAM5), mpi echam5, ~1.875 degrees

Methods of creating downscaled surface downwelling shortwave radiation data:

  1. Input baseline climatology girr data were calculated using an equation from Allen et al. (1998) at a monthly timestep, which is used to represent the historical period rsds data at 1km spatial scale.

  2. Climate of the 20th Century (20c3m) cloud cover data from each model for the period 1961-1990 are used to create a climatology at the input resolution of the given model.

  3. The above 1961-1990 monthly cloud cover climatology series is used to calculate the proportional anomalies for the future time series (A1B) cloud cover data, used as input to delta downscaling procedure.

  4. Data limitations at the downscaled resolution required the calculation of cloud cover from sunshine percent from the CRU TS2.0 1961-1990 climatology data to use as a baseline for downscaling.

  5. The anomalies calculated above are then interpolated using a spline procedure to a 10min spatial scale grid.

  6. The proportional anomalies are then multiplied by the baseline 10min calculated cloud cover 1961-1990 grids to produce a downscaled cloud cover time series.

  7. The downscaled cloud cover timeseries is then used to calculate nirr (rsds) from the girr and downscaled cloud cover using the following equation:

    nirr = monthly_girr * (0.251 + (0.509 * (1.0 - cloud_cover/100)))

These files are bias corrected and downscaled via the delta method using Climatic Research Unit (CRU) CRU TS 2.0 1961-1990 Climatology data (10min spatial resolution) as baseline climate.

Data and Resources

Additional Info

Spatial resolution

1000 meters

Temporal extent

Start date: January 2001

End date: December 2100


The following people worked on producing this data set:

  • Michael Lindgren
  • Stephanie McAfee
  • Tom Kurkowski
  • This research is funded by the Arctic Landscape Conservation Cooperative, Western Alaska Landscape Conservation Cooperative, and Northwest Boreal Landscape Conservation Cooperative (LCCs) and the Alaska Climate Science Center.
Field Value
Maintainer Tom Kurkowski
Version 1.0.0
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credits ["Michael Lindgren", "Stephanie McAfee", "Tom Kurkowski", "This research is funded by the Arctic Landscape Conservation Cooperative, Western Alaska Landscape Conservation Cooperative, and Northwest Boreal Landscape Conservation Cooperative (LCCs) and the Alaska Climate Science Center."]
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license Creative Commons Attribution 4.0
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temporal-extent-begin 2001-01-15T00:00:00
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