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Wednesday, June 29 • 2:12pm - 2:30pm
High performance climate downscaling in R

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Global Climate Models (GCMs) can be used to assess the impacts of future climate change on particular regions of interest, municipalities or pieces of infrastructure. However, the coarse spatial scale of GCM grids (50km or more) can be problematic to engineers or others interested in more localized conditions. This is particularly true in areas with high topographic relief and/or substantial climate heterogeneity. A technique in climate statistics known as "downscaling" exists to map coarse scale climate quantities to finer scales.

 Two main challenges are posed to potential climate downscalers: there exist few open source implementations of proper downscaling methods and many downscaling methods necessarily require information across both time and space. This requires high computational complexity to implement and substantial computational resources to execute.

The Pacific Climate Impacts Consortium in Victoria, BC, Canada has written a high-performance implementation of the detrended quantile mapping (QDM) method for downscaling climate variables. QDM is a proven climate downscaling technique that has been shown to preserve the relative changes in both the climate means and the extremes. We will release this software named "ClimDown" to CRAN under an open source license. Using ClimDown, researchers can downscale spatially coarse global climate models to an arbitrarily fine resolution for which gridded observations exist.

Our proof-of-concept for ClimDown has been to downscale all of Canada at 10km resolution for models and scenarios from the IPCC's Coupled Model Intercomparison Project. We will present our results and performance metrics from this exercise.


Moderators
avatar for Edzer Pebesma

Edzer Pebesma

professor, University of Muenster
My research interested is spatial, temporal, and spatiotemporal data in R. I am one of the authors, and maintainer, of sp. You'll find my tutorial material at https://edzer.github.io/UseR2016/ - note that I may update it until shortly before the tutorial.

Speakers
avatar for James Hiebert

James Hiebert

University of Victoria
My background is in Computer Science and I've spent my career applying CS to the earth and ocean sciences. I have worked for NOAA on mapping the ocean floors and have worked at the Pacific Climate Impacts Consortium (University of Victoria) making climate change information relevant to decision makers.


Wednesday June 29, 2016 2:12pm - 2:30pm
SIEPR 120 366 Galvez St, Stanford, CA 94305

Attendees (50)