Summary
A statistical-dynamical downscaling procedure for global climate simulations is described. The procedure is based on the assumption that any regional climate is associated with a specific frequency distribution of classified large-scale weather situations. The frequency distributions are derived from multi-year episodes of low resolution global climate simulations. Highly resolved regional distributions of wind and temperature are calculated with a regional model for each class of large-scale weather situation. They are statistically evaluated by weighting them with the according climate-specific frequency. The procedure is exemplarily applied to the Alpine region for a global climate simulation of the present January climate.
List of Symbols
Δλ west-east mesh size in geographic coordinates
Δϕ south-north mesh size in geographic coordinates
N number of large-scale weather classes
n number of regional-scale event classes
p pressure
P probability
Ø large-scale event
ϕ regional-scale event
q v specific humidity
θ potential temperature
u west-east wind component
v south-north wind component
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Abbreviations
- AGL:
-
above ground level
- LT:
-
local time
- UTC:
-
universal time coordinated
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Frey-Buness, F., Heimann, D. & Sausen, R. A statistical-dynamical downscaling procedure for global climate simulations. Theor Appl Climatol 50, 117–131 (1995). https://doi.org/10.1007/BF00866111
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DOI: https://doi.org/10.1007/BF00866111