t - Regional Climate Group

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Precipitation amount processes Daily precipitation amounts are typically strongly skewed to the right. The simplest reasonable model is the exponential distribution, as it requires specification of only one parameter, μ, and whose probability density function is: f(x) = 1 μ ⎡− x exp⎢ ⎣ μ The two-parameter gamma distribution is another popular choice, defined by the shape α and scale parameter β: f(x) = ⎤ ⎥ ⎦ α-1 ( ) [ ] x β exp - βΓ( α) x β Most weather generators make the assumption that precipitation amounts on successive wet days are independent. Göteborg University http://www.gvc2.gu.se/rcg Regional Climate Group 30
Precipitation amount processes (cont.) January precipitation at Ithaca, New York 1900- 1998 represented by three pdfs: • exponential •gamma • mixed exponential Source: Wilks and Wilby (1999) Göteborg University http://www.gvc2.gu.se/rcg Regional Climate Group 31
Page 1 and 2: Weather Generator Downscaling Summe
Page 3 and 4: Acknowledgement • Some of the OHs
Page 5 and 6: How to build the statistical model
Page 7 and 8: Statistical downscaling: Reproducti
Page 9 and 10: Statistical downscaling: Reproducti
Page 11 and 12: A successful statistical downscalin
Page 13 and 14: Differences between real world and
Page 15 and 16: Transfer Functions Area Grid Box Se
Page 17 and 18: Weather Typing Fundamental Assumpti
Page 19 and 20: Example 1: cont…… How to quanti
Page 21 and 22: General categories of methodologies
Page 23 and 24: The key problem->why WG Output of G
Page 25 and 26: Matching the scales: two common app
Page 27 and 28: Key publications in the development
Page 29: Precipitation occurrence processes
Page 33 and 34: Other meteorological variables Cond
Page 35 and 36: WG type I: Markov chain (transition
Page 37 and 38: The Richardson type WG Precipitatio
Page 39 and 40: One application of WG: Create data
Page 41 and 42: Statistical spatial downscaling Sou
Page 43 and 44: Weather Generators Fundamental Assu
Page 45 and 46: NCC/RCG-WG • Version 1: released
Page 47 and 48: Application of NCC/RCG-WG for China
Page 49 and 50: Two examples Beijing Haike Götebor
Page 51 and 52: Regional distribution of GAMMA para
Page 53 and 54: Simulated and observed monthly mean
Page 55: Suggested Further Readings • IPCC

t - Regional Climate Group

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