Abstract
We propose a semiparametric multivariate weather generator with greater ability to reproduce the historical statistics, especially the wet and dry spells. The proposed approach has two steps: (1) a Markov Chain for generating the precipitation state (i.e., no rain, rain, or heavy rain), and (2) a k-nearest neighbor (k-NN) bootstrap resampler for generating the multivariate weather variables. The Markov Chain captures the spell statistics while the k-NN bootstrap captures the distributional and lag-dependence statistics of the weather variables. Traditional k-NN generators tend to under-simulate the wet and dry spells that are keys to watershed and agricultural modeling for water planning and management; hence the motivation for this research. We demonstrate the utility of the proposed approach and its improvement over the traditional k-NN approach through an application to daily weather data from Pergamino in the Pampas region of Argentina. We show the applicability of the proposed framework in simulating weather scenarios conditional on the seasonal climate forecast and also at multiple sites in the Pampas region.
| Original language | English (US) |
|---|---|
| Article number | W11401 |
| Journal | Water Resources Research |
| Volume | 43 |
| Issue number | 11 |
| DOIs | |
| State | Published - Nov 2007 |
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ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Chemistry
- Aquatic Science
- Water Science and Technology
Cite this
A semiparametric multivariate and multisite weather generator. / Apipattanavis, Somkiat; Podesta, Guillermo P; Rajagopalan, Balaji; Katz, Richard W.
In: Water Resources Research, Vol. 43, No. 11, W11401, 11.2007.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A semiparametric multivariate and multisite weather generator
AU - Apipattanavis, Somkiat
AU - Podesta, Guillermo P
AU - Rajagopalan, Balaji
AU - Katz, Richard W.
PY - 2007/11
Y1 - 2007/11
N2 - We propose a semiparametric multivariate weather generator with greater ability to reproduce the historical statistics, especially the wet and dry spells. The proposed approach has two steps: (1) a Markov Chain for generating the precipitation state (i.e., no rain, rain, or heavy rain), and (2) a k-nearest neighbor (k-NN) bootstrap resampler for generating the multivariate weather variables. The Markov Chain captures the spell statistics while the k-NN bootstrap captures the distributional and lag-dependence statistics of the weather variables. Traditional k-NN generators tend to under-simulate the wet and dry spells that are keys to watershed and agricultural modeling for water planning and management; hence the motivation for this research. We demonstrate the utility of the proposed approach and its improvement over the traditional k-NN approach through an application to daily weather data from Pergamino in the Pampas region of Argentina. We show the applicability of the proposed framework in simulating weather scenarios conditional on the seasonal climate forecast and also at multiple sites in the Pampas region.
AB - We propose a semiparametric multivariate weather generator with greater ability to reproduce the historical statistics, especially the wet and dry spells. The proposed approach has two steps: (1) a Markov Chain for generating the precipitation state (i.e., no rain, rain, or heavy rain), and (2) a k-nearest neighbor (k-NN) bootstrap resampler for generating the multivariate weather variables. The Markov Chain captures the spell statistics while the k-NN bootstrap captures the distributional and lag-dependence statistics of the weather variables. Traditional k-NN generators tend to under-simulate the wet and dry spells that are keys to watershed and agricultural modeling for water planning and management; hence the motivation for this research. We demonstrate the utility of the proposed approach and its improvement over the traditional k-NN approach through an application to daily weather data from Pergamino in the Pampas region of Argentina. We show the applicability of the proposed framework in simulating weather scenarios conditional on the seasonal climate forecast and also at multiple sites in the Pampas region.
UR - http://www.scopus.com/inward/record.url?scp=37549031301&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=37549031301&partnerID=8YFLogxK
U2 - 10.1029/2006WR005714
DO - 10.1029/2006WR005714
M3 - Article
VL - 43
JO - Water Resources Research
JF - Water Resources Research
SN - 0043-1397
IS - 11
M1 - W11401
ER -