A semiparametric multivariate and multisite weather generator

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.

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Copyright 2007 American Geophysical Union.


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Author Apipattanavis, S.
Podestá, G.
Rajagopalan, B.
Katz, Richard
Publisher UCAR/NCAR - Library
Publication Date 2007-11-01T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2025-07-17T16:01:04.392737
Metadata Record Identifier edu.ucar.opensky::articles:6606
Metadata Language eng; USA
Suggested Citation Apipattanavis, S., Podestá, G., Rajagopalan, B., Katz, Richard. (2007). A semiparametric multivariate and multisite weather generator. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d7v40vff. Accessed 01 August 2025.

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