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Evaluation of Precipitation Simulations over Thailand using a WRF Regional Climate Model
Paper Type  |
Contributed Paper |
Title |
Evaluation of Precipitation Simulations over Thailand using a WRF Regional Climate Model |
Author |
Chakrit Chotamonsak *[a], Eric P. Salathé Jr. [b], Jiemjai Kreasuwan [c] and Somporn Chantara [a] |
Email |
chakrit@chiangmai.ac.th |
|
Abstract:
The Weather Research and Forecasting (WRF) model is widely used as a regional climate model for dynamical downscaling in many regions world-wide. This study evaluates the WRF model for regional climate applications over Thailand, focusing on simulated precipitation using various convective parameterization schemes available in WRF. The NCEP/NCAR Reanalysis are used as forcing boundary data. The WRF simulations were performed at a 20-km grid spacing with an outer 60-km nest, to which the boundary forcing was applied. Experiments are presented for the year 2005 using four convective cumulus parameterization schemes, namely, BMJ (Betts-Miller-Janjic), GD (Grell-Devenyi), G3D (improved Grell-Denenyi) and KF (Kain-Fritsch) with and without nudging applied to the outermost nest. Results are evaluated both against station data and gridded observations. In general, the experiments with nudging perform better than un-nudged experiments and the BMJ cumulus scheme with nudging yields the smallest bias relative to observations. |
|
Start & End Page |
623 - 638 |
Received Date |
2011-10-24 |
Revised Date |
|
Accepted Date |
2012-02-05 |
Full Text |
Download |
Keyword |
WRF, Regional climate model, dynamical downscaling, model evaluation, convective parameterization, precipitation, Thailand |
Volume |
Vol.39 No.4 (OCTOBER 2012) |
DOI |
|
Citation |
*[a] C..C., [b] E.P.S.J., [c] J.K. and [a] S..C., Evaluation of Precipitation Simulations over Thailand using a WRF Regional Climate Model , Chiang Mai Journal of Science, 2012; 39(4): 623-638. |
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