Evaluation of Precipitation Simulations over Thailand using a WRF Regional Climate Model
Chakrit Chotamonsak *[a], Eric P. Salathé Jr. [b], Jiemjai Kreasuwan [c] and Somporn Chantara [a]* Author for corresponding; e-mail address: chakrit@chiangmai.ac.th
Volume: Vol.39 No.4 (OCTOBER 2012)
Research Article
DOI:
Received: 24 October 2011, Revised: -, Accepted: 5 Febuary 2012, Published: -
Citation: Chotamonsak C.., Jr. E.P.S., Kreasuwan J. and Chantara S.., Evaluation of Precipitation Simulations over Thailand using a WRF Regional Climate Model , Chiang Mai Journal of Science, 2012; 39(4): 623-638.
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.