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Theoretical and Applied Climatology

, Volume 113, Issue 1–2, pp 289–304 | Cite as

Regional mean and variability characteristics of temperature and precipitation over Thailand in 1961–2000 by a regional climate model and their evaluation

  • Kritanai Torsri
  • Mega Octaviani
  • Kasemsan ManomaiphiboonEmail author
  • Sirintornthep Towprayoon
Original Paper

Abstract

This study presents the characterization of regional means and variability of temperature and precipitation in 1961–2000 for Thailand using regional climate model RegCM3. Two fine-resolution (20 km) simulations forced by ERA-40 reanalysis data were performed, with the default land covers and with a land-cover modification strategy suggested by a previous work. The strategy was shown to substantially alleviate the problem of systematic underestimation of temperature given by the default simulation, for most part of Thailand in both dry and wet seasons. The degree of bias in precipitation tends to vary differently in every sub-region and season considered. The patterns of seasonal variation of both climatic variables are acceptably reproduced. Simulated 850-hPa winds have general agreement with those of ERA-40, but wind speed is overestimated over the Gulf of Thailand during the dry months, potentially bringing excessive moisture to and causing more rain than actual in the south. Long-term trends in temperature are reasonably predicted by the model while those in observed and simulated precipitations for upper Thailand are in the opposite directions. Apart from the conventional methods used in characterization, spectral decomposition using Kolmogorov–Zurbenko filters was applied to inspect the model’s capability of accounting for variability (here, in terms of variance) in both climatic variables on three temporal scales (short term, seasonal, and long term). The model was found to closely estimate the total variances in the original time series and fairly predict the relative variance contributions on all temporal scales. The latter finding is in line with the results from an additional spectral coherence analysis. Overall, the model was shown to be acceptably adequate for use in support of further climate studies for Thailand, and its evident strength is the capability of reproducing seasonal characteristics and, to a lesser degree, trends.

Keywords

Regional Climate Model Original Time Series Coherency Spectrum Community Climate Model Version Thai Meteorological Department 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors sincerely thank the Thai Meteorological Department for the observation data, the Abdus Salam ICTP for the availability of RegCM3 and its user support, and the ECMWF for the ERA-40 reanalysis data. We thank Dr. Gao Xuejie (China Meteorological Administration), Dr. Robert H. B. Exell (JGSEE), Dr. Atsamol Limsakul (Department of Environmental Quality Promotion), and Dr. Jerasorn Santisirisomboon (Ramkhamhaeng University) for their useful comments given to the study. We also thank members at the JGSEE Computational Laboratory (Bang Khun Tien Campus) for their general assistance. This work was supported by the Joint Graduate School of Energy and Environment, the Postgraduate Education and Research Development Office (under grant No. JGSEE/PROJECT/002-2011), the Thailand Research Fund (under grants No. RDG5030034 and RDG5050016), and the Asahi Glass Foundation.

Supplementary material

704_2012_782_MOESM1_ESM.doc (1.2 mb)
Supplementary material (DOC 1245 kb)

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Copyright information

© Springer-Verlag Wien 2012

Authors and Affiliations

  • Kritanai Torsri
    • 1
    • 2
  • Mega Octaviani
    • 1
    • 2
  • Kasemsan Manomaiphiboon
    • 1
    • 2
    Email author
  • Sirintornthep Towprayoon
    • 1
    • 2
  1. 1.The Joint Graduate School of Energy and Environment (JGSEE)King Mongkut’s University of Technology Thonburi (KMUTT)BangkokThailand
  2. 2.Center for Energy Technology and Environment, Ministry of EducationBangkokThailand

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