Simulation of surface temperature in Southeast Asia during the Southeast Asian southwest monsoon using RegCM4

Jing Xiang Chung, Sheau Tieh Ngai, Tze Wei Tay, Ju Neng Liew, Fredolin Tangang @ Tajudin Mahmud

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The performance of RegCM4 in simulating the surface temperature in Southeast Asia (SEA) during the Southeast Asian southwest monsoon using six different cumulus parameterization schemes (CPSs) was assessed in this study using the model output from the Southeast Asia Regional Climate Downscaling/ Coordinated Regional Climate Downscaling Experiment Southeast Asia (SEACLID/CORDEX-SEA) project. The simulated surface temperatures were evaluated against the surface temperature from the CRU observation dataset from year 1990 to 2008. The assessment shows that all the simulations produced an overall cold bias in SEA. The cold bias is the strongest in the mountain region of west Papua, followed by that over the north-eastern region of Thailand. Generally, the cold bias over the maritime continent is found to be much weaker compared to that of Indo-China mainland. As the bias is not unique to any simulations, the bias simulated is not very much CPSs dependence. It is also noticed that the model has the tendency to underestimate the maximum surface temperature (Tmax) explaining the systematic cold bias produced by the model. Also, the model tends to overestimate the minimum surface temperature (Tmin). The overestimation of Tmin is slightly higher over the maritime continent, explaining the weaker cold bias in surface temperature observed over that area. Through assessing the simulations bias and the simulated spatial pattern agreement, we noticed that the reasonable choice of CPS to be used has to have Emanuel set on land when the simulation of southwest monsoon surface temperature is concerned. Nevertheless, the ensemble standard deviation calculated across all the simulations reveals that th e surface temperature over SEA is less sensitive to the choice of CPS used, especially at the maritime continent. Comparatively, the surface temperature over Indo-China mainland is more sensitive to the choice of CPS used.

Original languageEnglish
Title of host publication2015 UKM FST Postgraduate Colloquium: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2015 Postgraduate Colloquium
PublisherAmerican Institute of Physics Inc.
Volume1678
ISBN (Electronic)9780735413252
DOIs
Publication statusPublished - 25 Sep 2015
Event2015 Postgraduate Colloquium of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology, UKM FST 2015 - Selangor, Malaysia
Duration: 15 Apr 201516 Apr 2015

Other

Other2015 Postgraduate Colloquium of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology, UKM FST 2015
CountryMalaysia
CitySelangor
Period15/4/1516/4/15

Fingerprint

Southeast Asia
monsoons
surface temperature
parameterization
simulation
continents
climate
China
Thailand
mountains
standard deviation
tendencies

Keywords

  • RegCM
  • Regional Climate Modeling (RCM)
  • Southeast Asia
  • southwest monsoon
  • surface temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Chung, J. X., Ngai, S. T., Tay, T. W., Liew, J. N., & Tangang @ Tajudin Mahmud, F. (2015). Simulation of surface temperature in Southeast Asia during the Southeast Asian southwest monsoon using RegCM4. In 2015 UKM FST Postgraduate Colloquium: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2015 Postgraduate Colloquium (Vol. 1678). [020011] American Institute of Physics Inc.. https://doi.org/10.1063/1.4931196

Simulation of surface temperature in Southeast Asia during the Southeast Asian southwest monsoon using RegCM4. / Chung, Jing Xiang; Ngai, Sheau Tieh; Tay, Tze Wei; Liew, Ju Neng; Tangang @ Tajudin Mahmud, Fredolin.

2015 UKM FST Postgraduate Colloquium: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2015 Postgraduate Colloquium. Vol. 1678 American Institute of Physics Inc., 2015. 020011.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Chung, JX, Ngai, ST, Tay, TW, Liew, JN & Tangang @ Tajudin Mahmud, F 2015, Simulation of surface temperature in Southeast Asia during the Southeast Asian southwest monsoon using RegCM4. in 2015 UKM FST Postgraduate Colloquium: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2015 Postgraduate Colloquium. vol. 1678, 020011, American Institute of Physics Inc., 2015 Postgraduate Colloquium of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology, UKM FST 2015, Selangor, Malaysia, 15/4/15. https://doi.org/10.1063/1.4931196
Chung JX, Ngai ST, Tay TW, Liew JN, Tangang @ Tajudin Mahmud F. Simulation of surface temperature in Southeast Asia during the Southeast Asian southwest monsoon using RegCM4. In 2015 UKM FST Postgraduate Colloquium: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2015 Postgraduate Colloquium. Vol. 1678. American Institute of Physics Inc. 2015. 020011 https://doi.org/10.1063/1.4931196
Chung, Jing Xiang ; Ngai, Sheau Tieh ; Tay, Tze Wei ; Liew, Ju Neng ; Tangang @ Tajudin Mahmud, Fredolin. / Simulation of surface temperature in Southeast Asia during the Southeast Asian southwest monsoon using RegCM4. 2015 UKM FST Postgraduate Colloquium: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2015 Postgraduate Colloquium. Vol. 1678 American Institute of Physics Inc., 2015.
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abstract = "The performance of RegCM4 in simulating the surface temperature in Southeast Asia (SEA) during the Southeast Asian southwest monsoon using six different cumulus parameterization schemes (CPSs) was assessed in this study using the model output from the Southeast Asia Regional Climate Downscaling/ Coordinated Regional Climate Downscaling Experiment Southeast Asia (SEACLID/CORDEX-SEA) project. The simulated surface temperatures were evaluated against the surface temperature from the CRU observation dataset from year 1990 to 2008. The assessment shows that all the simulations produced an overall cold bias in SEA. The cold bias is the strongest in the mountain region of west Papua, followed by that over the north-eastern region of Thailand. Generally, the cold bias over the maritime continent is found to be much weaker compared to that of Indo-China mainland. As the bias is not unique to any simulations, the bias simulated is not very much CPSs dependence. It is also noticed that the model has the tendency to underestimate the maximum surface temperature (Tmax) explaining the systematic cold bias produced by the model. Also, the model tends to overestimate the minimum surface temperature (Tmin). The overestimation of Tmin is slightly higher over the maritime continent, explaining the weaker cold bias in surface temperature observed over that area. Through assessing the simulations bias and the simulated spatial pattern agreement, we noticed that the reasonable choice of CPS to be used has to have Emanuel set on land when the simulation of southwest monsoon surface temperature is concerned. Nevertheless, the ensemble standard deviation calculated across all the simulations reveals that th e surface temperature over SEA is less sensitive to the choice of CPS used, especially at the maritime continent. Comparatively, the surface temperature over Indo-China mainland is more sensitive to the choice of CPS used.",
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