Sensitivity of temperature to physical parameterization schemes of RegCM4 over the CORDEX-Southeast Asia region

F. T. Cruz, G. T. Narisma, J. B. Dado, P. Singhruck, Fredolin Tangang @ Tajudin Mahmud, U. A. Linarka, T. Wati, Ju Neng Liew, T. Phan-Van, T. Ngo-Duc, J. Santisirisomboon, D. Gunawan, E. Aldrian

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Abstract

This study examines the simulated temperature over Southeast Asia (SEA) using the Regional Climate Model version 4.3 (RegCM4.3), and its sensitivity to selected cumulus and ocean surface flux schemes. Model simulations were conducted for the SEA domain at 36km spatial resolution for the period of 1989-2008, as part of the Southeast Asia Regional Climate Downscaling/Coordinated Regional Climate Downscaling Experiment-Southeast Asia (SEACLID/CORDEX-Southeast Asia) project. A total of 18 sensitivity experiments were conducted with a combination of six cumulus parameterization schemes and three ocean surface flux schemes. The model's skill in representing mean, maximum and minimum temperatures is evaluated against observed gridded data sets. Results indicate a predominant cold bias in all simulations, particularly over mainland SEA (Indochina) during the season of December to February. Nevertheless, the seasonal correlation is highest over this region. The cold bias of the model is also evident in the temperature distributions, such that there are more cold months than observed, which may be associated with the underestimation of the daily maximum temperature. A few simulations also reveal a warm bias over some areas in the Maritime Continent. Further examination shows that both radiative and surface fluxes influence the simulated temperature, which may also have effects that partially offset each other in some areas. Comparison of the sensitivity experiments reveals differences in model performance, and underlines the importance in choosing the appropriate configuration for RegCM4.3 before it is used to downscale climate projections, particularly for the SEA region. This study also shows a strong influence of the choice of cumulus scheme on temperature. Based on performance metrics for temperature among the schemes tested, the Massachusetts Institute of Technology (MIT) Emanuel cumulus scheme and the Biosphere-Atmosphere Transfer Scheme version 1e (BATS1e) ocean surface flux scheme can be used in future simulations for the region.

Original languageEnglish
JournalInternational Journal of Climatology
DOIs
Publication statusAccepted/In press - 2017

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parameterization
surface flux
cumulus
regional climate
temperature
sea surface
downscaling
simulation
climate modeling
experiment
Southeast Asia
biosphere
spatial resolution
atmosphere
climate
cold

Keywords

  • CORDEX
  • Model evaluation
  • RegCM4
  • Southeast Asia
  • Temperature

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Sensitivity of temperature to physical parameterization schemes of RegCM4 over the CORDEX-Southeast Asia region. / Cruz, F. T.; Narisma, G. T.; Dado, J. B.; Singhruck, P.; Tangang @ Tajudin Mahmud, Fredolin; Linarka, U. A.; Wati, T.; Liew, Ju Neng; Phan-Van, T.; Ngo-Duc, T.; Santisirisomboon, J.; Gunawan, D.; Aldrian, E.

In: International Journal of Climatology, 2017.

Research output: Contribution to journalArticle

Cruz, FT, Narisma, GT, Dado, JB, Singhruck, P, Tangang @ Tajudin Mahmud, F, Linarka, UA, Wati, T, Liew, JN, Phan-Van, T, Ngo-Duc, T, Santisirisomboon, J, Gunawan, D & Aldrian, E 2017, 'Sensitivity of temperature to physical parameterization schemes of RegCM4 over the CORDEX-Southeast Asia region', International Journal of Climatology. https://doi.org/10.1002/joc.5151
Cruz, F. T. ; Narisma, G. T. ; Dado, J. B. ; Singhruck, P. ; Tangang @ Tajudin Mahmud, Fredolin ; Linarka, U. A. ; Wati, T. ; Liew, Ju Neng ; Phan-Van, T. ; Ngo-Duc, T. ; Santisirisomboon, J. ; Gunawan, D. ; Aldrian, E. / Sensitivity of temperature to physical parameterization schemes of RegCM4 over the CORDEX-Southeast Asia region. In: International Journal of Climatology. 2017.
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abstract = "This study examines the simulated temperature over Southeast Asia (SEA) using the Regional Climate Model version 4.3 (RegCM4.3), and its sensitivity to selected cumulus and ocean surface flux schemes. Model simulations were conducted for the SEA domain at 36km spatial resolution for the period of 1989-2008, as part of the Southeast Asia Regional Climate Downscaling/Coordinated Regional Climate Downscaling Experiment-Southeast Asia (SEACLID/CORDEX-Southeast Asia) project. A total of 18 sensitivity experiments were conducted with a combination of six cumulus parameterization schemes and three ocean surface flux schemes. The model's skill in representing mean, maximum and minimum temperatures is evaluated against observed gridded data sets. Results indicate a predominant cold bias in all simulations, particularly over mainland SEA (Indochina) during the season of December to February. Nevertheless, the seasonal correlation is highest over this region. The cold bias of the model is also evident in the temperature distributions, such that there are more cold months than observed, which may be associated with the underestimation of the daily maximum temperature. A few simulations also reveal a warm bias over some areas in the Maritime Continent. Further examination shows that both radiative and surface fluxes influence the simulated temperature, which may also have effects that partially offset each other in some areas. Comparison of the sensitivity experiments reveals differences in model performance, and underlines the importance in choosing the appropriate configuration for RegCM4.3 before it is used to downscale climate projections, particularly for the SEA region. This study also shows a strong influence of the choice of cumulus scheme on temperature. Based on performance metrics for temperature among the schemes tested, the Massachusetts Institute of Technology (MIT) Emanuel cumulus scheme and the Biosphere-Atmosphere Transfer Scheme version 1e (BATS1e) ocean surface flux scheme can be used in future simulations for the region.",
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T1 - Sensitivity of temperature to physical parameterization schemes of RegCM4 over the CORDEX-Southeast Asia region

AU - Cruz, F. T.

AU - Narisma, G. T.

AU - Dado, J. B.

AU - Singhruck, P.

AU - Tangang @ Tajudin Mahmud, Fredolin

AU - Linarka, U. A.

AU - Wati, T.

AU - Liew, Ju Neng

AU - Phan-Van, T.

AU - Ngo-Duc, T.

AU - Santisirisomboon, J.

AU - Gunawan, D.

AU - Aldrian, E.

PY - 2017

Y1 - 2017

N2 - This study examines the simulated temperature over Southeast Asia (SEA) using the Regional Climate Model version 4.3 (RegCM4.3), and its sensitivity to selected cumulus and ocean surface flux schemes. Model simulations were conducted for the SEA domain at 36km spatial resolution for the period of 1989-2008, as part of the Southeast Asia Regional Climate Downscaling/Coordinated Regional Climate Downscaling Experiment-Southeast Asia (SEACLID/CORDEX-Southeast Asia) project. A total of 18 sensitivity experiments were conducted with a combination of six cumulus parameterization schemes and three ocean surface flux schemes. The model's skill in representing mean, maximum and minimum temperatures is evaluated against observed gridded data sets. Results indicate a predominant cold bias in all simulations, particularly over mainland SEA (Indochina) during the season of December to February. Nevertheless, the seasonal correlation is highest over this region. The cold bias of the model is also evident in the temperature distributions, such that there are more cold months than observed, which may be associated with the underestimation of the daily maximum temperature. A few simulations also reveal a warm bias over some areas in the Maritime Continent. Further examination shows that both radiative and surface fluxes influence the simulated temperature, which may also have effects that partially offset each other in some areas. Comparison of the sensitivity experiments reveals differences in model performance, and underlines the importance in choosing the appropriate configuration for RegCM4.3 before it is used to downscale climate projections, particularly for the SEA region. This study also shows a strong influence of the choice of cumulus scheme on temperature. Based on performance metrics for temperature among the schemes tested, the Massachusetts Institute of Technology (MIT) Emanuel cumulus scheme and the Biosphere-Atmosphere Transfer Scheme version 1e (BATS1e) ocean surface flux scheme can be used in future simulations for the region.

AB - This study examines the simulated temperature over Southeast Asia (SEA) using the Regional Climate Model version 4.3 (RegCM4.3), and its sensitivity to selected cumulus and ocean surface flux schemes. Model simulations were conducted for the SEA domain at 36km spatial resolution for the period of 1989-2008, as part of the Southeast Asia Regional Climate Downscaling/Coordinated Regional Climate Downscaling Experiment-Southeast Asia (SEACLID/CORDEX-Southeast Asia) project. A total of 18 sensitivity experiments were conducted with a combination of six cumulus parameterization schemes and three ocean surface flux schemes. The model's skill in representing mean, maximum and minimum temperatures is evaluated against observed gridded data sets. Results indicate a predominant cold bias in all simulations, particularly over mainland SEA (Indochina) during the season of December to February. Nevertheless, the seasonal correlation is highest over this region. The cold bias of the model is also evident in the temperature distributions, such that there are more cold months than observed, which may be associated with the underestimation of the daily maximum temperature. A few simulations also reveal a warm bias over some areas in the Maritime Continent. Further examination shows that both radiative and surface fluxes influence the simulated temperature, which may also have effects that partially offset each other in some areas. Comparison of the sensitivity experiments reveals differences in model performance, and underlines the importance in choosing the appropriate configuration for RegCM4.3 before it is used to downscale climate projections, particularly for the SEA region. This study also shows a strong influence of the choice of cumulus scheme on temperature. Based on performance metrics for temperature among the schemes tested, the Massachusetts Institute of Technology (MIT) Emanuel cumulus scheme and the Biosphere-Atmosphere Transfer Scheme version 1e (BATS1e) ocean surface flux scheme can be used in future simulations for the region.

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KW - Model evaluation

KW - RegCM4

KW - Southeast Asia

KW - Temperature

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