Performance evaluation of RegCM4 in simulating extreme rainfall and temperature indices over the CORDEX-Southeast Asia region

Thanh Ngo-Duc, Fredolin Tangang @ Tajudin Mahmud, Jerasorn Santisirisomboon, Faye Cruz, Long Trinh-Tuan, Thanh Nguyen-Xuan, Tan Phan-Van, Ju Neng Liew, Gemma Narisma, Patama Singhruck, Dodo Gunawan, Edvin Aldrian

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

In this study, simulations over Southeast Asia (15°S-40°N, 80°-145°E) at 36km resolution were conducted for the period 1989-2007 using the Regional Climate Model version 4.3 (RegCM4.3) under the framework of the Southeast Asia Regional Climate Downscaling/Coordinated Regional Climate Downscaling Experiment - Southeast Asia (or SEACLID/CORDEX-SEA) project. Forced by the European Centre for Medium-Range Weather Forecasts (ECMWF) Interim Reanalysis (ERA-Interim), 18 experiments were carried out using different combinations of cumulus parameterization and ocean flux schemes. Twelve extreme indices for both rainfall and temperature were estimated from the model output. A statistical omega index was used to measure the degree of similarity among the 18 experiments in phase and shape. The results showed relatively high similarities among the experiments over mainland Asia compared to those over the Maritime Continent for both seasonal and inter-annual variability. The extreme rainfall indices had a lower omega compared to that of temperature. Observed daily rainfall and temperature data at 52 meteorological stations over the SEA region were used to validate the simulated extreme indices. The results showed that extreme temperature indices were generally underestimated across the region. Systematic biases for each simulated rainfall index were also identified. A score ranking system was established to compare the relative performance of the 18 experiments over the 52 selected stations objectively. It was shown that the experiments with the Massachusetts Institute of Technology (MIT)-Emanuel scheme performed relatively better than the other convective schemes. The combination of the MIT-Emanuel convective scheme with the Biosphere-Atmosphere Transfer scheme (BATS1e) ocean flux scheme produced the best performance.

Original languageEnglish
JournalInternational Journal of Climatology
DOIs
Publication statusAccepted/In press - 2016

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rainfall
regional climate
experiment
temperature
downscaling
ocean
cumulus
biosphere
ranking
index
evaluation
Southeast Asia
climate modeling
parameterization
weather
atmosphere
simulation
station

Keywords

  • CORDEX
  • Dynamical downscaling
  • Extreme climate index
  • RegCM
  • Southeast Asia

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Performance evaluation of RegCM4 in simulating extreme rainfall and temperature indices over the CORDEX-Southeast Asia region. / Ngo-Duc, Thanh; Tangang @ Tajudin Mahmud, Fredolin; Santisirisomboon, Jerasorn; Cruz, Faye; Trinh-Tuan, Long; Nguyen-Xuan, Thanh; Phan-Van, Tan; Liew, Ju Neng; Narisma, Gemma; Singhruck, Patama; Gunawan, Dodo; Aldrian, Edvin.

In: International Journal of Climatology, 2016.

Research output: Contribution to journalArticle

Ngo-Duc, Thanh ; Tangang @ Tajudin Mahmud, Fredolin ; Santisirisomboon, Jerasorn ; Cruz, Faye ; Trinh-Tuan, Long ; Nguyen-Xuan, Thanh ; Phan-Van, Tan ; Liew, Ju Neng ; Narisma, Gemma ; Singhruck, Patama ; Gunawan, Dodo ; Aldrian, Edvin. / Performance evaluation of RegCM4 in simulating extreme rainfall and temperature indices over the CORDEX-Southeast Asia region. In: International Journal of Climatology. 2016.
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abstract = "In this study, simulations over Southeast Asia (15°S-40°N, 80°-145°E) at 36km resolution were conducted for the period 1989-2007 using the Regional Climate Model version 4.3 (RegCM4.3) under the framework of the Southeast Asia Regional Climate Downscaling/Coordinated Regional Climate Downscaling Experiment - Southeast Asia (or SEACLID/CORDEX-SEA) project. Forced by the European Centre for Medium-Range Weather Forecasts (ECMWF) Interim Reanalysis (ERA-Interim), 18 experiments were carried out using different combinations of cumulus parameterization and ocean flux schemes. Twelve extreme indices for both rainfall and temperature were estimated from the model output. A statistical omega index was used to measure the degree of similarity among the 18 experiments in phase and shape. The results showed relatively high similarities among the experiments over mainland Asia compared to those over the Maritime Continent for both seasonal and inter-annual variability. The extreme rainfall indices had a lower omega compared to that of temperature. Observed daily rainfall and temperature data at 52 meteorological stations over the SEA region were used to validate the simulated extreme indices. The results showed that extreme temperature indices were generally underestimated across the region. Systematic biases for each simulated rainfall index were also identified. A score ranking system was established to compare the relative performance of the 18 experiments over the 52 selected stations objectively. It was shown that the experiments with the Massachusetts Institute of Technology (MIT)-Emanuel scheme performed relatively better than the other convective schemes. The combination of the MIT-Emanuel convective scheme with the Biosphere-Atmosphere Transfer scheme (BATS1e) ocean flux scheme produced the best performance.",
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AU - Ngo-Duc, Thanh

AU - Tangang @ Tajudin Mahmud, Fredolin

AU - Santisirisomboon, Jerasorn

AU - Cruz, Faye

AU - Trinh-Tuan, Long

AU - Nguyen-Xuan, Thanh

AU - Phan-Van, Tan

AU - Liew, Ju Neng

AU - Narisma, Gemma

AU - Singhruck, Patama

AU - Gunawan, Dodo

AU - Aldrian, Edvin

PY - 2016

Y1 - 2016

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AB - In this study, simulations over Southeast Asia (15°S-40°N, 80°-145°E) at 36km resolution were conducted for the period 1989-2007 using the Regional Climate Model version 4.3 (RegCM4.3) under the framework of the Southeast Asia Regional Climate Downscaling/Coordinated Regional Climate Downscaling Experiment - Southeast Asia (or SEACLID/CORDEX-SEA) project. Forced by the European Centre for Medium-Range Weather Forecasts (ECMWF) Interim Reanalysis (ERA-Interim), 18 experiments were carried out using different combinations of cumulus parameterization and ocean flux schemes. Twelve extreme indices for both rainfall and temperature were estimated from the model output. A statistical omega index was used to measure the degree of similarity among the 18 experiments in phase and shape. The results showed relatively high similarities among the experiments over mainland Asia compared to those over the Maritime Continent for both seasonal and inter-annual variability. The extreme rainfall indices had a lower omega compared to that of temperature. Observed daily rainfall and temperature data at 52 meteorological stations over the SEA region were used to validate the simulated extreme indices. The results showed that extreme temperature indices were generally underestimated across the region. Systematic biases for each simulated rainfall index were also identified. A score ranking system was established to compare the relative performance of the 18 experiments over the 52 selected stations objectively. It was shown that the experiments with the Massachusetts Institute of Technology (MIT)-Emanuel scheme performed relatively better than the other convective schemes. The combination of the MIT-Emanuel convective scheme with the Biosphere-Atmosphere Transfer scheme (BATS1e) ocean flux scheme produced the best performance.

KW - CORDEX

KW - Dynamical downscaling

KW - Extreme climate index

KW - RegCM

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