Validation of the WRF regional climate model over the subregions of Southeast Asia

Climatology and interannual variability

Satyaban B. Ratna, J. V. Ratnam, S. K. Behera, Fredolin Tangang @ Tajudin Mahmud, T. Yamagata

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This study investigates the capability of a regional climate model in simulating the climate variability over Southeast Asia (SE Asia). The present-day climate, covering the period 1991 to 2015, was dynamically downscaled using the Weather Research and Forecasting (WRF) model with a horizontal resolution of 27 km. The initial and boundary conditions for the WRF model is provided with the European Centre for medium-range weather forecasting (ECMWF) reanalysis (ERA-Interim) data. The model reproduced the mean precipitation climatology as well as the annual cycle. Nevertheless, the model overestimated the boreal summer precipitation over the SE Asian mainland, and underestimated the boreal winter precipitation over the Indonesian region. Model biases are associated with the bias in simulating the vertically integrated moisture fluxes. At an interannual scale, the model shows good performance over the SE Asian mainland and the Philippines in all seasons except for the boreal summer. The influence of El Niño/Southern Oscillation (ENSO) on rainfall over mainland SE Asia and the Philippines during JJA is weak, and the model successfully simulated the weak relationship realistically. In contrast, model interannual variability over the Indonesia region is good only in boreal summer and autumn seasons. This is because the model successfully simulated the significant negative correlation between rainfall and ENSO. The influence of the Indian Ocean Dipole (IOD) is seen only in the boreal autumn over the Indonesian region, and the model reproduced it reasonably well. The improvement in the representation of precipitation anomaly associated with ENSO/IOD is due to reasonably accurate simulation of large-scale circulation over SE Asia.

Original languageEnglish
Pages (from-to)263-280
Number of pages18
JournalClimate Research
Volume71
Issue number3
DOIs
Publication statusPublished - 2017

Fingerprint

Climate models
Climatology
regional climate
climatology
climate modeling
weather
Southern Oscillation
Rain
summer
autumn
Southeast Asia
Weather forecasting
precipitation (climatology)
rainfall
moisture flux
weather forecasting
Precipitation (meteorology)
climate
annual cycle
Moisture

Keywords

  • Downscaling
  • ENSO
  • IOD
  • Regional climate model
  • Southeast Asia
  • WRF

ASJC Scopus subject areas

  • Environmental Chemistry
  • Environmental Science(all)
  • Atmospheric Science

Cite this

Validation of the WRF regional climate model over the subregions of Southeast Asia : Climatology and interannual variability. / Ratna, Satyaban B.; Ratnam, J. V.; Behera, S. K.; Tangang @ Tajudin Mahmud, Fredolin; Yamagata, T.

In: Climate Research, Vol. 71, No. 3, 2017, p. 263-280.

Research output: Contribution to journalArticle

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