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Improving the Northeast Asian monsoon simulation : Remote impact of tropical hating bias correction

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Frame of Image ment is carried out in which the GCM diabatic heating is adjusted toward more realistic values in the tropics. It is found that the seasonal mean NEAM circulation and rainfall are improved in the GCM. This can be attributed to the reduced positive heating bias in the western Pacific Ocean around 108–158N in the model, which in turn leads to better-simulated low-level southerly winds over eastern Asia and more moisture supply to the NEAM region. The GCM’s ability in capturing the year-to-year variation of NEAM rainfall is also markedly improved in the experiment. These results show that the diabatic heating error over the western Pacific can be one reason for poor NEAM simulations in GCMs. The authors also suggest a simple method to reduce model heating biases that can be readily applied to dynamical seasonal prediction systems.
1. Introduction
The Asian summer monsoon is one of the most energetic components of the earth’s climate system. Many operational centers are using dynamical models for seas o n al c l i m at e p r e d i c t i o ns . H o w e v e r , s i m u l a t i n g t h e monsoons is still among the most challenging tasks in climate modeling. For the summertime northeast Asian monsoon (NEAM), Kang et al. (2002) showed that many general circulation models (GCM) have difficulties in reproducing the NEAM subtropical rainband (the mei-yu–changma–baiu front). Model NEAM rainfall is likely to be sensitive to the physical parameterizations being used. On the other hand, some m


Full Text
Title Improving the Northeast Asian monsoon simulation
Similar Titles
Sub Title

Remote impact of tropical hating bias correction

Material Type Articles
Author(English)

An, Kyong-Hee; Tam, Chi-Yung; Park, Chung-Kyu

Publisher

Boston:American Meteorological Society

Date 2009-02
Pages 7
Subject Country Eastern Asia(Asia and Pacific)
South Korea(Asia and Pacific)
Language English
File Type Documents
Original Format pdf
Subject Territorial Development < Environment
Holding APEC Climate Center

Abstract

This study investigates the role of model tropical diabatic heating error on the boreal summer northeast
Asian monsoon (NEAM) simulation given by a general circulation model (GCM). A numerical experiment
is carried out in which the GCM diabatic heating is adjusted toward more realistic values in the tropics. It is found that the seasonal mean NEAM circulation and rainfall are improved in the GCM. This can be
attributed to the reduced positive heating bias in the western Pacific Ocean around 108–158N in the model, which in turn leads to better-simulated low-level southerly winds over eastern Asia and more moisture supply to the NEAM region. The GCM’s ability in capturing the year-to-year variation of NEAM rainfall is also markedly improved in the experiment. These results show that the diabatic heating error over the western Pacific can be one reason for poor NEAM simulations in GCMs. The authors also suggest a simple method to reduce model heating biases that can be readily applied to dynamical seasonal prediction systems.