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Cha, Dong-Hyun
High-impact Weather Prediction Lab (HWPL)
Research Interests
  • Typhoon Modeling, Regional Climate Modeling, High-impact Weather

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Improvement of regional climate simulation of East Asian summer monsoon by coupled air-sea interaction and large-scale nudging

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Title
Improvement of regional climate simulation of East Asian summer monsoon by coupled air-sea interaction and large-scale nudging
Author
Cha, Dong-HyunJin, Chun-SilMoon, Ji-HongLee, Dong-Kyou
Issue Date
2016-01
Publisher
WILEY-BLACKWELL
Citation
INTERNATIONAL JOURNAL OF CLIMATOLOGY, v.36, no.1, pp.334 - 345
Abstract
Impacts of coupled air-sea interaction and large-scale nudging were examined through regional climate simulation of the East Asian summer monsoon (EASM). A slab ocean model (SOM) was coupled with a regional climate model (RCM) to investigate the impact of two-way air-sea interaction, and the spectral nudging was applied to examine the effect of large-scale nudging. The control run without coupled air-sea interaction and large-scale nudging had significantly large systematic errors in simulated oceanic precipitation, monsoon circulations, and subtropical high. The errors resulted from an erroneous physical process caused by uncoupled air-sea interaction. The experiment with a SOM reduced the unreasonable physical process because simulated sea surface temperature (SST) decreases with enhanced ocean surface mixing from intensified low-level wind. Therefore, coupled air-sea interaction in the SOM run improved the simulations of seasonal mean precipitation, monsoon circulations, and subtropical high. In the experiment with a SOM and large-scale nudging, simulated precipitation and synoptic fields were further improved because the spectral nudging decreased the systematic error of large-scale circulations between model solution and large-scale forcing. Simulated results indicated that adjusting simulated SST to atmospheric conditions by coupling an ocean model with a RCM and improving boundary conditions by implementing large-scale nudging are necessary for advanced simulation of the EASM using RCMs.
URI
https://scholarworks.unist.ac.kr/handle/201301/18032
URL
http://onlinelibrary.wiley.com/doi/10.1002/joc.4349/abstract
DOI
10.1002/joc.4349
ISSN
0899-8418
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