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- Title
Improvement of regional climate simulation of East Asian summer monsoon by coupled air--sea interaction and large-scale nudging.
- Authors
Cha, Dong ‐ Hyun; Jin, Chun ‐ Sil; Moon, Ji ‐ Hong; Lee, Dong ‐ Kyou
- 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.
- Subjects
MONSOONS; METEOROLOGICAL precipitation; HYDROLOGIC cycle; CLIMATE change; RAINFALL anomalies
- Publication
International Journal of Climatology, 2016, Vol 36, Issue 1, p334
- ISSN
0899-8418
- Publication type
Article
- DOI
10.1002/joc.4349