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http://dx.doi.org/10.5467/JKESS.2019.40.6.584

A Study of the Influence of Short-Term Air-Sea Interaction on Precipitation over the Korean Peninsula Using Atmosphere-Ocean Coupled Model  

Han, Yong-Jae (Department of Earth System Prediction, Korea Environmental Science & Technology Institute)
Lee, Ho-Jae (Department of Earth System Prediction, Korea Environmental Science & Technology Institute)
Kim, Jin-Woo (Department of Earth System Prediction, Korea Environmental Science & Technology Institute)
Koo, Ja-Yong (Department of Earth System Prediction, Korea Environmental Science & Technology Institute)
Lee, Youn-Gyoun (Department of Earth System Prediction, Korea Environmental Science & Technology Institute)
Publication Information
Journal of the Korean earth science society / v.40, no.6, 2019 , pp. 584-598 More about this Journal
Abstract
In this study, the effects of air-sea interactions on precipitation over the Seoul-Gyeonggi region of the Korean Peninsula from 28 to 30 August 2018, were analyzed using a Regional atmosphere-ocean Coupled Model (RCM). In the RCM, a WRF (Weather Research Forecasts) was used as the atmosphere model whereas ROMS (Regional Oceanic Modeling System) was used as the ocean model. In a Regional Single atmosphere Model (RSM), only the WRF model was used. In addition, the sea surface temperature data of ECMWF Reanalysis Interim was used as low boundary data. Compared with the observational data, the RCM considering the effect of air-sea interaction represented that the spatial correlations were 0.6 and 0.84, respectively, for the precipitation and the Yellow Sea surface temperature in the Seoul-Gyeonggi area, which was higher than the RSM. whereas the mean bias error (MBE) was -2.32 and -0.62, respectively, which was lower than the RSM. The air-sea interaction effect, analyzed by equivalent potential temperature, SST, dynamic convergence fields, induced the change of SST in the Yellow Sea. In addition, the changed SST caused the difference in thermal instability and kinematic convergence in the lower atmosphere. The thermal instability and convergence over the Seoul-Gyeonggi region induced upward motion, and consequently, the precipitation in the RCM was similar to the spatial distribution of the observed data compared to the precipitation in the RSM. Although various case studies and climatic analyses are needed to clearly understand the effects of complex air-sea interaction, this study results provide evidence for the importance of the air-sea interaction in predicting precipitation in the Seoul-Gyeonggi region.
Keywords
air-sea interaction; precipitation; atmosphere-ocean coupled model;
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Times Cited By KSCI : 3  (Citation Analysis)
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