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http://dx.doi.org/10.14191/Atmos.2021.31.1.017

Effect of Model Domain on Summer Precipitation Predictions over the Korean Peninsula in WRF Model  

Kim, Hyeong-Gyu (Department of Atmospheric Science, Kongju National University)
Lee, Hye-Young (Department of Atmospheric Science, Kongju National University)
Kim, Joowan (Department of Atmospheric Science, Kongju National University)
Lee, Seungwoo (Numerical Data Application Division, Numerical Modeling Center, Korea Meteorological Administration)
Boo, Kyung On (Operational Systems Development Department, National Institute of Meteorological Sciences)
Lee, Song-Ee (Department of Atmospheric Science, Kongju National University)
Publication Information
Atmosphere / v.31, no.1, 2021 , pp. 17-28 More about this Journal
Abstract
We investigated the impact of domain size on the simulated summer precipitation over the Korean Peninsula using the Weather Research and Forecasting (WRF) model. Two different domains are integrated up to 72-hours from 29 June 2017 to 28 July 2017 when the Changma front is active. The domain sizes are adopted from previous RDAPS (Regional Data Assimilation and Prediction System) and current LDAPS (Local Data Assimilation and Prediction System) operated by the Korea Meteorological Administration, while other model configurations are fixed identically. We found that the larger domain size showed better prediction skills, especially in precipitation forecast performance. This performance improvement is particularly noticeable over the central region of the Korean Peninsula. Comparisons of physical aspects of each variable revealed that the inflow of moisture flux from the East China Sea was well reproduced in the experiment with a large model domain due to a more realistic North Pacific high compared to the small domain experiment. These results suggest that the North Pacific anticyclone could be an important factor for the precipitation forecast during the summer-time over the Korean Peninsula.
Keywords
Domain size; precipitation; sensitivity test; WRF model; Korean Peninsula;
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