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Sensitivity Experiments of Vertical Resolution and Planetary Boundary Layer Parameterization Schemes on the Seoul Metropolitan Area using WRF Model
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 Title & Authors
Sensitivity Experiments of Vertical Resolution and Planetary Boundary Layer Parameterization Schemes on the Seoul Metropolitan Area using WRF Model
Lim, A-Young; Roh, Joon-Woo; Jee, Joon-Bum; Choi, Young-Jean;
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The effects of vertical resolutions and planetary boundary layer (PBL) physics schemes in a numerical simulation with a very high resolution over the metropolitan area were investigated. The numerical experiments using the Weather Research and Forecast model were conducted from 0000 UTC 25 October to 0000 UTC 26 October 2013. We verified the numerical results against with six hourly observation data from the radiosonde at Seolleung, which was located in southern part of Seoul, and forty three auto weather systems in Seoul. In the experiments of vertical resolutions in low level atmosphere with 44, 50, and 60 layers, which are set to be subdivided particularly under 2 km height. The experiment in 60 layers, which has the highest vertical resolution in this study, showed relatively a clear diurnal variation of PBL heights. Especially, the difference of PBL heights and 10-meter wind fields were mainly seen in the area of high altitude lands for the experiments of vertical resolution. In the sensitivity experiment of PBL schemes such as asymmetric convective model-version 2 (ACM2), Yonsei University (YSU), and Mellow-Yamada-Janjic (MYJ) to the temperature, all three PBL schemes revealed lower temperature than observed profile from the radiosonde in the entire period. The experiments with YSU PBL and ACM2 PBL schemes show relatively less biased in comparison with the experiment of the MYJ PBL scheme.
planetary boundary layer;radiosonde;vertical resolution;parameterization;
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