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KMID : 1024520200290010001
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Journal of the Environmental Sciences
2020 Volume.29 No. 1 p.1 ~ p.13
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Impact of Topographic Forcing and Variation of Lower-level Jet on Local Precipitation in Southeast Region of Korean Peninsula
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Chae Da-Eun
Kim Eun-Ji
Kim Ji-Seon
Lee Soon-Hwan
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Abstract
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Recently, a heavy rainfall with high spatial variation occurred frequently in the Korean Peninsula. The meteorological event that occurred in Busan on 3 May 2016 is characterized by heavy rain in a limited area. In order to clarify the reason of large spatial variation associated with mountain height and location of low level jet, several numerical experiments were carried out using the dynamic meteorological Weather Research and Forecasting (WRF) model. In this case study, the raised topography of Mount Geumjeong increased a barrier effect and air uplifting due to topographic forcing on the windward side. As a result, wind speed reduced and precipitation increased. In contrast, on the downwind side, the wind speed was slightly faster and since the total amount of water vapor is limited, the precipitation on the downwind side reduced. Numerical experiments on shifting the location of the lower jet demonstrated that if the lower jet is close to the mountain, its core becomes higher due to the effect of friction. Additionally, the water vapor convergence around the mountain increased and eventually the precipitation also increased in the area near the mountain. Hence, the location information of the lower jet is an important factor for accurately predicting precipitation.
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KEYWORD
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Heavy rainfall, WRF, Topography effect, Low level jet, Numerical experiments, Busan
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