201. Influence of cold air damming on snowfall in the mountainous region (Yeongdong) of Korea
- Author
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Kim, Byung-Gon, Choi, Young-Gil, Kim, Ji-Yun, and Lim, Byung-Hwan
- Abstract
In the Yeongdong region (eastern mountainous region of Korea), we examine characteristics of cold air damming and its effect on snowfall by using rawinsonde soundings and model reanalysis data in the Yeongdong region. Two strong CAD events were observed when the snowfall forecast was wrong specifically in its location and timing. For two CAD events, lower-level temperature below ~ 2 km ranged to the coldest limit in comparisons to those of the previous (2014 – 2021) observations, along with the stronger inversion strength (>2.0℃) and thicker inversion depth (>700m). Cold air inflow with a negative buoyance is likely to be blocked by the mountains, which would eventually result in barrier wind, parallel to the mountains. This cold northwesterly wind appears to facilitate cold air damming (CAD), that is confirmed by model reanalysis (LDAPS). Snow clouds formed over the East Sea from moving inland appears to inhibit snowfall or, if any, light amount even if heavy snowfall is to be forecast by Korea Meteorological Administration. Meanwhile, during two weak CAD events, ice pellets (probably freezing rain) of solid precipitation were observed when strong cold advection was prevalent below around 2 km as accompanied with stronger inversion strength (4.7 ~ 9.3 ℃) above the cold clouds. Rawinsonde observation and LDAPS reanalysis identify that extreme cold air intrusions by barrier wind play an important role in modulating snowfall intensity and location, and weak CADs lead to phase change of solid precipitation with a help of cold air blocking of the mountains., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
- Published
- 2023