JpGU-AGU Joint Meeting 2020

講演情報

[E] 口頭発表

セッション記号 A (大気水圏科学) » A-CG 大気海洋・環境科学複合領域・一般

[A-CG45] 熱帯インド洋・太平洋におけるマルチスケール大気海洋相互作用

コンビーナ:小坂 優(東京大学先端科学技術研究センター)、Sang-Wook Yeh(Hanyang University)、堀井 孝憲(海洋研究開発機構 戦略研究開発領域 地球環境観測研究開発センター)、Hiroki Tokinaga(Disaster Prevention Research Institute, Kyoto University)

[ACG45-07] Marginal sea surface temperature variation as a pre-cursor of heat waves over the Korean Peninsula

★Invited Papers

*Yoo-Geun Ham1 (1.Department of Oceanography, Chonnam National University)

キーワード:North Pacific SST variability, Heatwave over the East Asia, Seasonal prediction

This study examines the role of the marginal sea surface temperature (SST) on heat waves over Korea. It is found that sea surface warming in the south sea of Korea/Japan (122-138°E, 24-33°N) causes heat waves after about a week. Due to the frictional force, the positive geopotential height anomalies associated with the south sea warming induce divergent flows over the boundary layer. This divergent flow induces the southerly in Korea, which leads to a positive temperature advection. On the other hand, over the free-atmosphere, the geostrophic wind around high-pressure anomalies flows in a westerly direction over Korea during the south sea warming, which is not effective in temperature advection. Therefore, the positive temperature advection in Korea due to the south sea warming decreases with height. This reduces the vertical potential temperature gradient, which indicates a negative potential vorticity (PV) tendency over Korea. Therefore, the high-pressure anomaly over the south sea of Korea is propagated northward, which results in heat waves due to more incoming solar radiation.