Potential Precursory Signals of Localized Torrential Rainfall From Geostationary Satellite and Radar Observations: A Case Study of the 2022 Seoul Flood

IF 2.2 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Gyuyeon Kim, Yong-Sang Choi, Junho Ho
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Abstract

The Korean Peninsula frequently experiences localized torrential rainfall (LTR) in the summer. However, on August 8, 2022, a peculiar LTR occurred by the continuous generation of convective clouds within a few hours, numerical weather prediction model was hard to forecast such a high intensity of LTR. This study explores the possibility of uncovering potential precursory signals using remote sensing techniques in both Geostationary Korea Multi-Purpose Satellite 2A (GK2A) and the operational RKSG (Camp Humphreys) Weather Surveillance Radar 88 Doppler (WSR-88D). Using cloud properties from GK2A, cloud top temperature showed a decrease and maintained low values below 220 K 1–1.5 h before the LTR events. However, discerning the exact onset of LTR in already mature stage clouds using only GK2A variables proved challenging. Instead, liquid water content from RKSG sharply increased before the LTR started. Our calculation of the LTR potential from a combination of GK2A and RKSG cloud properties shows a more accurate precursory signal of LTR than from GK2A cloud properties solely or RKSG either. This study highlights the synergistic benefits of combining geostationary satellite and radar observations to understand and predict early precursors of LTR events.

Abstract Image

从地球静止卫星和雷达观测中获取局部暴雨的潜在前兆信号:2022 年首尔洪水案例研究
朝鲜半岛在夏季经常出现局部暴雨(LTR)。然而,在 2022 年 8 月 8 日,由于在几个小时内连续产生对流云,发生了一次奇特的局地暴雨,数值天气预报模式很难预报如此高强度的局地暴雨。本研究探讨了利用遥感技术揭示韩国静止多用途卫星 2A(GK2A)和 RKSG(汉弗莱斯营)88 多普勒气象监视雷达(WSR-88D)潜在前兆信号的可能性。利用 GK2A 的云属性,云顶温度在 LTR 事件发生前 1-1.5 小时出现下降,并维持在 220 K 以下的低值。然而,仅使用 GK2A 变量来辨别已经成熟阶段的云层中 LTR 的确切开始时间证明具有挑战性。相反,RKSG 的液态水含量在 LTR 开始前急剧增加。我们根据 GK2A 和 RKSG 云特性组合计算出的 LTR 潜势显示,LTR 的前兆信号比仅根据 GK2A 云特性或 RKSG 更准确。这项研究强调了结合静止卫星和雷达观测来了解和预测 LTR 事件早期前兆的协同效益。
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来源期刊
Asia-Pacific Journal of Atmospheric Sciences
Asia-Pacific Journal of Atmospheric Sciences 地学-气象与大气科学
CiteScore
5.50
自引率
4.30%
发文量
34
审稿时长
>12 weeks
期刊介绍: The Asia-Pacific Journal of Atmospheric Sciences (APJAS) is an international journal of the Korean Meteorological Society (KMS), published fully in English. It has started from 2008 by succeeding the KMS'' former journal, the Journal of the Korean Meteorological Society (JKMS), which published a total of 47 volumes as of 2011, in its time-honored tradition since 1965. Since 2008, the APJAS is included in the journal list of Thomson Reuters’ SCIE (Science Citation Index Expanded) and also in SCOPUS, the Elsevier Bibliographic Database, indicating the increased awareness and quality of the journal.
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