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Spatiotemporal distribution of precipitation related to weakening of tropical cyclones in Korea
Tellus A: Dynamic Meteorology and Oceanography ( IF 2.247 ) Pub Date : 2021-07-20 , DOI: 10.1080/16000870.2021.1902691
Jae-Won Choi 1
Affiliation  

Abstract

In this study, we analysed the spatiotemporal characteristics of precipitation in Korea in connection with weakening of tropical cyclones (TCs) around the Korean Peninsula (32°–36° N, 122°–132° E) over the past 30 years (1979–2015). Weakened TCs were classified into two categories: TCs weakened to extratropical cyclones (WEC) and TCs weakened to tropical depressions (WTD). In WEC, precipitation was evenly distributed over all of the Korean Peninsula, with the greatest precipitation recorded on the southern coast. In WTD, the amount of precipitation was the greatest on the southern coast, while low precipitation was recorded in the central and inland areas of Korea. In Region 1 (Central Province, Jeollabuk-do, and the inland region of Gyeongsangbuk-do), greater precipitation was observed in WEC than in WTD. In Region 2 (Jeollanam-do, Gyeongsangnam-do, Southeast Gyeongsangbuk-do, and Jeju-do), little difference in precipitation was found between WEC and WTD. In WEC, potential vorticity developed in the upper-level troposphere with TCs approaching Korea along with a thermal trough in the lower-level troposphere to the northwest of the TCs. Meanwhile, an upper-level troposphere jet and a strong upper-level troposphere divergence region were observed to the northeast of the TCs. It was assumed that these meteorological factors had induced baroclinic disturbance and nondiabatic process, creating a wide precipitation area around the TCs. In contrast, in WTD, none of the intense potential vorticity, thermal trough, and upper-level troposphere jet was observed around the TCs. Consequently, only a narrow precipitation area was created around the TCs. The upper-level troposphere divergence region was relatively small, and no intense precipitation area was formed around the TCs.



中文翻译:

韩国热带气旋减弱相关降水时空分布

摘要

在这项研究中,我们分析了过去 30 年(1979 年至 132°E)与朝鲜半岛(北纬 32°–36°,东经 122°–132°)周围热带气旋减弱相关的韩国降水时空特征。 2015)。减弱的TC分为两类:减弱为温带气旋(WEC)的TC和减弱为热带低气压(WTD)的TC。在 WEC,降水均匀分布在整个朝鲜半岛,其中南部海岸的降水量最大。在WTD中,南部沿海降水量最大,而韩国中部和内陆地区降水量较少。在区域 1(中部省份、全罗北道和庆尚北道内陆地区),WEC 的降水量大于 WTD。在第 2 区(全罗南道,庆尚南道、庆尚北道东南部和济州道),WEC 和 WTD 的降水量差异不大。在 WEC 中,随着 TC 逼近韩国,对流层上层出现潜在涡度,同时在 TC 西北部的对流层下层出现热槽。同时,在台风的东北部观测到一个高层对流层急流和一个强烈的高层对流层辐散区。推测这些气象因素引起了斜压扰动和非绝热过程,在TC周围形成了广阔的降水区。相比之下,在 WTD 中,在 TC 周围没有观察到强烈的位涡、热槽和高层对流层急流。因此,仅在 TC 周围形成了狭窄的降水区。

更新日期:2021-07-20
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