Shear lines trigger heavy rainfalls in the Philippines during the winter monsoon

IF 8.5 1区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

npj Climate and Atmospheric Science Pub Date : 2024-10-01 DOI:10.1038/s41612-024-00780-5

Sheilla Mae Reyes, Seungyeon Lee, Seon Ki Park

引用次数: 0

Abstract

Heavy rainfall events (HREs) occur almost throughout the year in the Philippines, with relatively limited research during the winter monsoon. This study analyzes the 20-year (2003–2022) daily precipitation from 55 rain gauges and Integrated Multi-satellitE Retrievals for GPM (IMERG) from November to February. HREs are classified into three clusters by employing a cluster analysis on the most pertinent principal modes extracted from the principal component analysis. Each cluster exhibits a distinct heavy rainfall spatial pattern, mostly showing more than 50 mm/day of rainfall in the eastern part of the country. We noted that heavy rainfall in the Philippines during the winter monsoon occurs during a strong East Asian Winter Monsoon and caused by the interaction of shear line and low-level cyclonic vortex. The different location of rainfall maxima in each HRE cluster is a result of the variation of locations of the shear line and cyclonic vortex.

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切变线引发菲律宾冬季季风期间的强降雨

菲律宾几乎全年都会发生强降雨事件（HREs），冬季季风期间的研究相对有限。本研究分析了 55 个雨量计和 GPM 综合多卫星检索（IMERG）在 11 月至 2 月期间 20 年（2003-2022 年）的日降水量。通过对从主成分分析中提取的最相关主模式进行聚类分析，将暴雨区域划分为三个聚类。每个聚类都呈现出明显的强降雨空间模式，其中东部地区的降雨量大多超过 50 毫米/天。我们注意到，菲律宾冬季季风期间的强降雨发生在强烈的东亚冬季季风期间，是由切变线和低层气旋涡旋相互作用造成的。由于切变线和气旋涡旋的位置不同，每个高纬度地区集群的最大降雨量位置也不同。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

npj Climate and Atmospheric Science Earth and Planetary Sciences-Atmospheric Science

CiteScore

8.80

自引率

3.30%

发文量

审稿时长

21 weeks

期刊介绍： npj Climate and Atmospheric Science is an open-access journal encompassing the relevant physical, chemical, and biological aspects of atmospheric and climate science. The journal places particular emphasis on regional studies that unveil new insights into specific localities, including examinations of local atmospheric composition, such as aerosols. The range of topics covered by the journal includes climate dynamics, climate variability, weather and climate prediction, climate change, ocean dynamics, weather extremes, air pollution, atmospheric chemistry (including aerosols), the hydrological cycle, and atmosphere–ocean and atmosphere–land interactions. The journal welcomes studies employing a diverse array of methods, including numerical and statistical modeling, the development and application of in situ observational techniques, remote sensing, and the development or evaluation of new reanalyses.