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

Autor: Sheilla Mae Reyes, Seungyeon Lee, Seon Ki Park
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: npj Climate and Atmospheric Science, Vol 7, Iss 1, Pp 1-15 (2024)
Druh dokumentu: article
ISSN: 2397-3722
DOI: 10.1038/s41612-024-00780-5
Popis: 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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