Impact of atmospheric changes on the low-frequency variations of convective afternoon rainfall activity over Taiwan

Wan Ru Huang*, Huang Hsiung Hsu, Shih Yu Wang, Jian Pu Chen

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

11 引文 斯高帕斯(Scopus)

摘要

This study examines the characteristics of low-frequency variations (defined as decadal-scale changes) in summer (June-August) convective afternoon rainfall (CAR) activity over Taiwan during 1961-2012. Using 3-hourly rain gauge data, it was found that (1) the CAR frequency exhibits a secular trend and the 10-20 decadal oscillation, (2) the trend in CAR frequency is positive in northern Taiwan but negative in central and southern Taiwan, and (3) the CAR rate increased over most of the lower plains but decreased over themountain range of Taiwan. Diagnoses using the Japanese ReAnalysis (JRA-55) data and surface observations indicate that the low-frequency variations in CAR frequency are closely associated with the variations in monsoon southwesterly winds over the South China Sea and island-wide sea breeze convergence. The regional low-level circulation changes are linked to sea surface temperature anomalies over the Niño-4 region and its 10-20 year (quasi-decadal) oscillation. Regarding the processes that change the CAR rate in the trending patterns, it was found that increases in the moisture flux convergence and the moist (conditional) instability over the lower plains together explain the stronger CAR events in the long run.

原文英語
頁(從 - 到)8743-8758
頁數16
期刊Journal of Geophysical Research
120
發行號17
DOIs
出版狀態已發佈 - 2015

ASJC Scopus subject areas

  • 地球物理
  • 森林科學
  • 海洋學
  • 海洋科學
  • 生態學
  • 水科學與技術
  • 土壤科學
  • 地球化學與岩石學
  • 地表過程
  • 大氣科學
  • 地球與行星科學(雜項)
  • 空間與行星科學
  • 古生物學

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