ZHU Tiecai, LIN Wenshi, YE Kunhui, et al. Precipitation Variations and Drought Causes in the Cold Half of the Year in the Pearl River Delta Region during the past 38 Years[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2011,50(4):144-147.
ZHU Tiecai, LIN Wenshi, YE Kunhui, et al. Precipitation Variations and Drought Causes in the Cold Half of the Year in the Pearl River Delta Region during the past 38 Years[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2011,50(4):144-147.DOI:
Based on the historical records of monthly precipitation from 22 weather stations in the Pearl River Delta region from 1970 to 2008
this paper used running mean
EOF analysis and wavelet analysis to document precipitation variations and drought causes in the cold half of the year. The precipitation variations during the cold half of the year in the Pearl River Delta region show a highly synchronization
with a cycle of 6~7 years. The precipitation in the cold half of the year may reduce in the near future. The main reasons for drought during the cold half of the year in the Pearl River Delta region are weak polar vortex
strong European trough and ridge near the Balkhash Lake
active cold air
inactive westerly wind disturbance in the lowmid latitudes
weak southern branch trough
and less confrontation between cold and warm airs.
关键词
珠三角地区冬半年降水量干旱成因
Keywords
the Pearl River delta regionwinter half year's precipitationdrought causes