THE CHARACTERISTICS OF PRECIPITATION IN GUANGDONG PROVINCE OVER THE PAST 50 YEARS:DEPENDENCE ON RAINFALL INTENSITY

ZHENG Teng-fei; LIU Xian-tong; WAN Qi-lin; YU Xin

doi:10.16032/j.issn.1004-4965.2017.02.007

Abstract：The characteristics of the precipitation over Guangdong Province over the past 50 years were investigated with the daily rainfall data of 86 stations from 1961 to 2010.The rainfall was divided into five categories according to its intensity,and their spatial and temporal characteristics were investigated.The annual rainfall amount is within 1 500～2 000 mm over most parts of Guangdong,but substantial differences were found among different parts of the province.The dry season is contributed mostly by daily rainfall amount rather than rainy days,while the flood season is contributed by not only rainy days but also daily rainfall amount.The spatial distributions of light rainy days (1 mm＜P＜10 mm) and moderate rainy days (10 mm＜P＜25 mm) resemble each other.The heavy rainy days (25 mm＜P＜50 mm),very heavy rainy days (50 mm＜P＜100 mm) and extreme rainy days are generally concentrated in three regions,Qingyuan,Yangjiang,and Haifeng/Lufeng.The averaged rainfall amount for rainy days increases from the north to the south of Guangdong,while decreasing as the rainfall intensity increases.The contributions from light rain,moderate rain and heavy rain to the total rainfall decreases from the north to the south of the province,but the contribution from very heavy rain and extreme rain increases from the north to the south.The annual rainy days show a decreasing trend in the past 50 years.The light rainy days decreased significantly while the heavy,very heavy and extreme rainy days increases slightly.The annual total rainfall amount increases over the past 50 years,which is contributed by heavy,very heave and extreme rains,while the contribution from light and moderate rains decreases.