EFFECTS OF DIFFERENT DENSITY STATION ON CLIMATE STATISTICAL CHARACTERISTICS ANALYSIS OF TROPICAL CYCLONES PRECIPITATION

LU Xiao-qin; YU Hui; YING Ming; QI Liang-bo

doi:10.16032/j.issn.1004-4965.2016.05.003

Abstract：1 41 6 conventional ground-based observations in different spatial density groups were used to analyze the variance of TC precipitation climate characteristics for the entire Chinese mainland,regional areas (Taking East China and South China as cases)and provinces (Taking Guangdong,Hainan and Jiangxi as cases)sepa-rately.The results showed that for the Chinese mainland,the total precipitation,mean annual precipitation, mean daily precipitation and its spatial distribution were the same for different spatial density station groups. There were slight differences with the precipitation extremes and their spatial distribution.So there was no obvi-ous variance on TC precipitation climate characteristics analyzed with different station density groups for the en-tire Chinese mainland.Regional and provincial results showed that there was no significant difference for mean daily precipitation,but there were for the daily precipitation extremes and rainstorm frequency.And the daily precipitation extreme value analyzed with the sparser station group was a little smaller than that analyzed with the denser station group,which would affect the regional climate statistics.For the extent of station density impact on the TC precipitation climatic characteristic analysis,there were more obvious influence on Hainan than that of Guangdong and Jiangxi.And it affected South China (Including Guangdong,Guangxi and Hainan)more than East China (Including Shandong,Jiangsu,Zhejiang,Shanghai,Fujian,Anhui and Jiangxi).Further-more,the analysis proved that the climatic statistical characteristic began to change significantly when the inter-val was between 40 and 50 km,which was or was near the mean interval of the entire Chinese mainland sta-tions.Moreover,TC areal precipitation climatic characteristic,including mean total areal precipitation and mean daily areal precipitation,also began to change significantly when the interval was between 40 and 50 km, and were completely different when it was between 1 00 or 200 km.