CAJ | 학술논문

利用1979-2005年华南47个基准站降水资料及由NCAR/NCEP II再分析资料计算所得的水汽输送通量资料,对华南春季降水特征及其与水汽输送的关系进行研究,结果表明:华南春季降水可以110.5°E为界划分为两个区域,以东区域为华南Ⅰ区,以西区域为华南Ⅱ区.Ⅰ区降水具有显著的下降趋势,即干旱趋势显著;而Ⅱ区降水下降趋势要弱得多,未超过信度检验.此外,Ⅰ区降水在1994年发生突变,由多雨期突然跃变到干旱期.华南春季水汽主要来源于南海和西太平洋,并经中南半岛转向输送到华南,当南海中北部的偏南水汽输送偏弱(强)时,Ⅰ区降水偏少(多),Ⅰ区偏旱(涝),当南海西南部-中南半岛南部的偏南水汽输送偏弱(强)时,Ⅱ区降水偏少(多),Ⅱ区偏旱(涝).
이용1979-2005년화남47개기준참강수자료급유NCAR/NCEP II재분석자료계산소득적수기수송통량자료,대화남춘계강수특정급기여수기수송적관계진행연구,결과표명:화남춘계강수가이110.5°E위계화분위량개구역,이동구역위화남Ⅰ구,이서구역위화남Ⅱ구.Ⅰ구강수구유현저적하강추세,즉간한추세현저;이Ⅱ구강수하강추세요약득다,미초과신도검험.차외,Ⅰ구강수재1994년발생돌변,유다우기돌연약변도간한기.화남춘계수기주요래원우남해화서태평양,병경중남반도전향수송도화남,당남해중북부적편남수기수송편약(강)시,Ⅰ구강수편소(다),Ⅰ구편한(로),당남해서남부-중남반도남부적편남수기수송편약(강)시,Ⅱ구강수편소(다),Ⅱ구편한(로).
By using the precipitation data of 47 basic stations in South China and the water vapor transport flux calculated from the NCAR/NCEP II reanalyzed data from 1979 to 2005,the characteristics of droughts in South China in spring and its relationship with water vapor transport flux are studied.The results show that precipitation in South China in spring can be partitioned into two classes.Region Ⅰ,located in the east of 110.5 °E,is characterized by the first class,showing an outstanding decreasing trend in rainfall.Region Ⅱ,located in the west of 110.5 °E ,is marked by the second class with unconspicuous decreasing tendency in reainfall.In 1994,there was an abrupt decrease in rainfall in region Ⅰ.The moisture source of South China is located in the South China Sea and western Pacific Ocean.The water vapor is transported to South China via the southern Indochina peninsula.When the southern water vapor transport is weaker/stronger over the central and northern South China Sea,the precipitation in region Ⅰ correspondingly becomes weaker or stronger and droughts or floods develop.While the southern moisture transport is weaker or stronger over the southwestern South China Sea and southern Indochina peninsula,droughts or floods prevail in region Ⅱ.