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Interannual variability of Mascarene high and Australian high and their influences on summer rainfall over East Asia
作者姓名:XUEFeng  WANGHuijun  HEJinhai
作者单位:[1]LASG,InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijing100029,China [2]不详,InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijing100029,China [3]KLME,NanjingInstituteofMeteorology,Nanjing210044,China
基金项目:the National Key Basic Development Program (Grant No. G1998040900,Part I) and the National Natural Science Foundation of China (Grant Nos. 40125014 and 40075020)
摘    要:Based on the reanalysis data from NCEP/NCAR and other observational data,interannual variability of Mascarene high(MH) and Australian high(AH) from 1970 to 1999 is examined.It is shown that interannual variability of MH is dominated by the Antarctic oscillation(AAO),when the circumpolar low in the high southern latitudes deepens,the intensity of MH will be intensified.On the other hand,AH is correlated by AAO as well as EI Nino and South Oscillation(ENSO),the intensity of AH will be intensified when EI Nino occurs.Both correlation analysis and case study demonstrate that summer rainfall over East Asia is closely related to MH and AH.When MH intensifies from boreal spring to summer (i.e.from austral autumn to winter),there is more rainfall over regions from the Yangtze River valley to Japan,in contrast,less rainfall is found over southern China and western Pacific to the east of Taiwan,and most of regions in mid-latitudes of East Asia.Compared with MH,the effect of AH on summer rainfall in East Asia is limited to localized regions,there is more rainfall over southern China with the intensification of AH.The results in this study show that AAO is a strong signal on interannual timescale,which plays an important role in summer rainfall over East Asia.This discovery is of real importance to revealingt the physical mechanism of interannual variability of East Asian summer monsoon and prediction of summer precipitation in China.

关 键 词:亚州东部  夏季  降雨量  年际变化率  马斯克林高压  澳大利亚高压
收稿时间:2002-11-03

Interannual variability of Mascarene high and Australian high and their influences on summer rainfall over East Asia
XUEFeng WANGHuijun HEJinhai.Interannual variability of Mascarene high and Australian high and their influences on summer rainfall over East Asia[J].Chinese Science Bulletin,2003,48(5):492-497.
Authors:Feng Xue  Huijun Wang  Jinhai He
Institution:XUE Feng1, WANG Huijun & HE Jinhai2 1. LASG, Institute of Atmospheric Physics, Chinese Academy of Sci-ences, Beijing 100029, China; 2. KLME, Nanjing Institute of Meteorology, Nanjing 210044, China
Abstract:Based on the reanalysis data fromNCEP/NCAR and other observational data, interannualvariability of Mascarene high (MH) and Australian high (AH) from 1970 to 1999 is examined. It is shown that interannual variability of MH is dominated by the Antarctic oscillation (AAO), when the circumpolar low in the high southern lati-tudes deepens, the intensity of MH will be intensified. On the other hand, AH is correlated by AAO as well as El Nio and South Oscillation (ENSO), the intensity of AH will be inten-sified when El Nio occurs. Both correlation analysis andcase study demonstrate that summer rainfall over East Asia is closely related to MH and AH. When MH intensifies from boreal spring to summer (i.e. from austral autumn to winter)there is more rainfall over regions from the Yangtze Rivervalley to Japan, in contrast, less rainfall is found over south-ern China and western Pacific to the east of Taiwan, andmost of regions in mid-latitudes of East Asia. Compared with MH, the effect of AH on summer rainfall in East Asia is lim-ited to localized regions, there is more rainfall over southern China with the intensification of AH. The results in this study show that AAO is a strong signal on interannual time-scale, which plays an important role in summer rainfall over East Asia. This discovery is of real importance to revealing the physical mechanism of interannual variability of EastAsian summer monsoon and prediction of summer precipi-tation in China.
Keywords:Mascarene high  Australian high  interannual variability  summer rainfall in East Asia    
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