CAJ | 학술논문

利用1951-2007年NCEP/NCAR再分析资料及中国国家气候中心160站降水和环流特征指数,研究了近57 a来夏季平均的西太平洋副热带高压面积指数的气候变化特征及其对同期中国降水的影响.结果表明,在全球变暖的气候背景下,夏季副热带高压面积也表现出增大趋势,其中20世纪60年代中期和20世纪末显著增强,并呈现出准20 a的年代际周期变化特征.各周期中,中国同期降水及流场均出现较大调整:随着西太平洋副热带高压面积长期趋于增大,东亚夏季风异常偏弱,降水分布由"北多南少"转为"北少南多",而降水线性增长的区域则呈现出较上一周期明显北移的特征.
이용1951-2007년NCEP/NCAR재분석자료급중국국가기후중심160참강수화배류특정지수,연구료근57 a래하계평균적서태평양부열대고압면적지수적기후변화특정급기대동기중국강수적영향.결과표명,재전구변난적기후배경하,하계부열대고압면적야표현출증대추세,기중20세기60년대중기화20세기말현저증강,병정현출준20 a적년대제주기변화특정.각주기중,중국동기강수급류장균출현교대조정:수착서태평양부열대고압면적장기추우증대,동아하계풍이상편약,강수분포유"북다남소"전위"북소남다",이강수선성증장적구역칙정현출교상일주기명현북이적특정.
Using the NCEP/NCAR reanalysis from 1951 through 2007,the precipitation data at 160 sta-tions and the circulation index in the same period released by the National Climate Center of China,wehave investigated in the present paper the abrupt changes in area of summertime mean West Pacific Subtropical High(WPSH)and interdacadal variations in summer precipitation over China during the last 57 years.The results suggest that under the background of the global warming,the area of WPSH also showed an apparent increasing trend especially in the mid-1960s and the late 1990s(i.e.an inter-decadal change character of quasi-20 years).In the three quasi-20 year periods of the 1950s-1960s,the 1920s-1980s and the 1990s-2007,summer precipitation and atmospheric circulation over China were obviously changed:along with successive increase in the area of WPSH,the East Asian monsoon became anomalously weak;and the precipitation pattern over China changed from positive anomaties in Southern China-negative anomaties in Southern China in the 1950s-1960s to negative anomaties in Northern China-positive anomaties in Southern China in the 1990s-2007;and the area where the pre-cipitation linearly increased also showed a northward migration trend.