CAJ | 학술논문

利用国家气候中心的降水资料及NCEP/NCAR再分析资料、NOAA海温资料分析了华南地区5月降水的主要水汽通道及变异机制。发现异常多雨年的水汽主要来自南海、孟加拉湾和青藏高原南侧；异常少雨年则因西太平洋副热带高压（简称副高）偏东，来自南海的水汽缺失，只有来自孟加拉湾和高原南侧的两股水汽，因而南海的水汽是影响华南地区5月降水的重要因素。分析发现当北太平洋的准东西向海温异常是“负正负”分布时，南海地区为异常的反气旋性环流，有利于副高西伸加强；北太平洋海温距平为“正负正”异常分布时，南海地区为异常的气旋性环流，副高东退减弱。此外，北方南下冷空气的阻挡使得季风北界位置偏南，冷空气和季风在华南地区交汇导致5月降水异常增多。
이용국가기후중심적강수자료급NCEP/NCAR재분석자료、NOAA해온자료분석료화남지구5월강수적주요수기통도급변이궤제。발현이상다우년적수기주요래자남해、맹가랍만화청장고원남측；이상소우년칙인서태평양부열대고압（간칭부고）편동，래자남해적수기결실，지유래자맹가랍만화고원남측적량고수기，인이남해적수기시영향화남지구5월강수적중요인소。분석발현당북태평양적준동서향해온이상시“부정부”분포시，남해지구위이상적반기선성배류，유리우부고서신가강；북태평양해온거평위“정부정”이상분포시，남해지구위이상적기선성배류，부고동퇴감약。차외，북방남하랭공기적조당사득계풍북계위치편남，랭공기화계풍재화남지구교회도치5월강수이상증다。
Precipitation data from the National Climate Center, China Meteorological Administrition, NCEP/NCAR reanalysis data, and Sea Surface Temperature (SST) data from NOAA are used to study the climatological characters of vapor transportation route and the differences in transport mechanism for the month of May in abnormally rainy and rainless years in South China. The results show that, in rainy years, moisture comes from the South China Sea (SCS), the Bay of Bengal, and south of the Tibet Plateau. In rainless years the West Pacific Subtropical High (WPSH) is more eastern, and so vapor from the SCS, which is significant for the precipitation during May, cannot reach South China. When the SST anomalies in North Pacific have a quasi east-west “-+-” pattern, anticyclones can be triggered in the SCS and WPSH can be enhanced and stretched westward. When the SST anomalies in North Pacific are “+-+”, cyclones can be triggered in the SCS, causing eastward weakening of the WPSH. The front of the southwest monsoon will be further south because of the barrier of cold air, and the intersection of the monsoon and cold air in South China will cause more <br> precipitation anomalies.