摘要
由NCEP再分析资料、向外长波辐射(OLR)和GPCP卫星导出(IR)GPI的日降水分析得到:2008年南海夏季风于5月2候在南海爆发,时间较常年(5月4候)偏早,10月第2候结束,时间较常年(9月6候)偏晚。南海夏季风爆发后,由于受强冷空气影响,南海夏季风北推影响到华南地区的时间较常年偏晚。尽管2008年南海夏季风强度较常年偏弱,其仍存在明显的季节内振荡过程,主要周期为30～60天。由于南海地区和我国华南地区的水汽辐合增强以及南海夏季风活动北界在35°N附近维持时间较长(大约7候),华南、长江中下游和淮河流域的夏季降水异常增多。
Based on daily NCEP reanalysis data, OLR and satellite rainfall data, the characteristics of the activities of South China Sea summer monsoon （SCSSM） in 2008 were analyzed. The results show that the SCSSM broke up in the second pentad of May, which was earlier than normal. SCSSM withdrew in the second pentad of October, which was later than normal Due to strong cold air activities, the time in which the SCSSM pushed northward to affect Southern China was later than normal. Although the SCSSM intensity was weaker than normal, there still existed obvious intraseasonal oscillations. Its dominant period was between 30-60 days. The rainfall was much more than normal over Southern China, the mid-lower Changjiang River Basin and the Huaihe River Basin, which was induced by stronger-than-normal moisture convergence in the South China Sea and Southern China, as well as longer-than-normal duration of SCSSM northernmost extent near 35°N.
出处
《热带气象学报》
CSCD
北大核心
2009年第3期265-272,共8页
Journal of Tropical Meteorology
基金
2007年公益性科研院所基本科研业务费(南海夏季风监测业务维护和预测技术开发)
广东省科技计划项目(2005B32601007)"
国家自然科学基金项目(40675055)
广东省自然科学基金项目(06020745)共同资助
关键词
天气学
南海夏季风
建立
北推
季内振荡
水汽输送
South China Sea summer monsoon
onset
intraseasonal oscillation
moisture transport
