南海夏季风持续异常的特征及其对全球环流的影响II.数值试验  

Characteristics of Persistent Anomaly of the South China Sea Summer Monsoon and Its Influence on the Global Atmospheric Circulation Part II.Numerical Experiment

作　　者：马淑杰[1] 孙淑清[1] 

机构地区：[1]中国科学院大气物理研究所,北京100029

出　　处：《气候与环境研究》2003年第3期356-369,共14页Climatic and Environmental Research

基　　金：中国科学院知识创新重点项目ZXCX2 SW 2 10和ZXCX3 SW 2 13;国家自然科学重点基金资助项目4 0 1350 2 0共同资助

摘　　要：利用T42L9全球大气环流谱模式进行数值试验 ,以揭示南海夏季风强度异常的特征及其影响。控制试验结果表明 ,该模式不仅能够很好地模拟出气候平均的西风带槽脊和高低空气流分布以及它们的季节性变化 ,而且对于与亚洲季风有关的各个主要系统 ,如南亚高压、副高进退及越赤道气流等都有较强的模拟能力。在亚洲季风区及热带太平洋这一大范围区域的大气内部热源异常强迫下 ,模式显示出了南海夏季风持续异常的特征、北半球热带外环流的响应以及亚洲季风区降水异常分布。南海夏季风长时间强度异常所引起的大气内部热源异常 ,一方面通过三维垂直环流的异常联结着南海夏季风对北半球热带内外环流的影响 ,另一方面它又通过持续异常期的波列传播 ,即能量的传播 ,不仅影响我国长江流域降水 ,还会逐渐影响到北半球中高纬环流结构。这样西风带环流形势将会发生相应的变化和调整 ,南海夏季风持续异常影响到了北半球大气环流和天气气候的变化。By using T42L9 atmospheric circulation model, a series of numerical experiments are done to see the characteristics of persistent anomaly of the South China Sea Summer Monsoon (SCSM) and its influence on the global atmospheric circulation. Not only the mean westerly trough and ridge, the distribution of the flow both on the high and low levels and their seasonal change,but also the main systems associated with the Asian summer monsoon are all simulated well by the model. Under the heating on the area of the Asian summer monsoon and the tropical Pacific, the model successfully shows the characteristics of the persistent anomaly of the SCSM, the response of the extra-tropical circulation and the anomaly rainfall distribution on the area of the Asian summer monsoon.The atmospheric thermal forcing representing the strength of SCSM influences not only on the precipitation on the Yangtze River, but also on the circulation structure of mid- and high-latitudes of the Northern Hemisphere through the three-dimensional vertical circulation anomaly and the wave-train propagating, which reflects the transferring path of the energy.

关 键 词：南海夏季风 大气环流 数值试验 亚洲季风 

分 类 号：P732.1[天文地球—海洋科学] P435.2