亚澳季风区的水汽输送特征  

The Characteristics of Moisture Transport over Asian-Australian Monsoon Region

作　　者：乔云亭[1] 林美静[1] 

机构地区：[1]中山大学大气科学系∥季风与环境研究中心

出　　处：《中山大学学报（自然科学版）》2006年第6期102-105,共4页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：中山大学青年教师科研启动基金资助项目;中国科学院大气物理研究所LASG开放基金资助项目

摘　　要：用1950-2004年NCAR/NCEP再分析资料计算得到逐日垂直积分水汽输送通量矢量Q,然后进行月平均处理,分析了亚澳季风区的水汽输送特征。结果表明,北半球冬季,亚洲季风区低纬地区为东北风水汽输送,它经过赤道偏转为西北风水汽输送,将水汽输送到澳大利亚季风区和低纬南印度洋。北半球夏季,澳大利亚季风区和低纬南印度洋为东南风水汽输送,它经过赤道偏转为西南风水汽输送,将水汽输送到亚洲季风区。夏季的水汽输送要比冬季强盛得多。无论是冬季还是夏季,赤道上存在两个显著的水汽经向输送大值区,分别在35°-65°E和100°-135°E。冬季100°-135°E的平均值稍强;夏季35°-65°E的平均值远大于100°-135°E的水汽输送值,这说明夏季索马里越赤道气流在亚、澳季风区之间的水汽交换中占主要地位。两支越赤道水汽输送是相互独立的。每支越赤道水汽输送本身在冬、夏季存在显著负相关,当冬季从亚洲季风区向澳大利亚季风区和低纬南印度洋的水汽输送偏强时,接下来的夏季,从澳大利亚季风区和低纬南印度洋向亚洲季风区的水汽输送也偏强;反之亦然。The daily moisture transport flux （Q） calculated by using NCAR/NCEP reanalyzed data fronl 1950 to 2004 and the monthly mean moisture transport flux are used to analyze the characteristics of moisture transport over Asian-Australian monsoon region. The results show that there is northeasterly moisture transport in low latitude area over Asian monsoon region in boreal winter, and it turns northwestward cross equator and transports moisture to Australian monsoon region and low-latitude Southern Indian Ocean. While in boreal summer, there is southeasterly moisture transport over Australian monsoon region and low-latitude Southern Indian Ocean, it turns southwestward cross equator and transports moisture to Asian monsoon region. Comparing with the moisture transport in winter, the moisture transport in summer is much stronger. Whether in winter or summer, there are two obvious meridional moisture transports on the equator, one is the moisture transport over 35° -65°E , and the other is the moisture transport over 100E and 135°E. The latter one is a little stronger in winter, while the former one is much stronger in summer, which means the Somali cross-equatorial Jet plays a dominant role in moisture exchange between Asian and Australian monsoon region in summer. The two cross-equatorial moisture transports are independent of each other. There are outstanding correlations between the cross-equatorial moisture transport in winter and in smnmer both over 35°- 65°E and 100° -135°E. When the moisture transport from Asian monsoon region to Australian monsoon region and low-latitude Southern Indian Ocean is stronger in winter, then in the following summer, the moisture transport from Australian monsoon region and low-latitude Southern Indian Ocean to Asian monsoon region will be also stronger, and vice versa.

关 键 词：亚澳季风区 水汽输送 越赤道 

分 类 号：P434[天文地球—大气科学及气象学]