次季节波动对青藏高原及其下游东亚季风区降水的影响

The Review of the Influence of Sub-Seasonal Oscillation on Precipitation over the Qinghai-Xizang(Tibetan)Plateau and its Downstream East Asian Monsoon Region

影响青藏高原及其下游季风区的次季节波动对我国乃至亚洲地区的洪涝灾害起着不容忽视的作用。本文回顾了近40年来在青藏高原及下游东亚季风区的次季节降水方面取得的进展,主要从影响降水的次季节尺度波动的特征、来源和传播机制对研究成果进行了归纳。回顾表明,青藏高原及下游东亚季风区的降水主要受到来自欧亚大陆及孟加拉湾-南海地区30~60天及准双周次季节波动的强烈影响,同时高原次季节波动能够直接与间接地影响下游季风区降水。本文有助于系统理解高原及下游东亚季风区次季节大气振荡及降水,并基于现有研究提出了该领域值得进一步研究的重点和方向,具有一定的科学意义和参考价值。

The sub-seasonal oscillation affecting the Qinghai-Xizang(Tibetan)Plateau and its downstream plays an important role in the drought and flood disasters in China and Asia. This paper reviews the progress of sub-seasonal precipitation over the Qinghai-Xizang(Tibetan)Plateau and its downstream East Asian monsoon region in the past 40 years,mainly focusing on the characteristics,origin,propagation and underlying mechanism of the related oscillations. The review shows that the 30~60 day and quasi-biweekly oscillations from the Eurasian continent and the Bay of Bengal-South China Sea region can influence the precipitation over the Qinghai-Xizang(Tibetan)Plateau and the downstream East Asian monsoon region significantly. Also,the sub-seasonal oscillation over the Qinghai-Xizang(Tibetan)Plateau has both direct and indirect impacts on the precipitation on the middle and lower reaches of the Yangtze River. This paper can not only excite the understanding of the sub-seasonal atmospheric oscillation and precipitation over the plateau and its downstream East Asian monsoon region,but also propose the future prospects in this field,which can throw some light on the investigation of sub-seasonal oscillations over East Asia.