上新世以来构造隆升对亚洲夏季风气候变化的影响

The effects of tectonic uplift on the evolution of Asian summer monsoon climate since Pliocene

大量地质证据表明,上新世以来(最近5MaB.P.)青藏高原北部及非洲东部和南部地区出现过显著的构造隆升,而与此同时亚洲季风也经历了显著变化,这两者之间是否存在着因果联系一直是地学界所关心和争论的一个重要科学问题.本文利用美国国家大气研究中心(NCAR)的公用大气模式(CAM 3.1)就上新世以来青藏高原北部及东-南非高原的构造隆升对亚洲夏季风气候变化的影响进行了数值试验研究.结果表明,上新世以来亚洲夏季风的增强与两地构造隆升密切相关,但两者隆升对于亚洲季风子系统的作用是有区别的.青藏高原北部隆升主要造成东亚北部夏季风的增强及季风降水的增多,但对南亚夏季风的作用较小;东-南非高原的隆升明显增强南亚夏季风,但对东亚北部夏季风的影响有限.

Abundant geological climatic southern-eastern Africa have uplifted sig summer monsoon climate has undergone records indicate that northern Tibetan Plateau and nificantly since great changes. Pliocene, at the The connection same time, the Asian between them is a hot scientific topic in the earth science field. In this paper we conduct a modeling study to explore the climatic effects of tectonic uplifts in northern Tibetan Plateau and southern-eastern Africa since Pliocene by using the Community Atmosphere Model （CAM3.1） of National Center for Atmospheric Research （NCAR）. The results show that the intensification of Asian summer monsoon since Pliocene has close but differential relationships with the tectonic uplifts in the two regions during this period. The uplift of northern Tibetan Plateau mainly intensifies the summer monsoon and increases the precipitation over northern East Asia, and has less effect on South Asian summer monsoon. Whereas, the uplift of southern-eastern Africa principally strengthens South Asian summer monsoon but has less influence on northern East Asian summer monsoon.