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gy_xmc2015

铜虫 (小有名气)

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虫号: 4236684
注册: 2015-11-21
专业: 膜生物化学与膜生物物理学

[交流] 刘晓东关于青藏高原的研究综述

Where were the monsoon regions and arid zones in Asia prior to the Tibetan Plateau uplift?

Xiaodong Liu, Qingchun Guo, Zhengtang Guo, Zhi-Yong Yin, Buwen Dong and Robin Smith6

http://nsr.oxfordjournals.org/content/2/4/403.full

ABSTRACT
The impact of the Tibetan Plateau uplift on the Asian monsoons and inland arid climates is an important
but also controversial question in studies of paleoenvironmental change during the Cenozoic. In order to
achieve a good understanding of the background for the formation of the Asian monsoons and arid
environments, it is necessary to know the characteristics of the distribution of monsoon regions and arid
zones in Asia before the plateau uplift. In this study, we discuss in detail the patterns of distribution of the
Asian monsoon and arid regions before the plateau uplift on the basis of modeling results without
topography from a global coupled atmosphere–ocean general circulation model, compare our results with
previous simulation studies and available biogeological data, and review the uncertainties in the current
knowledge. Based on what we know at the moment, tropical monsoon climates existed south of 20◦N in
South and Southeast Asia before the plateau uplift, while the East Asian monsoon was entirely absent in the
extratropics. These tropical monsoons mainly resulted from the seasonal shifts of the Inter-Tropical
Convergence Zone.There may have been a quasi-monsoon region in central-southern Siberia. Most of the
arid regions in the Asian continent were limited to the latitudes of 20–40◦N, corresponding to the range of
the subtropical high pressure year-around. In the meantime, the present-day arid regions located in the
relatively high latitudes in Central Asia were most likely absent before the plateau uplift. The main results
from the above modeling analyses are qualitatively consistent with the available biogeological data. These
results highlight the importance of the uplift of the Tibetan Plateau in the Cenozoic evolution of the Asian
climate pattern of dry–wet conditions. Future studies should be focused on effects of the changes in
land–sea distribution and atmospheric CO2 concentrations before and after the plateau uplift, and also on
cross-comparisons between numerical simulations and geological evidence, so that a comprehensive
understanding of the evolution of the Cenozoic paleoenvironments in Asia can be achieved.

Keywords: the Tibetan Plateau, uplift, the Asian monsoons

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