Atmospheric carbon dioxide, ice sheet and topographic constraints on palaeo moisture availability in Asia
Atmospheric carbon dioxide, ice sheet and topographic constraints on palaeo moisture availability in Asia
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DOI：
10.1016/j.epsl.2019.04.035
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发表时间：
2019-08
影响因子：
5.3
通讯作者：
D. Zoura;D. J. Hill;A. Dolan;S. Hunter;Z. Tang;A. Haywood
中科院分区：
文献类型：
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作者：
D. Zoura;D. J. Hill;A. Dolan;S. Hunter;Z. Tang;A. Haywood
今天，东亚和南亚的水文状况主要是季风，而中亚的特点是干旱。对亚洲干旱开始和季风加强的研究引起了重大辩论，特别是关于季风开始的时间以及这与潜在的因果机制之间的关系。青藏高原的隆升、副特提斯海的退缩以及始新世/渐新世转换后的全球变冷都被认为是亚洲干旱和季风加强的主要驱动力。然而，很少有人知道这些因素的贡献，现代季风行为的发展。在这里，我们第一次进行了一个完全耦合的海洋-大气气候模式（HadCM3）的敏感性模拟，以研究格陵兰岛和南极冰盖的形成，大气二氧化碳（CO2）的变化，以及青藏高原隆起对东亚中亚干旱和季风驱动的降水的影响。我们专注于三个独立的区域，南亚季风，东亚季风和干旱的东中亚，我们提出了年降水周期和水分供应在每个区域。结果表明，在所考察的参数中，青藏高原地形是亚洲水文气候的主要控制因素。此外，我们的研究结果强调，每个强迫的意义取决于水文区域的组成部分和研究的因素，代理解释需要考虑的因素。
Today, the hydrological regime in East and South Asia is dominated by the monsoons, whilst central Asia is characterized as arid. Studies that have examined the onset of aridity and the intensification of the monsoons in Asia have generated significant debate, especially in respect to the timing of monsoon onset and how this relates to the potential causal mechanisms. The uplift of the Tibetan Plateau, the retreat of the Paratethys Sea, and the global cooling after the Eocene/Oligocene transition are all considered major drivers of Asian aridity and monsoonal intensification. However, little is known about each of these factor's contribution to the development of modern monsoon behaviour. Here, for the first time, we perform sensitivity simulations of a fully coupled ocean–atmosphere climate model (HadCM3) to investigate the effect of the Greenland and Antarctic ice-sheets formation, atmospheric carbon dioxide (CO2) variability, and Tibetan Plateau uplift on East Central Asian aridity and monsoon driven precipitation. We focus on three individual regions, the South Asian Monsoon, the East Asian Monsoon and the Arid East Central Asia and we present the annual precipitation cycle and the moisture availability over each region. Our results show that of the parameters investigated the primary control on Asian hydroclimate is the topography of the Tibetan Plateau. Furthermore, our results highlight that the significance of each forcing depends on the component of the hydrological region and factors studied, a factor that proxy interpretation need to take into consideration.