Changes in Tibetan Plateau latitude as an important factor for understanding East Asian climate since the Eocene: A modeling study
Changes in Tibetan Plateau latitude as an important factor for understanding East Asian climate since the Eocene: A modeling study
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DOI：
10.1016/j.epsl.2017.12.034
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发表时间：
2018-02
影响因子：
5.3
通讯作者：
Ran Zhang;D. Jiang;G. Ramstein;Zhongshi Zhang;P. Lippert;Entao Yu
中科院分区：
文献类型：
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作者：
Ran Zhang;D. Jiang;G. Ramstein;Zhongshi Zhang;P. Lippert;Entao Yu
以往的气候模拟研究表明，喜马拉雅-青藏高原（TP）的地表隆起是新生代东亚季风爆发和加强的关键参数。这些研究中的大多数只考虑了喜马拉雅-TP在其目前的位置之间的0.26 °N和0.40 °N，尽管许多最近的地球物理研究，重建喜马拉雅-TP 10°或更多的纬度以南的早第三纪。我们设计了一系列的气候模拟，以探讨东亚气候对喜马拉雅-TP纬度的敏感性。我们的模拟结果表明，东亚气候强烈依赖于喜马拉雅-TP的纬度。亚热带原始喜马拉雅-TP的地表抬升加剧了亚洲内陆地区140 °N以北的干旱，并增加了东亚的降水。相比之下，原始喜马拉雅-TP在热带地区的上升，只有轻微加剧干旱在亚洲内陆以北的0.40 °N，并略有增加降水在东亚地区。重要的是，这种气候敏感性的纬度位置的喜马拉雅-TP是非线性的，特别是对整个东亚的降水。模拟结果表明，当原始高原位于北纬11° ~ 25°N和北纬20° ~ 33°N之间时，东亚地区的降水格局存在显著差异，而当高原从北纬20° ~ 33°N向北平移到现代位置时，东亚地区的降水格局相似。我们的模拟，在中亚的气候代用数据的背景下解释时，支持的古地理重建，现代海拔原始喜马拉雅山-TP的南缘位于北纬120度或更北的始新世。
Previous climate modeling studies suggest that the surface uplift of the Himalaya–Tibetan plateau (TP) is a crucial parameter for the onset and intensification of the East Asian monsoon during the Cenozoic. Most of these studies have only considered the Himalaya–TP in its present location between ∼26°N and ∼40°N despite numerous recent geophysical studies that reconstruct the Himalaya–TP 10° or more of latitude to the south during the early Paleogene. We have designed a series of climate simulations to explore the sensitivity of East Asian climate to the latitude of the Himalaya–TP. Our simulations suggest that the East Asian climate strongly depends on the latitude of the Himalaya–TP. Surface uplift of a proto-Himalaya–TP in the subtropics intensifies aridity throughout inland Asia north of ∼40°N and enhances precipitation over East Asia. In contrast, the rise of a proto-Himalaya–TP in the tropics only slightly intensifies aridity in inland Asia north of ∼40°N, and slightly increases precipitation in East Asia. Importantly, this climate sensitivity to the latitudinal position of the Himalaya–TP is non-linear, particularly for precipitation across East Asia. The simulated precipitation patterns across East Asia are significantly different between our scenarios in which a proto-plateau is situated between ∼11°N and ∼25°N and between ∼20°N and ∼33°N, but they are similar when the plateau translates northward from between ∼20°N and ∼33°N to its modern position. Our simulations, when interpreted in the context of climate proxy data from Central Asia, support geophysically-based paleogeographic reconstructions in which the southern margin of a modern-elevation proto-Himalaya–TP was located at ∼20°N or further north in the Eocene.