Middle Miocene Intensification of South Asian Monsoonal Rainfall
Middle Miocene Intensification of South Asian Monsoonal Rainfall
复制标题
中中新世南亚季风降雨加强
DOI：
10.1029/2020pa003853
复制
发表时间：
2020-11
影响因子：
3.5
通讯作者：
Liviu Giosan
中科院分区：
文献类型：
--
作者：
Xueping Yang;Jeroen Groeneveld;Zhimin Jian;Stephan Steinke;Liviu Giosan
在中新世中期，随着南极冰盖的扩张，地球的气候从一个全球温暖期（中新世气候适宜期）转变为一个较寒冷的时期。这一显著的气候转变也是全球大气发生剧烈变化的时期。
During the middle Miocene, Earth's climate changed from a global warm period (Miocene Climatic Optimum) into a colder one with the expansion of the Antarctic ice sheet. This prominent climate transition was also a period of drastic changes in global atmospheric circulation. The development of the South Asian monsoon is not well understood and mainly derived from proxy records of wind strength. Data for middle Miocene changes in rainfall are virtually non‐existent for India and the Arabian Sea prior to 11 Ma. This study presents planktic foraminiferal trace element (Mg/Ca and Ba/Ca) and stable oxygen isotope records from NGHP‐01 Site 01A off the coast of West India in the Eastern Arabian Sea (EAS) to reconstruct the regional surface hydrography and hydroclimate in the South Asian monsoon (SAM) region during the middle Miocene. The Ba/Ca and local seawater δ18O (δ18Osw) changes reveal a notable gradual increase in SAM rainfall intensity during the middle Miocene. Additionally to this long‐term increase in precipitation, the seawater δ18O is punctuated by a prominent decrease, i.e. freshening, at ~14 Ma contemporary with Antarctic glaciation. This suggests that Southern Ocean Intermediate Waters (SOIW) transmitted Antarctic salinity changes into the Arabian Sea via an “oceanic tunnel” mechanism. The middle Miocene increase in SAM rainfall is consistent with climate model simulations of an overall strengthening Asian monsoon from the Eocene to the middle/late Miocene with a further acceleration after the middle Miocene climate transition.
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影响因子：
--
作者：
T. Prasad;M. Ikeda;S. P. Kumar
通讯作者：
T. Prasad;M. Ikeda;S. P. Kumar
影响因子：
5.2
作者：
Zhengyu Liu;Haijun Yang
通讯作者：
Zhengyu Liu;Haijun Yang
影响因子：
5.8
作者：
A. Draut;P. Clift
通讯作者：
A. Draut;P. Clift
影响因子：
2.3
作者：
N. Shackleton;N. Opdyke
通讯作者：
N. Shackleton;N. Opdyke
DOI：
10.1016/s0031-0182(00)00149-8
发表时间：
2000-11-15
影响因子：
3
作者：
Hoorn, C;Ohja, T;Quade, J
通讯作者：
Quade, J