Middle Miocene Intensification of South Asian Monsoonal Rainfall

Xueping Yang; Jeroen Groeneveld; Zhimin Jian; Stephan Steinke; Liviu Giosan

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Middle Miocene Intensification of South Asian Monsoonal Rainfall

机译：南亚季风降雨的中间内部强化

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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 δ~(18)O (δ~(18)Osw) changes reveal a notable gradual increase in SAM rainfall intensity during the middle Miocene. Additionally to this long-term increase in precipitation, the seawater δ~(18)O 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.

机译：在中新世中期，随着南极冰盖的扩张，地球气候从全球暖期（中新世气候最佳期）转变为冷期。这一显著的气候转变也是全球大气环流发生剧烈变化的时期。南亚季风的发展尚未得到充分了解，主要来自风力的代理记录。在11 Ma之前，印度和阿拉伯海几乎不存在中新世中期降雨变化的数据。本研究从东阿拉伯海（EAS）印度西部海岸外NGHP-01 01A站的浮游有孔虫微量元素（Mg/Ca和Ba/Ca）和稳定氧同位素记录，重建了中新世中期南亚季风（SAM）地区的区域地表水文和水气候。Ba/Ca和局部海水δ18o（δ18osw）的变化表明，中新世中期SAM降雨强度显著逐渐增加。除了降水量的长期增加之外，海水δ~（18）O在与南极冰川作用同时发生的~14 Ma处显著减少，即变新鲜。这表明，南大洋中间水域（SOIW）通过“海洋隧道”机制将南极盐度变化传输到阿拉伯海。SAM降雨的中中新世增加与气候模式模拟一致，即从始新世到中/晚中新世，亚洲季风总体增强，在中中新世气候转变后进一步加速。

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来源
《Paleoceanography》 |2020年第12期|共18页
作者
Xueping Yang; Jeroen Groeneveld; Zhimin Jian; Stephan Steinke; Liviu Giosan;
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作者单位

Department of Geological Oceanography and State Key Laboratory of Marine Environmental Science Xiamen University Xiamen China;

Alfred Wegener Institute Helmholtz Center for Polar and Marine Research Potsdam Germany;

State Key Laboratory of Marine Geology Tongji University Shanghai China;

Department of Geological Oceanography and State Key Laboratory of Marine Environmental Science Xiamen University Xiamen China;

Geology and Geophysics Woods Hole Oceanographic Institution Woods Hole MA USA;

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正文语种 eng
中图分类海洋学;
关键词
Middle Miocene Intensification; South Asian; Monsoonal Rainfall;

机译：中部内部强化;南亚;季风降雨;

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2. Intensification of the East Asian Monsoon in Southern China at about 300-400 kaBP Inferred from Eolian Deposits in the Middle-lower Reaches of the Yangtze River [J] . QI Lin, QIAO Yansong, LI Yuehui, 地质学报（英文版） . 2017,第003期
3. Characteristics of Clay Minerals in the Northern South China Sea and Its Implications for Evolution of East Asian Monsoon since Miocene [J] . 万世明, 李安春, 胥可辉, 中国地质大学学报：英文版 . 2008,第001期
4. Interdecadal change in the South Asian summer monsoon rainfall in 2000 and contributions from regional tropical SST [J] . MA Haoyue, ZHU Yali, HUA Wei 大气和海洋科学快报（英文版） . 2019,第006期
5. Leaf physiognomy records the Miocene intensification of the South Asia Monsoon [J] . Bhatia Harshita, Srivastava Gaurav, Spicer R. A., Global and planetary change . 2021,第Jana期

机译：叶片地貌记录了南亚季风的中间体强化
6. Upper ocean hydrographic changes in response to the evolution of the East Asian monsoon in the northern South China Sea during the middle to late Miocene [J] . Yang Ce, Dang Haowen, Zhou Xiaoli, Global and planetary change . 2021,第Juna期

机译：上海南海东亚洲季风进化的上海北京市北部北部的上部后期大洋水文改变
7. Evolution of the South Asian monsoon wind system since the late Middle Miocene [J] . Gupta Anil K., Yuvaraja A., Prakasam M., Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences . 2015,第Null期

机译：中新世中期以来南亚季风系统的演变
8. The Seasonal Change of the Rainfall Patterns in East Asia and its Relationship with the Seasonal Change of the East Asian Summer Monsoon [C] . Tao Shiyan, Zhang Xiaoling International Symposium on Asian Monsoon System(ISAM4); 20040524-29; Kunming(CN) . 2004

机译：东亚降雨方式的季节变化及其与东亚夏季风的季节变化的关系。
9. Effects of Aerosols on Deep Convection and Extreme Rainfall over South China, and East Asian Winter Monsoon [D] . Liu, Zhen. 2019

机译：气溶胶对华南和东亚冬季季风深度对流和极端降雨的影响
10. Late Miocene climate cooling and intensification of southeast Asian winter monsoon [O] . Ann E. Holbourn, Wolfgang Kuhnt, Steven C. Clemens, -1

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11. Late Miocene climate cooling and intensification of southeast Asian winter monsoon [O] . Ann E. Holbourn, Wolfgang Kuhnt, Steven C. Clemens, 2018

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12. Modeling the Influences of Aerosols on Pre-Monsoon Circulation and Rainfall over Southeast Asia. [R] . Lee, D., Sud, Y. C., Oreopoulos, L., 2014

机译：气溶胶对东南亚季风前环流和降水的影响模拟。

Middle Miocene Intensification of South Asian Monsoonal Rainfall

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