Arid
DOI10.1130/G38267.1
The Neogene de-greening of Central Asia
Caves, Jeremy K.1; Moragne, Danielle Y.2; Ibarra, Daniel E.1; Bayshashov, Bolat U.3; Gao, Yuan4; Jones, Matthew M.5; Zhamangara, Aizhan6; Arzhannikova, Anastasia V.7; Arzhannikov, Sergey G.7; Chamberlain, C. Page1
通讯作者Caves, Jeremy K.
来源期刊GEOLOGY
ISSN0091-7613
EISSN1943-2682
出版年2016
卷号44期号:11页码:887-890
英文摘要

There remains substantial debate concerning the relative roles of tectonics and global climate in driving the evolution of climate in Central Asia. Today, interior Asia-including the Taklamakan, Gobi, and Ordos Deserts-is exceptionally arid and is surrounded by distinct rainfall boundaries, such as those generated by the Asian monsoon systems to the east and south and those generated by high topography to the north and west. Determining how and why these boundaries have varied over the Neogene is hindered by the lack of a single proxy that can be broadly applied through space and time. We construct isoscapes of pedogenic carbonate delta C-13 (delta C-13(c)) over the Neogene in Asia by combining a compilation of 2236 published measurements with new data from three localities in northern Central Asia. Pedogenic carbonate delta C-13 records local aridity-excepting localities impacted by C-4 grasslands and during large changes in atmospheric pCO(2)-through variations in soil respiration, depth of carbonate formation, and the effect of water stress on plant delta C-13. Together, these effects reflect changes in both primary productivity and mean annual precipitation. Throughout the Neogene, we find consistent and exceptionally high delta C-13(c) in interior Asia with a ring of lower delta C-13(c) that demarcates higher precipitation. This persistent ring of lower delta C-13(c) corresponds in the south and east with the influence of the Asian monsoon systems; in the west and north, it reflects both orographic rainfall due to uplift of the Tian Shan and to moisture delivery by the mid-latitude westerlies. Finally, delta C-13(c) and, hence, aridity increases regionally in the latest Neogene, reflecting the effects of Northern Hemisphere glaciation and cooling. This widespread "de-greening" would have increased regional albedo and modified basin-scale water balances, resulting in greater dust fluxes due to reduced vegetative cover and precipitation.


类型Article
语种英语
国家USA ; Kazakhstan ; Peoples R China ; Russia
收录类别SCI-E
WOS记录号WOS:000386121200002
WOS关键词PEDOGENIC CARBONATE ; SOIL CARBONATES ; CLIMATE ; ARIDIFICATION ; MIOCENE ; BASIN ; MA ; MONSOONS ; CHINA ; ONSET
WOS类目Geology
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/193226
作者单位1.Stanford Univ, Earth Syst Sci, Stanford, CA 94305 USA;
2.Dartmouth Coll, Earth Sci, Hanover, NH 03755 USA;
3.Comm Sci MES, Inst Zool, Alma Ata 050060, Kazakhstan;
4.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China;
5.Northwestern Univ, Earth & Planetary Sci, Evanston, IL 60208 USA;
6.LN Gumilyov Eurasian Natl Univ, Fac Nat Sci, Astana 010000, Kazakhstan;
7.SB RAS, Inst Earths Crust, Irkutsk 664033, Russia
推荐引用方式
GB/T 7714
Caves, Jeremy K.,Moragne, Danielle Y.,Ibarra, Daniel E.,et al. The Neogene de-greening of Central Asia[J],2016,44(11):887-890.
APA Caves, Jeremy K..,Moragne, Danielle Y..,Ibarra, Daniel E..,Bayshashov, Bolat U..,Gao, Yuan.,...&Chamberlain, C. Page.(2016).The Neogene de-greening of Central Asia.GEOLOGY,44(11),887-890.
MLA Caves, Jeremy K.,et al."The Neogene de-greening of Central Asia".GEOLOGY 44.11(2016):887-890.
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