Dominant 100,000-year precipitation cyclicity in a lateMiocene lake from northeast Tibet

East Asian summer monsoon (EASM) precipitation received by northern China over the past 800 thousand years (ky) is characterized by dominant 100-ky periodicity, mainly attributed to CO2 and Northern Hemisphere insolation-driven ice sheet forcing. We established an EASM record in the Late Miocene fro...

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Bibliographic Details
Published in:Science Advances
Main Authors: Nie,JS(Nie,Junsheng), Garzione,C(Garzione,Carmala), Su,QD(Su,Qingda), Liu,QS(Liu,Qingsong), Zhang,R(Zhang,Rui), Heslop, D(Heslop.David), Necula, C(Necula,Cristian), Zhang,SH(Zhang,Shihong), Song,YG(Song,Yougui), Luo,Z(Luo,Zeng), Nie,Junsheng
Format: Report
Language:English
Published: 2017
Subjects:
Antarctica
East Asian Monsoon
Tibetan Plateau
Eccentricity
Ice Sheets
Orbital Forcing
Antarctic
Antarc*
Ice Sheet
Online Access:http://ir.ieecas.cn/handle/361006/5591
https://doi.org/10.1126/sciadv.1600762
Description
Summary:East Asian summer monsoon (EASM) precipitation received by northern China over the past 800 thousand years (ky) is characterized by dominant 100-ky periodicity, mainly attributed to CO2 and Northern Hemisphere insolation-driven ice sheet forcing. We established an EASM record in the Late Miocene from lacustrine sediments in the Qaidam Basin, northern China, which appears to exhibit a dominant 100-ky periodicity similar to the EASM records during the Late Quaternary. Because evidence suggests that partial or ephemeral ice existed in the Northern Hemisphere during the Late Miocene, we attribute the 100-ky cycles to CO2 and Southern Hemisphere insolation-driven Antarctic ice sheet forcing. This indicates a >6-million year earlier onset of the dominant 100-ky Asian monsoon and, likely, glacial and CO2 cycles and may indicate dominant forcing of Northern Hemisphere climate by CO2 and Southern Hemisphere ice sheets in a warm world.

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