Climate transition in the Asia inland at 0.8-0.6 Ma related to astronomically forced ice sheet expansion
Knowing the evolution history of the climate systems in the Asian inland dominated by either the Westerlies or the Asian monsoon, and understanding their associated driving mechanisms are crucial for assessing future trends of climate and environmental conditions in this region, but both the evoluti...
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ftunistlouisbrus:oai:dial.uclouvain.be:boreal:243894 2024-05-12T08:05:21+00:00 Climate transition in the Asia inland at 0.8-0.6 Ma related to astronomically forced ice sheet expansion Han W.X Appel E. Galy A. Rosler W. Fang X.M. Zhu X.H. Vandenberghe J. Wang J.J. Berger, André Lu S. Zhang T. UCL - SST/ELI/ELIC - Earth & Climate 2020 http://hdl.handle.net/2078.1/243894 https://doi.org/10.1016/j.quascirev.2020.106580 eng eng boreal:243894 http://hdl.handle.net/2078.1/243894 doi:10.1016/j.quascirev.2020.106580 urn:ISSN:0277-3791 info:eu-repo/semantics/openAccess Quaternary Science Reviews, Vol. 248, no.106580, p. 1-13 (2020) info:eu-repo/semantics/article 2020 ftunistlouisbrus https://doi.org/10.1016/j.quascirev.2020.106580 2024-04-18T17:19:23Z Knowing the evolution history of the climate systems in the Asian inland dominated by either the Westerlies or the Asian monsoon, and understanding their associated driving mechanisms are crucial for assessing future trends of climate and environmental conditions in this region, but both the evolution and mechanisms are still under debate. In this study, we present a comparative analysis of massive data from an accurately dated drill core retrieved from the Westerlies controlled western Qaidam Basin (QB), with records from the Chinese Loess Plateau (CLP) dominated by the East Asia summer monsoon (EASM), to track the time and frequency domain evolution patterns and dynamic changes of the QB and the CLP systems. The results infer two main conclusions. First, a critical transition in the evolution of Qaidam paleolake occurred at 0.8e0.6 Ma, characterized by striking changes in proxy variations and a system shift from periodic variations to more irregular fluctuations after 0.6 Ma. Second, a similar evolution pattern prevailed in the Qaidam paleolake region and in the EASM-dominated CLP between ~2.7 and ~1.2 Ma, but a divergence of both systems started at ~1.2 Ma and fully established after 0.6 Ma, when largely fluctuating climate conditions in the QB with a distinct drying trend was accompanied by synchronous largely fluctuated EASM with an increasing trend after 0.6 Ma. We suggest that ice sheet expansion in the Northern Hemisphere, promoted by co-occurrence of low obliquity amplitudes and low eccentricity, drove both systems across a threshold at ~1.2 Ma, and the internal forcing due to glaciation disturbed the previous response of both systems to solar insolation and led to the divergence of two systems. At ~0.9e0.8 Ma, a node of the 1.2-Myr obliquity cycle co-occurred with an eccentricity minimum, which together with coeval decrease in atmospheric CO2 concentration, could have facilitated a striking expansion of ice sheets. The resulting more equatorial and zonally oriented northern hemisphere westerly jet ... Article in Journal/Newspaper Ice Sheet DIAL@USL-B (Université Saint-Louis, Bruxelles) Quaternary Science Reviews 248 106580 |
institution |
Open Polar |
collection |
DIAL@USL-B (Université Saint-Louis, Bruxelles) |
op_collection_id |
ftunistlouisbrus |
language |
English |
description |
Knowing the evolution history of the climate systems in the Asian inland dominated by either the Westerlies or the Asian monsoon, and understanding their associated driving mechanisms are crucial for assessing future trends of climate and environmental conditions in this region, but both the evolution and mechanisms are still under debate. In this study, we present a comparative analysis of massive data from an accurately dated drill core retrieved from the Westerlies controlled western Qaidam Basin (QB), with records from the Chinese Loess Plateau (CLP) dominated by the East Asia summer monsoon (EASM), to track the time and frequency domain evolution patterns and dynamic changes of the QB and the CLP systems. The results infer two main conclusions. First, a critical transition in the evolution of Qaidam paleolake occurred at 0.8e0.6 Ma, characterized by striking changes in proxy variations and a system shift from periodic variations to more irregular fluctuations after 0.6 Ma. Second, a similar evolution pattern prevailed in the Qaidam paleolake region and in the EASM-dominated CLP between ~2.7 and ~1.2 Ma, but a divergence of both systems started at ~1.2 Ma and fully established after 0.6 Ma, when largely fluctuating climate conditions in the QB with a distinct drying trend was accompanied by synchronous largely fluctuated EASM with an increasing trend after 0.6 Ma. We suggest that ice sheet expansion in the Northern Hemisphere, promoted by co-occurrence of low obliquity amplitudes and low eccentricity, drove both systems across a threshold at ~1.2 Ma, and the internal forcing due to glaciation disturbed the previous response of both systems to solar insolation and led to the divergence of two systems. At ~0.9e0.8 Ma, a node of the 1.2-Myr obliquity cycle co-occurred with an eccentricity minimum, which together with coeval decrease in atmospheric CO2 concentration, could have facilitated a striking expansion of ice sheets. The resulting more equatorial and zonally oriented northern hemisphere westerly jet ... |
author2 |
UCL - SST/ELI/ELIC - Earth & Climate |
format |
Article in Journal/Newspaper |
author |
Han W.X Appel E. Galy A. Rosler W. Fang X.M. Zhu X.H. Vandenberghe J. Wang J.J. Berger, André Lu S. Zhang T. |
spellingShingle |
Han W.X Appel E. Galy A. Rosler W. Fang X.M. Zhu X.H. Vandenberghe J. Wang J.J. Berger, André Lu S. Zhang T. Climate transition in the Asia inland at 0.8-0.6 Ma related to astronomically forced ice sheet expansion |
author_facet |
Han W.X Appel E. Galy A. Rosler W. Fang X.M. Zhu X.H. Vandenberghe J. Wang J.J. Berger, André Lu S. Zhang T. |
author_sort |
Han W.X |
title |
Climate transition in the Asia inland at 0.8-0.6 Ma related to astronomically forced ice sheet expansion |
title_short |
Climate transition in the Asia inland at 0.8-0.6 Ma related to astronomically forced ice sheet expansion |
title_full |
Climate transition in the Asia inland at 0.8-0.6 Ma related to astronomically forced ice sheet expansion |
title_fullStr |
Climate transition in the Asia inland at 0.8-0.6 Ma related to astronomically forced ice sheet expansion |
title_full_unstemmed |
Climate transition in the Asia inland at 0.8-0.6 Ma related to astronomically forced ice sheet expansion |
title_sort |
climate transition in the asia inland at 0.8-0.6 ma related to astronomically forced ice sheet expansion |
publishDate |
2020 |
url |
http://hdl.handle.net/2078.1/243894 https://doi.org/10.1016/j.quascirev.2020.106580 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Quaternary Science Reviews, Vol. 248, no.106580, p. 1-13 (2020) |
op_relation |
boreal:243894 http://hdl.handle.net/2078.1/243894 doi:10.1016/j.quascirev.2020.106580 urn:ISSN:0277-3791 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2020.106580 |
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Quaternary Science Reviews |
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248 |
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106580 |
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1798847632104226816 |