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Climate of the Past An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/cp-2020-53
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2020-53
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 24 Apr 2020

Submitted as: research article | 24 Apr 2020

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This preprint is currently under review for the journal CP.

Synergy of the westerly winds and monsoons in lake evolution of global closed basins since the Last Glacial Maximum

Yu Li and Yuxin Zhang Yu Li and Yuxin Zhang
  • Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Center for Hydrologic Cycle and Water Resources in Arid Region, Lanzhou University, China

Abstract. Monsoon system and westerly circulation, to which climate change responds differently, are two important components of global atmospheric circulation, interacting with each other in the mid-to-low latitudes and having synergy effect to those regions. Relevant researches on global millennial-scale climate change in monsoon and westerlies regions are mostly devoted to multi-proxy analyses of lakes, stalagmites, ice cores, marine and eolian sediments. Different responses from these proxies to long-term environmental change make understanding climate change pattern in monsoonal and westerlies regions difficult. Accordingly, we disaggregated global closed basins into areas governed by monsoon and westerly winds and unified palaeoclimate indicators, as well as combined with the lake models and paleoclimate simulations for tracking millennial-scale evolution characteristics and mechanisms of global monsoon and westerly winds since the Last Glacial Maximum (LGM). Our results concluded that the effective moisture in most closed basins of the mid-latitudes Northern Hemisphere is mainly a trend on the decrease since the LGM, and of the low-latitudes is mainly a trend on the rise. Millennial-scale water balance change exhibits an obvious boundary between global westerlies and monsoon regions in closed basins, particularly in the Northern Hemisphere. In the monsoon dominated closed basins of the Northern Hemisphere, humid climate prevails in the early-mid Holocene and relative dry climate appears in the LGM and late Holocene. While in the westerly winds dominated closed basins of the Northern Hemisphere, climate is characterized by relative humid LGM and mid-Holocene (MH) compared with the dry early Holocene, which is likely to be connected with precipitation brought by the westerly circulation. This study provides insights into long-term evolution and synergy of monsoon and westerly wind systems and basis for projection of future hydrological balance in the low-to-mid latitudes.

Yu Li and Yuxin Zhang

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Yu Li and Yuxin Zhang

Yu Li and Yuxin Zhang

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Latest update: 02 Jun 2020
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Short summary
Monsoons and westerly winds interact with each other in the mid-to-low latitudes. We track millennial-scale evolution characteristics of monsoon and westerly winds since the past 21 000 years. In the monsoon dominated regions of the Northern Hemisphere, humid climate prevails in the past 10 000–6000 years. While in the westerly winds dominated regions of the Northern Hemisphere, climate is characterized by relative humid around the past 21 000 years and 6000 years.
Monsoons and westerly winds interact with each other in the mid-to-low latitudes. We track...
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