Jet transitions caused multiple abrupt droughts in the Asian summer monsoon margin during Holocene times

Zhong，Yuezhi1,2; Dubois，Nathalie2,3; Xiong，Jianguo1,4,5; Deng，Chenglong6; Zhang，Huiping4; Xiao，Wenjie7; Lu，Honghua8; Hu，Xiu1; Li，Youli1

2022-09-01

10.1016/j.palaeo.2022.111106

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY   Impact Factor & Quartile

0031-0182

1872-616X

The Asian Summer Monsoon (ASM) margin is vulnerable to climate change and a distinct boundary of population and archeological sites exists along the margin. Although lots of studies have been undertaken along the margin, the Holocene history of climate variation is highly debated; for example, whether the climatic optimum occurred in the early Holocene or middle Holocene. In addition, moisture variations on millennial to centennial timescales remain unclear. In this study, we reconstruct moisture variation at the modern junction of the ASM and the Westerlies based on a well-dated (13.3–0.5 ka) loess section in northwest China. On an orbital timescale, moisture variations generally follow changes in insolation with the longest and most intense humid period from 11.3 ka to 8.7 ka, supporting the concept of an early Holocene climatic optimum in the ASM margin. On millennial to centennial timescales, four sequences of long-term gradual wetting and subsequent abrupt drought are noted, i.e., thousands of years were required to reach a favorable environment in the ASM margin, while in only a few hundred years of drought would occur subsequently. Terminations of humid periods correspond to the occurrences of cold events in the North Atlantic realm, indicating an important role for the Atlantic Meridional Overturning Circulation (AMOC) on millennial to centennial timescales. We suggest solar insolation and the AMOC as the dominant factors on orbital timescale and millennial to centennial timescales, respectively. Both factors modulate moisture variations in the ASM margin by influencing the interplay between the ASM and the Westerlies.

Abrupt drought Asian summer monsoon margin Gradual wetting Holocene Moisture variation Multiple paleosol/loess layers

SCI

English

Others

National Natural Science Foundation of China[41888101];National Natural Science Foundation of China[41971002];

Physical Geography ; Geology ; Paleontology

Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology

WOS:000820159700002

ELSEVIER

GEOSCIENCES

2-s2.0-85132432300

Scopus

1.Key Laboratory of Earth Surface Processes of Ministry of Education,Peking University,Beijing,100871,China
2.Department of Earth Sciences,ETH Zurich,Zurich,8092,Switzerland
3.Surface Waters Research and Management,Eawag,Duebendorf,6047,Switzerland
4.State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing,100029,China
5.Guangdong Provincial Key Laboratory of Geodynamics and Geohazards,School of Earth Science and Engineering,Sun Yat-sen University,Guangzhou,510275,China
6.State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China
7.Shenzhen Key Laboratory of Marine Archaea Geo-Omics,Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
8.Key Laboratory of Geographic Information Science of Ministry of Education and Institute of Eco-Chongming (IEC),East China Normal University,Shanghai,200241,China

Zhong，Yuezhi,Dubois，Nathalie,Xiong，Jianguo,et al. Jet transitions caused multiple abrupt droughts in the Asian summer monsoon margin during Holocene times[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2022,601.

Zhong，Yuezhi.,Dubois，Nathalie.,Xiong，Jianguo.,Deng，Chenglong.,Zhang，Huiping.,...&Li，Youli.(2022).Jet transitions caused multiple abrupt droughts in the Asian summer monsoon margin during Holocene times.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,601.

Zhong，Yuezhi,et al."Jet transitions caused multiple abrupt droughts in the Asian summer monsoon margin during Holocene times".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 601(2022).