Our research results reveal that the slope has driven the zonal movement of the Intertropical Convergence Zone for 410000 years

Article source: Release time:2023-03-10 11:17 Author:李哲萱 Views:157 Automatic translation:yes

&Emsp& Emsp; Recently, Geophysical Research Letters, the flagship of the American Geophysical Union (AGU) and the journal Nature Index (NI), published the latest research achievement of our department's Paleoceanography team, Obliquity Induced Latitude Migration of the Interactive Convergence Zone During the Past ∼ 410 kyr

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Figure 1 Comparison of rainfall records at the south and north edges of the Intertropical Convergence Zone

In order to further reveal the driving mechanism of slope to the Intertropical Convergence Zone, the team combined the above rainfall records with the zonal migration of the subtropical front (STF) in the southern hemisphere, the leakage of the Agulhas Current in southern Africa, and the Atlantic Meridional Overturning Circulation (AMOC) The intensity and other records were compared, and combined with the results of existing model research, it was found that when the slope was high (low), the polar (zonal) migration of the subtropical front in the southern hemisphere would cause the increase (decrease) of the leakage amount of the Egarus flow, thus enhancing (weakening) the Atlantic meridional overturn current, and inducing the decrease (increase) of the sea ice cover in the North Atlantic, which would lead to the northward (southern) migration of the Intertropical Convergence Zone (Figure 2). The proposal of this mechanism provides a new example for a deeper understanding of the high-low latitude sea air linkage


Figure 2 Schematic diagram of the relationship between slope, southern hemisphere subtropical front (STF), Atlantic meridional overturning current (AMOC), North Atlantic sea ice cover (SI) and Intertropical Convergence Zone (ITCZ)

Associate Professor Zhang Peng of our department's ancient ocean team is the first author and corresponding author, and Professor Xu Jian is the co corresponding author. The research collaborators include Professor Ann Holbourn and Wolfgang Kuhnt of Kiel University in Germany, and researchers Li Tiegang and Xiong Zhifang of the First Institute of Oceanography of the Ministry of Natural Resources. The research is funded by the major project of the National Laboratory of Qingdao Marine Science and Technology Pilot (2022QNLM050203) and the National Natural Science Foundation of China Supported by (42176076, 41776060, and 41830539)& Emsp& Emsp

 & Emsp; This article is the second NI journal article published by the team on the subject of hydrology and rainfall in the East Indies Ocean in recent two years, and also the third article published in the Class A journal of the Department of Geology. The links are as follows:

 & Emsp; https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022GL100039

 & Emsp; https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JC017014

 & Emsp; https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019JD032125

 & Emsp; In addition, the team recently published their latest research results on the evolution of the middle layer water in the Indonesian crossflow during the northern hemisphere ice expansion period in the internationally famous journal "Quarternary Science Reviews" in the field of Quaternary research( https://doi.org/10.1016/j.quascirev.2022.107666 ), "China Ocean Discovery Program" was reported( https://mp.weixin.qq.com/s/BESvDCGz3llIxz3m0bxvnw )