Article (Scientific journals)
Orbital forcing of tropical climate dynamics in the Early Cambrian
Zhang, Tan; Li, Yifan; Fan, Tailiang et al.
2022In Global and Planetary Change, 219, p. 103985
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Keywords :
Astronomical climate forcing; Cambrian; Chaotic solar system; Hadley cell; Milankovitch cycles; Semi-precession; Cambrians; Chaotics; Climate forcings; Early cambrians; Hadley cells; Intertropical convergence zone; Milankovitch cycle; Oceanography; Global and Planetary Change
Abstract :
[en] According to modern atmospheric circulation models, the Intertropical Convergence Zone (ITCZ), as the Earth's meteorological equator, plays an essential role in the low-latitude hydrologic cycles. The limited availability of high-resolution tropical climate archives, especially from the Early Paleozoic Era, severely limits our understanding of ITCZ migration dynamics in deep time. Here we present high-resolution climate-proxy records (i.e., magnetic susceptibility (MS) and Zirconium/Aluminum (Zr/Al)) from tropical marine sediments of the ∼526-million-year-old Qiongzhusi Formation in South China to investigate the link between orbitally forced insolation changes, ITCZ migration dynamics, and low-latitude climate processes. These orbital-scale variations in MS and Zr/Al series are interpreted as alternations between wet and dry cycles, controlled by monsoon intensity under the orbitally forced ITCZ-related paleo-Hadley Cell dynamics. Our results show that combined precession and obliquity orbital cycles had an impact on the Early Cambrian ITCZ migration. Specifically, the precession and obliquity forcing shift the mean position of the ITCZ latitudinally by changing the interhemispheric pressure contrasts, thus affecting the low latitude hydroclimate cycle. We report semi-precession cycles of 8.3–7.9 kyr, which were probably associated with the twice-annual passage of the ITCZ across the intertropical zone, consistent with the paleogeographical location of South China near the equator during the Early Cambrian. Observed ∼1.1 – ∼1.5 Myr eccentricity amplitude modulation (AM) cycles and ∼ 1.0 – ∼1.2 Myr obliquity AM cycles may provide geological evidence for the chaotic motion between Earth and Mars in the Early Cambrian.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Zhang, Tan;  School of Energy Resources, China University of Geosciences (Beijing), Beijing, China ; Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, China University of Geosciences (Beijing), Beijing, China
Li, Yifan;  School of Energy Resources, China University of Geosciences (Beijing), Beijing, China ; Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, China University of Geosciences (Beijing), Beijing, China
Fan, Tailiang;  School of Energy Resources, China University of Geosciences (Beijing), Beijing, China
Da Silva, Anne-Christine  ;  Université de Liège - ULiège > Département de géologie > Pétrologie sédimentaire
Kuang, Mingzhi;  College of Energy, Chengdu University of Technology, Chengdu, China
Liu, Wangwei;  Wuxi Research Institute of Petroleum Geology, Research Institute of Petroleum Exploration and Production, SINOPEC, Wuxi, China
Ma, Chao;  Institute of Sedimentary Geology, State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China
Gao, Qi;  No.4 Oil Production Plant, Changqing Oilfield Company, Yulin, China
Shi, Juye;  School of Energy Resources, China University of Geosciences (Beijing), Beijing, China
Gao, Zhiqian;  School of Energy Resources, China University of Geosciences (Beijing), Beijing, China
Li, Mingsong;  Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing, China
Language :
English
Title :
Orbital forcing of tropical climate dynamics in the Early Cambrian
Publication date :
December 2022
Journal title :
Global and Planetary Change
ISSN :
0921-8181
Publisher :
Elsevier B.V.
Volume :
219
Pages :
103985
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
NSF - National Science Foundation
NSCF - National Natural Science Foundation of China
Chinese Academy of Sciences
F.R.S.-FNRS - Fonds de la Recherche Scientifique
Funding text :
This work is supported by the National Natural Science Foundation of China (Grants U19B6003-01-02 , 41802155 , 42072040 , 41972130 ), the Fundamental Research Funds for the Central Universities ( 2-9-2019-265 and 7100603368 ), Strategic Priority Research Program of the Chinese Academy of Sciences (Grant XDA14010201-02 ), and National Key Research and Development Program of China ( 2021YFA0718200 ). We also would like to thank the project IGCP-652, focusing on improving the Paleozoic time scale. ACDS would like to thank the FNRS ( National Science Foundation , T.0051.19 and J.0037.21 ).
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