Southward Shift and Intensification of the Intertropical Convergence Zone in the North Pacific Across the Mid‐Pleistocene Transition

Author:

Wang Xingxing1ORCID,Wang Yue1ORCID,Dyez Kelsey A.2ORCID,Ravelo A. Christina3ORCID,Sun Chunxiao1,Liu Fenghao1,Jiang Xiaoying1,Jian Zhimin1ORCID

Affiliation:

1. State Key Laboratory of Marine Geology Tongji University Shanghai China

2. Department of Earth and Environmental Sciences University of Michigan Ann Arbor MI USA

3. Department of Ocean Sciences University of California Santa Cruz CA USA

Abstract

AbstractThe Hadley Circulation and associated westerlies strengthened and moved equatorward across the mid‐Pleistocene transition (MPT). However, the evolution of the intertropical convergence zone (ITCZ) is still elusive due to the scarcity of long‐term hydrological records from regions sensitive to the ITCZ change. Here, high‐resolution sea surface salinity estimates derived from surface‐dwelling planktic foraminiferal δ18O and Mg/Ca in Ocean Drilling Program Site 871 reveal a long‐term freshening trend in the central equatorial Pacific across the MPT. We attribute this secular reorganization of the precipitation‐evaporation balance to the gradual southward migration and intensification of ITCZ in the North Pacific. It is inferred that the long‐term evolution of the ITCZ was modulated by the increased meridional sea surface temperature gradients and the enhancements of trade winds across the MPT.

Funder

National Natural Science Foundation of China

State Key Laboratory of Marine Geology

Tongji University

Publisher

American Geophysical Union (AGU)

Subject

General Earth and Planetary Sciences,Geophysics

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