Lijuan Sha1, Haowen Dang2,*, Yue Wang2, Jasper A. Wassenburg3,4, Jonathan L. Baker1,5,Hanying Li1, Ashish Sinha6, Yassine Ait Brahim7, Nanping Wu8,9, Zhengyao Lu10,Ce Yang11, Xiyu Dong1, Jiayu Lu12, Haiwei Zhang1, Sasadhar Mahata1,Yanjun Cai1, Zhimin Jian2, Hai Cheng1,13,*
1Institute of Global environmental change, Xi’an Jiaotong University, Xi’an, china.
2State Key laboratory of Marine Geology, tongji University, Shanghai, china.
3Center for climate Physics, institute for Basic Science, Busan, Republic of Korea.
4Pusannational University, Busan, Republic of Korea.
5Institute of Geology, University ofinnsbruck, innrain 52, innsbruck 6020, Austria.
6Department of earth Sciences,california State University dominguez hills, carson, cA, USA.
7International WaterResearch institute, Mohammed vi Polytechnic University, Ben Guerir, Morocco.
8Institute of deep-Sea Science and engineering, chinese Academy of Sciences,hainan, china.
9School of earth, Atmosphere and environment, Monash University,clayton, vic 3800, Australia.
10Department of Physical Geography and ecosystemScience, lund University, lund, Sweden.
11State Key laboratory of continentaldynamics, department of Geology, northwest University, Xi’an, china.
12Jiangsucoastal development Research institute, Yancheng teachers University, Yancheng,china.
13State Key laboratory of loess and Quaternary Geology, institute of earthenvironment, chinese Academy of Sciences, Xi’an, china.
*Corresponding author.
E-mail address:cheng021@xjtu.edu.cn (h.c.); hwdang@tongji.edu.cn (h.d.)
Abstract:
Tropical oceans are the main global water vapor and latent heat sources, but their responses to radiative forcing remain unclear. Here, we investigate oceanic moisture dynamics of the western tropical Pacific (WTP) over the past 210,000 years through an approach of planktonic foraminiferal triple oxygen isotope (Δ′17O). The Δ′17O record is dominated by the precession cycles (~23,000 years), with lower values reflecting higher humidity in concert with higher Northern Hemisphere summer insolation. Our empirical and modeling results, combined with other geological archives, suggest that the enhanced moisture convergence over the WTP largely intensifies changes in the meridional and zonal hydrological cycles, affecting rainfall patterns in East Asia and northern South America. We propose that the insolation-driven WTP moisture dynamics play a pivotal role in regulating tropical hydroclimate.
Full Airticle: https://www.science.org/doi/10.1126/sciadv.adp7855
Fig. Precession dominated changes in Δ′17O and δ18Osw-ive records.
