同济大学党皓文和西安交通大学程海合作研究，利用三氧同位素揭示了日照作用力的热带水汽循环。该研究于2024年9月13日发表于国际一流学术期刊《科学进展》杂志。

研究人员对浮游有孔虫的三氧同位素(Δ’¹⁷O)进行了测定，以研究热带西太平洋(WTP)过去21万年的海洋水分动态。Δ’¹⁷O记录主要受岁差周期(约23000年)支配，较低的值反映了较高的湿度与北半球夏季较高的日照作用力。

结合其他地质档案，模拟结果显示，WTP上空增强的水汽辐合在很大程度上，加剧了经向和纬向水文循环的变化，影响了东亚和南美洲北部的降雨模式。研究人员认为日照驱动的WTP湿度动态在调节热带水文气候中起着关键作用。

附：英文原文

Title: Triple oxygen isotope reveals insolation-forced tropical moisture cycles

Author: Lijuan Sha, Haowen Dang, Yue Wang, Jasper A. Wassenburg, Jonathan L. Baker, Hanying Li, Ashish Sinha, Yassine Ait Brahim, Nanping Wu, Zhengyao Lu, Ce Yang, Xiyu Dong, Jiayu Lu, Haiwei Zhang, Sasadhar Mahata, Yanjun Cai, Zhimin Jian, Hai Cheng

Issue&Volume: 2024-09-13

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.

DOI: adp7855

Source: https://www.science.org/doi/10.1126/sciadv.adp7855