Sha Lijuan, Dang Haowen, Wang Yue, Wassenburg Jasper A, Baker Jonathan L, Li Hanying, Sinha Ashish, Ait Brahim Yassine, Wu Nanping, Lu Zhengyao, Yang Ce, Dong Xiyu, Lu Jiayu, Zhang Haiwei, Mahata Sasadhar, Cai Yanjun, Jian Zhimin, Cheng Hai
Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China.
State Key Laboratory of Marine Geology, Tongji University, Shanghai, China.
Sci Adv. 2024 Sep 13;10(37):eadp7855. doi: 10.1126/sciadv.adp7855. Epub 2024 Sep 11.
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'O). The Δ'O 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.
热带海洋是全球主要的水汽和潜热来源，但其对辐射强迫的响应仍不清楚。在此，我们通过浮游有孔虫三重氧同位素（Δ'O）方法，研究了过去21万年西热带太平洋（WTP）的海洋水汽动态。Δ'O记录主要由岁差周期（约23000年）主导，较低的值反映了与北半球夏季日照增加相一致的较高湿度。我们的实证和模型结果，结合其他地质档案，表明WTP上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。我们认为，日照驱动的WTP水汽动态在调节热带水文气候方面起着关键作用。
