中国科学院大气物理研究所姜大膀团队近日的研究发现，新生代印度—太平洋暖池受大气CO₂和古地理共同控制。相关论文于2024年2月23日发表于国际顶尖学术期刊《科学通报》杂志上。

研究人员使用海表温度（SST）记录汇编（主要为中新世中期以来）和多模式古气候模拟，IPWP的范围、强度和最暖温度位置在新生代期间发生了显著变化。具体来说，随着时间的推移，它的范围减小，强度减弱，最温暖的温度位置从印度洋转移到了西太平洋。大气CO₂主导了其范围和强度，而古地理通过限制印度洋的分布和热带海道的宽度，控制了其最温暖温度位置的变化。

较为特别的，研究人员从汇编的SST推断，从中新世中期至中新世晚期，向东移至西太平洋可能是热带海道收缩的结果。此外，通过改变大气热结构和大气环流，IPWP的范围和强度减小，导致西印度洋、东亚和南极洲的年降水量减少，而最暖温度位置从印度洋向西太平洋转移，促进了澳大利亚的干旱化。研究结果强调，定性模型—获得了IPWP海温和区域气候的数据一致性。从过去大气CO₂浓度较高的温暖气候来看，IPWP的扩张和加强将发生在一个更温暖的未来，并有利于东亚和澳大利亚的过度降水。

据悉，印度—太平洋暖池(IPWP)对区域和全球气候至关重要。然而，人们对新生代IPWP的发展及其对区域气候的影响尚不清楚。

附：英文原文

Title: Cenozoic Indo-Pacific warm pool controlled by both atmospheric CO₂ and paleogeography

Author:Ran Zhang, Zhonghui Liu, Dabang Jiang, Yongqiang Yu, Zhongshi Zhang, Yibo Yang, Ning Tan, Dong Si, Qiang Z hang, Xin Zhou

Issue&Volume: 2024/02/23

Abstract: The Indo-Pacific warm pool (IPWP) is crucial for regional and global climates. However, the development of the IPWP and its effect on the regional climate during the Cenozoic remain unclear. Here, using a compilation of sea surface temperature (SST) records (mainly since the middle Miocene) and multimodel paleoclimate simulations, the extent, intensity and warmest temperature position of the IPWP changed markedly during the Cenozoic. Specifically, its extent decreased, its intensity weakened, and its warmest temperature position shifted from the Indian to the western Pacific Ocean over time. The atmospheric CO₂ dominated its extent and intensity, while paleogeography, by restricting the distribution of the Indian Ocean and the width of the tropical seaways, controlled the shifts in its warmest temperature position. In particular, the eastward shift to the western Pacific Ocean from the middle to late Miocene inferred from compiled SST records likely resulted from the constriction of tropical seaways. Furthermore, by changing the atmospheric thermal structure and atmospheric circulation, the reduced extent and intensity of the IPWP decreased the annual precipitation in the western Indian Ocean, eastern Asia and Australia, while the shift in the warmest temperature position from the Indian to western Pacific Ocean promoted aridification in Australia. Qualitative model–data agreements are obtained for both the IPWP SST and regional climate. From the perspective of past warm climates with high concentrations of atmospheric CO₂, the expansion and strengthening of the IPWP will occur in a warmer future and favor excessive precipitation in eastern Asia and Australia.

DOI: 10.1016/j.scib.2024.02.028

Source: https://www.sciencedirect.com/science/article/abs/pii/S2095927324001300