北京大学朴世龙团队和中国科学院大气物理研究所李熙晨团队合作研究取得一项新突破。他们的研究揭示了预测青藏高原地表变暗与北极气候变化之间的共振。该项研究成果发表在2023年12月15日出版的《科学通报》上。

本文采用陆地-大气耦合全球气候模式，研究了青藏高原变暗对极地气候变化的影响。研究结果表明，预估的青藏高原变暗有可能产生一个稳定的Rossby波列，从而调节北半球高纬度地区的大气环流，并在北极地区引发类似偶极子的地表气温异常模式。另一项实验结果表明，预测的北极变暖可能反过来使青藏高原变暖，从而在这两个气候系统之间形成双向联系。考虑到它们与巨大的冰储库的联系，在研究中阐明这一机制对于促进研究人员对地球系统气候预测的理解至关重要。

据悉，青藏高原(TP)过去的隆升在百万年的时间尺度上对全球气候产生了深远的影响。然而，青藏高原上正在发生的气候变化，特别是其局部反照率的持续降低(称为“青藏高原表面变暗”)是否会产生全球性影响仍不确定。

附：英文原文

Title: Resonance between projected Tibetan Plateau surface darkening and Arctic climate change

Author: Shuchang Tang, Shilong Piao, David M. Holland, Fei Kan, Tao Wang, Tandong Yao, Xichen Li

Issue&Volume: 2023/12/15

Abstract: The Tibetan Plateau (TP) exerts a profound influence on global climate over million-year timescales due to its past uplift. However, whether the ongoing climate changes over the TP, particularly the persistent reduction in its local albedo (referred to as “TP surface darkening”), can exert global impacts remains elusive. In this study, a state-of-the-art coupled land–atmosphere global climate model has been employed to scrutinize the impact of TP darkening on polar climate changes. Results indicate that the projected TP darkening has the potential to generate a stationary Rossby wave train, thereby modulating the atmospheric circulation in the high-latitudes of the Northern Hemisphere and instigating a dipole-like surface air temperature anomaly pattern around the Arctic region. An additional experiment suggests that the projected Arctic warming may in return warm the TP, thus forming a bi-directional linkage between these two climate systems. Given their association with vast ice reservoirs, the elucidation of this mechanism in our study is crucial in advancing our comprehension of Earth system climate projections.

DOI: 10.1016/j.scib.2023.12.008

Source: https://www.sciencedirect.com/science/article/abs/pii/S2095927323008502