Wang Zhiqiao, Jing Zhao, Song Fengfei
Frontiers Science Center for Deep Ocean Multispheres and Earth System and Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao, China.
Laoshan Laboratory, Qingdao, China.
Nat Commun. 2024 Nov 19;15(1):10020. doi: 10.1038/s41467-024-54394-9.
The surface heat flux feedback, which refers to the response of surface heat flux anomaly to the underlying sea surface temperature anomaly (SSTA), is one of the key processes in air-sea interaction. It plays an important role in regulating various aspects of the climate system, ranging from local SSTA persistence to the global overturning circulation and major climate modes. Yet its change under greenhouse gas-induced warming remains unknown. Here, using an ensemble of global climate simulations under a high radiative forcing scenario, we demonstrate that the intensity of surface heat flux feedback for spatially large-scale SSTA at the midlatitudes is projected to halve by the end of the 21 century, compared to pre-industrial levels. Such weakening is primarily attributed to a more stabilized marine atmospheric boundary layer, which diminishes the air-sea thermal disequilibrium caused by SSTA. In a warming climate, the variance of midlatitude SSTA at large spatial scales is expected to be significantly enhanced in response to the weakened surface heat flux feedback.
表面热通量反馈是海气相互作用中的关键过程之一，它指的是表面热通量异常对下层海表面温度异常（SSTA）的响应。它在调节气候系统的各个方面发挥着重要作用，从局部SSTA的持续性到全球翻转环流和主要气候模态。然而，其在温室气体导致的变暖情况下的变化仍然未知。在这里，我们使用高辐射强迫情景下的全球气候模拟集合，证明到21世纪末，与工业化前水平相比，中纬度地区空间大尺度SSTA的表面热通量反馈强度预计将减半。这种减弱主要归因于海洋大气边界层更加稳定，这减少了由SSTA引起的海气热不平衡。在气候变暖的情况下，由于表面热通量反馈减弱，预计大空间尺度上中纬度SSTA的方差将显著增强。
