Gu Xihui, Jiang Zaiming, Guan Yansong, Luo Ming, Li Jianfeng, Wang Lunche, Zhang Xiang, Kong Dongdong, Wang Liangyi
State Key Laboratory of Geomicrobiology and Environmental Changes, China University of Geosciences, Wuhan, China.
Hubei Key Laboratory of Regional Ecology and Environmental Change, School of Geography and Information Engineering, China University of Geosciences, Wuhan, China.
Nat Commun. 2025 Apr 10;16(1):3400. doi: 10.1038/s41467-025-58586-9.
Anthropogenic warming has exacerbated atmospheric heatwaves globally, yet the transboundary migration of heatwaves between land and ocean, along with the anthropogenic influence on this process, remain unclear. Here, we employ a Lagrangian tracking approach to identify and track spatiotemporally contiguous warm-season heatwaves in both reanalyses and simulations. This way, we show that land-ocean transboundary heatwaves, especially in the tropics, exhibit longer persistence, wider areal extent, and greater intensity than those confined to land or ocean. These transboundary migrations are primarily driven by the movement of high-pressure systems (such as the westward extension of subtropical highs) and the propagation of Rossby waves. Associated with increasing greenhouse gas concentrations, the frequency of tropical heatwave migrations has increased over the past four decades, and is projected to accelerate further in the twenty-first century under the high-emissions scenario. Anthropogenically-driven landward migrations are amplified by stronger landward winds that drive heat advection, while oceanward processes are likely intensified by increased land-ocean temperature gradient. These intensified transboundary heatwaves not only accentuate humid heat risks for humans but also threaten ecosystems.
人为变暖加剧了全球大气热浪，然而热浪在陆地和海洋之间的跨界迁移以及人为因素对这一过程的影响仍不明确。在这里，我们采用拉格朗日追踪方法来识别和追踪再分析数据及模拟中的时空连续暖季热浪。通过这种方式，我们发现陆地 - 海洋跨界热浪，尤其是在热带地区，比局限于陆地或海洋的热浪具有更长的持续时间、更广的面积范围和更强的强度。这些跨界迁移主要由高压系统的移动（如副热带高压的向西延伸）和罗斯贝波的传播驱动。随着温室气体浓度增加，在过去四十年中热带热浪迁移的频率有所上升，并且在高排放情景下预计在21世纪将进一步加速。人为驱动的向陆迁移因驱动热量平流的更强向陆风而加剧，而向海过程可能因陆地 - 海洋温度梯度增加而增强。这些加剧的跨界热浪不仅加剧了对人类的湿热风险，还威胁着生态系统。
