Gao Cong, Zhou Lei, Lin I-I, Wang Chunzai, Guan Shoude, Jin Fei-Fei, Murtugudde Raghu
School of Oceanography, Shanghai Jiao Tong University, Shanghai, China.
Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, USA.
Nat Commun. 2025 Jan 26;16(1):1050. doi: 10.1038/s41467-025-56433-5.
The upper ocean provides thermal energy to tropical cyclones. However, the impacts of the subsurface ocean on tropical cyclogenesis have been largely overlooked. Here, we show that the subsurface variabilities associated with the variation in the 26 °C isothermal depth have pronounced impacts on tropical cyclogenesis over global oceans. The sea surface wind stress and its curl before tropical cyclogenesis are large enough to perturb the ocean interior down to more than one hundred meters due to entrainment and upwelling. The 26 °C isothermal depth can fluctuate by tens of meters to significantly modify the upper ocean heat content. Consequently, sea surface temperature anomalies under nascent tropical cyclones are induced, and tropical cyclogenesis is modulated. Our results substantiate an unexpected relation between ocean interior variations and tropical cyclogenesis.
上层海洋为热带气旋提供热能。然而，次表层海洋对热带气旋生成的影响在很大程度上被忽视了。在这里，我们表明，与26°C等温深度变化相关的次表层变率对全球海洋上的热带气旋生成有显著影响。热带气旋生成前的海面风应力及其旋度足够大，由于夹卷和上升流作用，可扰动海洋内部达一百多米深。26°C等温深度可波动数十米，从而显著改变上层海洋热含量。因此，新生热带气旋下的海表面温度异常被诱发，热带气旋生成也受到调制。我们的结果证实了海洋内部变化与热带气旋生成之间存在意想不到的关系。
