次表层海洋变率在热带气旋生成中的关键作用
Crucial role of subsurface ocean variability in tropical cyclone genesis
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中文总结 AI 辅助
该研究揭示次表层海洋变率（与26℃等温线深度波动相关）通过调制上层海洋热含量，显著影响全球热带气旋生成，证实二者存在关键关联。
中文摘要 AI 辅助
上层海洋为热带气旋提供热能，但次表层海洋对热带气旋生成的影响长期被忽视。本研究表明，与26℃等温线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，海表风应力及其旋度足够大，可通过夹卷和上升流扰动至百米以下的海洋内部；26℃等温线深度波动可达数十米，显著改变上层海洋热含量，进而在新生热带气旋下方诱导海表温度异常，调制热带气旋生成。研究结果证实了海洋内部变率与热带气旋生成间存在被忽视的关联。
英文摘要
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.
