Tropical cyclones and transient upper-ocean warming
Tropical cyclones and transient upper-ocean warming
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DOI：
10.1175/2007jcli1550.1
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发表时间：
2008-01-01
影响因子：
4.9
通讯作者：
Emanuel, Kerry
中科院分区：
文献类型：
--
作者：
Pasquero, Claudia;Emanuel, Kerry
强风影响上层海洋的混合和热量分布。反过来，上层海洋热含量影响热带气旋的演变。在这里，作者探讨了热带气旋和上层海洋热含量之间相互作用的全球影响。模拟研究表明，对于给定的大气热力学条件，以强烈（深层混合和大上层海洋热含量）和弱（浅层混合和小热含量）热带气旋活动为特征的状态可以持续。利用全球环流海洋模式研究了热带气旋通过后强混合引起的一次热异常的瞬态演变。结果表明，至少有三分之一的异常在热带地区持续一年以上。然后用一个简单的大气-海洋模式研究了气旋最大风速对海洋垂直温度廓线的敏感性。气旋活动与上层海洋热含量之间的反馈增强了模拟气旋功率耗散对大气热力学条件的敏感性。
Strong winds affect mixing and heat distribution in the upper ocean. In turn, upper-ocean heat content affects the evolution of tropical cyclones. Here the authors explore the global effects of the interplay between tropical cyclones and upper-ocean heat content. The modeling study suggests that, for given atmospheric thermodynamic conditions, regimes characterized by intense (with deep mixing and large upper-ocean heat content) and by weak (with shallow mixing and small heat content) tropical cyclone activity can be sustained. A global general circulation ocean model is used to study the transient evolution of a heat anomaly that develops following the strong mixing induced by the passage of a tropical cyclone. The results suggest that at least one-third of the anomaly remains in the tropical region for more than one year. A simple atmosphere-ocean model is then used to study the sensitivity of maximum wind speed in a cyclone to the oceanic vertical temperature profile. The feedback between cyclone activity and upper-ocean heat content amplifies the sensitivity of modeled cyclone power dissipation to atmospheric thermodynamic conditions.