Dynamic Potential Intensity: An improved representation of the ocean's impact on tropical cyclones
Dynamic Potential Intensity: An improved representation of the ocean's impact on tropical cyclones
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DOI：
10.1002/2015gl064822
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发表时间：
2015-08-28
影响因子：
5.2
通讯作者：
Zedler, Sarah E.
中科院分区：
文献类型：
--
作者：
Balaguru, Karthik;Foltz, Gregory R.;Zedler, Sarah E.
为了考虑热带气旋（TC）引起的上层海洋混合和海表温度（SST）冷却对TC增强的影响，在海气耦合势强（PI）框架内，提出了一个固定深度的垂直平均温度来代替海表温度。然而，tc引起的混合穿透深度可能随海洋分层和风暴状态而有很大的变化。为了解释这些影响，我们在考虑分层流体湍流的基础上开发了“动态势强度”（DPI）。对于2004-2013年Argo期和北半球的三个主要TC盆地，我们发现DPI解释了11-32%的TC增强方差，而使用以前的方法则为0-16%。使用DPI得到的改善在东太平洋特别大，那里的温跃层较浅，海洋分层效应强。
To incorporate the effects of tropical cyclone (TC)-induced upper ocean mixing and sea surface temperature (SST) cooling on TC intensification, a vertical average of temperature down to a fixed depth was proposed as a replacement for SST within the framework of air-sea coupled Potential Intensity (PI). However, the depth to which TC-induced mixing penetrates may vary substantially with ocean stratification and storm state. To account for these effects, here we develop a "Dynamic Potential Intensity" (DPI) based on considerations of stratified fluid turbulence. For the Argo period 2004-2013 and the three major TC basins of the Northern Hemisphere, we show that the DPI explains 11-32% of the variance in TC intensification, compared to 0-16% using previous methods. The improvement obtained using the DPI is particularly large in the eastern Pacific where the thermocline is shallow and ocean stratification effects are strong.