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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Importance of upper ocean heat content in the intensification and translation speed of cyclones over the Bay of Bengal
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Importance of upper ocean heat content in the intensification and translation speed of cyclones over the Bay of Bengal

机译：孟加拉湾旋风的加速和平移速度中高洋热量的重要性

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It is a well-known fact that the frequency of cyclones is 3–4 times higher over the Bay of Bengal (BOB) compared to the Arabian Sea (AS). Most of these storms generally move in the west-northwesterly direction and some take a recurve and hit Bangladesh. In addition to atmospheric parameters, it is now realized that the upper ocean heat content (UOHC) plays a vital role in the intensification of storms rather than sea-surface temperature (SST). Studies on the intensification of hurricane Opal over warm core rings, and Bret over high heat potential (> 90 kJ/cm2) were reported earlier1,2. Rapid intensification of Nargis over the warm ocean region was reported3 due to high enthalpy flux (300% higher than climatological) and UOHC (77–105 kJ/cm2). A recent study4 showed a negative relationship between the translation speed of a storm (Uh) with UOHC and the depth of 26°Cisotherm (D26) in the western-north Pacific Ocean (PO). Hence UOHC and D26 gained importance in forecasting the intensification and movement of storms. Sadhuram et al.5 showed that a threshold value of about 60 kJ/cm2 may be necessary for the genesis and intensification of the storms in BOB during post-monsoon season.
机译：众所周知的事实是，与阿拉伯海（AS）相比，孟加拉湾（BOB）的气旋频率高3-4倍。这些风暴中的大多数通常朝西北偏西方向移动，有的则反吹并袭击孟加拉国。除了大气参数之外，现在已经认识到，海洋高热量（UOHC）在风暴加剧中起着至关重要的作用，而不是海面温度（SST）。较早报道了关于在暖芯环上飓风蛋白石的强化和在高热势（> 90 kJ / cm2）上的布雷特的研究[1,2]。据报道，由于高的焓通量（比气候高300％）和UOHC（77-105 kJ / cm2），纳尔吉斯在温暖的海洋区域迅速增强。最近的一项研究4显示，风暴（Uh）与UOHC的平移速度与西北太平洋（PO）的26°Cisotherm（D26）深度之间存在负相关。因此，UOHC和D26在预测风暴的加剧和移动方面变得越来越重要。 Sadhuram等人5表明，季风后季节BOB风暴的发生和加剧可能需要大约60 kJ / cm2的阈值。

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