ABSTRACT Tropical Cyclone Heat Potential (TCHP) is the heat content relative to 26°C isotherm, which is important in the development of cyclone. Cyclonic events last for few weeks and become intensified within few days or in some cases few hours. To study such low pressure systems, daily TCHP is required which is created in our study using Two Layer Gravity Model (TLGM) using monthly climatologies of temperature and salinity profiles, daily Sea Surface Height Anomaly (SSHA) and daily Sea Surface Temperature (SST). This satellite-based data of SSHA and SST are used to create daily TCHP fields which are validated using collocated ARGO in-situ data. ARGO derived TCHP and TLGM TCHP showed correlation coefficient , which indicates that TLGM can be used for near real time TCHP calculation for cyclone studies. Analysis done on 92 non-developing and 93 developing systems shows that, on the day of formation of depression, average TCHP is 89.3 kJ cm for developing systems while average TCHP is 78.3 kJ cm for non-developing systems in North Indian Ocean (NIO). Minimum TCHP was found to be 27.2 kJ cm and 28.6 kJ cm for developing and non developing systems out of 93 and 92 cases, respectively. Further, Genesis Potential Parameter (GPP) using low-level relative vorticity, middle troposphere relative humidity, middle troposphere temperature instability and vertical wind shear is created based on past similar studies, but with six hourly as well as daily resolution (1993 to 2017) and 0.125° 0.125° spatial resolution. Using daily TCHP, another index called Genesis Potential Index (GPI) is created and then both the GPP and GPI are analysed for 93 developing and 92 non-developing systems in north Indian ocean from the year 1993 to 2017. Our study shows that both are good predictors for the lead periods of less than 2 days, while for the lead periods of more than 2 days, the distinction becomes difficult between developing and non-developing systems. Abbreviations: TLGM - Two Layer Gravity Model; TCHP - Tropical Cyclone Heat Potential; - Depth of 26°C isotherm; - Depth of 20°C isotherm; NIO - North Indian Ocean; AS - Arabian Sea; India Meteorological Department - IMD; BOB - Bay of Bengal

中文翻译：

---

使用卫星导出的北印度洋每日热带气旋热势的成因势参数

摘要 热带气旋热势 (TCHP) 是相对于 26°C 等温线的热含量，这对气旋的发展很重要。气旋事件持续数周，并在几天内或在某些情况下几小时内加剧。为了研究这种低压系统，需要使用两层重力模型 (TLGM) 在我们的研究中创建每日 TCHP，使用温度和盐度剖面的每月气候学、每日海面高度异常 (SSHA) 和每日海面温度 (SST) . 这种基于卫星的 SSHA 和 SST 数据用于创建每日 TCHP 字段，这些字段使用并置的 ARGO 现场数据进行验证。ARGO 导出的TCHP 和TLGM TCHP 显示相关系数，这表明TLGM 可用于气旋研究的近实时TCHP 计算。对92个非开发系统和93个开发系统进行的分析表明，在凹陷形成当天，北印度洋（NIO）开发系统的平均TCHP为89.3 kJ cm，非开发系统的平均TCHP为78.3 kJ cm . 在 93 例和 92 例中，显影和非显影系统的最小 TCHP 分别为 27.2 kJ cm 和 28.6 kJ cm。此外，使用低层相对涡度、中对流层相对湿度、中对流层温度不稳定性和垂直风切变的创世纪位势参数 (GPP) 是基于过去的类似研究创建的，但具有 6 小时和每日分辨率（1993 年至 2017 年）和 0.125° 0.125° 空间分辨率。使用每日TCHP，创建了另一个名为创世潜力指数 (GPI) 的指数，然后分析了 1993 年至 2017 年北印度洋 93 个发展中系统和 92 个非发展中系统的 GPP 和 GPI。提前期少于2天，而超过2天的提前期，很难区分开发和非开发系统。缩写：TLGM——两层重力模型；TCHP——热带气旋热势；- 26°C等温线的深度；- 20°C等温线的深度；NIO——北印度洋；AS——阿拉伯海；印度气象局 - IMD；BOB - 孟加拉湾 而对于超过 2 天的前置期，开发和非开发系统之间的区别变得困难。缩写：TLGM——两层重力模型；TCHP——热带气旋热势；- 26°C等温线的深度；- 20°C等温线的深度；NIO——北印度洋；AS——阿拉伯海；印度气象局 - IMD；BOB - 孟加拉湾 而对于超过 2 天的前置期，开发和非开发系统之间的区别变得困难。缩写：TLGM——两层重力模型；TCHP——热带气旋热势；- 26°C等温线的深度；- 20°C等温线的深度；NIO——北印度洋；AS——阿拉伯海；印度气象局 - IMD；BOB - 孟加拉湾