In the present study, an attempt has been made to develop a modified genesis potential index (GPI) by considering the atmospheric parameters of relative humidity (RH), thermal instability (TI), relative vorticity (RV), vertical wind shear (WS) and the ocean parameters of sea surface height (SSH) and upper ocean heat content (UOHC). The new genesis potential index (GPI) is a modified version of the currently used GPI by the India Meteorological Department (IMD), New Delhi for the North Indian Ocean which does not consider the ocean parameters. The main objective of the present study is to examine and improve our earlier GPI (Suneeta and Sadhuram 2018), during southwest monsoon (June–September) and post-monsoon (October–December) seasons for the period 1995–2018, over Bay of Bengal. In addition to UOHC and atmospheric parameters, we have introduced a new term, sea surface height (SSH) to compute the new GPI. Correlations have been computed between GPI and TNDC (total number of depressions, cyclones and severe cyclones) during both the seasons. This new index displayed very high correlation coefficient (CC) r = 0.85 (significant at a level greater than 99%) with the TNDC for the post-monsoon season. But it showed low correlation during SW monsoon season in which the GPI (Kotal et al. 2009) (which considers only atmospheric parameters) showed a correlation of 0.5 which is significant at 95% level. From this, it is inferred that the atmospheric parameters are important during southwest monsoon, while both atmospheric and ocean parameters (UOHC and SSH) appear to be playing important role during post-monsoon season. In this paper, the SSH has been included or the first time in the GPI which showed better performance during post-monsoon season.

在本研究中，通过考虑相对湿度 (RH)、热不稳定性 (TI)、相对涡度 (RV)、垂直风切变 (WS) 等大气参数，已尝试制定修正的成因潜力指数 (GPI)以及海面高度 (SSH) 和上层海洋热含量 (UOHC) 的海洋参数。新的成因潜力指数（GPI）是新德里印度气象局（IMD）目前使用的不考虑海洋参数的北印度洋GPI的修改版本。本研究的主要目的是检查和改进我们早期的 GPI（Suneeta 和 Sadhuram 2018），在 1995 年至 2018 年期间的西南季风（6 月至 9 月）和季风后（10 月至 12 月）季节期间，在海湾地区。孟加拉。除了 UOHC 和大气参数，我们引入了一个新术语，海面高度 (SSH) 来计算新的 GPI。已经计算了两个季节 GPI 和 TNDC（低气压、气旋和强气旋的总数）之间的相关性。这个新指数显示出非常高的相关系数（CC）r  = 0.85（在大于 99% 的水平上显着）与后季风季节的 TNDC。但它在西南季风季节表现出低相关性，其中 GPI（Kotal等人2009）（仅考虑大气参数）显示 0.5 的相关性，在 95% 的水平上是显着的。由此推断，西南季风期间大气参数很重要，而季风后季节大气和海洋参数（UOHC和SSH）似乎都起着重要作用。在本文中，SSH 已被纳入或首次被纳入 GPI，在季风后表现出更好的表现。