The alarming rate of abrupt change in weather parameters, especially rainfall and temperature, is a cause of major concern not only for the scientific community but also for the lives of common people living in a country like India. A broad picture of climate change is not sufficient to carry out an impact assessment on a regional scale. Recent news on the occurrence of floods on a regional scale over India throws an urgent need to look at the patterns of changes in rainfall on a more regional scale. Kerala, the southwestern state of the Indian peninsula, is known to be the gateway of monsoon for the summer monsoon season to the mainland. This study is evaluating the causes of the recent variability in the rainfall pattern over Kerala during the southwest monsoon season. It is found that the Kerala rainfall is decreasing at the rate of 3 mm/year for the past 100 years, with an abrupt decrease of 6.7 mm/year after 1960. The causes of such a decrease are a point of discussion in this study. It is found that the ocean parameters such as sea surface temperature, ocean heat content and ocean heat fluxes are increasing at an alarming rate in the recent decade over the North West Equatorial Indian Ocean, including the Arabian sea. The pattern of the Findlater jet and the ocean response clearly identifies the North West Equatorial Indian Ocean as a hot spot which creates maximum variability in the southwest monsoon dynamics.

天气参数（尤其是降雨量和温度）突然变化的惊人速度不仅是科学界的一个主要问题，也是生活在像印度这样的国家的普通民众的生活的主要问题。气候变化的广泛图景不足以在区域范围内进行影响评估。最近关于印度区域范围内发生洪水的消息，迫切需要在更多区域范围内研究降雨量的变化模式。喀拉拉邦是印度半岛西南部的一个州，众所周知，它是夏季季风季节进入大陆的季风门户。这项研究正在评估西南季风季节期间喀拉拉邦降雨模式最近变化的原因。发现喀拉拉邦的降雨量在过去 100 年中以 3 毫米/年的速度减少，1960 年后突然减少 6.7 毫米/年。这种减少的原因是本研究讨论的一个重点。研究发现，近十年来，包括阿拉伯海在内的西北赤道印度洋的海面温度、海洋热含量和海洋热通量等海洋参数以惊人的速度增加。Findlater 喷流的模式和海洋响应清楚地表明西北赤道印度洋是一个热点，它在西南季风动力学中产生了最大的变化。研究发现，近十年来，包括阿拉伯海在内的西北赤道印度洋的海面温度、海洋热含量和海洋热通量等海洋参数以惊人的速度增加。Findlater 急流的模式和海洋响应清楚地表明西北赤道印度洋是一个热点，它在西南季风动力学中产生了最大的变化。研究发现，近十年来，包括阿拉伯海在内的西北赤道印度洋的海面温度、海洋热含量和海洋热通量等海洋参数以惊人的速度增加。Findlater 喷流的模式和海洋响应清楚地表明西北赤道印度洋是一个热点，它在西南季风动力学中产生了最大的变化。