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| Abstract Submission No. | ABS-2022-14-0340 |
| Title of Abstract | Cyclone-induced rainfall in North Indian Ocean during the period 2000-2020 |
| Authors | Akhila R S*, Jayanarayanan Kuttippurath, Krishnaja P.B, Arun Chakraborty |
| Organisation | Indian Institute ofTechnology Kharagpur |
| Address | CORAL, 6th floor, J C Ghosh PC Ray block, IIT Kharagpur Kharagpur, West bengal, India Pincode: 721302 Mobile: 919645917384 E-mail: akhilarajeev08@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | Tropical cyclones (TCs) are extreme events accompanied by strong winds, heavy rainfall and storm surges. In the North Indian Ocean (NIO), the TCs which made landfall produce heavy to very high rainfall, resulting in coastal flooding. In this study we have used the global precipitation mission (GPM): IMERG precipitation Cal products (2000-2020) to quantify the distribution of rainfall in tropical cyclones formed over NIO, and those made its landfall over the Indian subcontinent. The best-track data are taken from the Indian Meteorological Department (IMD) to analyse the TC activity in this area from 2000 to 2020. A total of 86 cyclones (30 cyclones in Arabian Sea and 56 in Bay of Bengal) have occurred in NIO during this period. The NIO shows maximum TC activity in the months of May, October and November, and the lowest TC activity is observed from January to April and in July. Our analysis suggests that cyclone induced rainfall is higher, when the cyclone reaches its maximum intensity and most of the rainfall is observed near the left side of the track. Tropical cyclones over NIO basin are generally smaller in size in comparison to the similar systems over other oceanic basins. A distance of 300 km from the centre is believed to be adequate to cover the majority of the rainfall associated with TCs. Therefore, we consider the rainfall amount and sectors of radius 150 and 300 km to show the intensity and distribution of the rainfall category in individual sectors for the cyclones. The overall contribution in rainfall due to cyclones is analysed on an interannual and monthly scale. In addition to this, the contribution of different category cyclones to the annual precipitation is also investigated. |