In this study, we investigated the moisture sources for precipitation through a Lagrangian approach during the genesis, intensification, and dissipation phases of all tropical cyclones (TCs) that occurred over the two hemispheric sub-basins of the Indian Ocean (IO) from 1980 to 2018. In the North IO (NIO), TCs formed and reached their maximum intensity on both sides of the Indian Peninsula, to the east in the Bay of Bengal (BoB), and to the west in the Arabian Sea (AS). The oceanic areas where TCs occurred were their main moisture sources for precipitation associated with TCs. Additionally, for TCs over the BoB, continental sources from the Ganges River basin and the South China Sea also played a notable role; for TCs over the AS, the Somali Low-Level jet (along the African coast in a northerly direction) also acted as an essential moisture transport. In the South IO (SIO), the western, central, and eastern basins were identified as the preferred areas for the genesis and development of TCs. During TC activity, the central IO and the Wharton and Perth basins mostly supplied atmospheric moisture. The Mascarene High circulation was the main moisture transport mechanism for the precipitation of TCs formed in the SIO basin. In both basins, during their intensification process, TCs gained more moisture (even more intensely when reaching the hurricane category) than during the genesis or dissipation stages. Additionally, the modulation during monsoonal seasons of the moisture contribution to the TCs was more noticeable over the NIO basin than for the SIO. Overall, the moisture uptake for precipitation from the sources for TCs occurred slightly faster in the NIO basin than in the SIO basin.

在这项研究中，我们通过拉格朗日方法研究了 1980 年至 1980 年印度洋 (IO) 两个半球次盆地发生的所有热带气旋 (TC) 的形成、加强和消散阶段降水的水分来源。 2018. 在北伊奥（NIO），热带气旋在印度半岛两侧形成并达到最大强度，东至孟加拉湾（BoB），西至阿拉伯海（AS）。台风发生的海域是台风相关降水的主要水分来源。此外，对于 BoB 上空的 TC，恒河盆地和南海的大陆源也发挥了显着作用；对于 AS 上的 TC，索马里低空喷气机（沿非洲海岸向北）也充当了重要的水分运输工具。在南IO（SIO），西部、中部和东部盆地被确定为TC成因和发展的优选区域。在 TC 活动期间，中部 IO 以及沃顿和珀斯盆地主要供应大气水分。Mascarene High 环流是 SIO 盆地形成的 TC 降水的主要水分输送机制。在这两个盆地中，在其强化过程中​​，TCs 获得的水分比在成因或消散阶段获得的水分更多（在达到飓风类别时甚至更加强烈）。此外，季风季节水分对 TC 的贡献在 NIO 盆地比 SIO 更明显。全面的，