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<p>This study examines the contribution of tropical cyclones (TCs) originated in the Arabian Sea (AS) to the seasonal and annual rainfall in AS and India land regions in the period 2000–2020. A total of 32 TCs are occurred and considered during the period, focusing on rainfall within 300&#xa0;km radius from the TC centre. The results show that the oceanic regions experience higher rainfall (20.75 ± 11.7&#xa0;mm/day) compared to that on land (6.89 ± 6.17&#xa0;mm/day). The TC Yemyin (2007) had the highest rainfall over both ocean (62.6&#xa0;mm/day) and land (19.38&#xa0;mm/day) regions. The monsoon (June–September) TCs contribute about 9.69%, whereas the post-monsoon (October–December) TCs contribute 2.85% to the total annual rainfall. Furthermore, the left-top quadrant has the highest rainfall, about 34.37 ± 17.59% of the total TC cases, followed by the left-bottom (31.25 ± 21.51%) and right-top (25.00 ± 15.77%) quadrants. Also, the left-bottom quadrant has 62% during monsoon, left-top quadrant has 50% in pre-monsoon (March–April), and right-top quadrant has 44.44% in post-monsoon seasons. Various environmental factors, including moisture, wind shear, sea surface temperature, TC intensity, and storm translational speed impact the rainfall distribution within TCs. The novelty of this study lies in providing the first detailed analysis of AS storms-induced rainfall, and its quadrant-based distribution and contribution to the total rainfall in each season. These insights are critical for improving TC forecasting and disaster management, particularly because the climate change is expected to intensify storm activity and associated rainfall in the region.</p>

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Analysis of tropical cyclone driven rainfall in the Arabian Sea and its coastal regions for the past two decades (2000–2020)

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  • 发表日期：

    2025年10月31日

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  • R. S. Akhila,
  • J. Kuttippurath,
  • A. Chakraborty

摘要

This study examines the contribution of tropical cyclones (TCs) originated in the Arabian Sea (AS) to the seasonal and annual rainfall in AS and India land regions in the period 2000–2020. A total of 32 TCs are occurred and considered during the period, focusing on rainfall within 300 km radius from the TC centre. The results show that the oceanic regions experience higher rainfall (20.75 ± 11.7 mm/day) compared to that on land (6.89 ± 6.17 mm/day). The TC Yemyin (2007) had the highest rainfall over both ocean (62.6 mm/day) and land (19.38 mm/day) regions. The monsoon (June–September) TCs contribute about 9.69%, whereas the post-monsoon (October–December) TCs contribute 2.85% to the total annual rainfall. Furthermore, the left-top quadrant has the highest rainfall, about 34.37 ± 17.59% of the total TC cases, followed by the left-bottom (31.25 ± 21.51%) and right-top (25.00 ± 15.77%) quadrants. Also, the left-bottom quadrant has 62% during monsoon, left-top quadrant has 50% in pre-monsoon (March–April), and right-top quadrant has 44.44% in post-monsoon seasons. Various environmental factors, including moisture, wind shear, sea surface temperature, TC intensity, and storm translational speed impact the rainfall distribution within TCs. The novelty of this study lies in providing the first detailed analysis of AS storms-induced rainfall, and its quadrant-based distribution and contribution to the total rainfall in each season. These insights are critical for improving TC forecasting and disaster management, particularly because the climate change is expected to intensify storm activity and associated rainfall in the region.