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<p>The climatological characteristics including seasonal and inter-annual variabilities of life time maximum intensity (LMI) of tropical cyclones (TCs) over the Bay of Bengal (BoB) and Arabian Sea (AS) are analysed based on the data of 1982–2018 (37 years). The average LMI is associated with maximum sustained surface wind speed (MSW) of about 65 knots (kt), over both the BoB and the AS. There is a decrease by about 5-7% in frequency of high intensity storms (LMI of 85–95 kt) over the BoB during post-monsoon season and LMI of 85–95 &amp; 115–125 kt during the year as a whole over the BoB during latter period (2001-18) compared to earlier period (1982–2000). The low intensity TCs (LMI of 35–45 kt) over the AS are higher by about 30% during latter period (2001-18) compared to earlier period (1982–2000) during the post-monsoon season and year as a whole. The westcentral &amp; adjoining eastcentral BoB and central AS are most prone area for LMI. There is a south-southwestward trend in location of LMI (5.2&#xa0;km per year), while there is no trend in location of genesis over BoB during 1982–2018. There is west-southwestward trend in location of LMI and genesis during year as a whole over the AS during 1982–2018. Lower the latitude and higher the longitude of genesis, higher is the LMI over the BoB and lower the longitude of genesis, higher is the LMI over the AS during post-monsoon season. Higher LMI occurs with lower longitude of LMI over the BoB during pre-monsoon season.</p>

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Characteristics of lifetime maximum intensity of tropical cyclones over the North Indian ocean

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • M. Sharma,
  • M Mohapatra,
  • P. Suneetha

摘要

The climatological characteristics including seasonal and inter-annual variabilities of life time maximum intensity (LMI) of tropical cyclones (TCs) over the Bay of Bengal (BoB) and Arabian Sea (AS) are analysed based on the data of 1982–2018 (37 years). The average LMI is associated with maximum sustained surface wind speed (MSW) of about 65 knots (kt), over both the BoB and the AS. There is a decrease by about 5-7% in frequency of high intensity storms (LMI of 85–95 kt) over the BoB during post-monsoon season and LMI of 85–95 & 115–125 kt during the year as a whole over the BoB during latter period (2001-18) compared to earlier period (1982–2000). The low intensity TCs (LMI of 35–45 kt) over the AS are higher by about 30% during latter period (2001-18) compared to earlier period (1982–2000) during the post-monsoon season and year as a whole. The westcentral & adjoining eastcentral BoB and central AS are most prone area for LMI. There is a south-southwestward trend in location of LMI (5.2 km per year), while there is no trend in location of genesis over BoB during 1982–2018. There is west-southwestward trend in location of LMI and genesis during year as a whole over the AS during 1982–2018. Lower the latitude and higher the longitude of genesis, higher is the LMI over the BoB and lower the longitude of genesis, higher is the LMI over the AS during post-monsoon season. Higher LMI occurs with lower longitude of LMI over the BoB during pre-monsoon season.