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<p>We show strong diurnal variations of precipitation over parts of the tropical Indian Ocean including the northern Bay of Bengal, eastern Arabian Sea (off the west coast of India) and in the equatorial Indian Ocean, and over eastern Himalayan foothills using NASA’s Integrated Multi-Satellite Retrievals for Global Precipitation Mission version 7 (IMERG) rainfall analysis. The amplitudes of these diurnal variations of precipitation over these oceanic regions of the tropical Indian Ocean in the May through September (MJJAS) period exceed that over the neighboring land. Our analysis suggests that these diurnal variations over the oceans (northern Bay of Bengal and southeastern Indian Ocean off the coast of Sumatra) are strongly modulated by the passage of both the high-frequency (10–20&#xa0;days) and the low-frequency (20–70&#xa0;days) Intra-Seasonal Oscillations (ISOs) in the MJJAS period. The diurnal amplitudes over these oceanic regions amplify or dampen during the wet or dry spells of both the high and low frequency ISOs, respectively. We also find that both the ISOs have comparable influence on the diurnal variations. However, the coincidence of the wet spells of both the ISOs further amplifies the diurnal amplitude of the rainfall over northern Bay of Bengal.</p>

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An observational study of the modulation of the diurnal variations by the intraseasonal oscillations of the Indian summer monsoon

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Vasubandhu Misra,
  • C. B. Jayasankar

摘要

We show strong diurnal variations of precipitation over parts of the tropical Indian Ocean including the northern Bay of Bengal, eastern Arabian Sea (off the west coast of India) and in the equatorial Indian Ocean, and over eastern Himalayan foothills using NASA’s Integrated Multi-Satellite Retrievals for Global Precipitation Mission version 7 (IMERG) rainfall analysis. The amplitudes of these diurnal variations of precipitation over these oceanic regions of the tropical Indian Ocean in the May through September (MJJAS) period exceed that over the neighboring land. Our analysis suggests that these diurnal variations over the oceans (northern Bay of Bengal and southeastern Indian Ocean off the coast of Sumatra) are strongly modulated by the passage of both the high-frequency (10–20 days) and the low-frequency (20–70 days) Intra-Seasonal Oscillations (ISOs) in the MJJAS period. The diurnal amplitudes over these oceanic regions amplify or dampen during the wet or dry spells of both the high and low frequency ISOs, respectively. We also find that both the ISOs have comparable influence on the diurnal variations. However, the coincidence of the wet spells of both the ISOs further amplifies the diurnal amplitude of the rainfall over northern Bay of Bengal.