<p>Tauktae, a category-4 pre-monsoon tropical cyclone, originated over the Arabian Sea (AS), and made landfall in Gujarat, India on 17 May 2021, causing the loss of livelihoods, property and the economy in the region. In this study, the in-situ buoy and satellite observations are explored to analyse the conducive ocean condition before the formation of the cyclone primarily from the air–sea interaction perspective. Impacts of the storm during and after the passage of the cyclone are also observed using satellite measurements and numerical models. The warming observed in AS prior to the event is due to the substantial freshening of around 1PSU with respect to previous years causing stratification, near the coasts of Kerala and Karnataka. Buoy observations at AD10 during the formation and intensification of Cyclone Tauktae revealed surface cooling of approximately 1&#xa0;°C and an increase in surface salinity by 0.5–1 PSU associated with the cyclone’s passage. The predicted storm surge height is estimated to be 2–4&#xa0;m during the landfall of Tauktae cyclone, which is in good agreement with the India Meteorological Department report. Similarly, model predicted significant wave height closely matches with the in-situ buoy observations.</p>

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Observing Ocean Conditions: Prior and Post Cyclone ‘Tauktae’ Using Satellite and In-situ Data

  • Kesavakumar Balakrishnan,
  • Suchandra Aich Bhowmick,
  • Venkatesan Ramasamy,
  • Shanmugam Palanisamy,
  • Ram Kumar Giri,
  • M. Jishad,
  • Anup Kumar Mandal,
  • M. Seemanth,
  • Rishi Gangwar,
  • Neeraj Agarwal,
  • Rashmi Sharma,
  • Sundar Ranganathan,
  • Ramesh Krishnamoorthy

摘要

Tauktae, a category-4 pre-monsoon tropical cyclone, originated over the Arabian Sea (AS), and made landfall in Gujarat, India on 17 May 2021, causing the loss of livelihoods, property and the economy in the region. In this study, the in-situ buoy and satellite observations are explored to analyse the conducive ocean condition before the formation of the cyclone primarily from the air–sea interaction perspective. Impacts of the storm during and after the passage of the cyclone are also observed using satellite measurements and numerical models. The warming observed in AS prior to the event is due to the substantial freshening of around 1PSU with respect to previous years causing stratification, near the coasts of Kerala and Karnataka. Buoy observations at AD10 during the formation and intensification of Cyclone Tauktae revealed surface cooling of approximately 1 °C and an increase in surface salinity by 0.5–1 PSU associated with the cyclone’s passage. The predicted storm surge height is estimated to be 2–4 m during the landfall of Tauktae cyclone, which is in good agreement with the India Meteorological Department report. Similarly, model predicted significant wave height closely matches with the in-situ buoy observations.