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Impacts of ENSO and IOD on tropical cyclone activity in the Bay of Bengal

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Abstract

The impacts of El Niño-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) on tropical cyclone (TC) activity (intensity, frequency, genesis location, track and average lifetime) in the Bay of Bengal (BoB) are studied for the period 1891–2007 using cyclone e-Atlas of India Meteorological Department, Niño3.4 Index, Oceanic Niño Index and Dipole Mode Index (DMI). TCs in the present study include cyclones with maximum sustainable wind (MSW) ≥34 knots (referred as cyclonic storms) and severe cyclonic storms with MSW ≥48 knots. The study shows a total of 502 TCs over BoB during the 117-year study period at the rate of 4.29 TC per year. Seven-year running mean of TCs for the period 1891–2007 shows a decreasing trend. Correlation between Niño3.4 Index and DMI for the 117-year period is significant and positive and the significance level is higher (lower) for the period with higher (lower) TC frequencies. One-third monthly interval analysis for the 117-year period indicates first third (1–10) of November as the most favoured period of TC formation over BoB. 117-year study period is divided into years of ENSO (El Niño, La Niña and neutral ENSO) and IOD (+ve IOD, −ve IOD and no IOD) categories. Maximum frequency of TC is observed during La Niña years, −ve IOD years and also when La Niña co-occurred with −ve IOD. More severe cyclones are formed during La Niña and +ve IOD years. Genesis location of TCs indicates that during La Niña (El Niño) years, the TCs are oriented in the south-east–north-west (south-west–north-east) direction. TCs in no IOD and −ve (+ve) IOD years are more (less) in northern BoB (north of 15° N), while in southern BoB (south of 15° N), TCs are more (less) during no IOD and +ve (−ve) IOD condition. BoB is divided into four quadrants, and number of TCs in each quadrant is computed under different ENSO–IOD events. Peak direction of track movement is observed as north-east followed by north–north-west which is corroborated from the dissipation of TCs in the specific quadrant. Total TC tracks in the peak direction of track movement are maximum during El Niño and no IOD years. The study reveals that TCs with shorter lifetime are observed during El Niño and −ve IOD years, while TCs with longer lifetime are observed during La Niña, neutral ENSO and +ve IOD years. The decade with maximum TC formation is observed as 1921–1930, and the impacts of ENSO and IOD on decadal variability are distinctly observed.

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Acknowledgments

The encouragement and facilities provided by Kalinga Institute of Industrial Technology (KIIT) are gratefully acknowledged. The India Meteorological Department (IMD) provided cyclone e-Atlas.

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Authors and Affiliations

  1. Department of Mathematics, KIIT Polytechnic, Bhubaneswar, 751024, Odisha, India

    Biranchi Kumar Mahala

  2. Department of Mathematics, Utkal University, Vani Vihar, Bhubaneswar, 751004, Odisha, India

    Birendra Kumar Nayak

  3. Department of Marine Sciences, Berhampur University, Berhampur, 760007, Odisha, India

    Pratap Kumar Mohanty

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Correspondence to Biranchi Kumar Mahala.

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Mahala, B.K., Nayak, B.K. & Mohanty, P.K. Impacts of ENSO and IOD on tropical cyclone activity in the Bay of Bengal. Nat Hazards 75, 1105–1125 (2015). https://doi.org/10.1007/s11069-014-1360-8

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