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Organization of vertical shear of wind and daily variability of monsoon rainfall

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Abstract

Very little is known about the mechanisms that govern the day to day variability of the Indian summer monsoon (ISM) rainfall; in the current dominant view, the daily rainfall is essentially a result of chaotic dynamics. Most studies in the past have thus considered monsoon in terms of its seasonal (June–September) or monthly rainfall. We show here that the daily rainfall in June is associated with vertical shear of horizontal winds at specific scales. While vertical shear had been used in the past to investigate interannual variability of seasonal rainfall, rarely any effort has been made to examine daily rainfall. Our work shows that, at least during June, the daily rainfall variability of ISM rainfall is associated with a large scale dynamical coherence in the sense that the vertical shear averaged over large spatial extents are significantly correlated with area-averaged daily rainfall. An important finding from our work is the existence of a clearly delineated monsoon shear domain (MSD) with strong coherence between area-averaged shear and area-averaged daily rainfall in June; this association of daily rainfall is not significant with shear over only MSD. Another important feature is that the association between daily rainfall and vertical shear is present only during the month of June. Thus while ISM (June–September) is a single seasonal system, it is important to consider the dynamics and variation of June independently of the seasonal ISM rainfall. The association between large-scale organization of circulation and daily rainfall is suggested as a basis for attempting prediction of daily rainfall by ensuring accurate simulation of wind shear.

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Acknowledgments

This work is supported by CSIR, India and SERB, DST, Govt. of India (Grant No. SB/S4/AS-120/2013).

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Authors and Affiliations

  1. CSIR Centre for Mathematical Modelling and Computer Simulation, Wind tunnel Road, Bangalore, 37, India

    K. C. Gouda

  2. CSIR-National Institute of Science, Technology and Development Studies, New Delhi, India

    P. Goswami

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  1. K. C. Gouda
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  2. P. Goswami
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Correspondence to P. Goswami.

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Responsible Editor: J. T. Fasullo.

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Gouda, K.C., Goswami, P. Organization of vertical shear of wind and daily variability of monsoon rainfall. Meteorol Atmos Phys 128, 565–577 (2016). https://doi.org/10.1007/s00703-016-0437-1

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