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Increasing pre-monsoon rain days over four stations of Kerala, India

  • Research Article - Atmospheric & Space Sciences
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Abstract

The climate of India varies greatly by region, as seen by wind patterns, temperature and rainfall, seasonal rhythms and the degree of wetness or dryness. During the several seasons, the weather conditions change. Changes in meteorological factors (temperature, pressure, wind direction and velocity, humidity and precipitation, etc.) cause these changes. The pre-monsoon season (PRMS) comprises of March, April and May months. The precipitation patterns observed in PRMS are crucial because it affects a variety of crop-related operations across the country. The lifting index (LI), K index (KI), total totals index (TTI), humidity index (HI), improved k index, improved total totals index, total precipitable water (TPW) and convective available potential energy (CAPE) are studied at four locations in Kerala during PRMS. These variables were examined on rain day (RD)’s and no rain day (NRD)’s. The four stations we chose for our investigation were Thiruvananthapuram, Kochi, Alappuzha and Kannur. The GPM IMERG (Integrated Multi-satellite Retrievals for Global Precipitation Measurement) daily rainfall datasets have been utilized for this analysis. Fifth-generation ECMWF atmospheric reanalysis (ERA5) daily data for the PRMS of 2021 were used to measure all rainfall-related variables. During PRMS, all metrics clearly distinguished the RD and NRD. The rise in relative humidity and observations of dew point depression indicates that there is enough moisture for convective rain. In May, there were more negative VV values than in April.

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Authors and Affiliations

  1. Department of ECE, Dhanekula Institute of Engineering and Technology, Vijayawada, 521139, India

    Nandivada Umakanth & Rajesh Gogineni

  2. Department of ECE, Koneru Lakshmaiah Education Foundation, Vaddeswaram, 522502, India

    S. S. S. Kalyan

  3. Center for Atmospheric Science, Koneru Lakshmaiah Education Foundation, Vaddeswaram, 522502, India

    Gubbala China Satyanarayana

  4. Department of H&S (Physics), Teegala Krishna Reddy Engineering College, Meerpet, Hyderabad, 500097, India

    Ayachithula Nagarjuna

  5. Department of Physics, Krishna University, Machilipatnam, 521001, India

    Ramisetti Naveen

  6. Department of Physics, Government College (A), Rajamahendravaram, 533105, India

    Kokkerapati Ramachandra Rao

  7. Department of Physics, Andhra Loyola College, Vijayawada, 520008, India

    Myla Chimpiri Rao

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  1. Nandivada Umakanth
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  2. S. S. S. Kalyan
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  3. Gubbala China Satyanarayana
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  4. Rajesh Gogineni
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  5. Ayachithula Nagarjuna
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  7. Kokkerapati Ramachandra Rao
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  8. Myla Chimpiri Rao
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Correspondence to Myla Chimpiri Rao.

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Edited by Dr. Mohammad Valipour (ASSOCIATE EDITOR) / Dr. Michael Nones (CO-EDITOR-IN-CHIEF).

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Umakanth, N., Kalyan, S.S.S., Satyanarayana, G.C. et al. Increasing pre-monsoon rain days over four stations of Kerala, India. Acta Geophys. 70, 963–978 (2022). https://doi.org/10.1007/s11600-022-00742-6

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  • DOI: https://doi.org/10.1007/s11600-022-00742-6

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