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Occurrence of More Heat Waves Over the Central East Coast of India in the Recent Warming Era


The increased temperature and humidity in the atmosphere under global warming is the primary cause of the upsurge of heat waves in the tropical belt. The central east coast of India (CECI; Odisha, Andhra Pradesh, and Telangana) is one of the most heavily affected areas in terms of casualties due to heat waves during pre-monsoon (March–May; MAM). Thus, there is a need to analyze the characteristics of pre-monsoon weekly maximum temperature (Tmax) and associated heat waves over the CECI. In the present study, characteristics of weekly Tmax from 23 March to 31 May over the CECI associated with heat waves have been analyzed using the India Meteorological Department gridded (1º × 1º) analysis data set of daily maximum temperature for the period 1980–2015. The recent changes in the weekly Tmax and frequency of various heat-wave spells (1-, 2-, 3-, and 5-day) were also evaluated. The results suggest that the climatological weekly Tmax along the coastal region is less than that in the interior parts for all 10 weeks, and the inter-annual variability and coefficient of variation exhibit similar patterns. The continuous increase in Tmax and its variability is observed as the season progresses, leading to increased intensity and frequency of heat waves in most parts of the CECI. In the recent period, a notable increase in the weekly Tmax and its variability has been observed over most parts of the CECI that has resulted in more heat waves. This study is very beneficial for determining the effects on various sectors for the planning of adaptation methodologies through appropriate strategies for a tolerable future over the CECI in the context of global warming.

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This research is an outcome of the project entitled “Development and Application of Extended Range Forecast System for Climate Risk Management in Agriculture Phase–II” sponsored by the Department of Agriculture, Cooperation, and Farmers Welfare (DAC&FW), Government of India. The authors gratefully acknowledge the India Meteorological Department (IMD) for providing the gridded surface maximum temperature analysis data set. The authors are thankful to Mr. M.C. Sannan, School of Earth, Ocean and Climate Sciences, Indian Institute of Technology (IIT) Bhubaneswar for providing his support for this study. We are very much thankful to the anonymous reviewers for providing valuable suggestions and comments which helped to improve the quality of the manuscript.

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Correspondence to M. M. Nageswararao.

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Nageswararao, M.M., Sinha, P., Mohanty, U.C. et al. Occurrence of More Heat Waves Over the Central East Coast of India in the Recent Warming Era. Pure Appl. Geophys. 177, 1143–1155 (2020).

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  • Heat waves
  • pre-monsoon
  • maximum temperature
  • climate change
  • central east coast of India