Spatial and statistical characteristics of heat waves impacting India

N. Naveena; G. Ch. Satyanarayana; A. Dharma Raju; K Sivasankara Rao; N. Umakanth; N. Naveena; G. Ch. Satyanarayana; A. Dharma Raju; K Sivasankara Rao; N. Umakanth

doi:10.3934/environsci.2021009

AIMS Environmental Science

2021, Volume 8, Issue 2: 117-134. doi: 10.3934/environsci.2021009

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Research article Special Issues

Spatial and statistical characteristics of heat waves impacting India

1.
Center for Atmospheric Science, Koneru Lakshmaiah Education Foundation, Andhra Pradesh, India
2.
India Meteorological Department, Ministry of Earth Sciences, Hyderabad, Govt. of. India
3.
Andhra Pradesh State Development Planning Society, Govt. of AP, India

Received: 05 December 2020 Accepted: 08 March 2021 Published: 16 March 2021

The climate of a place has a decisive role in human adaptations. Man's health, adaptability, behavioural patterns, food, shelter, and clothing are mainly influenced by the temperatures of the area. Hence, a study is undertaken to analyse the spatial distribution, frequency, and trend in the heat waves over the country. The statistical characteristics of heat waves over India are addressed in this study. Gridded daily temperature data sets for the period 1951–2019 were used to compute the arithmetic mean (AM), standard deviation (SD), coefficient of variation (CV), and trends of monthly maximum temperature. The number of heat wave days were identified using the criteria given by India Meteorological Department (IMD) i.e., a heat wave is recognized when the daily normal maximum temperature of a station is less than or equal to (greater than) 40 ℃ than it will be considered as a heat wave if the daily maximum temperature exceeds the daily normal maximum temperature by 5 ℃ (4 ℃). The analysis was confined to the two summer months of April and May only. The spatial distribution of the AM shows higher values during May, and the core hot region with temperatures exceeding 40 ℃ lies over central India extending towards the northwest. The SD distribution shows higher values over the northeast of central India decreasing towards the southwest. The CV distribution shows higher values over the north decreasing toward the south. Higher numbers of heat waves are observed during May and the number is higher over Andhra Pradesh and south Telangana regions of southeast India. This study concludes that a moderate hot region experiences a higher number of heat wave days over India.
- heat waves,
- maximum temperatures,
- climate,
- statistical metrics,
- trends
Citation: N. Naveena, G. Ch. Satyanarayana, A. Dharma Raju, K Sivasankara Rao, N. Umakanth. Spatial and statistical characteristics of heat waves impacting India[J]. AIMS Environmental Science, 2021, 8(2): 117-134. doi: 10.3934/environsci.2021009

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Abstract

The climate of a place has a decisive role in human adaptations. Man's health, adaptability, behavioural patterns, food, shelter, and clothing are mainly influenced by the temperatures of the area. Hence, a study is undertaken to analyse the spatial distribution, frequency, and trend in the heat waves over the country. The statistical characteristics of heat waves over India are addressed in this study. Gridded daily temperature data sets for the period 1951–2019 were used to compute the arithmetic mean (AM), standard deviation (SD), coefficient of variation (CV), and trends of monthly maximum temperature. The number of heat wave days were identified using the criteria given by India Meteorological Department (IMD) i.e., a heat wave is recognized when the daily normal maximum temperature of a station is less than or equal to (greater than) 40 ℃ than it will be considered as a heat wave if the daily maximum temperature exceeds the daily normal maximum temperature by 5 ℃ (4 ℃). The analysis was confined to the two summer months of April and May only. The spatial distribution of the AM shows higher values during May, and the core hot region with temperatures exceeding 40 ℃ lies over central India extending towards the northwest. The SD distribution shows higher values over the northeast of central India decreasing towards the southwest. The CV distribution shows higher values over the north decreasing toward the south. Higher numbers of heat waves are observed during May and the number is higher over Andhra Pradesh and south Telangana regions of southeast India. This study concludes that a moderate hot region experiences a higher number of heat wave days over India.

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