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Evaluation of daily average temperature trends in Kerala, India, using MERRA-2 reanalysis data: a climate change perspective

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Abstract

Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2) data for a period of 40 years (1980–2019) was used to detect the trend characteristics of daily average temperature in the state of Kerala, India. Data extracted from a total of fifty locations in the state were statistically processed using Mann–Kendall (MK) and Spearman’s Rho (SR) tests to detect the trend, Pettitt test to identify the single change point, and Theil-Sen’s method for the calculation of the rate of change. The MERRA-2 product is validated for the study region according to statistical indicators. The daily average temperature in the state during the period of study varies between 16.56 and 32.64 °C. The spatial pattern of daily average maximum temperature shows higher temperature domains in the central and southern parts of the state. Trend characteristics of daily average temperature assessed through MK and SR tests show a significant increasing trend in all stations, with maximum values in stations located in the northern part of the state. Change point detected through the Pettitt test divided the sampling stations into three groups based on the change in daily average temperature characteristics in the years 2002 (north zone), 2009 (south zone), and 2012 (central zone), indicating nonunique spatial variability in temperature characteristics in the state. The rate of change in the daily average temperature assessed indicates an increase at the rate of an average of 0.013 °C.year−1. During the whole study period, the daily average temperature showed an overall increase of 0.54 °C, and for the 100-year futuristic prediction, the daily average temperature in the state shows an average increase of 1.35 °C. Among the stations, a higher rate of increase in daily average temperature is shown by stations located in the eastern part of the Pathanamthitta, Idukki, and Kollam districts. Though the rise in daily average temperature is not much higher, its spatial characteristics require more attention because, in recent times, the study area has faced repeated, severe, and long drought conditions along with sunburn incidents. As an agrarian state, a change in the temperature domain will adversely affect the overall agricultural production and will evoke not only a food crisis but also economic as well as water resources issues. The result obtained can be used as holistic basic information for understanding the impending effect of climate change in the state to frame better mitigation as well as management strategies.

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Data availability

All the datasets used in this research is collected from open source. Temperature data was collected from NASA’s Global Modeling and Assimilation Office (GMAO)https://gmao.gsfc.nasa.gov/reanalysis/MERRA-2/ and web service of Solar Radiation Data (SoDa).

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Acknowledgements

The third author thanks CNPq for its Level 2 Research Productivity Scholarship (no. 309681/2019-7). Authors are thankful to the anonymous reviewers and Editor-in-Chief Dr. Philippe Garrigues for their critical review and constructive comments and suggestions, which improved the quality of the manuscript.

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All authors contributed to the study’s conception and design. Material preparation and data collection and analysis were performed by Ninu Krishnan Modon Valappil, Vijith Hamza, and José Francisco de Oliveira Júnior. The first draft of the manuscript was written by Ninu Krishnan Modon Valappil, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Vijith Hamza.

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Valappil, N.K.M., Hamza, V. & de Oliveira Júnior, J.F. Evaluation of daily average temperature trends in Kerala, India, using MERRA-2 reanalysis data: a climate change perspective. Environ Sci Pollut Res 30, 26663–26686 (2023). https://doi.org/10.1007/s11356-022-23895-9

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