Abstract
This paper offers a comprehensive investigation of crucial meteorological variables [rainfall (P), surface temperature (T), and relative humidity (RH)] for Maharashtra (307,690 km2 area), a dry-arid state in the western Indian subcontinent, encompassing four meteorological subdivisions: Konkan and Madhya Maharashtra (west) and Marathwada and Vidarbha (east). The central hypothesis posits that Maharashtra is rapidly becoming an emerging warming state. To examine this hypothesis, long-term hydroclimatic time series (1980–2020) data for P, T, and RH were derived from the ECMWF-ERA5 dataset and analyzed using non-parametric Mann–Kendall and Sen's Slope methods at α = 0.05 significance level. Pearson correlation coefficient (PCC) was applied for time series and scatter plot interpretation. Anomalies were identified by comparing data from 2011 to 2020 to the baseline (1981–2020). The results showed significant and positive trends in temperature (T) and rainfall (P) across Maharashtra and its subdivisions. Relative humidity (RH) had an insignificant but positive trend. The highest correlation was between RH and P, followed by T and P, with the weakest association between T and RH. Konkan had the highest RH and P values, while Vidarbha experienced the highest temperatures. Temperature anomalies ranged from 0.19 to 1.29 °C in Maharashtra, with the most significant anomaly in Marathwada (0.62–1.77 °C) and Vidarbha (0.67–1.56 °C). RH and P anomaly values decreased with rising temperatures, especially during summer, winter, and in the eastern region, potentially leading to hotter summers and less cool winters. In conclusion, the findings provide robust evidence of Maharashtra's emergence as a warming state, particularly during the recent decade (2011–2020).
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Acknowledgements
This work is partially supported by the Ministry of Earth Sciences (MoES) under the Government of India. The funding for the student (AS) was supported by Prime Minister’s Research Fellowship (PMRF/2401746/21CE91R03) under the Ministry of Education, Government of India. Technical assistance received from Leena Khadke is gratefully acknowledged.
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All authors contributed to the study's conception and design. AS collected the data and conducted the analysis, while RM and VRD guided the material preparation, data collection, and analysis. AS wrote the first draft of the manuscript, while RM and VRD commented on previous versions. All authors read and approved the final manuscript.
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Srivastava, A., Maity, R., Desai, V.R. (2024). Investigating Spatio-Temporal Trends and Anomalies in Long-Term Meteorological Variables to Determine If Maharashtra is an Emerging Warming State in India. In: Sreekeshava, K.S., Kolathayar, S., Vinod Chandra Menon, N. (eds) Civil Engineering for Multi-Hazard Risk Reduction. IACESD 2023. Lecture Notes in Civil Engineering, vol 457. Springer, Singapore. https://doi.org/10.1007/978-981-99-9610-0_25
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