Is the extreme temperature trend changed in last two decades compared to last seven decades? Case study from Eastern India

Changes in global temperature have adverse influences on the environment, crop production, and public health. Temperature extreme investigation is necessary for those areas whose cropland and work cultures rely on effective climatic conditions. Therefore, identifying trends in climatic scenarios is important in determining the pattern of extreme temperatures. The previously mentioned trend analysis was based on a complete period that did not investigate the recent variability in temperature. We scrutinized a different decadal zone using the innovative trend analysis method (ITAM). We selected the annual and seasonal extreme temperature variations for 70 years (1951–2020) at 11 grid points in the Kangsabati–Silabati–Keliaghai–Dwarkeswar basins of West Bengal. The outcomes from two different time zones, 1951–2020 and 2001–2020, show some surprising results. For 1951–2020, Tmax shows negative sloping patterns in winter and summer, whereas for 2001–2020, it shows the opposite pattern: year-round, winter and summer with excessive magnitudes. Similarly, for Tmin, all the seasons from 1951 to 2020 show positive trends, but in recent decades (2001–2020), except the monsoon season, other seasons show negative trends. The normalized difference in vegetation and water indices also supports the results of trends. From the results obtained through the use of ITAM, we recognize that the results of the recent trends are more sensitive and of a higher magnitude of slope in nature than in the historical decade. This study may serve as scientific support for detecting and strategically minimizing the effects of climate change on water resources to reduce the risk of adverse weather soon.