Analysis of long-term seasonal and annual temperature trends in North Bengal, India

• Published in: Spatial information research (Online) Vol. 27; no. 4; pp. 475 - 496
• Main Authors: Datta, Pritha, Das, Soumik
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01.08.2019; 대한공간정보학회
• Subjects: Database Management; Earth and Environmental Science; Geographical Information Systems/Cartography; Geography; Remote Sensing/Photogrammetry; 공학일반; Climate change; Sequential Mann–Kendall test; Mann–Kendall test; North Bengal; Temperature trend; Theil-Sen’s slope estimator
• ISSN: 2366-3286; 2366-3294
• DOI: 10.1007/s41324-019-00250-8

In the recent past, scientific modeling of climatic elements, in particular, temperature data has attained considerable importance as it affects many aspects of the environment and also indicates a clear sign of climate change. The temperature warming is mainly associated with the increasing concentration of greenhouse gases triggered by the land use and land cover changes. In the last century, exploitation of forest resource, population influx, and expansion of agricultural land has changed the natural landscape of North Bengal to a great extent. Thus the present study intends to find out long-term changes in maximum and minimum temperature for six northern districts of the state of West Bengal, popularly known as North Bengal. The non-parametric Mann–Kendall test and Theil-Sen’s slope estimator reveals the presence of warming trends in both maximum and minimum temperature. Annual temperature is rising 0.006 °C per year and 0.007 °C per year at most of the districts for the maximum and minimum temperature respectively. However, the seasonal analysis of trend exposes that post-monsoon and winter temperature rise are predominantly contributing to the upward annual trend. The highest increasing trend in maximum and minimum temperature is observed at Malda (0.013 °C per year) in the post-monsoon and winter season respectively. Except the post-monsoon season, the minimum temperature is rising rapidly than maximum temperature across the region. Additionally, Sequential Mann–Kendall test exhibits the periodic fluctuation of trends, which are more prominent in pre-monsoon and monsoon season.