Abstract
Land surface temperature (LST) is a crucial parameter for understanding the Earth’s surface energy balance, which provides insights into climate dynamics and local environmental conditions. Thus, the present study aims to evaluate the spatial and elevation-wise trends in the daytime, nighttime, and mean LST across the Indus River Basin (IRB) using MODIS 8-day product for the period between 2002 and 2022. The elevation, cloud cover, and land cover type data are used for explaining the emerging LST trends. The Theil slope estimator and Mann-Kendall significance test were used for estimating the seasonal and annual LST trends. The findings show warming in mean daytime (0.020–0.024°C/yr) (except winter and post-monsoon), nighttime (0.013–0.049°C/yr), and mean (0.001–0.042°C/yr) LST in all the seasons (highest in monsoon). The annual mean nighttime LST (0.025°C/yr) is rising significantly faster than the mean daytime LST (0.0016°C/yr), showing the presence of a “nighttime warming effect”, which possibly increases human discomfort, particularly during the warm pre-monsoon and humid monsoon season. Elevation-dependent warming (EDW) is predominant in mean daytime LST in two elevation zones, namely (i) 0–3 km and (ii) above 4 km, in all seasons, except in post-monsoon. In contrast, EDW in mean nighttime LST is observed up to 3 km and above 6 km in the basin in all the seasons, excluding post-monsoon. The warming trend in LST may be attributed to rising atmospheric moisture, cloud cover, declining snow cover, and changes in land cover to non-vegetated land. However, further investigations will involve exploring the underlying factors contributing to the observed anomalies in nighttime LST, considering variables such as regional energy balance and atmospheric stability. This research contributes to an understanding of the thermal dynamics in the mountain basin, aiding in climate studies, land management, and the development of effective adaptation strategies in the IRB.
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Data Availability: The raw datasets used in the current study are available on the Earthdata website (https://www.earthdata.nasa.gov).
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Acknowledgements
The authors are thankful to the MODIS science team for providing data in the public domain. The third author is thankful to the Banaras Hindu University, Varanasi, Uttar Pradesh (India), for providing a seed grant (Letter No. R/Dev/D/IoE/Equipment/SeedGrant-II/2022-23/52078) under the Institute of Eminence (IoE).
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All authors contributed to the study’s conception, design, and analysis. Material preparation and data collection were performed by Suraj MAL and Kavya AGRAWAL. Data analysis, figures, and manuscript preparation and revision were done by all the authors.
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Mal, S., Agrawal, K., Rani, S. et al. Evaluating spatial and elevation-wise daytime/nighttime LST trends across the Indus River Basin. J. Mt. Sci. 20, 3154–3172 (2023). https://doi.org/10.1007/s11629-023-8157-8
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DOI: https://doi.org/10.1007/s11629-023-8157-8