TY  - JOUR
AU  - Gupta, Rupesh Kumar
AU  - Tiwari, Yash Kumar
AU  - Gupta, Arpit
AU  - Yadav, Grinedge
AU  - Gupta, Swati
PY  - 2026
DA  - 2026/08/06
TI  - Seasonal Urban Heat Persistence and Nighttime Radiance Intensification in Jaipur, India: Spatiotemporal Analysis
JO  - Advances in Environmental and Engineering Research
SP  - 024
VL  - 07
IS  - 03
AB  - Urban thermal environments reflect the relationship between land surface temperature (LST) and anthropogenic activity. The present study analyses seasonal land surface temperature, the Urban Thermal Field Variance Index (UTFVI), and night-time radiance in Jaipur, India from 2014 to 2025 using Landsat 8 Collection 2 and VIIRS Day/Night Band datasets. The Summer (April-June) and winter (November-December) median composites were generated for continuous analysis and for classified assessment. In the study, five LST and UTFVI classes were used to examine spatial expansion with regression and correlation analyses. The mean summer LST ranged from 41.23°C to 50.62°C while winter LST varied between 19.01°C and 30.81°C. The regression results indicate interannual variability with no consistent linear warming trend over the study period. In contrast, the VIIRS radiance increased steadily from 19.06 to 26.57 nW·cm-2·sr-1. This result confirms sustained urban intensification. The Pearson correlation between VIIRS and summer LST was weakly negative during 2014-2018 (r = -0.286) and weaker during 2019-2025, while winter associations remained negligible. These findings indicate that increasing nighttime radiance does not directly correspond to proportional seasonal surface warming. The classified analysis shows a persistent dominance of high-summer LST classes, with extreme heat (Class 5, >45°C) accounting for more than 75% of the area in 2014 and 2019. The development of winter heat was episodic, with 2016 representing a pronounced anomaly. The UTFVI results of the study reveal sustained ecological stress with strong stress categories covering more than one-third of the urban area in most seasons. Maximum UTFVI values remained concentrated in dense built-up zones. The results of the current study demonstrate persistent summer heat, continuous radiance growth, and concentrated ecological stress in Jaipur. In the study period, the divergence between radiance expansion and LST response highlights the role of land surface composition and seasonal climate in moderating urban thermal behaviour.
SN  - 2766-6190
UR  - https://doi.org/10.21926/aeer.2603024
DO  - 10.21926/aeer.2603024
ID  - Gupta2026
ER  -