ScholarWorks@중앙대학교

초록

Effective management of the Urban Heat Island (UHI) effect and heatwaves is essential for urban sustainability and quality of life. However, prior studies on summer land surface temperature (LST) have primarily focused on specific times, such as noon. Climate change and UHI affect noontime as well as maximum and minimum LSTs, influencing the diurnal temperature range (DTR). This study aims to deepen our understanding of DTR’s spatial distribution and key drivers for a heat-resilient urban design. High-resolution LST imagery from NASA's ECOSTRESS mission (2019–2021) over Seoul, South Korea, was used to construct a diurnal time-series dataset and quantify DTR. Unlike atmospheric temperatures, LST is highly sensitive to the urban environment and may exhibit nonlinear relationships with environmental factors. Thus, the study employs nonlinear modeling to examine DTR’s complex associations with urban factors, exploring threshold and saturation effects. Seoul was first divided into Local Climate Zones, followed by an analysis of DTR within each type. A Generalized Additive Model was then applied to explore nonlinear relationships between LST variability and explanatory variables. Results show that increased building coverage exacerbates temperature variability, while higher floor area ratios and building heights reduce it until thresholds reverse the trend. Normalized Difference Vegetation Index exhibited a threshold effect, reducing temperature variability only when it exceeded 0.1, while water bodies had an exponential cooling effect. These findings underscore the complex interactions between urban forms and LST, highlighting the need to integrate natural elements into urban planning for climate resilience.

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