Time Series Change Analysis of Urban Heat Mitigation Capacity Using the InVEST Urban Cooling Model : Focused on Jeju Special Self-Governing Province

<p>Urban heat island is a phenomenon in which the temperature of urbanized areas is higher than that of other surrounding areas. Urban heat islands are caused by artificialization of surface cover, changes in urban shape, and increase in artificial arrangement, while Green space reduce the heat by lowering surface temperature due to reflection and evaporation of solar radiation.</p> <p>This study targeted Jeju Island, which had the most heat waves and tropical nights in South Korea ,and evaluate the heat mitigation ability under the biological mechanism between the physical environment that generates urban heat and green space that reduce urban heat. In addition, the change in heat mitigation according to the change in the type of land cover over 30 years (late 1980s to late 2010s) was analyzed.</p> <p>In this study, the InVEST urban cooling model was used to evaluate the heat mitigation ability in the city. The InVEST urban cooling model calculates an index of heat mitigation based on shade, evapotranspiration, and albedo, as well as distance from cooling islands.</p> <p>As a result, From the late 1980s to the late 1990s, the area of Grade1 decreased by 63.79㎢ , while the area of Grade2(17.68㎢), Grade3(32.92㎢) , Grade4(8.10㎢), Grade 5(5.01㎢) are increased. And from the late 1990s to the late 2000s, the area of Grade1(37.51㎢), Grade3(0.88㎢), Grade4(1.35㎢) are decreased, while the area of Grade2(31.37㎢), Grade5(8.38㎢) are increased. Further more the late 2000s to the late 2010s, the area of Grade1 rapidly decreased by 501.57㎢, while the area of Grade2(368.59㎢), Grade3(102.46㎢) , Grade4(22.16㎢), Grade5(8.36㎢) are increased. Under the time series analysis, areas that are constantly vulnerable or show rapid grade changes can be viewed as vulnerable areas. It is necessary to establish the urban heat reduction policy, such as land cover changes and expanding green areas, in consideration of environmental characteristics, focusing on these vulnerable areas.</p> <div data-hjsonver="1.0" data-jsonlen="10140"> </div> <p>※ This work was supported by Korea Environment Industry &Technology Institute (KEITI) through "Climate Change R&D Project for New Climate Regime.", funded by Korea Ministry of Environment (MOE) (No. 202201344001)</p> <div data-hjsonver="1.0" data-jsonlen="7531"> </div>