Simulation of Spatial Distribution of Carbon Emissions in Shenyang City Based on Remote Sensing and GIS
基于RS和GIS的沈阳碳排放空间分布模拟

Accurately simulating carbon emission level, exploring carbon emission mechanisms, and establishing relevant goals for carbon emission reductions in cities provide basic outlines to develop low carbon economy and constitute low carbon development programming in the future. This study used the thermal infrared band information with spatial resolution of 120 m from the Landsat Thematic Mapper (TM). Four scenes of Landsat TM images corresponding to spring, summer, autumn, and winter acquired on Apr 22, Jul 27, Oct 15, and Jan 16 in 2010, respectively, were utilized. These images covered the whole Shenyang City District, with the path/row number being 119/31. The classification regression tree (CART) algorithm was adopted to classify land cover type over there. The TM 6 single window algorithm was used to derive land surface temperature. The support vector machine (SVM) algorithm was adopted to simulate spatial distribution of carbon emission in the city based on the spatial distribution of thermal information. Then based on GIS and the improved Gauss carbon emission diffusing pattern modified model, the simulated carbon emission values and spatial location in the study area were modified, with the spatial distribution of carbon emission features being analyzed, and the relationship between various land cover types and relevant carbon emission distributions being examined. Results show that the largest area in Shenyang City District in 2010 was cropland (59.18%), the second largest cover area was low density construction (19.49%), and the third was forestland (8.08%). The area of high density construction covered about 7.38%, distributed mainly in the dense population areas around the city center. The cover ratio of transportation regions was the lowest (0.81%), including primarily roads and squares. The average carbon emission thickness value was between 423.25 and 454.52 ppm in 2010. Carbon emission distributions suggest that its value was basically high within the city, and the carbon emission value in the southwest was higher than the northeast. The carbon emission value was highest in winter, followed by autumn and spring, and lowest in summer. Results of different land cover types and corresponding carbon emission distributions in Shenyang City District show that the carbon emission was highest (454.01ppm) for transportation land. The second highest was the high density construction area and the concentration reached 452.32 ppm. The third one was low density construction area with the concentration of 448.17 ppm.