内蒙古地区二氧化碳柱浓度时空分布特征分析
Analysis of Spatiotemporal Distribution Characteristics of Carbon Dioxide Column Concentration in Inner Mongolia Region

为厘清内蒙古地区XCO₂时空分布及其源汇特征，本研究基于GOSAT卫星的二氧化碳柱浓度(XCO₂)官方L2数据产品，运用反距离权重(IDW)方法对内蒙古地区进行XCO₂空间插值，研究2019年内蒙古自治区以及各盟市XCO₂空间分布和季节变化特征，对影响XCO₂分布的驱动因素进行分析。结果表明：基于IDW方法插值结果与观测结果误差大部分处于±1 ppm之间，模拟结果和观测结果有较好的一致性；在内蒙古XCO₂时空分布特征方面，浓度高值出现在内蒙古中部、西部以及东北部地区，而北部接壤蒙古国的地区XCO₂浓度相对较低；内蒙古自治区XCO₂年均值为407 ppm，春、夏、秋、冬季XCO₂均值统计分别为 409.32 ppm、403.6 ppm、405.57 ppm、408.44 ppm，东部地区相比西部地区季节差异更明显，呈现出冬春季高、夏秋季低的分布特征；按盟市统计结果显示，呼、包、鄂等经济水平相对较高地区XCO₂浓度较高，锡林郭勒盟、巴彦淖尔市等人口分布较少地区XCO₂浓度相对较低。
In order to clarify the spatial and temporal distribution of XCO₂ and its source and sink characteristics in Inner Mongolia, based on the official L2 product of carbon dioxide column concentration (XCO₂) of GOSAT satellite. This study used the inverse distance weight (IDW) method to interpolate XCO₂ in Inner Mongolia, qualified the spatial distribution and seasonal variation characteristics of XCO₂ in Inner Mongolia Autonomous Region and its cities in 2019, and analyzed the driving factors affecting the distribution of XCO₂. The results showed that most of the errors between the interpolation results based on the IDW method and the observed values are around ±1 ppm, and the simulation results are in good agreement with the observed results. In terms of the spatial and temporal distribution characteristics of XCO₂, the high concentration appeared in the central, western and northeastern regions of Inner Mongolia, while the XCO₂ concentration in the northern region bordering Mongolia was relatively low. The annual average value of XCO₂ in Inner Mongolia Autonomous Region is 407 ppm. The average values of XCO₂ in spring, summer, autumn and winter are 409.32 ppm, 403.6 ppm, 405.57 ppm and 408.44 ppm, respectively. The seasonal difference in the eastern region is more obvious than that in the western region, showing the distribution characteristics of high in winter and spring and low in summer and autumn. According to the statistical results of the league city, the XCO₂ in the relatively high economic level areas such as Hohhot, Baotou and Erdos is higher, and the XCO₂ in the sparsely populated areas such as Xilin Gol League and Bayan Nur City is relatively low.