我国中部地区大气CO2柱浓度时空分布

基于日本GOSAT及美国AIRS反演数据产品，对我国中部六省大气CO₂时空分布特征进行研究，结果表明：由GOSAT反演的中部地区2010~2013年大气CO₂年均柱浓度由389.36×10^-6增长到396.52×10^-6，年均绝对增长率达2.39×10^-6/a，呈现出冬春季高值、夏秋季低值的季节变化特征，其柱浓度年均值及去长期趋势后的月均值均略低于长三角地区，高于京津冀和东三省地区；其CO₂柱浓度高值区集中在湖南、江西及周边一带，年均绝对增长率为2.01×10^-6，其柱浓度年均值及去长期趋势后的月均值与长三角地区相当，略低于京津冀和东三省地区，由于受地面源汇影响较小，其与GOSAT反演结果相反，可能是由于AIRS反映了对流层中层大气状况，而GOSAT则更多地反映了近地面层大气CO₂变化.

Spatial and temporal distribution characteristics of atmospheric CO2 in central China

Based on retrieved CO₂ products of GOSAT and AIRS, the spatial and temporal distribution characteristics of CO₂ in central areas of China were analyzed. The annual CO₂ retrieved from GOSAT range from 389.36×10^-6 in 2010 to 396.52×10^-6 in 2013, with a growth rate of 2.39×10^-6per year. The annual mean in central areas of China were slightly lower than Yangze River Delta (YZD), but higher than Jing-Jin-Ji area (JJJ) and Northeastern China region (NCR). The CO₂ in Hunan and Jiangxi province was with the highest values, and it was with the lowest values over north areas of Shanxi province. The annual CO₂ retrieved from AIRS varied from 390.48×10^-6 in 2010 to 396.50×10^-6 in 2013, with a growth rate of 2.01×10^-6 per year, and the annual mean CO₂ were similar with YZD, while slightly lower than JJJ and NCR. Due to small impact from ground sources and sinks, the CO₂ seasonal amplitude retrieved from AIRS was smaller than that of GOSAT. On the contrary, high-value regions of CO₂ from AIRS mainly distributed over Henan and Shanxi, and the low-value regions presented in Hunan and Jiangxi, which was likely due to that GOSAT and AIRS products represented CO₂ variations over different height.