基于卫星遥感的广东地区对流层二氧化碳时空变化特征

Spatial and temporal distributions of tropospheric CO_2 concentrations over Guangdong province based on satellite observations

利用瓦里关全球本底站和番禺气象局地面观测的 CO2浓度资料对 SCIAMACHY 反演得到的对流层 CO2产品进行验证.结果显示：SCIAMACHY产品能较好地反映对流层CO2的分布状况,在珠三角地区反演和观测的残差为1.29×10^-6,相关系数为0.69,可用于分析区域对流层CO2的时空分布特征.利用2003~2009年SCIAMACHY观测资料分析研究显示：广东地区对流层CO2柱浓度最高值出现在春季,最低值出现在夏季,浓度年均值和年增长率分别为384.84×^10-6和1.53×10^^-6/a,大于全球和我国同期的观测结果；粤东、粤西、粤北和珠三角地区的浓度均在春、冬季显著高于夏季、秋季,相同季节内各区域之间的差异不显著；粤西地区CO2柱浓度的年增长率最高,为1.82×10^-6/a,珠三角和粤东地区的年增长率相当,分别为1.65,1.64×^10^-6/a,粤北地区的年增长率最低,为1.61×10^-6/a.

SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY （SCIAMACHY） retrievals of tropospheric CO2 concentrations were validated using ground-based measurements collected at the Waliguan （WLG） site （representing background conditions） and at the Panyu meteorological site （PYQXJ） in Guangzhou province from January 2003 to December 2009. Residuals and correlation coefficients from a linear regression of SCIAMACHY retrievals as a function of ground measurements were 1.33＆#215;10-6 and 0.72, respectively, at the WLG site 1.29＆#215;10-6 and 0.69, respectively, at the PYQXJ site. In Guangdong region, the satellite-retrieved annual mean CO2 concentration （384.84＆#215;10-6） and annual growth rate （1.53＆#215;10-6/a） were greater than those measured from the ground. The maximum and minimum CO2 concentrations across Guangdong province were seen in spring and summer, and all the CO2 concentrations in eastern, western, northern Guangdong and into the Pearl River Delta region （PRD） were higher in spring and winter, but lower in summer and autumn. The annual mean growth rate of CO2 was highest in western Guangdong （1.82＆#215;10-6/a）, moderate over the PRD and in eastern Guangdong （1.65＆#215;10-6/a and 1.64＆#215;10-6/a, respectively）, and lowest in northern Guangdong （1.61＆#215;10-6/a）.