【摘要】 利用瓦里关和上甸子大气本底站观测的月平均CO2浓度数据对GOSAT卫星反演的CO2浓度数据进行验证,结果表明GOSAT产品与台站观测数据有较好的一致性.利用2009年6月—2011年5月GOSAT反演的CO2浓度数据,分析了江苏地区CO2浓度的时空变化特征,结果表明:1)975 h Pa高度层CO2浓度高于850 h Pa高度层,CO2浓度的水平变化要小于垂直变化;2)在季节变化上,CO2浓度冬季最高,夏季最低,这可能与植被光合作用的强弱变化有关;比较前后两年的CO2浓度数据,夏季和秋季的增速较快,冬季和春季的增速较慢;3)在日变化上,发现徐州和南京站02时CO2浓度最高,14时CO2浓度最低,这可能也与植被光合作用的强弱有关.更多还原

【Abstract】 CO2 concentrationsretrieved by Greenhouse gases Observing SATellite( GOSAT) are used to study the spatial and temporal distribution of CO2 in Jiangsu province. The good agreement between the GOSAT data and ground-based measurements in Waliguan and Shangdianzi stations,which is shown in comparative analysis,validates the GOSAT data for CO2 concentrationsretrieval. The spatial-temporal characteristics of CO2 concentration by GOSAT data are listed and analyzed for Jiangsu province during June 2009 to May 2011. The volume fraction of CO2 are at the range of 398 × 10- 6-400 × 10- 6and 393 × 10- 6-394 × 10- 6at 975 h Pa and 850 h Pa,respectively. The volume fraction of CO2 changes less in horizontal than in vertical direction. As for seasonal distribution,the maximum and minimum CO2 concentrations are found in winter and summer,respectively,which can be related to photosynthesis variation in different seasons. As shown by the two years’ data,the volume fraction of CO2 increases by 3 ×10- 6-5 × 10- 6in summer and autumn,and 2 × 10- 6-4 × 10- 6in winter and spring. The diurnal variation of CO2 concentrationshows peak at 02: 00 and troughat 14: 00 in Nanjing and Xuzhou station,which may be attributed to vegetation’s photosynthesis variation at diurnal level.更多还原