China's first carbon dioxide (CO2) measurement satellite mission, TanSat, was launched in December 2016. This paper introduces the first attempt to detect anthropogenic CO2 emission signatures using CO2 observations from TanSat and NO2 measurements from the TROPOspheric Monitoring Instrument (TROPOMI) onboard the Copernicus Sentinel-5 Precursor (S5P) satellite. We focus our analysis on two selected cases in Tangshan, China and Tokyo, Japan. We found that the TanSat XCO2 measurements have the capability to capture the anthropogenic variations in the plume and have spatial patterns similar to that of the TROPOMI NO2 observations. The linear fit between TanSat XCO2 and TROPOMI NO2 indicates the CO2-to-NO2 ratio of 0.8 × 10-16 ppm (molec cm-2)-1 in Tangshan and 2.3 × 10-16 ppm (molec cm-2)-1 in Tokyo. Our results align with the CO2-to-NO x emission ratios obtained from the EDGAR v6 emission inventory.
本研究联合应用了中国碳卫星二氧化碳 (CO2)观测数据和欧洲哨兵 5P 卫星 (Sentinel-5 Precursor) 的二氧化氮 (NO2) 观测数据, 选取了中国唐山 (2018 年 5 月 6 日) 和日本东京 (2018 年 3 月 29 日) 两个个例, 定量计算了人为碳排放和 NO2 的相关性. 计算结果表明, 唐山地区和日本东京的CO2/NO2 比例分别为 0.8×10−16 ppm/(molec/cm2) 和 2.3×10−16 ppm/(molec/cm2), CO2和 NO2 浓度升高的相关性分别为 0.54 和 0.47. 对比两个城市的个例表明, 唐山地区的 CO2/NO2 比例要低于东京地区, 这一结果和排放清单给出的结果一致, 论证了通过联合应用中国碳卫星和欧洲哨兵 5P 卫星的协同观测, 可以对 CO2/NO2 排放比例进行定量监测. 下一代碳监测卫星设计工作已开始. 新一代卫星将秉承第一代卫星的技术, 进一步提升探测能力, 以应用需求与科学需求为出发点, 为应对气候变化和碳达峰碳中和提供观测数据.
Keywords: CO2; Remote sensing; TanSat; city carbon emission; climate change.
© Institute of Atmospheric Physics/Chinese Academy of Sciences, and Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2022.