Spatial and Temporal Distributions of Atmospheric CO 2 in East China Based on Data from Three Satellites
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• Original Paper •
Spatial and Temporal Distributions of Atmospheric CO2 in East China Based on Data from Three Satellites Bozhen LI1, Gen ZHANG2, Lingjun XIA1, Ping KONG1, Mingjin ZHAN*1, and Rui SU3 1Jiangxi 2State
Ecological Meteorology Center, Nanchang 330096, China
Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of China Meteorological Administration, Chinese Academy of Meteorological Sciences, Beijing 100081, China 3Jiangxi
Atmospheric Detection Technology Center, Nanchang 330096, China
(Received 29 April 2020; revised 10 August 2020; accepted 10 August 2020) ABSTRACT East China (23.6°–38.4°N, 113.6°–122.9°E) is the largest developed region in China. Based on CO2 products retrieved from the Greenhouse Gases Observing Satellite (GOSAT), the spatial and temporal distributions of CO2 mixing ratios in East China during 2014–17 are discussed, and the retrieved CO2 from AIRS (Atmospheric Infrared Sounder) and OCO-2 (Orbiting Carbon Observatory-2), as well as WLG (Waliguan) background station observations, are compared with those of GOSAT. The annual CO2 retrieved from GOSAT in East China ranged from 398.96 ± 0.24 ppm in 2014 to 407.39 ± 0.20 ppm in 2017, with a growth rate of 2.82 ± 0.15 ppm yr−1, which were higher than in other regions of China. The seasonal cycle presented a maximum in spring and a minimum in summer or autumn. Higher values were mainly concentrated in the coastal areas of Zhejiang Province, and lower values were concentrated in Jiangxi and the north of Fujian Province. CO2 observed in Fujian and parts of Jiangxi increased by less than 1.0 ppm during 2014–15, but enhanced significantly by more than 5.0 ppm during 2015–16, perhaps influenced by local emissions and global impacts. We calculated year-to-year CO2 enhancements in the Yangtze River Delta region during 2014–17 that were relatively low and stable, due to the region’s carbon emissions control and reduction policies. The annual and seasonal amplitudes of CO2 retrieved from AIRS were lower than those from GOSAT in East China, probably owing to the CO2 retrieved from AIRS better reflecting the characteristics of the mid-troposphere, while GOSAT is more representative of near-surface CO2. The spatial and temporal distribution characteristics of CO2 retrieved from OCO-2 were close to those from GOSAT in East China. Key words: CO2, East China, GOSAT, AIRS, OCO-2 Citation: Li, B. Z., G. Zhang, L. J. Xia, P. Kong, M. J. Zhan, and R. Su, 2020: Spatial and temporal distributions of atmospheric CO2 in East China based on data from three satellites. Adv. Atmos. Sci., 37(12), 1323−1337, https://doi.org/10. 1007/s00376-020-0123-6. Article Highlights:
• CO2 mixing ratios from GOSAT, AIRS and OCO-2 presented high values in spring and low values in summer or autumn in East China.
• Annual CO2 retrieved from GOSAT, AIRS and OCO-2 increased year by year from 2014 to 2017 in different regions of China.
• The largest variation of annual CO2 was found in Fujian in 2016, but the Yangtze River Delta region showed a more
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