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Atmospheric and Oceanic Optics

2014 year, number 9

The amplitude of the CO2 seasonal cycle in the atmosphere of Ural by ground-based and satellite remote sensing techniques

N.V. Rokotyan1, R. Imasu2, V.I. Zakharov1, K.G. Gribanov1, M.Yu. Khamatnurova1
1Ural Federal University named after the first President of Russia B.N. Yeltsin, 620083, 51 Lenina, Ekaterinburg, Russia
2Atmosphere and Ocean Research Institute, the University of Tokyo General Research, Building Room No. 315b, 5-1-5 Kashiwanoha, Kashiwashi, Chiba 277-8568, Japan
Keywords: atmospheric remote sensing, FTIR spectrometry, carbon gases, greenhouse gases, CO2, CH4, GOSAT, validation, Ural Atmospheric Station


The series of ground-based high resolution Fourier-transform measurements of atmospheric transmittance in near infrared region (4000–10000 cm–1) recorded at the Ural Atmospheric Station in 2012–2013 was processed in order to retrieve relative concentrations of CO2 and CH4 in atmospheric column. Retrieved values of methane concentration do not show a noticable seasonal cycle, while retrieved CO2 concentrations show clear seasonal variations with high amplitude, which are also observed in GOSAT measurements over Ural region. The estimated amplitude of CO2 seasonal variations is 14–15 ppm. Intercomparison between ground-based and GOSAT measurements of CO2 shows a good agreement, while satellite values are overestimated by approximately 3 ppm. There is no noticable correlation between CH4 values, which one can explain by presence of local methane sources in the area of GOSAT observations.