Comparison of CO2 measurements in stratosphere by ground-based and satellite methods
A.A. Nikitenko, Yu.M. Timofeev, Ya.A. Virolainen, G.M. Nerobelov, A.V. Poberovskii
Saint-Petersburg State University, St. Petersburg, Russia
Keywords: CO measurements in the stratosphere, carbon dioxide monitoring, ground-based spectroscopic measurements, satellite measurements
Abstract
Modern changes in the Earth's climate due to increase in greenhouse gas concentrations, primarily carbon dioxide, stimulate the monitoring of its content by various methods. In the study, we compared CO2 content in the lower stratosphere (12-18 km altitude layer) from ground-based Bruker 125HR spectrometer and satellite ACE instrument measurements in 2009-2019. The analysis of two measurement types shows a good agreement between them. Ground-based CO2 measurements, on average, exceed satellite data by 2.8 ppm (less than 1%), standard deviations of the differences are ~ 5.0 ppm. The correlation coefficient between two datasets is 0.77. Ground-based (Bruker 125HR) and satellite (ACE) CO2 measurements show weak seasonal variations, opposite to the variations in tropospheric CO2. The CO2 content in the lower stratosphere is maximal in summer and minimal in winter.
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