Variations in the column-average dry-air mole fractions of CO2 in the vicinity of St. Petersburg |
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| Authors: | A V Rakitin A V Poberovskii Yu M Timofeev M V Makarova T J Conway |
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| Institution: | 1. St. Petersburg State University, ul. Ul’yanovskaya 1, Petrodvorets, 198504, Russia
2. Earth System Research Laboratory, Global Monitoring Division, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO, 80305-3337, USA
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| Abstract: | The results obtained from ground-based spectroscopic measurements of column-average dry-air mole fractions of CO2 in the atmosphere over the St. Petersburg region are given for the period April 2009–October 2011 (～900 measurement runs, 151 measurement days). These results show significant variations in the CO2 mixing ratio in the atmosphere over the St. Petersburg region. The minimum value of this mixing ratio (373.1 ppm) was observed on April 27, 2011, and its maximum value (420.8 ppm) was observed on February 10, 2010. The typical seasonal behavior of the CO2 mixing ratio with its summer minimum was observed in 2009. In July 2010 and 2011, the values of the CO2 mixing ratio increased apparently due to high air temperatures. In 2010 an additional contribution to this increase in the CO2 mixing ratio could have been made by strong natural fires. |
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