Typical and Anomalous CO Total Column Variations over Moscow and Beijing
Rakitin, Vadim1; Dzhola, Anatoly1; Fokeeva, Ekaterina1; Grechko, Evgeny1; Yurganov, Leonid2; Safronov, Alexandr1; Gorchilina, Anna1
1Obukhov Institute of Atmospheric Physics RAS, RUSSIAN FEDERATION; 2Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, MD, USA, UNITED STATES
We present the results of the CO total column (TC) spectroscopic measurements over Zvenigorod Scientific Station (ZSS) and Moscow for period from 1972 to 2012 years and over Beijing for 1992-2012 years. The rural CO TC over ZSS decreased by 0.1<:>0.5 % per year for different assessment techniques in 1972-2012.
Using the trajectory analysis we have calculated the average ("model") seasonal rural CO TC variations for all years of measurements (i.e., all events of Moscow emissions impact upon rural CO TC were excluded from these retrievals). Also we have estimated the effect of Moscow pollution sources upon the CO rural TC to be small: the percentage of days with ZSS CO TC exceeding average seasonal rural means more than 10% (i. e., typical STD of diurnal TC in the rural area) was found ~5%.
The rate of decrease in the anthropogenic part of CO TC (total urban minus rural) was estimated at 0.9<:>1.1 % per year for 1974-2012 for different assessment techniques in spite of multiple increase of the motor vehicles number in Moscow. The rate of decrease of CO TC Moscow urban part for 2001-2012 is 2-4 % per year for different assessment techniques.
The average annual CO emissions in Moscow are estimated as 2.7 ± 0.9 Tg/year for 2005-2010 years.
There are no significant changes in CO TC over Beijing for whole period of measurements (1992-2012 years). The rate of decrease of anthropogenic portion CO TC over Beijing for 2001-2012 years was estimated ~0.8<:>2.2 % per year for different assessment methods. The number of events of strong atmospheric CO pollution (anthropogenic portion CO TC ≥2.96E+18 molec/sm2) is ~20% of total days in Beijing and ~5 % in Moscow, for 1992-2012 years.
Some results of validation orbital (MOPITT, AIRS, IASI) sensors and ground based CO data sets for typical and anomalous conditions for Moscow megapolis are presented.