Abstract
The analysis of the CO and CH4 total column (TC) as well as aerosol optical depth (AOD) data in urban and background regions of Eurasia for different seasons and periods from 1998 to 2016 years is presented. Trends estimates based on longterm spectroscopic datasets of OIAP RAS (Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences) for stations Moscow, Zvenigorod (ZSS, Moscow province), Zotino (ZOTTO, Central Siberia), Beijing (joint site of OIAP RAS and IAP CAS (Institute of Atmospheric Physics, Chinese Academy of Sciences)), SPbSU stations Peterhof and NDACC stations located in Eurasia were compared between themselves and with similar assessments obtained from satellite data. Significant decrease of anthropogenic CO in megacities Moscow (3.5±2.2%/yr) and Beijing (1.4±1.4%/yr) in autumn months of 1998−2016 were found according ground-based spectroscopic observations. In spite of total anthropogenic CO emissions decrease (for Europe and China) and absence of growth of wild-fires emissions in 2007−2016 we found that CO TC in background regions of Northern Eurasia has stabilized or increased in summer and autumn months of 2007−2016. Decrease of AOD over Central and Southern Europe and over China (1−5%/ yr) was observed after 2007. Since 2007 an increase in CH4 TC trends over Northern Europe as well as for tropical belt of Eurasia has been obtained. Analysis of satellite observations AIRS v6 of CO and CH4 TC and MODIS AOD data confirmed the ground-based estimates of trends.
Highlights
We present an analysis of recent changes in total content trends of important atmospheric compounds such as carbon monoxide (CO), methane (CH4) and aerosols
SPbSU and NDACC and comparison of the CO trends distribution with the same for CH4 and aerosol optical depth (AOD) based on satellite observations, for different Eurasian regions, seasons and time periods
Typical levels of anthropogenic CO and aerosols atmospheric pollution in Beijing are 2–5 times higher in comparison with Moscow ones, that is in good agreement with our previous results (Rakitin et al 2011; Wang et al 2014; Golitsyn et al 2015)
Summary
We present an analysis of recent changes in total content trends of important atmospheric compounds such as carbon monoxide (CO), methane (CH4) and aerosols.Carbon monoxide is one of major atmospheric pollutants. SPbSU and NDACC and comparison of the CO trends distribution with the same for CH4 and AOD based on satellite observations, for different Eurasian regions, seasons and time periods.
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