Influence of air temperature on air composition in Moscow

• Published in: IOP Conference Series: Earth and Environmental Science
• Main Authors: Lokoshchenko, M A, Bogdanovich, A Yu, Elansky, N F
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: IOP Publishing 2022
• Subjects: Arctic
• Online Access: http://dx.doi.org/10.1088/1755-1315/1040/1/012007; https://iopscience.iop.org/article/10.1088/1755-1315/1040/1/012007; https://iopscience.iop.org/article/10.1088/1755-1315/1040/1/012007/pdf

Abstract Empirical relations between T and surface concentrations of CO 2 and five minor air gases have been studied on a base of hourly data during 12 years. In wide range -6…+15 °C significant changes of minor gases are absent. Real tendencies are increase of O 3 and, vice versa, fall of NO and NO 2 with increasing T from +15.+17 to +38 °C. Both effects are a consequence of unstable stratification that enhances vertical mixing. In cool weather -7.-18 °C O 3 falls whereas nitrogen oxides grow with decreasing T due to frequent inversions and slowing down the NO oxidation rate. At an even lower temperature up to -30 °C NO and NO 2 , vice versa, decrease with decreasing T – probably, due to strong cold advection of clean Arctic air. Unlike minor gases, CO 2 decreases with increasing T up to 25 °C due to photosynthesis intensification from winter to summer. Seeming growth of CO at T>27 °C is fully explained by smoky haze during heat waves in 2010 and 2002. The CO 2 growth in hot weather is also created by heat stress of trees. Thus, except only oxidation rate, any influence of T is indirect as a result of stratification, photosynthesis, smoky haze, advection, etc.