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Chemical Composition of the High Latitude of the Middle Atmosphere of the Northern Hemisphere and its Changes in the 21st Century

  • CHEMICAL PHYSICS OF ATMOSPHERIC PHENOMENA
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Abstract

The chemical composition of the high-latitude of the middle atmosphere of the Northern Hemisphere, including the troposphere, stratosphere, and mesosphere, as well as its change in the 21st century, are considered. The initial data are obtained using the SOCRATES interactive radiation-chemical two-dimensional model, which makes it possible to calculate the altitude profiles of the components with a step of 1 km in the latitude zone 85° S–85° N in steps of 5°. The scenario of the Intergovernmental Panel on Climate Change (IPCC) RCP 4.5 for the conditions in June and January 2000 and 2100 and 50° N is used as the initial conditions. For these conditions, the height profiles and the total content of long-term components are obtained: N2O, CH4, and CO2; CFC-10 (CCl4), CFC-11 (CCl3F), CFC-12 (CCl2F2), CFC-113 (CCl2FCClF2), CFC-114 (CClF2CClF2), CFC-115 (CClF2CF3) chlorofluorocarbons; halon-2011 (CBrClF2) and halon-1301 (CBrF3); hydrochlorofluorocarbon HCFC-22 (CHClF2); HF, HCl, HBr, and HNO3 acids; and small atmospheric components: CH2O, O3,O(3P), O(1D), H, OH, HO2, H2O2, Cl, Cl2, ClO, OClO, HOCl, ClONO2, ClNO2, Cl2O2, N, NO, NO2, NO3, N2O5, HO2NO2, Br, BrO, HOBr, BrONO2, and BrCl, as well as the chemical families Ox (O3 +O(3P)), HOx (OH+HO2), NOx (NO + NO2 + NO3), ClOx (Cl + ClO), and BrOx (Br + BrO). It is shown, in particular, that for June 2100 compared to June 2000, the relative change in % in the total content of the components of the ClOx family in the stratosphere was –57.5%; in the Ox family, +4.0%; in the BrOx family, –25.7%; in the NOx amily, +13.9%, and in the HOx family, ‒4.1%. In January, the corresponding data for ClOx was –59.1%; for Ox, +7.3%; for BrOx, –26.2%; for NOx, +7.1; and for HOx, –3.6%. Similar comparisons are made for the other components mentioned above. Almost all chemically active components show a marked sensitivity to changes in season.

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  1. Semenov Federal Research Center of Chemical Physics, Russian Academy of Sciences, Moscow, Russia

    I. K. Larin

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  1. I. K. Larin
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Larin, I.K. Chemical Composition of the High Latitude of the Middle Atmosphere of the Northern Hemisphere and its Changes in the 21st Century. Russ. J. Phys. Chem. B 16, 492–498 (2022). https://doi.org/10.1134/S1990793122030083

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  • DOI: https://doi.org/10.1134/S1990793122030083

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