TY - GEN

T1 - Influence of solar 11-year variability on chemical composition of the stratosphere and mesosphere simulated with a chemistry-climate model

AU - Rozanov, E

AU - Schmutz, W

AU - Peter, T

AU - Зубов, Владимир Аркадьевич

AU - Egorova, Tatiana

PY - 2005

Y1 - 2005

N2 - An understanding of observed global chemistry and climate changes caused by solar activity changes is a high priority in modern geosciences. Here, we discuss the influence of the ultraviolet spectral irradiance variability during solar cycle on chemical composition of the stratosphere and mesosphere with chemistry-climate model that fully describes the interactions between chemical and thermo-dynamical processes. We have performed several 20-year long steady-state runs and found a significant influence of solar irradiation on the chemical composition in the stratosphere and mesosphere. An enhanced photolysis during solar maximum results in destruction of methane, nitrous oxide and CFCs providing an increase in the chemical activity of the atmosphere with more pronounced effects in the mesosphere. In the mesosphere, an increase of HOx caused by more intensive water vapor photolysis results in significant ozone depletion there. More intensive methane oxidation gives statistically significant rise to the stratospheric humidity. The influence of dynamical perturbations has been identified over high latitude areas. The response of OH is found to be in a good agreement with observation data. The response of the other species is hard to validate, because of the lack of theoretical and observational studies. (c) 2005 COSPAR. Published by Elsevier Ltd. All rights reserved.

AB - An understanding of observed global chemistry and climate changes caused by solar activity changes is a high priority in modern geosciences. Here, we discuss the influence of the ultraviolet spectral irradiance variability during solar cycle on chemical composition of the stratosphere and mesosphere with chemistry-climate model that fully describes the interactions between chemical and thermo-dynamical processes. We have performed several 20-year long steady-state runs and found a significant influence of solar irradiation on the chemical composition in the stratosphere and mesosphere. An enhanced photolysis during solar maximum results in destruction of methane, nitrous oxide and CFCs providing an increase in the chemical activity of the atmosphere with more pronounced effects in the mesosphere. In the mesosphere, an increase of HOx caused by more intensive water vapor photolysis results in significant ozone depletion there. More intensive methane oxidation gives statistically significant rise to the stratospheric humidity. The influence of dynamical perturbations has been identified over high latitude areas. The response of OH is found to be in a good agreement with observation data. The response of the other species is hard to validate, because of the lack of theoretical and observational studies. (c) 2005 COSPAR. Published by Elsevier Ltd. All rights reserved.

KW - sun

KW - ultraviolet

KW - middle atmosphere

KW - ozone

KW - chemistry

KW - modeling

KW - MIDDLE ATMOSPHERE

KW - PARAMETERIZATION

KW - CYCLE

KW - RADIATION

KW - OZONE

U2 - 10.1016/j.asr.2005.01.048

DO - 10.1016/j.asr.2005.01.048

M3 - статья в сборнике материалов конференции

SN - *************

T3 - ADVANCES IN SPACE RESEARCH-SERIES

SP - 451

EP - 457

BT - INFLUENCE OF THE SUN'S RADIATION AND PARTICLES ON THE EARTH'S ATMOSPHERE AND CLIMATE

A2 - Lastovicka, J

PB - Elsevier

Y2 - 18 July 2004 through 25 July 2004

ER -