Skip to content

Sensitivity of a global model to the uptake of N2O5 by tropospheric aerosol

by H. L. MacIntyre, M. J. Evans
Atmospheric Chemistry and Physics ()
Get full text at journal

Abstract

The uptake of N2O5 on aerosol impacts atmospheric concentrations of NOx and so O3, OH, and hence CH4. Laboratory studies show significant variation in the rate of uptake, with a general decline in the value of γN2O5 over the last decade as increasingly relevant tropospheric proxies have been studied. In order to understand the implication of this decline for tropospheric composition, a global model of tropospheric chemistry and transport (GEOS-Chem) is run with differing values of γN2O5 (0.0, 10×10−6, 10×10−4, 10−3, 5×10−3, 10−2, 2×10×10−2, 0.1, 0.2, 0.5, and 1.0). We identify three regimes in the model response. At low values of γN2O5, the model shows reduced sensitivity to the value of γN2O5 as heterogeneous uptake of γN2O5 does not provide a significant pathway to perturb NOx burdens. At high values of γN2O5 the model again shows reduced sensitivity to the value of γN2O5, as NOx loss through heterogeneous removal of γN2O5 is limited by the rate of production of NO3, rather than the rate of heterogeneous uptake. At intermediate values of γN2O5 the model shows significant sensitivity to the value of γN2O5. We find regional differences in the model's response to changing γN2O5. Regions with high aerosol surface area and low temperatures show NO3 production becoming rate limiting at lower γN2O5 values than regions with lower aerosol surface area and higher temperatures. The northern extra-tropics show significant sensitivity to the value of γN2O5 at values consistent with current literature (0.001–0.02), thus an accurate description of γN2O5 is required for adequate simulation of O3 burdens and long-range transport of pollutants in this region.\n Our model simulations also provide insight into the sensitivity of coupled chemistry-aerosol simulations to the choice of γN2O5. We find little change in the global sensitivity of NOx, O3 and OH to γN2O5 in the range 0.05 to 1.0, but a significant drop in sensitivity below this range. Thus simulations of the coupled impact of both chemistry and aerosol changes through time will be sensitive to the choice of γN2O5.

Cite this document (BETA)

Authors on Mendeley

Readership Statistics

21 Readers on Mendeley
by Discipline
 
43% Earth and Planetary Sciences
 
24% Chemistry
 
19% Environmental Science
by Academic Status
 
38% Researcher
 
33% Student > Ph. D. Student
 
10% Professor > Associate Professor
by Country
 
10% United Kingdom
 
5% United States

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Sign up & Download

Already have an account? Sign in