Global simulation of tropospheric O3-NOx-hydrocarbon chemistry: 2. Model evaluation and global ozone budget
TLDR
In this paper, a global three-dimensional model for tropospheric O3-NOx-hydrocarbon chemistry is presented and evaluated with surface, ozonesonde, and aircraft measurements.Abstract:
Results from a global three-dimensional model for tropospheric O3-NOx-hydrocarbon chemistry are presented and evaluated with surface, ozonesonde, and aircraft measurements. Seasonal variations and regional distributions of ozone, NO, peroxyacetylnitrate (PAN), CO, ethane, acetone, and H2O2 are examined. The model reproduces observed NO and PAN concentrations to within a factor of 2 for a wide range of tropospheric regions including the upper troposphere but tends to overestimate HNO3 concentrations in the remote troposphere (sometimes several fold). This discrepancy implies a missing sink for HNO3 that does not lead to rapid recycling of NOx; only in the upper troposphere over the tropical South Atlantic would a fast conversion of HNO3 to NOx improve the model simulation for NOx. Observed concentrations of acetone are reproduced in the model by including a large biogenic source (15 Tg C yr−1), which accounts for 40% of the estimated global source of acetone (37 Tg C yr−1). Concentrations of H2O2 in various regions of the troposphere are simulated usually to within a factor of 2, providing a test for HOx chemistry in the model. The model reproduces well the observed concentrations and seasonal variations of ozone in the troposphere, with some exceptions including an underestimate of the vertical gradient across the tropical trade wind inversion. A global budget analysis in the model indicates that the supply and loss of tropospheric ozone are dominated by photochemistry within the troposphere and that NOx. emitted in the southern hemisphere is twice as efficient at producing ozone as NOx emitted in the northern hemisphere.read more
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Journal ArticleDOI
Global modeling of tropospheric chemistry with assimilated meteorology : Model description and evaluation
Isabelle Bey,Daniel J. Jacob,Robert M. Yantosca,Jennifer A. Logan,B. D. Field,Arlene M. Fiore,Qinbin Li,Honguy Y. Liu,Loretta J. Mickley,Martin G. Schultz +9 more
TL;DR: The GEOS-CHEM model as mentioned in this paper is a 3D model of tropospheric chemistry driven by assimilated meteorological observations from the Goddard Earth Observing System (GEOS) of the NASA Data Assimilation Office (DAO).
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Heterogeneous chemistry and tropospheric ozone
TL;DR: In this article, it is recommended that standard O 3 models include in their chemical mechanisms the following reaction probability parameterizations for reactive uptake of gases by aqueous aerosols and clouds: γ HO 2 =0.2 (range 0.1-1) for HO 2 → 0.5 H 2 O 2, γ NO 2 =10 −4 (10 −6 −10 −3 ) for NO 2 → HNO 3, and γ N 2 O 5 → 2 H NO 3.
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A global simulation of tropospheric ozone and related tracers: Description and evaluation of MOZART, version 2
Larry W. Horowitz,Stacy Walters,Denise L. Mauzerall,Louisa K. Emmons,Philip J. Rasch,Claire Granier,Claire Granier,Xuexi Tie,Jean-Francois Lamarque,Martin G. Schultz,Geoffrey S. Tyndall,John J. Orlando,Guy Brasseur +12 more
TL;DR: The Model of Ozone and Related Chemical Tracers (MOZART) as discussed by the authors is based on the NCAR Model of Atmospheric Transport and Chemistry (MATCH) and can easily be driven with various meteorological inputs and model resolutions.
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Three-dimensional climatological distribution of tropospheric OH: Update and evaluation
C. M. Spivakovsky,Jennifer A. Logan,Stephen A. Montzka,Yves Balkanski,M. Foreman-Fowler,Dylan B. A. Jones,Larry W. Horowitz,Andrew C. Fusco,Carl A. M. Brenninkmeijer,Michael J. Prather,Steven C. Wofsy,Michael B. McElroy +11 more
TL;DR: A global climatological distribution of tropospheric OH is computed using observed distributions of O3, H2O, NOt (NO2 +NO + 2N2O5 + NO3 + HNO2+HNO4), CO, hydrocarbons, temperature, and cloud optical depth as discussed by the authors.
Journal ArticleDOI
Global distribution and climate forcing of carbonaceous aerosols
Serena H. Chung,John H. Seinfeld +1 more
TL;DR: In this paper, the global distribution of carbonaceous aerosols is simulated online in the Goddard Institute for Space Studies General Circulation Model II-prime (GISS GCM IIprime).
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