MOZART, a global chemical transport model for ozone and related chemical tracers: 1. Model description

Abstract. A procedure for tagging ozone produced from NO sources through updates to an existing chemical mechanism is described, and results from its implementation in the Model for Ozone and Related chemical Tracers (MOZART-4), a global chemical transport model, are presented. Artificial tracers are added to the mechanism, thus, not affecting the standard chemistry. The results are linear in the troposphere, i.e., the sum of ozone from individual tagged sources equals the ozone from all sources to within 3% in zonal mean monthly averages. In addition, the tagged ozone is shown to equal the standard ozone, when all tropospheric sources are tagged and stratospheric input is turned off. The stratospheric ozone contribution to the troposphere determined from the difference between total ozone and ozone from all tagged sources is significantly less than estimates using a traditional stratospheric ozone tracer (8 vs. 20 ppbv at the surface). The commonly used technique of perturbing NO emissions by 20% in a region to determine its ozone contribution is compared to the tagging technique, showing that the tagged ozone is 2–4 times the ozone contribution that was deduced from perturbing emissions. The ozone tagging described here is useful for identifying source contributions based on NO emissions in a given state of the atmosphere, such as for quantifying the ozone budget.

Download Full-text

Supplementary material to "Attribution of ground-level ozone to anthropogenic and natural sources of NO<sub>x</sub> and reactive carbon in a global chemical transport model"

10.5194/acp-2020-436-supplement ◽

2020 ◽

Author(s):

Tim Butler ◽

Aurelia Lupascu ◽

Aditya Nalam

Keyword(s):

Transport Model ◽

Ground Level ◽

Chemical Transport ◽

Chemical Transport Model ◽

Natural Sources ◽

Ground Level Ozone ◽

Reactive Carbon ◽

Supplementary Material ◽

Global Chemical Transport Model

Download Full-text

Description and evaluation of the Model for Ozone and Related chemical Tracers, version 4 (MOZART-4)

Geoscientific Model Development ◽

10.5194/gmd-3-43-2010 ◽

2010 ◽

Vol 3 (1) ◽

pp. 43-67 ◽

Cited By ~ 1096

Author(s):

L. K. Emmons ◽

S. Walters ◽

P. G. Hess ◽

J.-F. Lamarque ◽

G. G. Pfister ◽

...

Keyword(s):

Transport Model ◽

Source Code ◽

Chemical Mechanism ◽

Chemical Transport Model ◽

Chemical Tracers ◽

Photolysis Frequencies ◽

Community Data ◽

Data Portal ◽

Global Chemical Transport Model ◽

Hydrocarbon Chemistry

Abstract. The Model for Ozone and Related chemical Tracers, version 4 (MOZART-4) is an offline global chemical transport model particularly suited for studies of the troposphere. The updates of the model from its previous version MOZART-2 are described, including an expansion of the chemical mechanism to include more detailed hydrocarbon chemistry and bulk aerosols. Online calculations of a number of processes, such as dry deposition, emissions of isoprene and monoterpenes and photolysis frequencies, are now included. Results from an eight-year simulation (2000–2007) are presented and evaluated. The MOZART-4 source code and standard input files are available for download from the NCAR Community Data Portal (http://cdp.ucar.edu).

Download Full-text