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

2010 ◽  
Vol 3 (1) ◽  
pp. 43-67 ◽  
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).

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

2009 ◽  
Vol 2 (2) ◽  
pp. 1157-1213 ◽  
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).

scholarly journals Tagged ozone mechanism for MOZART-4, CAM-chem and other chemical transport models

2012 ◽  
Vol 5 (6) ◽  
pp. 1531-1542 ◽  
Author(s):  
L. K. Emmons ◽  
P. G. Hess ◽  
J.-F. Lamarque ◽  
G. G. Pfister
Keyword(s):  
Transport Model ◽  
Stratospheric Ozone ◽  
Chemical Transport ◽  
Chemical Mechanism ◽  
Chemical Transport Model ◽  
Transport Models ◽  
Chemical Tracers ◽  
Source Contributions ◽  
The Difference ◽  
No Emissions

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.

scholarly journals Implementation and evaluation of an array of chemical solvers in a global chemical transport model

2009 ◽  
Vol 2 (1) ◽  
pp. 185-207 ◽  
Author(s):  
P. Eller ◽  
K. Singh ◽  
A. Sandu ◽  
K. Bowman ◽  
D. K. Henze ◽  
...  
Keyword(s):  
Transport Model ◽  
Chemical Transport ◽  
Chemical Mechanism ◽  
Chemical Transport Model ◽  
Simulation Code ◽  
Programming Effort ◽  
Efficient Code ◽  
Global Chemical Transport Model ◽  
And Performance ◽  
Continuous Adjoint

Abstract. This paper discusses the implementation and performance of an array of gas-phase chemistry solvers for the state-of-the-science GEOS-Chem global chemical transport model. The implementation is based on the Kinetic PreProcessor (KPP). Two perl parsers automatically generate the needed interfaces between GEOS-Chem and KPP, and allow access to the chemical simulation code without any additional programming effort. This work illustrates the potential of KPP to positively impact global chemical transport modeling by providing additional functionality as follows. (1) The user can select a highly efficient numerical integration method from an array of solvers available in the KPP library. (2) KPP offers extreme flexibility for studies that involve changing the chemical mechanism (e.g., a set of additional reactions is automatically translated into efficient code and incorporated into a modified global model). (3) This work provides immediate access to tangent linear, continuous adjoint, and discrete adjoint chemical models, with applications to sensitivity analysis and data assimilation.

MOZART, a global chemical transport model for ozone and related chemical tracers: 2. Model results and evaluation

1998 ◽  
Vol 103 (D21) ◽  
pp. 28291-28335 ◽  
Author(s):  
D. A. Hauglustaine ◽  
G. P. Brasseur ◽  
S. Walters ◽  
P. J. Rasch ◽  
J.-F. Müller ◽  
...  
Keyword(s):  
Transport Model ◽  
Chemical Transport ◽  
Chemical Transport Model ◽  
Chemical Tracers ◽  
Global Chemical Transport Model

scholarly journals Implementation and evaluation of an array of chemical solvers in the Global Chemical Transport Model GEOS-Chem

2009 ◽  
Vol 2 (2) ◽  
pp. 89-96 ◽  
Author(s):  
P. Eller ◽  
K. Singh ◽  
A. Sandu ◽  
K. Bowman ◽  
D. K. Henze ◽  
...  
Keyword(s):  
Transport Model ◽  
Chemical Transport ◽  
Chemical Mechanism ◽  
Chemical Transport Model ◽  
Simulation Code ◽  
Programming Effort ◽  
Efficient Code ◽  
Global Chemical Transport Model ◽  
And Performance ◽  
Continuous Adjoint

Abstract. This paper discusses the implementation and performance of an array of gas-phase chemistry solvers for the state-of-the-science GEOS-Chem global chemical transport model. The implementation is based on the Kinetic PreProcessor (KPP). Two perl parsers automatically generate the needed interfaces between GEOS-Chem and KPP, and allow access to the chemical simulation code without any additional programming effort. This work illustrates the potential of KPP to positively impact global chemical transport modeling by providing additional functionality as follows. (1) The user can select a highly efficient numerical integration method from an array of solvers available in the KPP library. (2) KPP offers a wide variety of user options for studies that involve changing the chemical mechanism (e.g., a set of additional reactions is automatically translated into efficient code and incorporated into a modified global model). (3) This work provides access to tangent linear, continuous adjoint, and discrete adjoint chemical models, with applications to sensitivity analysis and data assimilation.

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

1998 ◽  
Vol 103 (D21) ◽  
pp. 28265-28289 ◽  
Author(s):  
G. P. Brasseur ◽  
D. A. Hauglustaine ◽  
S. Walters ◽  
P. J. Rasch ◽  
J.-F. Müller ◽  
...  
Keyword(s):  
Transport Model ◽  
Chemical Transport ◽  
Model Description ◽  
Chemical Transport Model ◽  
Chemical Tracers ◽  
Global Chemical Transport Model

scholarly journals Tagged ozone mechanism for MOZART-4, CAM-chem, and other chemical transport models

2012 ◽  
Vol 5 (3) ◽  
pp. 1949-1985 ◽  
Author(s):  
L. K. Emmons ◽  
P. G. Hess ◽  
J.-F. Lamarque ◽  
G. G. Pfister
Keyword(s):  
Transport Model ◽  
Stratospheric Ozone ◽  
Chemical Transport ◽  
Chemical Mechanism ◽  
Chemical Transport Model ◽  
Transport Models ◽  
Chemical Tracers ◽  
The Difference ◽  
Artificial Tracers ◽  
No Emissions

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. 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.

scholarly journals Estimates of mercury flux into the United States from non-local and global sources: results from a 3-D CTM simulation

2008 ◽  
Vol 8 (6) ◽  
pp. 19861-19890 ◽  
Author(s):  
B. A. Drewniak ◽  
V. R. Kotamarthi ◽  
D. Streets ◽  
M. Kim ◽  
K. Crist
Keyword(s):  
United States ◽  
Transport Model ◽  
Source Region ◽  
The United States ◽  
Chemical Transport Model ◽  
Wet And Dry Deposition ◽  
Chemical Tracers ◽  
Non Local ◽  
Global Chemical Transport Model ◽  
No Emissions

Abstract. The sensitivity of Hg concentration and deposition in the United States to emissions in China was investigated by using a global chemical transport model: Model for Ozone and Related Chemical Tracers (MOZART). Two forms of gaseous Hg were included in the model: elemental Hg (HG(0) and oxidized or reactive Hg (HGO). We simulated three different emission scenarios to evaluate the model's sensitivity. One scenario included no emissions from China, while the others were based on different estimates of Hg emissions in China. The results indicated, in general, that when Hg emissions were included, HG(0) concentrations increased both locally and globally. Increases in Hg concentrations in the United States were greatest during spring and summer, by as much as 7%. Ratios of calculated concentrations of Hg and CO near the source region in eastern Asia agreed well with ratios based on measurements. Increases similar to those observed for HG(0) were also calculated for deposition of HGO. Calculated increases in wet and dry deposition in the United States were 5–7% and 5–9%, respectively. The results indicate that long-range transcontinental transport of Hg has a non-negligible impact on Hg deposition levels in the United States.

scholarly journals Regional and intercontinental pollution signatures on modeled and measured PAN at northern mid-latitude mountain sites

2018 ◽  
Author(s):  
Arlene M. Fiore ◽  
Emily V. Fischer ◽  
Shubha Pandey Deolal ◽  
Oliver Wild ◽  
Dan Jaffe ◽  
...  
Keyword(s):  
Transport Model ◽  
Ozone Production ◽  
Anthropogenic Emissions ◽  
Chemical Transport Model ◽  
Reservoir Species ◽  
Remote Troposphere ◽  
Global Chemical Transport Model ◽  
Peroxy Acetyl Nitrate ◽  
Source Receptor Relationships

Abstract. Peroxy acetyl nitrate (PAN) is the most important reservoir species for nitrogen oxides (NOx) in the remote troposphere. Upon decomposition in remote regions, PAN promotes efficient ozone production. We evaluate monthly mean PAN abundances from global chemical transport model simulations (HTAP1) for 2001 with measurements from five northern mid-latitude mountain sites (four European and one North American). The multi-model mean generally captures the observed monthly mean PAN but individual models simulate a factor of ~ 4–8 range in monthly abundances. We quantify PAN source-receptor relationships at the measurement sites with sensitivity simulations that decrease regional anthropogenic emissions of PAN (and ozone) precursors by 20 % from North America (NA), Europe (EU), and East Asia (EA). The HTAP1 models attribute more of the observed PAN at Jungfraujoch (Switzerland) to emissions in NA and EA, and less to EU, than a prior trajectory-based estimate. The trajectory-based and modeling approaches agree that EU emissions play a role in the observed springtime PAN maximum at Jungfraujoch. The signal from anthropogenic emissions on PAN is strongest at Jungfraujoch and Mount Bachelor (Oregon, U.S.A.) during April. In this month, PAN source-receptor relationships correlate both with model differences in regional anthropogenic volatile organic compound (AVOC) emissions and with ozone source-receptor relationships. PAN observations at mountaintop sites can thus provide key information for evaluating models, including links between PAN and ozone production and source-receptor relationships. Establishing routine, long-term, mountaintop measurements is essential given the large observed interannual variability in PAN.

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