Oslo CTM3 Chemistry : The troposphere
The tropospheric chemistry module
The tropospheric chemistry scheme is run with a numerical time step of
15 minutes (5 minutes for OH/HO2/RO2-reactions),
contains 46 species and also some intermediate short lived species
treated within chemistry only.
The scheme takes into account 86 thermal reactions, 17 photolytic
reactions and 2 heterogeneous reactions (which are independent of the
stratospheric heterogeneous chemistry).
It includes detailed hydrocarbon chemistry and has been thoroughly
tested (Berntsen and Isaksen, 1997; Kraabøl et al.,
1999; Berglen et al., 2004; Brunner et al., 2003).
The main reference for the tropospheric chemistry is Berntsen and Isaksen (1997).
Tropospheric components
Listed here are all the components in the tropospheric module of the
Oslo CTM3, whether they are transported (T=Y) or not (T=N), and also
the chemical domain of interest (C): T is troposphere only,
and B is both tropopshere and stratosphere. Wet deposition is listed as WD.
| Nr | Component | T/C | WD | Remarks |
| 01 | O3 | Y/B | Y | |
| 04 | HNO3 | Y/B | Y | |
| 05 | PANx | Y/T | (PAN+CH3COO2) | |
| 06 | CO | Y/B | ||
| 07 | C2H4 | Y/T | ||
| 08 | C2H6 | Y/T | ||
| 09 | C3H6 | Y/T | ||
| 10 | C4H10 | Y/T | ||
| 11 | C6H14 | Y/T | ||
| 12 | C6HXR | Y/T | m-xylene | |
| 13 | CH2O | Y/B | Y | |
| 14 | CH3CHO | Y/T | Y | |
| 15 | H2O2 | Y/B | Y | |
| 16 | CH3O2H | Y/B | Y | |
| 17 | HO2NO2 | Y/B | Y | |
| 18 | CH3COY | Y/T | CH3COCOCH3 | |
| 19 | CH3COX | Y/T | CH3COC2H5 | |
| 20 | Isoprene | Y/T | C5H8 | |
| 21 | HO2 | Y/B | ||
| 22 | CH3O2 | N/B | ||
| 23 | C2H5O2 | N/T | ||
| 24 | C4H9O2 | N/T | ||
| 25 | C6H13O2 | N/T | ||
| 27 | CH3COB | N/T | CH3COCH(O2)CH3 | |
| 28 | CH3XX | N/T | CH3CH(O2)CH2OH | |
| 29 | AR1 | N/T | first RO2 radical from the reaction of m-xylene + OH | |
| 30 | AR2 | N/T | a C-5 carbonyl compound; from the reaction of AR1 + NO | |
| 31 | AR3 | N/T | a C-5 RO2 radical; from the reaction of AR2 + OH | |
| 32 | ISOR1 | N/T | first RO2 radical from the reaction of isoprene + OH | |
| 33 | ISOK | N/T | Y | methylvinylketone (MVK) + methacrolein (MACR) |
| 34 | ISOR2 | N/T | RO2 radical formed from MVK+OH or MACR+OH | |
| 35 | HCOHCO | Y/T | ||
| 36 | RCOHCO | Y/T | ||
| 37 | CH3X | Y/T | CH3COO2 | |
| 38 | O(3P) | N/B | ||
| 39 | O(1D) | N/B | ||
| 40 | OH | N/B | ||
| 41 | NO3 | Y/B | ||
| 42 | N2O5 | Y/B | ||
| 43 | NO | Y/B | ||
| 44 | NO2 | Y/B | ||
| 46 | CH4 | Y/B | ||
| 48 | C3H8 | Y/T | ||
| 49 | C3H7O2 | Y/T | ||
| 50 | Acetone | Y/T | CH3C(O)CH3 | |
| 51 | CH3COD | Y/T | CH3COCH2(O2) |
Berglen, T. F., T. K. Berntsen, I. S. A. Isaksen, and J. K. Sundet: A global model of the coupled sulfur/oxidant chemistry in the troposphere: The sulfur cycle, J. Geophys. Res., 109(D19310), doi:10.1029/2003JD003948, 2004.
Berntsen, T., and I. S. A. Isaksen: A global 3-D chemical transport model for the troposphere, 1, Model description and CO and Ozone results, J. Geophys. Res., 102(D17), 21239-21280, doi:10.1029/97JD01140, 1997.
Brunner, D.; J. Staehelin, H. L. Rogers, M. O. Köhler, J. A. Pyle, D. Hauglustaine, L. Jourdain, T. K. Berntsen, M. Gauss, I. S. A. Isaksen, E. Meijer, P. van Velthoven, G. Pitari, E. Mancini, V. Grewe, and R. Sausen: An evaluation of the performance of chemistry transport models by comparison with research aircraft observations. Part 1: Concepts and overall model performance. Atmos. Chem. Phys., 3, 1609-1631, doi:10.5194/acp-3-1609-2003, 2003.
Kraabøl, A. G., F. Stordal, P. Konopka, and S. Knudsen: The NILU aircraft plume model: A technical description. Technical Report TR 4/99, Norwegian Institute for Air Research, 1999.