|
Atmos. Chem. Phys. Discuss., 12, 20239-20289, 2012
www.atmos-chem-phys-discuss.net/12/20239/2012/ doi:10.5194/acpd-12-20239-2012 © Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License. |
Off-line algorithm for calculation of vertical tracer transport in the troposphere due to deep convection
1Center for Global Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
2SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
3Institute for Marine and Atmospheric Research Utrecht (IMAU), Princetonplein 5, 3584 CC Utrecht, The Netherlands
4Wageningen University and Research Centre, Droevendaalsesteeg 4, 6708 PB Wageningen, The Netherlands
5School of GeoSciences, University of Edinburgh, King's Buildings, West Mains Road, Edinburgh, EH9 3JN, UK
6School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK
7Goddard Earth Sciences and Technology Center, NASA Goddard Space Flight Center, Code 613.3, Greenbelt, MD 20771, USA
8ECMWF, Shinfield Park, Reading, Berks, RG2 9AX, UK
9Atmospheric, Earth, and Energy Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, USA
10Universite de Versailles Saint Quentin en Yvelines (UVSQ), Gif-sur-Yvette, France
11Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
12Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA
13Centre for Australian Weather and Climate Research, CSIRO Marine and Atmospheric Research, 107-121 Station St., Aspendale, VIC 3195, Australia
14Cornell University, 2140 Snee Hall, Ithaca, NY 14853, USA
15Department of Geography and Environmental Studies Program, Western Michigan University, Kalamazoo, MI 49008, USA
16Research Institute for Global Change/JAMSTEC, 3173-25 Show-machi, Yokohama, 2360001, Japan
17Center for Global Change Science, Building 54, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Abstract. A modified cumulus convection parametrisation scheme is presented. This scheme computes the mass of air transported upward in a cumulus cell using conservation of moisture and a detailed distribution of convective precipitation provided by a reanalysis dataset. The representation of vertical transport within the scheme includes entrainment and detrainment processes in convective updrafts and downdrafts. Output from the proposed parametrisation scheme is employed in the National Institute for Environmental Studies (NIES) global chemical transport model driven by JRA-25/JCDAS reanalysis. The simulated convective precipitation rate and mass fluxes are compared with observations and reanalysis data. A simulation of the short-lived tracer 222Rn is used to further evaluate the performance of the cumulus convection scheme. Simulated distributions of 222Rn are validated against observations at the surface and in the free troposphere, and compared with output from models that participated in the TransCom-CH4 Transport Model Intercomparison. From this comparison, we demonstrate that the proposed convective scheme can successfully reproduce deep cloud convection.
Citation: Belikov, D. A., Maksyutov, S., Krol, M., Fraser, A., Rigby, M., Bian, H., Agusti-Panareda, A., Bergmann, D., Bousquet, P., Cameron-Smith, P., Chipperfield, M. P., Fortems-Cheiney, A., Gloor, E., Haynes, K., Hess, P., Houweling, S., Kawa, S. R., Law, R. M., Loh, Z., Meng, L., Palmer, P. I., Patra, P. K., Prinn, R. G., Saito, R., and Wilson, C.: Off-line algorithm for calculation of vertical tracer transport in the troposphere due to deep convection, Atmos. Chem. Phys. Discuss., 12, 20239-20289, doi:10.5194/acpd-12-20239-2012, 2012.