Atmos. Chem. Phys. Discuss., 12, 12229-12244, 2012
www.atmos-chem-phys-discuss.net/12/12229/2012/
doi:10.5194/acpd-12-12229-2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Tropical convective transport and the Walker circulation
J. S. Hosking1,*, M. R. Russo1,2, P. Braesicke1,2, and J. A. Pyle1,2
1Centre for Atmospheric Science, University of Cambridge, UK
2National Centre for Atmospheric Science, University of Cambridge, UK
*now at: British Antarctic Survey, Cambridge, UK

Abstract. We introduce a methodology to visualise rapid vertical and zonal tropical transport pathways. Using prescribed sea-surface temperatures in four monthly model integrations for 2005, preferred transport routes from the troposphere to the stratosphere are found in the model over the Maritime Continent (MC) in November and February, i.e., boreal winter. In these months, the ascending branch of the Walker Circulation over the MC is formed in conjunction with strong deep convection, allowing fast transport into the stratosphere. At the same time, the downwelling branch of the Walker Circulation is enhanced over the East Pacific, compared to other months in 2005, reducing locally the upward transport from emissions below. We conclude that the Walker circulation plays an important role in the seasonality of fast tropical transport from the troposphere to the stratosphere and so impacts at the same time the potential supply of surface emissions.

Citation: Hosking, J. S., Russo, M. R., Braesicke, P., and Pyle, J. A.: Tropical convective transport and the Walker circulation, Atmos. Chem. Phys. Discuss., 12, 12229-12244, doi:10.5194/acpd-12-12229-2012, 2012.
 
Search ACPD
Discussion Paper
    XML
    Citation
    Final Revised Paper
    Share