Aerosol and thermodynamic effects on tropical cloud systems during TWPICE and ACTIVE 1Centre for Australian Weather and Climate Research – A partnership between the Bureau of Meteorology and CSIRO, Australia
2University of Manchester, UK
Received: 30 May 2008 – Published in Atmos. Chem. Phys. Discuss.: 24 Jul 2008 – Published: 06 Jan 2009Abstract. Regularly occurring storms over the Tiwi Islands, north of Darwin, Australia
are used as a laboratory for investigating the relative importance of
thermodynamic parameters, shear and aerosols on the amount and intensity of
convection over the islands during the pre-monsoon and monsoon break periods
of the 2005–2006 summer wet season. Storm systems on individual days are
characterised by simple metrics derived from polarimetric radar data. The
analysis shows clear dependencies on thermodynamic and shear parameters. The
shear dependence was unexpected, as high shear implied less activity, but
this is likely an island effect. There are some indications of a dependence
of storm intensity on aerosol, but mid-level moisture differences may also
play a role.
Citation: May, P. T., Allen, G., Vaughan, G., and Connolly, P.: Aerosol and thermodynamic effects on tropical cloud systems during TWPICE and ACTIVE, Atmos. Chem. Phys., 9, 15-24, doi:10.5194/acp-9-15-2009, 2009.