Direct and indirect impacts of Saharan dust acting as cloud condensation nuclei on tropical cyclone eyewall development

Henian Zhang, Greg M. McFarquhar, William R. Cotton, Yi Deng

Research output: Contribution to journalArticle

Abstract

The mechanisms by which Saharan dust acting as cloud condensation nuclei (CCN) impact tropical cyclone (TC) evolution were examined by conducting numerical simulations of a mature TC with CCN added from lateral boundaries. CCN can affect eyewall development directly through release of latent heat when activated and subsequent growth of cloud droplets and indirectly through modulating rainband development. Convection in the rainbands was negatively correlated with that in the eyewall in all simulations. The development of rainbands tended to promote latent heat release away from the eyewall, block the surface inflow and enhance cold pools. The maximum impact of rainbands on the eyewall (or vice versa) occurred with a time lag of 3.5 to 5.5 hr. The convection in the eyewall and rainbands did not show a monotonie relationship to input CCN due to the non-linear feedback of heating from a myriad of microphysical processes on storm dynamics.

Original languageEnglish (US)
Article numberL06802
JournalGeophysical Research Letters
Volume36
Issue number6
DOIs
StatePublished - Mar 28 2009

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Fingerprint Dive into the research topics of 'Direct and indirect impacts of Saharan dust acting as cloud condensation nuclei on tropical cyclone eyewall development'. Together they form a unique fingerprint.

  • Cite this