The effect of subtropical aerosol loading on equatorial precipitation

G. Dagan*, R. Chemke

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Cloud-aerosol interactions are considered as one of the largest sources of uncertainties in the study of climate change. Here another possible cloud-aerosol effect on climate is proposed. A series of large eddy simulations (LES) with bin microphysics reveal a sensitivity of the total atmospheric water vapor amount to aerosol concentration. Under polluted conditions the rain is suppressed and the total amount of water vapor in the atmosphere increases with time compared to clean precipitating conditions. Theoretical examination of this aerosol effect on water vapor transport from the subtropics to the tropics, and hence on the equatorial rain and Hadley circulation, is conducted using an idealized general circulation model (GCM). It is shown that a reduction in the subtropical rain amount results in increased water vapor advection to the tropics and enhanced equatorial rain and Hadley circulation. This joins previously proposed mechanisms on the radiative aerosol effect on the general circulation.

Original languageAmerican English
Pages (from-to)11,048-11,056
JournalGeophysical Research Letters
Volume43
Issue number20
DOIs
StatePublished - 28 Oct 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
©2016. American Geophysical Union. All Rights Reserved.

Keywords

  • aerosol
  • clouds
  • rain
  • tropical circulation

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