Sign up & Download
Sign in

Aerosols that form subvisible cirrus at the tropical tropopause

by K. D. Froyd, D. M. Murphy, P. Lawson, D. Baumgardner, R. L. Herman
Atmospheric Chemistry and Physics ()

Abstract

The composition of residual particles from evaporated cirrus ice crystals near the tropical tropopause as well as unfrozen aerosols were measured with a single particle mass spectrometer. Subvisible cirrus residuals were predominantly composed of internal mixtures of neutralized sulfate with organic material and were chemically indistinguishable from unfrozen sulfate-organic aerosols. Ice residuals were also similar in size to unfrozen aerosol. Heterogeneous ice nuclei such as mineral dust were not enhanced in these subvisible cirrus residuals. Biomass burning particles were depleted in the residuals. Cloud probe measurements showing low cirrus ice crystal number concentrations were inconsistent with conventional homogeneous freezing. Recent laboratory studies provide heterogeneous nucleation scenarios that may explain tropopause level subvisible cirrus formation.

Cite this document (BETA)

Readership Statistics

19 Readers on Mendeley
by Discipline
 
 
 
by Academic Status
 
32% Ph.D. Student
 
21% Post Doc
 
11% Associate Professor
by Country
 
11% United States
 
11% India
 
5% Australia

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Already have an account? Sign in