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| Titel |
Aerosols that form subvisible cirrus at the tropical tropopause |
| VerfasserIn |
K. D. Froyd, D. M. Murphy, P. Lawson, D. Baumgardner, R. L. Herman |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 1 ; Nr. 10, no. 1 (2010-01-12), S.209-218 |
| Datensatznummer |
250007901
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| Publikation (Nr.) |
 copernicus.org/acp-10-209-2010.pdf |
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| Zusammenfassung |
| 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. |
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