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- W18973399 abstract "Measurements of condensation nuclei (CN) in and near cirrus were carried out on the NASA DC-8, as part of the TOGA-COARE mission from January–February 1993. Flights at temperatures between -35° C and -55° C in cirrus anvils from tropical convection in the western Pacific Ocean showed the irregular occurrence of high concentrations up to 8000 cm-3, compared to the background of 200 cm-3. These particles could be removed by heating, with significant depletion at temperatures above 120° C, suggesting a sulfuric acid component of the aerosol. Further heating beyond 200° C caused a further reduction, suggesting ammonium sulfate and/or ammonium bisulfate. Results from specific penetrations show considerable variability in composition between sulfuric acid and ammonium sulfate. Simultaneous measurements of ice particles show concentrations in excess of 1 cm-3, well below the concentration of CN. Thus significant concentrations of haze particles as high concentration solute, both super cooled and supersaturated may be present, the larger particles acting as cloud condensation nuclei (CCN). A simple model describes the mechanisms of cirrus formation and the importance of CCN in leading to the ice formation process, and the implications of changing aerosol type and concentration on cirrus optical properties" @default.
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- W18973399 date "1996-01-01" @default.
- W18973399 modified "2023-09-26" @default.
- W18973399 title "Aerosol in tropical cirrus" @default.
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- W18973399 doi "https://doi.org/10.1016/b978-008042030-1/50215-8" @default.
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