Measurements of ice nuclei at high supersaturations

  • Rogers D
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Abstract

Airborne measurements in clouds at -10 to -30°C often show concentrations of ice crystals much greater than would be predicted from ice nuclei (IN) measurements made at or below 2% supersaturation with respect to liquid water (SSw). There may be small regions of such clouds where cloud droplets and CCN are removed by scavenging and precipitation processes, and large SSw (>10%) can develop. It has been speculated that in such regions, high concentrations of IN may activate, thereby explaining the high ice concentration. We explored this idea by obtaining a few measurements of natural IN with a continuous flow thermal gradient diffusion (CFD) chamber at high SSw, up to 40%. However, competition for vapor by activated and growing particles limit the supersaturation that can be achieved in this instrument. To examine this limit, numerical simulations and laboratory experiments were performed. [ABSTRACT FROM AUTHOR]; Copyright of AIP Conference Proceedings is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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APA

Rogers, D. C. (2003). Measurements of ice nuclei at high supersaturations (pp. 443–446). AIP Publishing. https://doi.org/10.1063/1.1361902

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