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Connecting hygroscopic growth at high humidities to cloud activation for different particle types

Wex, H.; Stratmann, F.; Hennig, T.; Hartmann, S.; Niedermeier, D.; Fors, Erik LU ; Ocskay, R.; Rose, D.; Salma, I. and Ziese, M. (2008) In Environmental Research Letters 3(3).
Abstract
This work recompiles studies that have been done with respect to hygroscopic growth in the regime of high relative humidities and with respect to activation for different kinds of particle at LACIS (Leipzig Aerosol Cloud Interaction Simulator) during the last few years. The particles examined consisted of a mixture of succinic acid and ammonium sulfate, seawater samples, soot coated with an organic and/or an inorganic substance, and two different atmospheric HULIS (HUmic LIke Substance) samples. An influence of changing non-ideal behavior and of slightly soluble substances on the hygroscopic growth was found in varying degrees in the subsaturation regime. The measured hygroscopic growth was extrapolated towards supersaturation, using a... (More)
This work recompiles studies that have been done with respect to hygroscopic growth in the regime of high relative humidities and with respect to activation for different kinds of particle at LACIS (Leipzig Aerosol Cloud Interaction Simulator) during the last few years. The particles examined consisted of a mixture of succinic acid and ammonium sulfate, seawater samples, soot coated with an organic and/or an inorganic substance, and two different atmospheric HULIS (HUmic LIke Substance) samples. An influence of changing non-ideal behavior and of slightly soluble substances on the hygroscopic growth was found in varying degrees in the subsaturation regime. The measured hygroscopic growth was extrapolated towards supersaturation, using a simple form of the Kohler equation, and assuming a constant number of molecules/ions in solution for high relative humidities (>= 95% or >= 98%, depending on the particles). When the surface tension of water was used, the modeled critical supersaturations reproduced the measured ones for the seawater samples and for the coated soot particles. To reach agreement between measured and modeled critical supersaturations for the HULIS particles, a concentration-dependent surface tension had to be used, with values of the surface tension that were lower than that of water, but larger than those that had been reported for bulk measurements in the past. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
surface tension, hygroscopic growth, activation, slight solubility, non-ideal behavior
in
Environmental Research Letters
volume
3
issue
3
publisher
IOP Publishing
external identifiers
  • wos:000259569300013
  • scopus:54749128205
ISSN
1748-9326
DOI
10.1088/1748-9326/3/3/035004
language
English
LU publication?
yes
id
1e9bc900-d36d-42e0-90b9-08f4fcf32bb5 (old id 1286755)
date added to LUP
2009-01-29 15:40:55
date last changed
2017-08-20 03:59:36
@article{1e9bc900-d36d-42e0-90b9-08f4fcf32bb5,
  abstract     = {This work recompiles studies that have been done with respect to hygroscopic growth in the regime of high relative humidities and with respect to activation for different kinds of particle at LACIS (Leipzig Aerosol Cloud Interaction Simulator) during the last few years. The particles examined consisted of a mixture of succinic acid and ammonium sulfate, seawater samples, soot coated with an organic and/or an inorganic substance, and two different atmospheric HULIS (HUmic LIke Substance) samples. An influence of changing non-ideal behavior and of slightly soluble substances on the hygroscopic growth was found in varying degrees in the subsaturation regime. The measured hygroscopic growth was extrapolated towards supersaturation, using a simple form of the Kohler equation, and assuming a constant number of molecules/ions in solution for high relative humidities (>= 95% or >= 98%, depending on the particles). When the surface tension of water was used, the modeled critical supersaturations reproduced the measured ones for the seawater samples and for the coated soot particles. To reach agreement between measured and modeled critical supersaturations for the HULIS particles, a concentration-dependent surface tension had to be used, with values of the surface tension that were lower than that of water, but larger than those that had been reported for bulk measurements in the past.},
  author       = {Wex, H. and Stratmann, F. and Hennig, T. and Hartmann, S. and Niedermeier, D. and Fors, Erik and Ocskay, R. and Rose, D. and Salma, I. and Ziese, M.},
  issn         = {1748-9326},
  keyword      = {surface tension,hygroscopic growth,activation,slight solubility,non-ideal behavior},
  language     = {eng},
  number       = {3},
  publisher    = {IOP Publishing},
  series       = {Environmental Research Letters},
  title        = {Connecting hygroscopic growth at high humidities to cloud activation for different particle types},
  url          = {http://dx.doi.org/10.1088/1748-9326/3/3/035004},
  volume       = {3},
  year         = {2008},
}