AN ANALYSIS OF THE FILTER DIFFUSION CHAMBER AND DROP FREEZING METHODS OF DETERMINING ICE NUCLEUS CONCENTRATIONS

Wang Mingkang

doi:10.1007/BF03179758

Impact Factor: 5.8

Volume 2 Issue 2

Apr. 1985

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Article > ADVANCES IN ATMOSPHERIC SCIENCES > 1985 > 2(2): 260-269

AN ANALYSIS OF THE FILTER DIFFUSION CHAMBER AND DROP FREEZING METHODS OF DETERMINING ICE NUCLEUS CONCENTRATIONS

Wang Mingkang

1.
Department of Meteorology, Nanjing University, Nanjing

Wang Mingkang

doi: 10.1007/BF03179758

Abstract
References
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Abstract:
The membrane filters used for sampling at a height of 60 m and at ground level were processed with a drop freezing technique and a static vapor-diffusion chamber. Comparisons of IN concentrations obtained by the two techniques are made. The blank filter counts and ice nucleus measurement reproducibility are analysed. The factors affecting IN concentration measurements are discussed and some favorable operation conditions are suggested. It has been found that: (a) the IN concentrations typically range from 0.2 L-1 to 2.0 L-1 at -20oC, (b) significant time variations in IN concentrations occurs, (c) the IN concentra-tions obtained by the drop freezing technique typically exceed the value given by the diffusion chamber, (d) their variation trends are generally in phase, (e) high IN concentrations are often associated with pre-cipitation events.
References

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Manuscript History

Manuscript received: 10 April 1985

Manuscript revised: 10 April 1985

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

AN ANALYSIS OF THE FILTER DIFFUSION CHAMBER AND DROP FREEZING METHODS OF DETERMINING ICE NUCLEUS CONCENTRATIONS

Wang Mingkang

1. Department of Meteorology, Nanjing University, Nanjing

Manuscript received: 1985-04-10
Manuscript revised: 1985-04-10

Abstract: The membrane filters used for sampling at a height of 60 m and at ground level were processed with a drop freezing technique and a static vapor-diffusion chamber. Comparisons of IN concentrations obtained by the two techniques are made. The blank filter counts and ice nucleus measurement reproducibility are analysed. The factors affecting IN concentration measurements are discussed and some favorable operation conditions are suggested. It has been found that: (a) the IN concentrations typically range from 0.2 L-1 to 2.0 L-1 at -20oC, (b) significant time variations in IN concentrations occurs, (c) the IN concentra-tions obtained by the drop freezing technique typically exceed the value given by the diffusion chamber, (d) their variation trends are generally in phase, (e) high IN concentrations are often associated with pre-cipitation events.