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Atmospheric Ice Nucleators Active ≥ −12 °c Can Be Quantified on Pm10 Filters : Volume 5, Issue 2 (02/02/2012)

By Conen, F.

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Book Id: WPLBN0003993187
Format Type: PDF Article :
File Size: Pages 7
Reproduction Date: 2015

Title: Atmospheric Ice Nucleators Active ≥ −12 °c Can Be Quantified on Pm10 Filters : Volume 5, Issue 2 (02/02/2012)  
Author: Conen, F.
Volume: Vol. 5, Issue 2
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description
Description: Institute of Environmental Geosciences, University of Basel, 4056 Basel, Switzerland. Small number concentrations render it difficult to quantify ice nucleators (IN) in the atmosphere active at warm temperatures. A useful new method for IN measurement based around filter collections is proposed. It makes use of quartz filters used in 24 h PM10 monitoring (720 m3 air sample). Small subsamples (1.8 mm diameter) from the effective filter area and from the clean fringe (blank) are subjected to immersion freezing tests. We applied the method to eight filters from the High Alpine Research Station Jungfraujoch (3580 m above sea level) in the Swiss Alps. All filters carried IN active at −7 °C and below. Number concentrations of IN active at −8, −10, and −12 °C were on average 3.3, 10.7, and 17.2 m−3, respectively. Several-fold larger numbers of IN active at ≥ −12 °C per unit mass of PM10 were found in air masses influenced by Swiss and southern German atmospheric boundary layer air, compared to a Saharan dust event. In combination with data on PM10 mass, the method may be used to re-construct time series of IN number concentrations.

Summary
Atmospheric ice nucleators active ≥ −12 °C can be quantified on PM10 filters

Excerpt
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