Publikationen
>> interne Seiten (SSL)
|
Klemm, O; Wrzesinsky, T; Gerchau, J; Griessbaum, F: A Collector for Fog Water and Interstitial Aerosol, Journal of Atmospheric and Oceanic Technology, 25, 335-340 (2007) | |
Abstract: An active heatable cloud water collector for ground sampling is presented. The collector can be operated
unattended for approximately one week, even in harsh winter conditions. The collection strands are Teflon
tubes. A preset cycle of 15-min sampling followed by 250 s of mild heating using wires inserted into the tubes
is used. The lower cutoff diameter for fog droplets is 7.3 m, and its overall collection efficiency is 79% for
the liquid water content of fogs at the experimental site in central Europe. It performed reliably during a
2-yr experiment. The collected fog water interacts exclusively with inert materials such as Teflon and
Perspex so the collector is well suited for trace analyses of fog water. The collector can be upgraded with
an interstitial aerosol collection unit, at the expense of unattended operation. The lower cutoff diameter of
the fog water collection strands is 8.1 m when the interstitial aerosol module is installed. The module
efficiently collects particles with diameters 3.5 m. For these particles, size-segregated samples in four size
classes at diameters down to 0.06 m are collected with a Berner-type impactor. The collector was successfully
employed in a mountainous region of central Europe. Over 400 samples were collected within 2
yr. With the collection unit for interstitial aerosol added, 31 samples were collected in a 2-month period. |
Siehe auch:
|