Sample collector, clouds

Cloud Water and Precipitation Collectors. Several methods have been developed for collecting cloud water samples (24-26). Probably the device most commonly used in warm clouds is the slotted rod collector developed by the Atmospheric Science Research Center at the State University of New York (SUNY) at Albany. Commonly known as the ASRC collector (25), this collector consists of an array of rods constructed from Delrin (a form of nylon). Each rod is hollow and has a slot located at its forward stagnation line. The rod radius determines the collection efficiency as a function of particle size, the rods are sized to collect cloud droplets but not submicrometer aerosol particles, and the 50% cutoff is calculated to be at about 3 xm. 

A cloud water collector that separates unactivated (interstitial) particles from cloud droplets by jet impaction of these droplets on inert surfaces (12) provides a sample for chemical analyses. 

This paper is a summary of our findings from a four-year study of the chemical composition of fog and cloud water in California. Fog water was sampled at a number of sites with a rotating arm collector, which was developed in our laboratory and collects representative samples. Field investigations in the Los Angeles basin, the San Gabriel Mountains, and the San Joaquin Valley revealed very high ionic... 

In June of 1983, five different types of fog/cloud water collectors were compared under field conditions at Henninger Flats. Collectors designed by AeroVironment(AV), Caltech(CIT), the Desert Research Institute(DRI), Global Geochemistry(GGC), and the State University of New York(SUNY)-Albany were tested against one another. The mass and pH of the samples collected were measured on site while the detailed chemical analyses were performed by an independent laboratory, Rockwell International. Results of the intercomparison study, sponsored the the Coordinating Research Council, showed that the Caltech and DRI collectors performed the best over the broadest range of conditions At low liquid water content (i.e. LWC <... 

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