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Published 1990 | public
Journal Article

A comparison of two cloudwater/fogwater collectors: The rotating arm collector and the caltech active strand cloudwater collector


A side-by-side comparison of the Rotating Arm Collector (RAC) and the Caltech Active Strand Cloudwater Collector (CASCC) was conducted at an elevated coastal site near the eastern end of the Santa Barbara Channel in southern California. The CASCC was observed to collect cloudwater at rates of up to 8.5 ml min^(−1). The ratio of cloudwater collection rates was found to be close to the theoretical prediction of 4.2:1 (CASCC:RAC) over a wide range of liquid water contents (LWC). At low LWC, however, this ratio climbed rapidly, possibly reflecting a predominance of small droplets under these conditions, coupled with a greater collection efficiency of small droplets by the CASCC. Cloudwater samples collected by the RAC had significantly higher concentrations of Na^+, Ca^(2+), Mg^(2+) and Cl^− than those collected by the CASCC. These higher concentrations may be due to differences in the chemical composition of large vs small droplets. No significant differences were observed in concentrations of NO_3^−, SO_4^(2−) or NH_4^+ in samples collected by the two instruments.

Additional Information

© 1990 Elsevier. First received 17 November 1988 and in final form 31 October 1989. We gratefully acknowledge the assistance and cooperation of the United States Navy Pacific Missile Test Center at Point Mugu, the Federal Aviation Administration, and the California Air Resources Board for providing access to the sampling site. This research was supported by the California Air Resources Board (CARB contract # A4-075-32).

Additional details

August 19, 2023
October 23, 2023