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Atmospheric EnvironmentVol. 24A, No. 3, pp.563 572, 1990. 0004 6981/90 $3.00+0.0( Printed in Great Britain Pergamon Press ph
 

Summary: Atmospheric EnvironmentVol. 24A, No. 3, pp.563 572, 1990. 0004 6981/90 $3.00+0.0(
Printed in Great Britain Pergamon Press ph
DYNAMIC CHEMICAL CHARACTERIZATION OF
MONTANE CLOUDS
VINEY P. ANEJA, CANDISS. CLA1BORNand RONALDL. BRADOW
Department of Marine, Earth and Atmospheric Sciences,North Carolina State University, Raleigh, NC
27695, U.S.A.
and
RICHARDJ. PAUR and RALPH E. BAUMGARDNER
Atmospheric Research and Exposure Assessment Laboratory, U.S. Environmental Protection Agency,
Research Triangle Park, NC 2771l, U.S.A.
(First received 6 March 1989and infinal form 25 July 1989)
Al~tract----Cloudwater collectionshave been made on Mt. Mitchell using a nearly real-timecloud and rain
acidity/conductivity (CRAC) analyzer. Results are reported for integrating times of approximately 5 min
during severalcloud events in the summer and fallof 1987.Both pH and ionic strength during cloud events
were found to be much more variable than previously indicated by integrated cloud collection. Maximum
values of H+ and SO~- ion concentrations in 5-minsamples wereas much as 2.5 times greater than those
measured in l-h integrated collections.These results are not influencedby instrumental variability to any
measurable extent. Resultsfrom repeated quality control samples werehighlyreproducible, and agreement
between integrated collection data and the average values of 5-minsequential samples was also very good.

  

Source: Aneja, Viney P. - Department of Marine, Earth and Atmospheric Sciences, North Carolina State University

 

Collections: Environmental Sciences and Ecology; Geosciences