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Temporal and vertical distribution of acidity and ionic composition in clouds - Comparison between modeling results and observationsCyclic temporal variations of pH and ionic concentration in sampled clouds which traversed the Mt. Mitchell State Park (North Carolina) site during the summers of 1986, 1987, and 1988 are reported. These clouds typically had a measured pH minimum during their initial and final stages. The cause of this basic cylic pattern is attributed to sampling at different vertical levels of the cloud. This is substantiated by visual observations made while sampling. The results also suggest that the measured pH patterns do not always exhibit minima during the formative and dissipative stages of the cloud, apparently in response to the underlying dynamical processes. The relationship between temporal pH measurements made at a stationary site to vertical cloud levels provides insights into the physical processes (e.g., nucleation scavenging near cloud base, dry air entrainment near cloud top) influencing the observed cloud-water chemistry on a real-time basis and would improve cloud chemistry models.
Document ID
19900051311
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Defelice, T. P.
(NASA Ames Research Center Moffett Field, CA; North Carolina State University, Raleigh, United States)
Saxena, V. K.
(North Carolina State University Raleigh, United States)
Date Acquired
August 14, 2013
Publication Date
May 1, 1990
Publication Information
Publication: Journal of the Atmospheric Sciences
Volume: 47
ISSN: 0022-4928
Subject Category
Meteorology And Climatology
Accession Number
90A38366
Funding Number(s)
CONTRACT_GRANT: EPA-812444-03-0
CONTRACT_GRANT: EPA-CR-812444-01-0
CONTRACT_GRANT: EPA-CR-812444-02-0
Distribution Limits
Public
Copyright
Other

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