Cloud collection principles are briefly reviewed; the performance of two collectors in common use is compared. Two cloud event studies (one during winter, the other during summer) are presented to contrast typical time-dependent histories of chemical concentrations for the two seasons. During winter, the oxidation rate of SO(2) is low, resulting in measured sulfate concentrations independent of SO(2) concentrations. During summer, SO(2) is rapidly oxidized by H(2)O(2) with a residue of H(2)O(2) persisting in cloud water after SO(2) has been converted. Changes in the gas phase concentrations of SO(2) and H(2)O(2) are shown during a cloud event. Both gases drop to very low concentrations in cloud with H(2)O(2) tending to recover after available SO(2) has been oxidized. The meteorology for each event is presented to illustrate the role of atmospheric structure in the transporting of emitted material and in determining cloud water compositions. Finally, a cloud chemistry climatology for winter and summer is presented, based upon 6 years of observations at Whiteface Mountain.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTField intercomparison of five types of fog water collectorsSusanne V. Hering, Donald L. Blumenthal, Robert L. Brewer, Alan. Gertler, Michael. Hoffmann, John A. Kadlecek, and Keith. PettusCite this: Environ. Sci. Technol. 1987, 21, 7, 654–663Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July 1987https://pubs.acs.org/doi/10.1021/es00161a006https://doi.org/10.1021/es00161a006research-articleACS PublicationsRequest reuse permissionsArticle Views205Altmetric-Citations42LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

MAP3S data for 1977–1979 are utilized to examine temporal, spatial and directional variability of wet deposition of the dominant ions in precipitation for selected sites in the northeastern United States. Linear regression analysis applied to 3-y cumulative totals is found to be applicable and provide a reasonable wet deposition predictive capability. Trajectory analysis is also applied to the data set for two stations to determine the percentage of total wet deposition associated with various approach sectors. Spatial variability in wet deposition is examined by normalizing deposition totals. No steep gradients in the normalized wet deposition of pollutant-related ions were found throughout the area of study.