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Title:The chemistry of precipitation for the island of Hawaii during the HAMEC Project.
Author(s):Miller, John M.; Stensland, Gary J.; Semonin, Richard G.
Subject(s):Hawaii Mesoscale Energy and Climate Project (HAMEC)
Precipitation chemistry
pH measurement
Geographic Coverage:Hawaii
Abstract:During the Hawaii Mesoscale Energy and Climate Project (HAMEC), a program of precipitation chemistry measurements was conducted using daily and sequential collection techniques. Determination of pH and conductivity were made on site for the daily samples, and all samples were shipped to the Illinois State Water Survey for analysis of major ions. During the period of study,June 11-24, 1980, over 300 sequential rain samples were collected at the Hilo site. The acidity of these samples was very similar to the 5-year acidity distribution of Hilo with a median pH of 4.7. Enrichment calculations showed that the chloride and magnesium levels were consistent with seawater ratios; potassium and calcium levels were 20%-40% greater and sulfate was more than 100% in excess of levels expected from seawater ratios. The daily samples collected at nine sites from Hilo (60 m) to Mauna Loa Observatory (3400 m) showed a steady decrease in seasalt constituents with elevation. The acidity also decreased with elevation, a condition that did not follow the increase with elevation measured over the previous 5-year sampling program. It was also found that nitrate decreased less rapidly with elevation than did excess sulfate. Implications of these HAMEC results are interpreted in terms of long-range transport. Differences in field and laboratory pH measurements are explained as an indication of unmeasured inorganic acids. At the time of the field pH measurements (within 24 hours of the rainfall) the organic acids were calculated to contribute hydrogen ion concentrations that were from 35% to 282% of the levels from strong mineral acids.
Issue Date:1984-11
Publisher:National Oceanic and Atmospheric Administration (NOAA) Environmental Research Laboratories
Series/Report:NOAA Technical Memorandum ERL ARL no. 133
ISWS Contract Report CR 361
Genre:Technical Report
Description:The 1995 ISWS Publications Catalog entry for ISWS CR 361 lists this work. The CR series statement has been added to this record on the basis of this information even though there is no reference to the ISWS series in the work itself.
Rights Information:Public domain, federal government document.
Date Available in IDEALS:2021-05-12
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