Haze in the Grand Canyon An Evaluation of the Winter Haze Intensive Tracer Experiment (1990) / Chapter Skim
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Executive Summary
Executive Summary
Pages 1-8
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A network of field stations was established in the vicinit~mostly to the northeast of GCNP and NGS—to measure CD4 concentrations, atmospheric aerosol and optical properties, and other chemical and physical attributes. During some haze episodes, significant concentrations of CD4 were detected at the Hopi Point sampling station on the south rim of the Grand Canyon
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and for assessing alternative source control measures and (2) to recommend strategies for improving scientific understanding and technical information on relative source contributions to haze formation, regional and seasonal factors affecting haze, relevant air quality models, and various emission control measures.
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The committee reviewed the December 1989 NPS-WHilEX report, other relevant published materials, and some unpublished information. In March 1990, the committee conducted site visits to the GCNP aunt NGS near Page, Arizona, and heard technical presentations from NPS, SRP, and their scientific consultants.
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The conceptual framework for DMB involved physically unrealistic simplifications, the effect of which on quantitative assessments was not addressed. The data base contained weaknesses; especially damaging were the absence of measurements below the rim of the Grand Canyon and the paucity of background measurements.
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Under these conditions, NGS emissions could produce SO4= concentrations similar to those measured In GCNP. However, the WHITEX data also show that there are important sulfur sources in addition to NGS that appear to contribute to regional background SO4= aerosol levels.
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Haze in the Grand Canyon An Evaluation of the Winter Haze Intensive Tracer Experiment
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