Application of disperion models for layered haze source apportionment

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6958963

Latimer, D A ^[1]

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1. Gaia Associates, San Rafael, CA (USA)

The phenomenon of layered haze, forms of visibility impairment, is of concern to the National Park Service, presumably because it may adversely affect the visual experience of visitors to national parks and wilderness areas.Because layered haze has been observed principally in the winter at locations such as Bryce Canyon and Mesa Verde national parks, which are adjacent to large , coal-fired power plants, it ahs been speculated that these plants may be large contributors to such haze. Although special studies have been carried out during the past two winters (1985-6 and 1986-87) specifically to study layered haze near Bryce Canyon, conclusive results as to the cause of and principal source contributors to wintertime layered haze have not yet been obtained. A critical question that remains to be answered regarding this wintertime layered haze is the relative contribution of the local power plant (Navajo) and other emissions from the populated areas (e.g. from coal- and wood-fired space heaters in the town of Page and on the Navajo and Hopi Indian Reservations) compared to other more distant sources located throughout the Southwest. The authors discuss two different models designed in an attempt to place bounds in the relative impact of the Navajo Generating Station, based on different assumptions, to address the relative impact of the Navajo plant on winter layered haze. These calculations can only be considered bounding calculations at this time because of the significant uncertainties in atmospheric flow and dispersion conditions and plume chemistry; however, they may be useful in interpreting the results of on-going studies if the layered haze phenomenon.

• OSTI ID: 6958963
• Report Number(s): CONF-880679--
• Country of Publication: United States
• Language: English

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