Haze in the Grand Canyon: An Evaluation of the Winter Haze by National Research Council, Division on Earth and Life

By National Research Council, Division on Earth and Life Studies, Environment and Resources Commission on Geosciences, Board on Atmospheric Sciences and Climate, Board on Environmental Studies and Toxicology, Committee on Haze in National Parks and Wildernes

The Grand Canyon is likely one of the such a lot extraordinary typical attractions in the world. nearly four million viewers trip to Grand Canyon nationwide Park (GCNP) every year to take pleasure in its majestic geological formations and very coloured perspectives. even though, visibility in GCNP could be impaired via small raises in concentrations of excellent suspended debris that scatter and soak up mild; the ensuing visibility degradation is perceived as haze. Sulfate debris are a significant component in visibility impairment at Grand Canyon in summer time and wintry weather. Many wintertime hazes at GCNP are believed to outcome from the buildup of emissions from neighborhood resources in the course of stipulations of air stagnation, which happen extra usually in iciness than in summer season. In January and February 1987, the nationwide Park provider (NPS) conducted a large-scale test often called the iciness Haze extensive Tracer test (WHITEX) to enquire the reasons of wintertime haze within the quarter of GCNP and Canyonlands nationwide Park. the general goal of WHITEX was once to evaluate the feasibility of attributing visibility impairment in particular geographic areas to emissions from a unmarried element resource. The test referred to as for the injection of a tracer, deuterated methane (CD₄), into one of many stacks of the Navajo producing Station (NGS), an important coal-fired strength plant positioned 25 km from the GCNP boundary and a hundred and ten km northeast of Grand Canyon Village. A community of box stations used to be confirmed within the area -- generally to the northeast of GCNP and NGS -- to degree CD₄ concentrations, atmospheric aerosol and optical houses, and different chemical and actual attributes. 19 refs., three figs.

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Extra resources for Haze in the Grand Canyon: An Evaluation of the Winter Haze Intensive Tracer Experiment

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Variable selection was critical to the interpretation of the results, . Indeed, NPS because CD4 is clearly not the only tracer correlating with GCNP variance can be noted in its reply to SRP's comments that two-thirds of the accounted for by RH and As alone. To establish a more rational basis for quantitative attribution, more attention must be given to alternative formulations for TMBR and DMB and to criteria for selecting among them. However, even if these criteria were adequately considered, the statistical results would most likely remain non-robust in the sense that the source attributions generated by the various statistical models would probably still differ substantially from one another.

1987. Hydrogen peroxide in air during winter over the south-central United States. Geo-phys. Res. Lett. 14:1146-1149. C. Malm. 1979. The excellent but deteriorating air quality in the Lake Powell region. APCA Journal 29(4):378-380. About this PDF file: This new digital representation of the original work has been recomposed from XML files created from the original paper book, not from the original typesetting files. Page breaks are true to the original; line lengths, word breaks, heading styles, and other typesetting-specific formatting, however, cannot be retained, and some typographic errors may have been accidentally inserted.

45 mg S/m3 early February 10 (Fig. 05 mg S/m3 (Appendix 2, pp. 76, 77, 85 (eq. 6-10)). Samples collected at Green River, Canyonlands, and Bullfrog during this period were not analyzed for CD4. The NPS-WHITEX report did not attempt to quantify the effects on its analyses of departures from the statistical assumptions that it identified. However, the potential magnitude of such effects is substantial. Unfortunately, the WHITEX design did not provide the data needed for a definitive resolution of this issue.

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