• Cameron, D. C., 1931: Easterly gales in the Columbia River gorge during the winter of 1930–1931—Some of their causes and effects. Mon. Wea. Rev., 59 , 411413.

    • Search Google Scholar
    • Export Citation
  • Emery, C., E. Tai, U. Nopmongcol, J. Johnson, and R. Morris, 2007: Modeling analyses conducted for the Columbia River Gorge Air Quality Study. Final Rep., Southwest Clean Air Agency, Vancouver, WA, 310 pp. [Available online at http://www.swcleanair.org/gorgedata/Columbia_River_Gorge_ Modeling_Final_Report_082807.pdf.].

  • Green, M., and J. Xu, 2007: Causes of haze in the Columbia River gorge. J. Air Waste Manage. Assoc., 57 , 947958.

  • Green, M., N. Adhikari, J. Xu, and G. Nikolich, 2006a: Columbia River gorge haze gradient study. Columbia River Gorge Air Quality Rep., Southwest Clean Air Agency, Vancouver, WA, 57 pp. [Available online at http://www.swcleanair.org/reports. html.].

  • Green, M., J. Xu, N. Adhikari, and G. Nikolich, 2006b: Causes of haze in the gorge (CoHaGo). Columbia River Gorge Air Quality Rep., Southwest Clean Air Agency, Vancouver, WA, 106 pp. [Available online at http://www.swcleanair.org/reports.html.].

  • Reed, T. R., 1931: Gap winds of the Strait of Juan de Fuca. Mon. Wea. Rev., 59 , 373376.

  • Sharp, J., 2002: Columbia gorge gap flow: Insights from observational analysis and ultra-high-resolution simulation. Bull. Amer. Meteor. Soc., 83 , 17571762.

    • Search Google Scholar
    • Export Citation
  • Sharp, J., and C. F. Mass, 2004: Columbia gorge gap winds: Their climatological influence and synoptic evolution. Wea. Forecasting, 19 , 970992.

    • Search Google Scholar
    • Export Citation
  • Whiteman, C. D., S. Zhong, W. J. Shaw, J. M. Hubbe, X. Bian, and J. Mittelstadt, 2001: Cold pools in the Columbia Basin. Wea. Forecasting, 16 , 432447.

    • Search Google Scholar
    • Export Citation
  • Zhong, S., C. D. Whiteman, X. Bian, W. J. Shaw, and J. M. Hubbe, 2001: Meteorological processes affecting the evolution of a wintertime cold air pool in the Columbia Basin. Mon. Wea. Rev., 129 , 26002613.

    • Search Google Scholar
    • Export Citation
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 5 5 5
PDF Downloads 0 0 0

Transport of Atmospheric Aerosol by Gap Winds in the Columbia River Gorge

View More View Less
  • 1 Desert Research Institute, Las Vegas, Nevada
Restricted access

Abstract

Typical diurnal wind patterns and their relationship to transport of atmospheric aerosol in the Columbia River gorge of Oregon and Washington are addressed in this paper. The measurement program included measurements of light scattering by particles (bsp) with nephelometers, and wind speed and direction, temperature, and relative humidity at seven locations in the gorge. Winds are shown to respond to along-gorge pressure gradients, and five common patterns were identified: strong, moderate, and light westerly (west to east), light easterly, and winter easterly. The strong westerly and winter easterly patterns were the most common summer and winter patterns, respectively, and represented strong gap flow. The light westerly and light easterly patterns occurred most frequently in spring and autumn transition periods. Winter easterly had the highest light scattering and indicated sources east of the gorge mainly responsible for haze. During summer, as westerly winds increased diurnally, a pulse of hazy air from the Portland, Oregon, metropolitan area is transported eastward into the gorge, arriving later with distance into the gorge. During light easterly flow impacts to haze from the city of The Dalles, Oregon, are noted as the wind shifts direction diurnally.

Corresponding author address: Mark Green, Desert Research Institute, 755 E. Flamingo Road, Las Vegas, NV 89119. Email: green@dri.edu

Abstract

Typical diurnal wind patterns and their relationship to transport of atmospheric aerosol in the Columbia River gorge of Oregon and Washington are addressed in this paper. The measurement program included measurements of light scattering by particles (bsp) with nephelometers, and wind speed and direction, temperature, and relative humidity at seven locations in the gorge. Winds are shown to respond to along-gorge pressure gradients, and five common patterns were identified: strong, moderate, and light westerly (west to east), light easterly, and winter easterly. The strong westerly and winter easterly patterns were the most common summer and winter patterns, respectively, and represented strong gap flow. The light westerly and light easterly patterns occurred most frequently in spring and autumn transition periods. Winter easterly had the highest light scattering and indicated sources east of the gorge mainly responsible for haze. During summer, as westerly winds increased diurnally, a pulse of hazy air from the Portland, Oregon, metropolitan area is transported eastward into the gorge, arriving later with distance into the gorge. During light easterly flow impacts to haze from the city of The Dalles, Oregon, are noted as the wind shifts direction diurnally.

Corresponding author address: Mark Green, Desert Research Institute, 755 E. Flamingo Road, Las Vegas, NV 89119. Email: green@dri.edu

Save