Ozone deposition in a subalpine Rocky Mountain forest
- Forest Service, Fort Collins, CO (United States)
USDA Forest Service O{sub 3} and meteorological data were collected at the Brooklyn Lake tower site situated in a small spruce-fir forest opening located within the Glacier Lakes Ecosystem Experiment Site (GLEES) area. Diurnal O{sub 3} concentration cycles are influenced by O{sub 3} deposition. Ozone concentrations and O{sub 3} deposition appear to be affected by interactions between the forest canopy, solar radiation, temperature, wind turbulence, and air moisture. Late summertime changes in the surface layer O{sub 3} within and above the forest canopy demonstrated by measurements taken in the GLEES subalpine ecosystem are presented in this paper. Hourly O{sub 3} concentrations at GLEES average from 45 to 60 ppb year round, and are typical of clean high elevation rural sites. Above-canopy diurnal O{sub 3} concentrations at this location do not exhibit the large day/night maximum/minimum pattern typical of urban, photochemically dominated air masses at any time during the year. However, below-canopy, summertime O{sub 3} concentrations do have a predominant day/night pattern: maximum O{sub 3} values are no higher than those above canopy but, minimum values can drop by 40 ppb at night. Daytime O{sub 3} concentrations are horizontally uniform in the surrounding area: O{sub 3} concentrations at 10m height in an open area near Centennial, Wy, 8 km southeast, during 1990 were within a few ppb of those measured below the canopy at 3m at the GLEES.
- OSTI ID:
- 422896
- Report Number(s):
- CONF-960127-; TRN: IM9707%%203
- Resource Relation:
- Conference: 9. joint American Meteorological Society/Air and Waste Management Association conference on applications of air pollution meteorology, Atlanta, GA (United States), 28 Jan - 2 Feb 1996; Other Information: PBD: [1996]; Related Information: Is Part Of Ninth joint conference on applications of air pollution meteorology with A and WMA; PB: 672 p.
- Country of Publication:
- United States
- Language:
- English
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