Abstract
Strong contrasts in daytime mixing height (boundary layer [BL] height or zi) between urban and rural areas were observed during the 1999 Nashville Summer Intensive field campaign of the Southern Oxidants Study. On occasion, the urban mixing height was as much as 45% (700 m) higher than that over the rural areas. The difference was quite persistent, showing strongly in statistical comparisons, with a mean difference over all hours available for comparison of 160 m. Clouds had higher bases and were more common over the urban area as well. In this paper, measurements from wind profiling radars, lidars, and aircraft are used to characterize mixing height and clouds. The urban-rural contrasts have important implications for regional air quality. The mixing height is a first-order control on pollutant concentrations. The urban-rural contrast also results in the venting of urban pollutants, affecting the local concentrations and the regional background. Clouds affect air quality by changing the radiative input for photochemistry and through changes in mixing and venting.
| Original language | English |
|---|---|
| Journal | Journal of Geophysical Research D: Atmospheres |
| Volume | 108 |
| Issue number | 3 |
| Publication status | Published - 16 Feb 2003 |
| Externally published | Yes |
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Keywords
- Air quality
- Boundary layer
- Lidar
- Mixing depth
- Radar wind profiler
- Southern oxidant study
- Urban heat island
ASJC Scopus subject areas
- Earth and Planetary Sciences (miscellaneous)
- Atmospheric Science
- Geochemistry and Petrology
- Geophysics
- Oceanography
- Space and Planetary Science
- Astronomy and Astrophysics
Cite this
Urban-rural contrasts in mixing height and cloudiness over Nashville in 1999. / Angevine, Wayne M.; White, Allan B.; Senff, Christoph J.; Trainer, Michael; Banta, Robert M.; Ayoub, Mohammed.
In: Journal of Geophysical Research D: Atmospheres, Vol. 108, No. 3, 16.02.2003.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Urban-rural contrasts in mixing height and cloudiness over Nashville in 1999
AU - Angevine, Wayne M.
AU - White, Allan B.
AU - Senff, Christoph J.
AU - Trainer, Michael
AU - Banta, Robert M.
AU - Ayoub, Mohammed
PY - 2003/2/16
Y1 - 2003/2/16
N2 - Strong contrasts in daytime mixing height (boundary layer [BL] height or zi) between urban and rural areas were observed during the 1999 Nashville Summer Intensive field campaign of the Southern Oxidants Study. On occasion, the urban mixing height was as much as 45% (700 m) higher than that over the rural areas. The difference was quite persistent, showing strongly in statistical comparisons, with a mean difference over all hours available for comparison of 160 m. Clouds had higher bases and were more common over the urban area as well. In this paper, measurements from wind profiling radars, lidars, and aircraft are used to characterize mixing height and clouds. The urban-rural contrasts have important implications for regional air quality. The mixing height is a first-order control on pollutant concentrations. The urban-rural contrast also results in the venting of urban pollutants, affecting the local concentrations and the regional background. Clouds affect air quality by changing the radiative input for photochemistry and through changes in mixing and venting.
AB - Strong contrasts in daytime mixing height (boundary layer [BL] height or zi) between urban and rural areas were observed during the 1999 Nashville Summer Intensive field campaign of the Southern Oxidants Study. On occasion, the urban mixing height was as much as 45% (700 m) higher than that over the rural areas. The difference was quite persistent, showing strongly in statistical comparisons, with a mean difference over all hours available for comparison of 160 m. Clouds had higher bases and were more common over the urban area as well. In this paper, measurements from wind profiling radars, lidars, and aircraft are used to characterize mixing height and clouds. The urban-rural contrasts have important implications for regional air quality. The mixing height is a first-order control on pollutant concentrations. The urban-rural contrast also results in the venting of urban pollutants, affecting the local concentrations and the regional background. Clouds affect air quality by changing the radiative input for photochemistry and through changes in mixing and venting.
KW - Air quality
KW - Boundary layer
KW - Lidar
KW - Mixing depth
KW - Radar wind profiler
KW - Southern oxidant study
KW - Urban heat island
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UR - http://www.scopus.com/inward/citedby.url?scp=0141935012&partnerID=8YFLogxK
M3 - Article
VL - 108
JO - JAPCA
JF - JAPCA
SN - 1073-161X
IS - 3
ER -