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Doppler Lidar Observations of Nocturnal Flows from a Tributary Valley near Vancouver, B.C.
R. M. Banta,
P. B. Shepson (Purdue University),
J. W. Bottenheim (Atmospheric Environment Service) and
K. G. Anlauf (AES)
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During the fair weather conditions that lead to photochemical pollution episodes
in Vancouver, B.C., and the nearby Lower Fraser River Valley (LFV), thermally
forced daytime upvalley flows carry pollutants northward into the many tributary
valleys. These "finger-lake" valleys cut through the mountain range to the north of
the LFV
(see map, Fig. 1).
At night thermally forced downvalley flows carry the
polluted air out of the valleys and back into the LFV. Here, we study the chemistry
and meteorological characteristics of the nocturnal flow out of one of the major
tributary valleys, the valley of Pitt Lake, to investigate changes in the air mass
occurring in the tributary valley. This material was condensed from a more
detailed study by Banta et al. (1997).
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ETL /
Review /
Doppler Lidar Observations of Nocturnal Flows from a Tributary Valley near Vancouver, B.C.
/ Figure:
Introduction,
1,
2,
3,
4,
5,
6,
7,
Findings
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