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)

Findings

Nighttime outflow from Pitt Lake valley cleansed of O3, aerosols, and several other pollutants.
Outflow jet not uniform across valley cross section: much variability in fixed-sensor measurements attributable to meander of this jet.
Declines in ozone concentration:
1-2 August: fresh pollution implies titration with NO a factor; Ox also declines, indicating dry deposition

4-5 August: air with aged pollution, O3 and Ox decline together, implies dry deposition major removal process.

2-3, 3-4 August: more complicated - much of observed variability probably due to meander of outflow jet.

Dry deposition most likely occurs in downslope flows along forested sidewalls of Pitt Lake valley.
Interpretation of chemistry and meteorology data interdependent.
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