00000nam 2200000zi 4500 9.911878 CaOODSP 20241127112630 m o d f cr bn||||||||| 220517e199304##oncbd ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn-bc En57-51/93-002E-PDF Martin, J. B., author. Lower Fraser Valley study, July 28-August 28, 1992 / by J.B. Martin and F.A. Froude, Centre for Atmospheric Research Experiments and B. Thomson and C. Evans, Atmospheric Issues and Services Branch, Pacific Region. Egbert, Ontario : Centre for Atmospheric Research Experiments, Air Quality Research Branch, Atmospheric Environment Service ; Vancouver, B.C. : Centre for Atmospheric Research Experiments, Atmospheric Issues and Services Branch, April 1993. 1 online resource (i, 14 pages, 68 unnumbered pages) : maps, graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier ARD report ; 93-002 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (page 14). "In the summer of 1992, a study was initiated in the Lower Fraser Valley of British Columbia to gather information relevant to the occurrence of photochemical smog. Two episodes were observed, one on July 31 and another in the period of August 12-13. Atmospheric profiles of tropospheric ozone, temperature, humidity and winds collected at frequent intervals during daytime are presented as well as contours of surface ozone concentrations. At the Clearbrook B.C. sampling site, the highest observed concentration of ozone was 65 ppb, however the Greater Vancouver Regional District monitoring station at Chilliwak B.C. recorded an hourly average of 81 ppb on August 13th 1992. Contour plots of hourly averages of ozone indicate that ozone generated in the urban core is transported up the valley throughout the day. Vertical profiles show that erosion of the ozone aloft is tied in to southwesterly flows, suggesting that perhaps some NOx/03 chemistry is also occurring"--Abstract, page i. Ozone layer British Columbia Fraser River Valley. Photochemical smog British Columbia Fraser River Valley. Couche d'ozone Colombie-Britannique Fraser, Vallée du. Smog photochimique Colombie-Britannique Fraser, Vallée du. Canada. Atmospheric Environment Service, issuing body. PDF 3.26 MB https://publications.gc.ca/collections/collection_2022/eccc/En57-51-93-002-eng.pdf