Skip to Main Content
The Effect of Lake Temperatures and Emissions on Ozone Exposure in the Western Great Lakes RegionAuthor(s): Jerome D. Fast; Warren E. Heilman
Source: Journal of Applied Meteorology 42: 1197-1217
Publication Series: Scientific Journal (JRNL)
Station: North Central Research Station
PDF: Download Publication (3.02 MB)
DescriptionA meteorological-chemical model with a 12-km horizontal grid spacing was used to simulate the evolution of ozone over the western Great Lakes region during a 30-day period in the summer of 1999. Lake temperatures in the model were based on analyses derived from daily satellite measurements. The model performance was evaluated using operational surface and upper-air meteorological measurements and surface chemical measurements. Reasonable agreement between the simulations and observations was obtained. The bias (predicted - observed) over the simulation period was only - 1.3 ppb for the peak ozone mixing ratio during the day and 5.5 ppb for the minimum ozone mixing ratio at night. High ozone production rates were produced over the surface of the lakes as a result of stable atmospheric conditions that trapped ozone precursors within a shallow layer during the day. In one location, an increase of 200 ppb of ozone over a 9-h period was produced by chemical production that was offset by losses of 110 ppb through vertical mixing, horizontal transport, and deposition. The predicted ozone was also sensitive to lake temperatures. A simulation with climatological lake temperatures produced ozone mixing ratios over the lakes and around the lake shores that differed from the simulation with observed lake temperatures by as much as 50 ppb, while the differences over land were usually 10 ppb or less. Through a series of sensitivity studies that varied ozone precursor emissions, it was shown that a reduction of 50% in NOx or volatile organic compounds would lower the 60-ppb ozone exposure by up to 50 h month-1 in the remote forest regions over the northern Great Lakes. The implications of these results on future climate change and air quality in the region are discussed.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, firstname.lastname@example.org if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationFast, Jerome D.; Heilman, Warren E. 2003. The Effect of Lake Temperatures and Emissions on Ozone Exposure in the Western Great Lakes Region. Journal of Applied Meteorology 42: 1197-1217
- Simulated sensitivity of seasonal ozone exposure in the Great Lakes region to changes in anthropogenic emissions in the presence of interannual variability
- Effect of regional-scale transport on oxidants in the vicinity of Philadelphia during the 1999 NE-OPS field campaign
- Surface ozone in the Lake Tahoe Basin
XML: View XML