Ozone, aerosol, potential vorticity, and trace gas trends observed at high-latitudes over North America from February to May 2000

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Read Full Article (file size: 1277634 bytes) Cited by JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 108, NO. D4, 8369, doi:10.1029/2001JD001390, 2003 Ozone, aerosol, potential vorticity, and trace gas trends observed at high-latitudes over North America from February to May 2000 Edward V. Browell Atmospheric Sciences, NASA Langley Research Center, Hampton, Virginia, USA Johnathan W. Hair Atmospheric Sciences, NASA Langley Research Center, Hampton, Virginia, USA Carolyn F. Butler Science Application International Corporation, Hampton, Virginia, USA William B. Grant Atmospheric Sciences, NASA Langley Research Center, Hampton, Virginia, USA Russell J. DeYoung Atmospheric Sciences, NASA Langley Research Center, Hampton, Virginia, USA Marta A. Fenn Science Application International Corporation, Hampton, Virginia, USA Vince G. Brackett Science Application International Corporation, Hampton, Virginia, USA Marian B. Clayton Science Application International Corporation, Hampton, Virginia, USA Lorraine A. Brasseur Science Application International Corporation, Hampton, Virginia, USA David B. Harper Science Application International Corporation, Hampton, Virginia, USA Brian A. Ridley National Center for Atmospheric Research, Boulder, Colorado, USA Andrzej A. Klonecki National Center for Atmospheric Research, Boulder, Colorado, USA Peter G. Hess National Center for Atmospheric Research, Boulder, Colorado, USA Louisa K. Emmons National Center for Atmospheric Research, Boulder, Colorado, USA Xuexi Tie National Center for Atmospheric Research, Boulder, Colorado, USA Elliot L. Atlas National Center for Atmospheric Research, Boulder, Colorado, USA Christopher A. Cantrell National Center for Atmospheric Research, Boulder, Colorado, USA Anthony J. Wimmers Department of Environmental Sciences, University of Virginia, Charlottesville, Virginia, USA Donald R. Blake Department of Chemistry, University of California, Irvine, California, USA Michael T. Coffey National Center for Atmospheric Research, Boulder, Colorado, USA James W. Hannigan National Center for Atmospheric Research, Boulder, Colorado, USA Jack E. Dibb Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, New Hampshire, USA Robert W. Talbot Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, New Hampshire, USA Frank Flocke National Center for Atmospheric Research, Boulder, Colorado, USA Andrew J. Weinheimer National Center for Atmospheric Research, Boulder, Colorado, USA Alan Fried National Center for Atmospheric Research, Boulder, Colorado, USA Bryan Wert National Center for Atmospheric Research, Boulder, Colorado, USA Julie A. Snow Graduate School of Oceanography, University of Rhode Island, Rhode Island, USA Barry L. Lefer National Center for Atmospheric Research, Boulder, Colorado, USA Abstract Ozone (O₃) and aerosol scattering ratio profiles were obtained from airborne lidar measurements on thirty-eight flights over seven deployments covering the latitudes of 40°–85°N between 4 February and 23 May 2000 as part of the Tropospheric Ozone Production about the Spring Equinox (TOPSE) field experiment. Each deployment started from Broomfield, Colorado, with bases in Churchill, Canada, and on most deployments, Thule Air Base, Greenland. Nadir and zenith lidar O₃ measurements were combined with in situ O₃ measurements to produce vertically continuous O₃ profiles from near the surface to above the tropopause. Potential vorticity (PV) distributions along the flight track were obtained from several different meteorological analyses. Ozone, aerosol, and PV distributions were used together to identify the presence of pollution plumes and stratospheric intrusions. Ozone was found to increase in the middle free troposphere (4–6 km) at high latitudes (60°–85°N) by an average of 4.6 ppbv/mo (parts per billion by volume per month) from about 54 ppbv in early February to over 72 ppbv in mid-May. The average aerosol scattering ratios at 1064 nm in the same region increased rapidly at an average rate of 0.36/mo from about 0.38 to over 1.7. Ozone and aerosol scattering were highly correlated over the entire field experiment, and PV and beryllium (⁷Be) showed no significant positive trend over the same period. The primary cause of the observed O₃ increase in the mid troposphere at high latitudes was determined to be the photochemical production of O₃ in pollution plumes with less than 20% of the increase from stratospherically-derived O₃. Published 28 February 2003. Index Terms: 0365 Atmospheric Composition and Structure: Troposphere—composition and chemistry; 3362 Meteorology and Atmospheric Dynamics: Stratosphere/troposphere interactions. Read Full Article (file size: 1277634 bytes) Cited by Citation: Browell, E. V., et al. (2003), Ozone, aerosol, potential vorticity, and trace gas trends observed at high-latitudes over North America from February to May 2000, J. Geophys. Res., 108(D4), 8369, doi:10.1029/2001JD001390. Copyright 2003 by the American Geophysical Union.

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