Increasing springtime ozone mixing ratios in the free troposphere over western North America

O. R. Cooper (), D. D. Parrish, A. Stohl, M. Trainer, P. Nédélec, V. Thouret, J. P. Cammas, S. J. Oltmans, B. J. Johnson, D. Tarasick, T. Leblanc, I. S. McDermid, D. Jaffe, R. Gao, J. Stith, T. Ryerson, K. Aikin, T. Campos, A. Weinheimer and M. A. Avery
Additional contact information
O. R. Cooper: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80309, USA
D. D. Parrish: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, Colorado 80305, USA
A. Stohl: Norwegian Institute for Air Research, PO Box 100, N-2027 Kjeller, Norway
M. Trainer: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, Colorado 80305, USA
P. Nédélec: Laboratoire d’Aérologie, Centre National de la Recherche Scientifique, Observatoire Midi-Pyrénées, 14 Avenue E. Belin, 31400 Toulouse, France
V. Thouret: Laboratoire d’Aérologie, Centre National de la Recherche Scientifique, Observatoire Midi-Pyrénées, 14 Avenue E. Belin, 31400 Toulouse, France
J. P. Cammas: Laboratoire d’Aérologie, Centre National de la Recherche Scientifique, Observatoire Midi-Pyrénées, 14 Avenue E. Belin, 31400 Toulouse, France
S. J. Oltmans: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, Colorado 80305, USA
B. J. Johnson: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, Colorado 80305, USA
D. Tarasick: Meteorological Service of Canada, Environment Canada, 4905 Dufferin Street, Downsview, Ontario M3H 5T4, Canada
T. Leblanc: Table Mountain Facility, Jet Propulsion Laboratory, California Institute of Technology, 24490 Table Mountain Road, Wrightwood, California 92397-0367, USA
I. S. McDermid: Table Mountain Facility, Jet Propulsion Laboratory, California Institute of Technology, 24490 Table Mountain Road, Wrightwood, California 92397-0367, USA
D. Jaffe: University of Washington-Bothell, 18115 Campus Way NE, Bothell, Washington 98011-8246, USA
R. Gao: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, Colorado 80305, USA
J. Stith: NCAR Research Aviation Facility, National Center for Atmospheric Research, 10802 Airport Court, Broomfield, Colorado 80021, USA
T. Ryerson: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, Colorado 80305, USA
K. Aikin: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80309, USA
T. Campos: National Center for Atmospheric Research, PO Box 3000, Boulder, Colorado 80305-3000, USA
A. Weinheimer: National Center for Atmospheric Research, PO Box 3000, Boulder, Colorado 80305-3000, USA
M. A. Avery: NASA Langley Research Center, Hampton, Virginia 23681-2199, USA

Nature, 2010, vol. 463, issue 7279, 344-348

Abstract: America's ozone imports Anthropogenic emissions of ozone precursors, chiefly nitrogen oxides and volatile organic compounds, have caused widespread increases in lower-atmosphere concentrations of ozone since the late 1800s. In the lowermost part of the atmosphere ozone is a greenhouse gas that can have detrimental effects on plant and animal life. At present East Asia has the fastest rate of growth in such emissions and much of its pollution is exported towards North America. A compilation of springtime ozone measurements from across western North America now provides evidence for a strong increase in ozone mixing ratios during 1995–2008. The rate of increase in ozone mixing ratio is greatest when measurements are more heavily influenced by direct transport from Asia. This phenomenon, previously suspected but not confirmed, may make it more difficult for the United States to meet its own ozone air quality standard.

Date: 2010
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DOI: 10.1038/nature08708

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