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GEOPHYSICAL RESEARCH LETTERS, VOL. 34, L08814, doi:10.1029/2007GL029326, 2007

Traffic restrictions associated with the Sino-African summit: Reductions of NOx detected from space

Yuxuan Wang

Department of Earth and Planetary Sciences and Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA


Michael B. McElroy

Department of Earth and Planetary Sciences and Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA


K. Folkert Boersma

Department of Earth and Planetary Sciences and Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA


Henk J. Eskes

Royal Netherlands Meteorological Institute, De Bilt, Netherlands


J. Pepijn Veefkind

Royal Netherlands Meteorological Institute, De Bilt, Netherlands


Abstract

Aggressive measures were instituted by the Beijing municipal authorities to restrict vehicular traffic in the Chinese capital during the recent Sino-African Summit. We show that reductions in associated emissions of NOx were detected by the Dutch-Finnish Ozone Monitoring Instrument (OMI) aboard the Aura satellite. Interpretation of these data using a 3-dimensional chemical transport model indicates that emissions of NOx were reduced by 40% over the period of November 4 to 6, 2006, for which the restrictions were in place.

Received 11 January 2007; accepted 27 March 2007; published 28 April 2007.

Keywords: Ozone Monitoring Instrument; NO2; Beijing; traffic restrictions; NOX emissions.

Index Terms: 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry; 0345 Atmospheric Composition and Structure: Pollution: urban and regional (0305, 0478, 4251); 0322 Atmospheric Composition and Structure: Constituent sources and sinks; 0480 Biogeosciences: Remote sensing.

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Citation: Wang, Y., M. B. McElroy, K. F. Boersma, H. J. Eskes, and J. P. Veefkind (2007), Traffic restrictions associated with the Sino-African summit: Reductions of NOx detected from space, Geophys. Res. Lett., 34, L08814, doi:10.1029/2007GL029326.