Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 10 1 2010 10.5194/acp-10-63-2010 http://www.atmos-chem-phys.net/10/63/2010/ http://www.atmos-chem-phys.net/10/63/2010/acp-10-63-2010.html http://www.atmos-chem-phys.net/10/63/2010/acp-10-63-2010.pdf 63 78 2010-01-07 Constraint of anthropogenic NO_x emissions in China from different sectors: a new methodology using multiple satellite retrievals J.-T. Lin jlin5@seas.harvard.edu M. B. McElroy K. F. Boersma School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA KNMI, Climate Observations Department, De Bilt, The Netherlands A new methodology is developed to constrain Chinese anthropogenic emissions of nitrogen oxides (NO_x) from four major sectors (industry, power plants, mobile and residential) in July 2008. It combines tropospheric NO₂ column retrievals from GOME-2 and OMI, taking advantage of their different passing time over China (~10:00 a.m. LT (local time) versus ~02:00 p.m.) and consistent retrieval algorithms. The approach is based on the difference of NO_x columns at the overpass times of the two instruments; it thus is less susceptible to the likely systematic errors embedded in individual retrievals that are consistent with each other. Also, it explicitly accounts for diurnal variations and uncertainties of NO_x emissions for individual sources. Our best top-down estimate suggests a national budget of 6.8 TgN/yr (5.5 TgN/yr for East China), close to the a priori bottom-up emission estimate from the INTEX-B mission for the year of 2006. The top-down emissions are lower than the a priori near Beijing, in the northeastern provinces and along the east coast; yet they exceed the a priori over many inland regions. 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