Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 5 2009 10.5194/acpd-9-19205-2009 http://www.atmos-chem-phys-discuss.net/9/19205/2009/ http://www.atmos-chem-phys-discuss.net/9/19205/2009/acpd-9-19205-2009.html http://www.atmos-chem-phys-discuss.net/9/19205/2009/acpd-9-19205-2009.pdf 19205 19241 2009-09-16 Constraint of anthropogenic NOx 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 (NOx) 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 (9:30 a.m. local time versus 1:30 p.m.), and explicitly accounts for diurnal variations in anthropogenic emissions of NOx as well as their tropospheric lifetime and column concentrations. The approach is based on the daytime variation of NOx (when its lifetime is relatively short) alone; and potential errors in inverse modeling by neglecting horizontal transport are minimized. Separation of anthropogenic sectors relies on the estimated diurnal profiles and budget uncertainties. Our best top-down estimate suggests a national budget of 6.8 Tg N/yr (5.5 Tg N/yr for East China), close to the a priori bottom-up emission estimate from the INTEX-B mission. 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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