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Assimilated inversion of NO x emissions over east Asia using OMI NO 2 column measurements
Author(s) -
Zhao Chun,
Wang Yuhang
Publication year - 2009
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2008gl037123
Subject(s) - inversion (geology) , troposphere , environmental science , chemical transport model , emission inventory , a priori and a posteriori , atmospheric sciences , fossil fuel , air quality index , climatology , east asia , combustion , china , meteorology , geology , geography , structural basin , chemistry , geomorphology , philosophy , organic chemistry , epistemology , archaeology
Assimilated inversion on a daily basis using OMI tropospheric NO 2 columns is developed and applied in a regional chemical transport model (REAM) to constrain fossil fuel (FF) NO x emissions over east Asia in 2007. The iterative nature of the assimilated inversion improves upon the widely used monthly‐mean inversion by accounting for the chemical feedbacks of changed NO x emissions and reducing the dependence of the a priori emissions. The assimilated a posteriori emissions from FF combustion over east Asia are 9.5 Tg N/yr comparable to 10.9 Tg N/yr of the a priori. Significant changes in the spatial distribution of FF NO x emissions are found in the assimilated inversion from the a priori or monthly‐mean inversion. The assimilated inversion shows that the a priori FF NO x emission inventory tends to overestimate the emissions over the economically developed areas and underestimate over the underdeveloped areas in East China, which may reflect in part FF NO x emission reductions resulting from the urban‐centric air quality controls in China.