Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 5 2008 10.5194/acpd-8-17297-2008 http://www.atmos-chem-phys-discuss.net/8/17297/2008/ http://www.atmos-chem-phys-discuss.net/8/17297/2008/acpd-8-17297-2008.html http://www.atmos-chem-phys-discuss.net/8/17297/2008/acpd-8-17297-2008.pdf 17297 17341 2008-09-17 Investigation of NO_x emissions and NO_x-related chemistry in East Asia using CMAQ-predicted and GOME-derived NO₂ columns K. M. Han C. H. Song chsong@gist.ac.kr H. J. Ahn C. K. Lee A. Richter J. P. Burrows J. Y. Kim J. H. Woo J. H. Hong Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Dept. of Physics and Atmospheric Science, Dalhousie Univ., Halifax, Nova Scotia, Canada Institute of Environmental Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany Hazardous Substance Research Center, Korea Institute of Science and Technology (KIST), Seoul, Korea Dept. of Advanced Technology Fusion, Konkuk University, Seoul, Korea Air Pollution Cap System Division, National Institute of Environmental Research (NIER), Incheon, Korea This study examined the estimation accuracy of NO_x emissions over East Asia with particular focus on North China and South Korea due to their strong source (North China)-receptor (South Korea) relationship. In order to determine contributions of North China emissions to South Korean air quality accurately, it is important to examine the accuracy of the emission inventories of both regions. In this study, NO₂ columns from the US EPA Models-3/CMAQ model simulations carried out using the 2001 ACE-ASIA (Asia Pacific Regional Aerosol Characterization Experiment) emission inventory over East Asia were compared with the GOME-derived NO₂ columns. There were large discrepancies between the CMAQ-predicted and GOME-derived NO₂ columns in the fall and winter seasons. In particular, while the CMAQ-predicted NO₂ columns produced larger values than the GOME-derived NO₂ columns over South Korea (receptor region) for all four seasons, the CMAQ-predicted NO₂ columns produced smaller values than the GOME-derived NO₂ columns over North China (source region) for all seasons with the exception of summer. It is believed that there might be some estimation error in the NO_x emissions as well as large uncertainty in NO_x loss rates over North China and South Korea. Regarding the latter, this study further focused on the biogenic VOC emissions that were strongly coupled with NO_x chemistry in East Asia. It was found that the rates of NO_x loss determined by CMAQ modeling studies might be significantly low due to the possible overestimation of biogenic isoprene emissions during summer, particularly in China. In addition, due to the possible overestimation of isoprene emissions, the CMAQ-modeled NO₂/NO_x ratios might show an incorrectly high level, compared with the actual NO₂/NO_x ratios. In addition to the retarded NO_x chemical loss rates and overestimated NO₂/NO_x ratios, the omission of soil NO_x emissions over North China during summer can lead to an underestimation of NO_x emissions over North China during summer. Overall, it is estimated that the NO_x emissions in North China are underestimated possibly by ~50% over an entire year. 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