P10     2015 and 2016 winter-time air pollution in China:  SO2 emission changes derived from a WRF-Chem/EnKF coupled data assimilation system.

Chen, Dan, Institute of Urban Meteorology, China Meteorological Administration, China, Zhiquan Liu, Junmei Ban, National Center for Atmospheric Research, and Min Chen, Institute of Urban Meteorology, China Meteorological Administration, China

We updated the WRF/Chem-EnKF DA system to quantitatively estimate the SO2 emissions using hourly surface observations as constraints. 2010 MEIC prior emissions (for month of January) were used to generate 2015 and 2016 January analyzed emissions, which revealed inhomogeneous SO2 emission changing trends for northern, western and southern China. These changes coincided to facts in reality, indicating that the updated DA system was capable to detect the emission deficiencies and optimize the emission.