title: Improvement of aerosol optical properties modeling over Eastern Asia with MODIS AOD assimilation in a global non-hydrostatic icosahedral aerosol transport model.
abstract: A new global aerosol assimilation system adopting a more complex icosahedral grid configuration is developed. Sensitivity tests for the assimilation system are performed utilizing satellite retrieved aerosol optical depth (AOD) from the Moderate Resolution Imaging Spectroradiometer (MODIS), and the results over Eastern Asia are analyzed. The assimilated results are validated through independent Aerosol Robotic Network (AERONET) observations. Our results reveal that the ensemble and local patch sizes have little effect on the assimilation performance, whereas the ensemble perturbation method has the largest effect. Assimilation leads to significantly positive effect on the simulated AOD field, improving agreement with all of the 12 AERONET sites over the Eastern Asia based on both the correlation coefficient and the root mean square difference (assimilation efficiency). Meanwhile, better agreement of the Ångström Exponent (AE) field is achieved for 8 of the 12 sites due to the assimilation of AOD only.
authors.affiliation: State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, China; Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan. Electronic address: daitie@mail.iap.ac.cn.
authors.forename: Tie
authors.initials: T
authors.lastname: Dai
authors.affiliation: Atmosphere, Ocean and Planetary Physics, University of Oxford, UK.
authors.forename: Nick A J
authors.initials: NA
authors.lastname: Schutgens
authors.affiliation: National Institute for Environmental Studies, Tsukuba, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Goto
authors.affiliation: State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China.
authors.forename: Guangyu
authors.initials: G
authors.lastname: Shi
authors.affiliation: Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan.
authors.forename: Teruyuki
authors.initials: T
authors.lastname: Nakajima
mesh_terms: D000336:Aerosols / Q000032:analysis*; D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data; D001208:Asia; D004784:Environmental Monitoring / Q000379:methods*; D008956:Models, Chemical; D063809:Satellite Imagery
chemical_list: D000336:Aerosols; D000393:Air Pollutants
keywords: Aerosol assimilation; Aerosol optical properties; Eastern Asia; Non-hydrostatic icosahedral aerosol model