Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 2 2009 10.5194/acpd-9-5785-2009 http://www.atmos-chem-phys-discuss.net/9/5785/2009/ http://www.atmos-chem-phys-discuss.net/9/5785/2009/acpd-9-5785-2009.html http://www.atmos-chem-phys-discuss.net/9/5785/2009/acpd-9-5785-2009.pdf 5785 5808 2009-03-04 Data assimilation of CALIPSO aerosol observations T. T. Sekiyama T. Y. Tanaka A. Shimizu T. Miyoshi Meteorological Research Institute, Tsukuba, Japan National Institute for Environmental Studies, Tsukuba, Japan Japan Meteorological Agency, Tokyo, Japan now at: University of Maryland, USA We have developed an advanced data assimilation system for a global aerosol model with a four-dimensional ensemble Kalman filter in which the Level 1B data from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) were successfully assimilated for the first time, to the best of the authors' knowledge. 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