Classification of aerosol properties derived from AERONET direct sun data G. P. Gobbi, Y. J. Kaufman, I. Koren, and T. F. Eck Inst. Scienze dell’ Atmosfera e del Clima, CNR, Rome, Italy NASA/Goddard Space Flight Center, 613.2, Greenbelt MD 20771, USA Dep. of Environ. Sciences Weizmann Institute, Rehovot 76100, Israel GEST, University of Maryland, Baltimore, MD, USA Received: 25 July 2006 – Acce...