Seasonal behavior of Saharan dust events at the Mediterranean island of Lampedusa in the period 1999-2005 [An article from: Atmospheric Environment]

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Description:
Multi-filter rotating shadowband radiometer (MFRSR) measurements have been carried out at Lampedusa (35.52^oN, 12.63^oE) in 1999, and continuously since 2001. This study describes the Saharan dust (SD) events at Lampedusa on the basis of daily average optical depth at 500nm, @t, and Angstrom exponent, @a, derived from these observations. Back-trajectories ending at Lampedusa at 2000 and 4000m altitude were calculated by means of the HYSPLIT model. SD events are identified as those for which the trajectories interact with the mixed layer in places where the surface wind exceeds 7ms^-^1, or spend a large fraction of time over the Sahara. The SD days display values of @a+@D@a==0.40 and @a+@D@a=