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Altitude Differentiated Aerosol Extinction Over Tenerife (North Atlantic Coast) During ACE-2 by Means of Ground and Airborne Photometry and Lidar MeasurementsRetrievals of spectral aerosol optical depths (tau(sub a)) by means of sun photometers have been undertaken in Tenerife (28 deg 16' N, 16 deg 36' W) during ACE-2 (June-July 1997). Five ground-based sites were located at four different altitudes in the marine boundary layer and in the free troposphere, from 0 to 3570 m asl. The goal of the investigation was to provide estimates of the vertical aerosol extinction over the island, both under clean and turbid conditions. Inversion of spectral tau(sub a) allowed to retrieve size distributions, from which the single scattering albedo omega(sub 0) and the asymmetry factor g could be estimated as a function of altitude. These parameters were combined to calculate aerosol forcing in the column. Emphasis is put on episodes of increased turbidity, which were observed at different locations simultaneously, and attributed to outbreaks of mineral dust from North Africa. Differentiation of tau(sub a) as a function of altitude provided the vertical profile of the extinction coefficient sigma(sub e). For dust outbreaks, aerosol extinction is concentrated in two distinct layers above and below the strong subsidence inversion around 1200 m asl. Vertical profiles of tau(sub a) and sigma(sub e) are shown for July 8. In some occasions, vertical profiles are compared to LIDAR observations, performed both at sea level and in the low free troposphere, and to airborne measurements of aerosol optical depths.
Document ID
20000052550
Acquisition Source
Ames Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Formenti, P.
(Max-Planck-Inst. fuer Chemie Mainz, Germany)
Elias, T.
(Lille-1 Univ. Villeneuve-d'Asoq, France)
Welton, J.
(Miami Univ. FL United States)
Diaz, J. P.
(La Laguna Univ. La Laguna Spain)
Exposito, F.
(La Laguna Univ. La Laguna Spain)
Schmid, B.
(Bay Area Environmental Research Inst. San Francisco, CA United States)
Powell, D.
(Arizona Univ. Tucson, AZ United States)
Holben, B. N.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Smirnov, A.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Andreae, M. O.
(Max-Planck-Inst. fuer Chemie Mainz, Germany)
Devaux, C.
(Lille-1 Univ. Villeneuve-d'Asoq, France)
Voss, K.
(Miami Univ. FL United States)
Lelieveld, J.
(Utrecht Univ. Utrecht, Netherlands)
Livingston, J. M.
(SRI International Corp. Menlo Park, CA United States)
Russell, P. B.
(NASA Ames Research Center Moffett Field, CA United States)
Durkee, P. A.
(Naval Postgraduate School Monterey, CA United States)
Date Acquired
August 19, 2013
Publication Date
February 28, 2000
Publication Information
Publication: Analysis of Atmospheric Aerosol Data Sets and Application of Radiative Transfer Models to Compute Aerosol Effects
Subject Category
Environment Pollution
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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