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Clear-Sky Closure Studies of Lower Tropospheric Aerosol and Water Vapor During ACE-2 Using Airborne Sunphotometer, Airborne In-Situ, Space-Borne, and Ground-Based MeasurementsWe report on clear-sky column closure experiments (CLEARCOLUMN) performed in the Canary Islands during the second Aerosol Characterization Experiment (ACE-2) in June/July 1997. We present CLEARCOLUMN results obtained by combining airborne sunphotometer and in-situ (optical particle counter, nephelometer, and absorption photometer) measurements taken aboard the Pelican aircraft, space-borne NOAA/AVHRR data and ground-based lidar and sunphotometer measurements. During both days discussed here, vertical profiles flown in cloud-free air masses revealed 3 distinctly different layers: a marine boundary layer (MBL) with varying pollution levels, an elevated dust layer, and a very clean layer between the MBL and the dust layer. A key result of this study is the achievement of closure between extinction or layer aerosol optical depth (AOD) computed from continuous in-situ aerosol size-distributions and composition and those measured with the airborne sunphotometer. In the dust, the agreement in layer AOD (lambda = 380-1060 nm) is 3-8%. In the MBL there is a tendency for the in-situ results to be slightly lower than the sunphotometer measurements (10-17% at lambda = 525 nm), but these differences are within the combined error bars of the measurements and computations.
Document ID
20000052525
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
Authors
Schmid, Beat
(Bay Area Environmental Research Inst. San Francisco, CA United States)
Livingston, John M.
(SRI International Corp. Menlo Park, CA United States)
Russell, Philip B.
(NASA Ames Research Center Moffett Field, CA United States)
Durkee, Philip A.
(Naval Postgraduate School Monterey, CA United States)
Jonsson, Haflidi H.
(Naval Postgraduate School Monterey, CA United States)
Collins, Donald R.
(California Inst. of Tech. Pasadena, CA United States)
Flagan, Richard C.
(California Inst. of Tech. Pasadena, CA United States)
Seinfeld, John H.
(California Inst. of Tech. Pasadena, CA United States)
Gasso, Santiago
(Washington Univ. Seattle, WA United States)
Hegg, Dean A.
(Washington Univ. Seattle, WA United States)
Oestroem, Elisabeth
(Stockholm Univ. Sweden)
Voss, Kenneth J.
(Miami Univ. FL United States)
Gordon, Howard R.
(Miami Univ. FL United States)
Formenti, Paolo
(Max-Planck-Inst. fuer Chemie Mainz, Germany)
Andreae, Meinrat O.
(Max-Planck-Inst. fuer Chemie Mainz, Germany)
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
Geophysics
Distribution Limits
Public
Copyright
Other

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