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Original Research Papers

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 measurements

Authors:

Beat Schmid ,

Bay Area Environmental Research Institute, San Francisco, CA, US
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John M. Livingston,

SRI International, Menlo Park, CA, US
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Philip B. Russell,

NASA Ames Research Center, Moffett Field, CA, US
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Philip A. Durkee,

Naval Postgraduate School, Monterey, CA, US
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Haflidi H. Jonsson,

Naval Postgraduate School, Monterey, CA, US
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Donald R. Collins,

California Institute of Technology, Pasadena, CA; Texas A&M University, College Station, TX, US
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Richard C. Flagan,

California Institute of Technology, Pasadena, CA, US
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John H. Seinfeld,

California Institute of Technology, Pasadena, CA, US
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Santiago Gassó,

University of Washington, Seattle, WA, US
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Dean A. Hegg,

University of Washington, Seattle, WA, US
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Elisabeth Öström,

Meteorological Institute, Stockholm University, Stockholm, SE; Meteorological Office, Hadley Centre, Bracknell, GB
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Kevin J. Noone,

Meteorological Institute, Stockholm University, Stockholm, SE
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Ellsworth J. Welton,

University of Miami, Miami, FL; Science Systems and Applications Inc., Greenbelt, MD, US
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Kenneth J. Voss,

University of Miami, Miami, FL, US
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Howard R. Gordon,

University of Miami, Miami, FL, US
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Paola Formenti,

Max Planck Institute for Chemistry, Mainz, DE
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Meinrat O. Andreae

Max Planck Institute for Chemistry, Mainz, DE
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Abstract

We 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 (λ=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 λ=525 nm), but these differences are within the combined error bars of the measurements and computations.

How to Cite: Schmid, B., Livingston, J.M., Russell, P.B., Durkee, P.A., Jonsson, H.H., Collins, D.R., Flagan, R.C., Seinfeld, J.H., Gassó, S., Hegg, D.A., Öström, E., Noone, K.J., Welton, E.J., Voss, K.J., Gordon, H.R., Formenti, P. and Andreae, M.O., 2000. 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 measurements. Tellus B: Chemical and Physical Meteorology, 52(2), pp.568–593. DOI: http://doi.org/10.3402/tellusb.v52i2.16659
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  Published on 01 Jan 2000
 Accepted on 4 Oct 1999            Submitted on 28 Dec 1998

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