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Aerosol Absorption Retrieval at Ultraviolet Wavelengths in a Complex EnvironmentWe have used total and diffuse UV irradiance measurements from a multi-filter rotating shadow-band radiometer (UVMFR) in order to investigate aerosol absorption in the UV range for a 5-year period in Athens, Greece. This dataset was used as input to a radiative transfer model and the single scattering albedo (SSA) at 368 and 332 nm was calculated. Retrievals from a collocated CIMEL sun photometer were used to evaluate the products and study the absorption spectral behavior of retrieved SSA values. The UVMFR SSA, together with synchronous, CIMEL-derived retrievals of SSA at 440 nm, had a mean of 0.90, 0.87 and 0.83, with lowest values (higher absorption) encountered at the shorter wavelengths. In addition, noticeable diurnal variation of the SSA in all wavelengths is shown, with amplitudes up to 0.05. Strong SSA wavelength dependence is revealed for cases of low Angstrom exponents, accompanied by a SSA decrease with decreasing extinction optical depth, suggesting varying influence under different aerosol composition. However, part of this dependence for low aerosol optical depths is masked by the enhanced SSA retrieval uncertainty. Dust and brown carbon UV absorbing properties were also investigated to explain seasonal patterns.
Document ID
20170001017
Acquisition Source
Langley Research Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kazadzis, Stelios
(Physikalisch-Meteorologisches Observatorium Davos, Switzerland)
Raptis, Panagiotis
(National Observatory of Athens Greece)
Kouremeti, Natalia
(Physikalisch-Meteorologisches Observatorium Davos, Switzerland)
Amirdis, Vassilis
(National Observatory of Athens Greece)
Arola, Antti
(Finnish Meteorological Inst. Helsinki, Finland)
Gerasopoulos, Evangelos
(National Observatory of Athens Greece)
Schuster, Gregory L.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
January 31, 2017
Publication Date
December 1, 2016
Publication Information
Publication: Atmospheric Measurement Techniques
Volume: 9
e-ISSN: 1867-8548
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NF1676L-25363
Funding Number(s)
WBS: WBS 652528.02.01
Distribution Limits
Public
Copyright
Other

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