Dr. Oleg Dubovik Profile

Dr. Oleg Dubovik

at Lab d'optique atmosphèrique

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Author

Publications (13)

Proceedings Article | 22 April 2008 Paper

PHOTONS/AERONET sunphotometer network overview: description, activities, results

P. Goloub, Z. Li, O. Dubovik, L. Blarel, T. Podvin, I. Jankowiak, R. Lecoq, C. Deroo, B. Chatenet, J. Morel, E. Cuevas, R. Ramos

Proceedings Volume 6936, 69360V (2008) https://doi.org/10.1117/12.783171

KEYWORDS: Calibration, Aerosols, Atmospheric particles, Photons, LIDAR, Polarization, Atmospheric modeling, Scattering, Sun, Sensors

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Proceedings Article | 8 December 2006 Paper

Aeronet's Version 2.0 quality assurance criteria

B. Holben, T. Eck, I. Slutsker, A. Smirnov, A. Sinyuk, J. Schafer, D. Giles, O. Dubovik

Proceedings Volume 6408, 64080Q (2006) https://doi.org/10.1117/12.706524

KEYWORDS: Aerosols, Scattering, Databases, Atmospheric modeling, Particles, Combustion, Data modeling, Spherical lenses, Refraction, Sun

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Proceedings Article | 21 April 2006 Paper

Atmospheric particulate matter variability in an industrial center from multi-wavelength lidar and Sun-sky radiometer measurements

A. Chaikovsky, A. Ivanov, M. Korol, A. Slesar, S. Denisov, F. Osipenko, I. Hutko, O. Dubovik, B. Holben, Ph. Goloub

Proceedings Volume 6160, 61601Y (2006) https://doi.org/10.1117/12.675466

KEYWORDS: Atmospheric particles, Aerosols, LIDAR, Radiometry, Atmospheric modeling, Data processing, Atmospheric optics, Backscatter, Particles, Atmospheric monitoring

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SPIE Journal Paper | 1 April 2005

Aerosol ultraviolet absorption experiment (2002 to 2004), part 2: absorption optical thickness, refractive index, and single scattering albedo

Nickolay Krotkov, Pawan Bhartia, Jay Herman, James Slusser, Gwendolyn Scott, Gordon Labow, Alexander Vasilkov, Tom Eck, Oleg Doubovik, Brent Holben

OE, Vol. 44, Issue 04, 041005, (April 2005) https://doi.org/10.1117/12.10.1117/1.1886819

KEYWORDS: Aerosols, Ultraviolet radiation, Absorption, Refractive index, Atmospheric modeling, Ozone, Atmospheric particles, Calibration, Visible radiation, Scattering

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Proceedings Article | 30 December 2004 Paper

Retrieving sources of fine aerosols from MODIS and AERONET observations by inverting GOCART model

Oleg Dubovik, Tatyana Lapyonok, Yoram Kaufman, Mian Chin, Paul Ginoux, Lorraine Remer, Brent Holben

Proceedings Volume 5652, (2004) https://doi.org/10.1117/12.579069

KEYWORDS: Aerosols, Atmospheric modeling, MODIS, Atmospheric particles, Satellites, Ocean optics, Carbon, Meteorology, Computer simulations, Earth observing sensors

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Proceedings Article | 14 October 2004 Paper

Measuring aerosol UV absorption optical thickness by combining use of shadowband and almucantar techniques

Nickolay Krotkov, Pawan Bhartia, Jay Herman, James Slusser, Gwen Scott, Gordon Labow, Alexander Vasilkov, Thomas Eck, Oleg Dubovik, Brent Holben

Proceedings Volume 5545, (2004) https://doi.org/10.1117/12.559557

KEYWORDS: Aerosols, Ultraviolet radiation, Absorption, Refractive index, Visible radiation, Scattering, Ozone, Radiometry, Calibration, Atmospheric modeling

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We report final results of an aerosol UV absorption closure experiment where a UV-shadow-band radiometer (UV-MFRSR, USDA UVB Monitoring and Research Network) and 4 rotating sun-sky radiometers (CIMEL, NASA AERONET network) were run side-by-side continuously for 17 months at NASA/GSFC site in Greenbelt, MD. The aerosol extinction optical thickness τ_ext, was measured by the CIMEL direct-sun technique in the visible and at two UV wavelengths 340 and 380 nm. These results were used for UV-MFRSR daily on-site calibration and 3-min measurements of τ_ext at 325nm, 332nm and 368nm. The τ_ext measurements were used as input to the radiative transfer model along with AERONET retrievals of the column-integrated particle size distribution (PSD)to infer an effective imaginary part of the UV aerosol refractive index, k, by fitting MFRSR measured voltage ratios. Using all cases for cloud-free days, we derive diurnal and seasonal dependence of the aerosol absorption optical thickness, τ_abs with an uncertainty 0.01-0.02. At our site τ_abs follows pronounced seasonal dependence with maximum values ~0.07 at 368nm (~0.15 at 325nm) occurring in summer hazy conditions and <0.02 in winter-fall seasons, when aerosol loadings are small. Inferred values of k allow calculation of the single scattering albedo, ω, in UVA and comparisons with AERONET almucantar ω₄₄₀ retrievals at 440nm. Overall, ω was slightly lower in UV than in the visible: case average <ω₃₆₈>=0.93 compared to <ω₄₄₀>=0.95. However, the differences (<ω₄₄₀ - ω₃₆₈> ~0.02, rms difference ~0.016) are smaller than uncertainties of both retrievals (δω~0.03). Low <ω₃₆₈> values are consistent with higher values for imaginary refractive index, k: <k₃₆₈> ~0.01 compare to <k₄₄₀> ~0.006. However, mean differences in k (<k₃₆₈-k₄₄₀>~0.004) were only slightly larger than AERONET retrieval uncertainty δk ~0.003²⁷. We also found that ω decreases with decrease in τ_ext, suggesting different aerosol composition in summer and winter months. So far, our results do not allow explaining the causes of apparent larger aerosol absorption in UV. Continuing co-located measurements at GFSC is important to improve the comparison statistics, but conducting aerosol absorption measurements at different sites with varying conditions is also desirable.

Proceedings Article | 23 February 2004 Paper

Methodology and sample results of retrieving aerosol parameters by combined multiwavelength lidar and Sun-sky scanning measurements

Anatoly Chaikovsky, A. Bril, Vladimir Barun, O. Dubovik, Brent Holben, Philippe Goloub, P. Sobolewski

Proceedings Volume 5397, (2004) https://doi.org/10.1117/12.548588

KEYWORDS: Aerosols, LIDAR, Atmospheric particles, Data processing, Atmospheric modeling, Refractive index, Error analysis, Backscatter, Data modeling, Radiometry

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Proceedings Article | 4 November 2003 Paper

Deriving aerosol parameters from absolute UV sky radiance measurements using a Brewer double spectrometer

Alexander Cede, Gordon Labow, Matthew Kowalewski, Nickolay Krotkov, Oleg Dubovik

Proceedings Volume 5156, (2003) https://doi.org/10.1117/12.508788

KEYWORDS: Polarization, Aerosols, Calibration, Ultraviolet radiation, Sun, Diffusers, Optical filters, Spectroscopy, Polarizers, Scattering

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Proceedings Article | 4 November 2003 Paper

Goddard UV aerosol absorption closure experiment (2002-03)

Nickolay Krotkov, Pawan Bhartia, Jay Herman, James Slusser, Gwendolyn Scott, Gordon Labow, Alexander Vasilkov, Tom Eck, Oleg Dubovik, Brent Holben

Proceedings Volume 5156, (2003) https://doi.org/10.1117/12.508967

KEYWORDS: Aerosols, Ultraviolet radiation, Refractive index, Clouds, Absorption, Atmospheric modeling, Scattering, Calibration, Atmospheric particles, Radiometry

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Proceedings Article | 28 March 2003 Paper

Retrieving atmospheric aerosol parameters on the base of multiwavelength lidar and sun sky-scanning radiometer data

Anatoly Chaikovsky, O. Dubovik, Brent Holben, Andrey Bril, Vladimir Barun

Proceedings Volume 5027, (2003) https://doi.org/10.1117/12.497314

KEYWORDS: Aerosols, LIDAR, Atmospheric modeling, Radiometry, Atmospheric particles, Sun, Data modeling, Algorithm development, Atmospheric optics, Refractive index

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Proceedings Article | 28 February 2002 Paper

Methodology to retrieve atmospheric aerosol parameters by combining ground-based measurements of multiwavelength lidar and sun sky-scanning radiometer

Anatoly Chaikovsky, O. Dubovik, Brent Holben, Andrey Bril

Proceedings Volume 4678, (2002) https://doi.org/10.1117/12.458450

KEYWORDS: Aerosols, LIDAR, Atmospheric particles, Radiometry, Sun, Radio optics, Atmospheric modeling, Zinc, Data modeling, Atmospheric optics

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Proceedings Article | 23 December 1994 Paper

Determination of soot-like component presence from brightness spectra measurements of a cloud layer: design of cloud brightness model by means of intraclouds phase function measurements

Sergey Oshchepkov, Tatjana Lapyonok, Oleg Dubovik

Proceedings Volume 2309, (1994) https://doi.org/10.1117/12.196680

KEYWORDS: Clouds, Particles, Inverse optics, Scattering, Atmospheric modeling, Inverse problems, Phase measurement, Absorption, Light scattering, Water

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Proceedings Article | 23 December 1994 Paper

Improved technique for statistically optimum inversion of optical data in presence of measurements and model noise

Oleg Dubovik, Tatjana Lapyonok, Sergey Oshchepkov

Proceedings Volume 2309, (1994) https://doi.org/10.1117/12.196675

KEYWORDS: Statistical analysis, Data modeling, Error analysis, Remote sensing, Matrices, Inverse optics, Atmospheric modeling, Satellites, Chemical elements, Optimization (mathematics)

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Showing 5 of 13 publications

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