the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
SAWA experiment – properties of mineral dust aerosol as seen by synergic lidar and sun-photometer measurements
Abstract. We propose a method of retrieving basic information on mineral dust aerosol particles from synergic sun-photometer and multi-wavelength lidar measurements as well as from the observations of lidar light depolarisation. We use this method in a case study of mineral dust episode in Central Europe.
Lidar signals are inversed with a modified Klett-Fernald algorithm. Aerosol optical depth measured with the sun-photometer allows to reduce uncertainties in the inversion procedure through which we estimate vertical profile of aerosol extinction.
Next we assume that aerosol particles may be represented by ensemble of randomly oriented, identical spheroids. Having calculated vertical profiles of aerosol extinction coefficients for lidar wavelengths, we compute the profiles of local Angstrom exponent. We use laser beam depolarisation together with the calculated Angstrom exponents to estimate the shapes (aspect ratios) and sizes of the spheroids. Numerical calculations are performed with the transition matrix (T-matrix) algorithm by M. Mishchenko.
The proposed method was first used during SAWA measurement campaign in Warsaw, spring 2005, to characterise the particles of desert dust, drifting over Poland with a southern-eastern wind (13–14 April). Observations and T-matrix calculations show that mode radii of spheroids representative for desert aerosols' particles are in the range of 0.15–0.3 μm, while their aspect ratios are lower than 0.7 or larger than 1.7.
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RC S5415: 'SAWA experiment paper review', Anonymous Referee #1, 15 Dec 2006
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AC S5898: 'In reply to review #1', Aleksandra Kardas, 03 Jan 2007
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AC S5898: 'In reply to review #1', Aleksandra Kardas, 03 Jan 2007
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RC S5616: 'Anonymous Referee #2', Anonymous Referee #2, 21 Dec 2006
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AC S6813: 'In reply to review #2', Aleksandra Kardas, 14 Feb 2007
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AC S6813: 'In reply to review #2', Aleksandra Kardas, 14 Feb 2007
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AC S6870: 'final author comments', Aleksandra Kardas, 20 Feb 2007
![Printer-friendly Version](https://www.atmospheric-chemistry-and-physics.net/print.gif)
![Supplement](https://www.atmospheric-chemistry-and-physics.net/supplement.gif)
-
RC S5415: 'SAWA experiment paper review', Anonymous Referee #1, 15 Dec 2006
-
AC S5898: 'In reply to review #1', Aleksandra Kardas, 03 Jan 2007
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AC S5898: 'In reply to review #1', Aleksandra Kardas, 03 Jan 2007
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RC S5616: 'Anonymous Referee #2', Anonymous Referee #2, 21 Dec 2006
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AC S6813: 'In reply to review #2', Aleksandra Kardas, 14 Feb 2007
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AC S6813: 'In reply to review #2', Aleksandra Kardas, 14 Feb 2007
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AC S6870: 'final author comments', Aleksandra Kardas, 20 Feb 2007
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Cited
3 citations as recorded by crossref.
- Identification and Characterization of Black Carbon Aerosol Sources in the East Baltic Region S. Byčenkienė et al. 10.1155/2013/380614
- Characteristics of black carbon aerosol mass concentration over the East Baltic region from two-year measurements S. Byčenkienė et al. 10.1039/c0em00480d
- Characterization of pollution events in the East Baltic region affected by regional biomass fire emissions V. Ulevicius et al. 10.1016/j.atmosres.2010.03.021