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The dust aerosol effect consists in the underestimation of the standard satellite-derived LWN spectra in the visible domain, and this effect is more essential for shorter wavelengths.

This approach is illustrated by the detailed analysis of the data which correspond to the local peak for 10 September, 2003 (Julian days 252-253) in Fig. 1.

Fig. 1 presents the example of the pronounced short term temporal variability of aerosol optical thikness, taua(870), at the wavelength at 870 nm, during 17 days in 2003 according to the data of Aeronet site Forth Crete (situated at the north coast of the Crete island).

 

Fig. 1. Time series plot for the aerosol optical thickness, taua(870), between August 29 (Julian day 241) and September 14, 2003 (Julian day 257) in Aeronet site Forth Crete

 

Fig. 2. Spatial variations of satellite-derived values of LWN (a), and taua(865) (b), along the linear section in the Eastern Mediterranean Sea near 34.64N, for two days in September 2003; the dates of satellite measurements are indicated in the legends.

 

Fig. 3. Comparison of typical satellite-derived spectra of LWN in two selected sites: (a) Mediterranean Sea (near the Crete island) on 30 and 31 August 2003, and (b) Black Sea (north-east part) on 30 August and 1 September 2003; the dates of satellite measurements are indicated in the legends.

 

Suslin V.V., Suetin V.S., Korolev S.N., Kucheryaviy, A.A. Desert dust effects in the results of atmospheric correction of satelle sea color observations // Current Problems in Optics of Natural Waters: Proc. 4th Int. Conf. (Nizhny Novgorod, September 11 - 15, 2007) Nizhny Novgorod. - 2007. - P. 184 - 187.

 

 

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Curator: Violetta Suslina