Physical Oceanography, Vol.
2, July, 2011 (Ukrainian Original No.
2, March–April, 2011)
COMPARATIVE ANALYSIS OF THE METHODS USED FOR THE DETERMINATION
OF THE OPTICAL PARAMETERS OF WATERS IN THE BLACK SEA ACCORDING
TO THE DATA OF SATELLITE MEASUREMENTS
V. S. Suetin,
S. N. Korolev, V. V. Suslin, and A. A. Kucheryavyi
We demonstrate the possibility of determination of the spectral characteristics of absorption and back-
ward scattering of light in the Black Sea according to the data of a SeaWiFS satellite device. We use
specially selected data of observations obtained under favorable atmospheric conditions. It is shown that
the results of calculations performed by using different methods are almost identical and weakly depend
on the model parameters of the spectral course of the coefficients of absorption of light by yellow sub-
stance and its scattering by suspended particles.
Keywords: Black Sea, optical parameters, spectral characteristics, satellite measurements.
As one of the fields of application of the data of remote satellite observations, one can mention the determi-
nation of the optical characteristics of seawater. To solve this problem, it is possible to use various methods and
algorithms available from the literature [1–4]. For the better comprehension of their possibilities and specific
features, it is useful to perform the comparative analysis of the results obtained by using different methods on
the basis of the data of actual satellite observations of the Black Sea.
In the present work, we consider some examples of testing the three algorithms from [2–4] used to compute
the spectral coefficients of the total absorption and backward scattering of light in the upper layer of the sea In
what follows, these quantities are denoted by
, respectively (
is the length of the emitted
wave). These data are necessary for the proper interpretation of the results of observations of various hydro-
physical processes, modeling of the conditions of formation of the light field in the sea, etc.
A convenient practical procedure of determination of the quantities
and 555 nm is proposed in . The algorithms considered in the present work enable us to compute
for all basic spectral channels of the SeaWiFS (Sea-Viewing Wide Field-of-View Sensor) and MODIS
(Moderate Resolution Imaging Spectroradiometer) devices under the conditions of independent multifactor
variations of these quantities.
To perform test calculations, we used the results of satellite surveys of the Black Sea stored in the archive of
the NASA Goddard Space Flight Center, USA (NASA GSFC) and available through the Internet. To process
these data, we applied the SeaDAS software system . As the input data, we took the values of the spectral
normalized water leaving radiance
obtained in the stage of taking into account the atmospheric distor-
tions (atmospheric correction). The atmospheric correction is a serious problem and its detailed analysis lies far
beyond the scope of the present work. It is known that the reliability of the results of determination of the pa-
for the Black Sea is often doubtful [1, 6–8].
Marine Hydrophysical Institute, Ukrainian National Academy of Sciences, Sevastopol, Ukraine.
Translated from Morskoi Gidrofizicheskii Zhurnal, No.
33–42, March–April, 2011. Original article submitted November 24, 2009;
revision submitted December 21, 2009.
106 0928–5105/11/2102–0106 © 2011 Springer Science+Business Media, Inc.