Physical Oceanography, Vol.
3, September, 2011 (Ukrainian Original No.
3, May–June, 2011)
THE STRUCTURE OF SUSPENDED MATTER IN LAKE BAIKAL ACCORDING TO
THE DATA OF MEASUREMENTS OF LIGHT SCATTERING FUNCTIONS
V. I. Man’kovsky
By using light scattering functions measured in Lake Baikal, we compute the characteristics of sus-
pended matter, such as the mass concentration and the number of particles of the mineral and biological
fractions, their mean radius, and the parameter of dispersion of mineral particles. The data on the verti-
cal distributions of the characteristics of suspended matter are obtained for various regions of the lake in
the summer period. We compare the characteristics of suspended matter in the zones of upwelling and
downwelling of waters in Lake Baikal and in the Indian Ocean, which reveals its identical specific com-
position in these waters.
Keywords: light scattering function, inverse problems, suspended matter.
The light scattering functions contain information about the parameters of dispersive media that can be
found from the solutions of the inverse problems of light scattering. The procedure of inversion of the charac-
teristics of scattering is simplified in the case of solution of the so-called restricted inverse problems . The
solution of these problems is based on the use of the parameters of scattering of light in a given direction
containing the data on the concentration of particles in water. The choice of the optimal angles
the size of particles. Thus, the larger their radius, the smaller the optimal angle.
In what follows, we present results of determination of the characteristics of suspended matter in waters of
Lake Baikal obtained according to the data of measurements of the light scattering functions by using the formu-
las for inverse problems taken from [2, 3].
Periods and Regions of Measurements
The measurements of the light scattering functions in Lake Baikal were carried out in the course of the
cruise of R/V G. Yu. Vereshchagin organized by the Irkutsk Limnological Institute of the Siberian Division of
the Academy of Sciences of the USSR together with the Sevastopol Marine Hydrophysical Institute (MHI) of
the Academy Sciences of the Ukrainian SSR in 1979. Since 11.07 till 01.08.1979, the expedition made 20 sta-
tions in the main section passing along the median line of the lake, numerous stations in the transverse sections
(across the lake), and three stations in a section passing through the Maloe More Strait (Bay). In Fig. 1, we pre-
sent the locations of stations used to measure the light scattering functions.
State of Waters in the Lake
During the period of observations, the hydrological situation in Lake Baikal was not uniform. In the South
and Middle Baikal, in the Maloe More Strait, and in a small part of the North Baikal near the estuary of the
Verkhnyaya Angara River, the surface layers were already noticeably heated and well stratified.
Marine Hydrophysical Institute, Ukrainian National Academy of Sciences, Sevastopol, Ukraine.
Translated from Morskoi Gidrofizicheskii Zhurnal, No.
14–32, March–April, 2011. Original article submitted December 16, 2009;
revision submitted February 19, 2010.
0928–5105/11/2103–0163 © 2011 Springer Science+Business Media, Inc. 163