Physical Oceanography, Vol.
5, January, 2011 (Ukrainian Original No.
5, September–October, 2010)
EXPERIMENTAL AND FIELD RESEARCH
INTERANNUAL VARIATIONS OF THE RENEWAL OF WATERS OF THE COLD
INTERMEDIATE LAYER IN THE BLACK SEA FOR THE LAST DECADES
V. N. Belokopytov
On the basis of the archival hydrological data, recently accumulated data of buoy profilometers, and the
array of satellite data on sea-surface temperature, we estimate the interannual variability of the renewal
of waters of the cold intermediate layer in the Black Sea for the last two decades. We propose a proce-
dure of estimation of the intensity of renewal of waters for this layer according to the data on sea-surface
temperature in the winter period without taking into account the vertical profiles of temperature. It is in-
dicated that the last 50
yr are characterized by the alternation of periods with different intensities of ven-
tilation of the upper layer of the sea. We analyze the correlations between the temperature of waters of
the cold intermediate layer and the winter temperature of air (according to the data of meteorological sta-
tions located on the north coast of the Black Sea) and the level of salinity in the surface layer of the sea.
The role played by the last factor is emphasized.
In the works dealing with the analysis of various characteristics of the hydrological structure of waters in
the Black Sea, significant attention is given to the cold intermediate layer (CIL). This layer with minimum tem-
peratures of water is located between the seasonal and permanent pycnoclines. It is traditionally bounded by an
isotherm of 8° and appears as a result of winter convective mixing at the centers of cyclonic eddies and in the
In the major part of works dealing with the many-year variability of waters in the cold intermediate layer
(see, e.g., [1–4), it is indicated that the role of the principal external factor affecting the processes of ventilation
of waters in the winter period is played by the thermal atmospheric conditions. Against the background of the
general global trend of warming of the climate, the regional climatic variations may exhibit their own specific
features even with manifestations of the opposite trends. Thus, the investigations of long-period variations of
the thermohaline structure of waters in the Black Sea and, in particular, in the CIL (regarded as a specific feature
of this sea) do not lose their urgency.
In the present work written as a sequel of , we estimate the intensity of renewal of waters in the CIL for
the last decades. In view of the general decrease in the intensity of field studies in the open part of the sea, we
use an additional source of information for our purposes, namely, the available satellite data on the sea-surface
Marine Hydrophysical Institute, Ukrainian National Academy of Sciences, Sevastopol, Ukraine; e-mail: email@example.com.
Translated from Morskoi Gidrofizicheskii Zhurnal, No.
33–41, September–October, 2010. Original article submitted May 26, 2009;
revision submitted July 10, 2009.
0928–5105/11/2005–0347 © 2011 Springer Science+Business Media, Inc. 347