Physical Oceanography, Vol.
1, May, 2011 (Ukrainian Original No.
1, January–February, 2011)
ANALYSIS OF OBSERVATIONS AND METHODS FOR CALCULATING
HYDROPHYSICAL FIELDS IN THE OCEAN
KINEMATIC STRUCTURE AND MESOSCALE VARIABILITY OF THE RIM CURRENT
NEAR THE COAST OF CRIMEA (ACCORDING TO THE DATA OF INSTRUMENTAL
MEASUREMENTS IN SEPTEMBER 2008)
G. F. Dzhiganshin
and A. B. Polonsky
By using the results of processing of the instrumental data with high space resolution obtained in Sep-
tember 2008, we analyze the structure of the Rim Current in the upper 100-m layer near the coast of
Crimea. We determine the statistical characteristics of the mesoscale fluctuations of currents according
to the data of 1165 vertical probes. It is shown that the kinetic energy of intense mesoscale perturbations
observed in the vicinity of the Rim Current is of the same order of magnitude as the kinetic energy of the
Keywords: Rim Current, mesoscale variability.
The key role in the formation of the variability of hydrological fields in the Black Sea is played by the Rim
Current (one of the principal links in the circulation of Back-Sea waters). The schematic map of the surface cur-
rents in the Black Sea was first plotted by Knipovich as early as in the 1930s . The subsequent publications
(see, e.g., [2–5]) confirmed the schematic map proposed in . In these works, it was shown that the Rim Cur-
rent with velocities from 20 to 100 cm/sec is traced along the perimeter of the sea in the form of a closed cyclo-
nic gyre flowing in the zone of the continental slope parallel to the coastline at a distance from 10–15 to 20–
30 miles from the coast. The Rim Current covers at least the upper (300–400)-m layer. However, as a relatively
intense quasigeostrophic current, it is detected in the upper ~100-m layer [3, 5]. According to the contemporary
ideas, its maximum intensities are attained at the end of winter and the beginning of spring, whereas the mini-
mum intensities are observed at the end of summer and the beginning of autumn [5–7].
The variability of circulation in the Black Sea on various space-and-time scales is studied insufficiently
well. At present, there are numerous works devoted to the long-term and seasonal variations of the dynamics of
its waters (see, e.g., [5–13]). It is shown that the eddy wave processes on synoptic scales (with typical sizes
from ten to several tens kilometers and time scales from weeks to months) are observed in the upper 100-m layer
in all seasons and characterized by significant space-and-time intermittence [6, 8–10, 13]. At the same time, the
variations of the Rim Current in the subsurface layer on smaller space-and-time scales are, in fact, not studied at
Marine Hydrophysical Institute, Ukrainian National Academy of Sciences, Sevastopol, Ukraine.
Corresponding author; e-mail: email@example.com.
Translated from Morskoi Gidrofizicheskii Zhurnal, No.
25–35, January–February, 2011. Original article submitted November 20,
2009; revision submitted March 2, 2010.
0928–5105/11/2101–0023 © 2011 Springer Science+Business Media, Inc. 23