Physical Oceanography, Vol. 13, No. 6, 2003
EXPERIMENTAL AND FIELD RESEARCH
APPLICATION OF THE ALTIMETRY DATA TO THE ANALYSIS OF WATER
BALANCE OF THE BLACK SEA
Yu. N. Goryachkin, V. A. Ivanov, E. M. Lemeshko, and M. M. Lipchenko
We compare the estimates of the flow rates for the Upper and Lower Bosporus Currents obtained
by using both the altimetry data on the Black-Sea level and the data of the coastal stations. Ear-
lier, in analyzing the water exchange, it was customary to use the mean sea level computed ac-
cording to the data of coastal stations located along the coast of the former Soviet Union. It is
shown that the seasonal and annual variations of the increments of the mean sea level are quali-
tatively similar for the data of both types. At the same time, the values of the amplitudes of sea-
sonal variations are noticeably different. The use of the increments of the mean sea level com-
puted according to the altimetry data leads to insignificant changes in the annual water exchange
through Bosporus as compared with the values obtained by using the coastal data. However, the
seasonal variations of these data are somewhat different. We propose an algorithm for the evalu-
ation of increments of the sea level, which, in authors’ opinion, decreases the error in the analysis
of water balance.
The appearance of precision altimetry data on the sea level guaranteeing the accuracy of measurements of
makes it possible to use these data for the improvement of evaluation of the water balance of the
Black Sea by using the corrected values of the mean sea level. Earlier, this quantity was computed as the aver-
age value according to the data of 12 level stations and used in the procedure proposed in  to close the equa-
tion of water balance. It is necessary to know the relationship between this value and the actual value of the
mean sea level [in the present work, the actual mean value of the sea level is defined as the level averaged over
the deep-water part of the sea according to the data of the TOPEX/Poseidon satellite (France–USA)]
present work, we determine the discrepancy between different values of the mean sea level and, hence, more
precise values of the amplitude and phase of water exchange through Bosporus.
In our calculations, we used the monthly average data of 12 level stations (Primorskoye, Odessa, Khorly,
Chernomorskoye, Evpatoriya, Sevastopol, Yalta, Feodosiya, Novorossiisk, Tuapse, Poti, and Batumi) collected
in 1992–1998. We also used the 10-day altimetry data from the TOPEX/Poseidon satellite obtained for all
tracks crossing the Black Sea for the same period of time.
For better comparability, the data of observations from the coastal stations and the altimetry data were pro-
cessed by using the same procedure. As the source data from the coastal stations, we used the monthly average
values of the sea level computed as a result of averaging over the indicated 12 stations. Further, we found the
mean value of the sea level in 1993–1995 and, finally, determined the deviations from the indicated mean value
for each month. We used this procedure of calculations because it was applied for the evaluation of deviations
from the mean level of the altimetry data from the TOPEX/Poseidon satellite. In the case of altimetry data, the
10-day deviations of the sea level were recalculated into monthly average values and then averaged over the en-
Marine Hydrophysical Institute, Ukrainian Academy of Sciences, Sevastopol. Marine Department of the Ukrainian Scientific-Research
Hydromechanical Institute, Sevastopol. Translated from Morskoi Gidrofizicheskii Zhurnal, No.
2003. Original article submitted May 5, 2002.
0928-5105/03/1306–0355 $25.00 © 2003 Plenum Publishing Corporation 355