Statistical structure of the large-scale fields of temperature and salinity in the Black Sea |
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| Authors: | A B Polonskii I G Shokurova |
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| Institution: | (1) Marine Hydrophysical Institute, Ukrainian National Academy of Sciences, Sevastopol, Ukraine |
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| Abstract: | In order to reconstruct the large-scale temperature and salinity fields by the method of optimal interpolation of the archival
data, we compute the correlation functions and analyze the space and time variations of the statistical structure of the fields.
On the sea surface, the thermohaline fields are spatially inhomogeneous. Thus, the correlation functions are anisotropic in
the region of the northwest shelf and close to isotropic in the inner parts of the sea. The values of correlation length vary
from season to season. In the layer of pycnocline, the temperature and salinity fields are anisotropic. In the zonal direction,
the correlation length is 2–3 times greater than in the meridional direction. The indicated anisotropy becomes stronger in
the winter season and weaker in the summer season as a consequence of the seasonal variability of large-scale circulation.
We study the dependence of the error of reconstruction of the fields by the method of optimal interpolation on the form of
approximation of the correlation functions with regard for anisotropy.
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Translated from Morskoi Gidrofizicheskii Zhurnal, No. 1, pp. 51–65, January–February, 2008. |
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