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VERTICAL VARIATIONS IN THE PRINCIPLE CHEMICAL-PROPERTIES OF THE BLACK-SEA IN THE AUTUMN OF 1991
Date
1994-01-01
Author
BASTURK, O
SAYDAM, C
SALIHOGLU, I
EREMEEVA, LV
KONOVALOV, SK
STOYANOV, A
DIMITROV, A
COCIASU, A
DOROGAN, L
ALTABET, M
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Basin-wide principal hydrochemical data for the upper 500 m of the Black Sea were obtained at a total of 197 stations during a multi-ship, multi-institutional, HYDROBLACK-91 cruise in September 1991. Only offshore stations, 38 from the 1991 joint cruise, 5 from R/V Knorr (1988),16 from R/V Atlantis-II (1969), and 9 from R/V Bilim (1990) cruises, are considered in conjunction with the present and past data as a function of potential density rather than depth. The oxycline, coinciding with the upper boundary of the permanent pycnocline (sigma(THETA) = 14.2-14.3), extended down to the sigma(THETA) = 15.3-15.4 surfaces during warm periods (June-September) and to the sigma(THETA) = 15.75 surface during spring periods. The lower boundary of the oxycline (O2 less-than-or-equal-to 20 muM) has remained constant within the last two decades when past and present spring data are considered, but has risen by 0.30 density units when late summer-autumn data are considered. Independent of the geographical location, the base of the transition layer was established at the sigma(THETA) = 16.15-16.20 surfaces where H2S greater-than-or-equal-to 5 muM. Nitrate and phosphate reached their maxima at sigma(THETA) = 15.3-15.4 surfaces and then decreased steadily with different slopes until the sigma(THETA) = 15.85-15.95 surfaces. At the anoxic interface, phosphate concentration increases about 10 fold from approximately 0.02-0.5 muM at the sigma(THETA) = 15.85-15.90 surface to 4-6 muM at the sigma(THETA) = 16.15-16.20 surface. Comparison with the data from the 1970's suggests that both the maximum values and the depth integrated mass of nitrate (g NO3-N/m2) between the sigma(THETA) = 14.2 and 16.0 surfaces have increased 2-3 fold, and the density surface where the NO3 maximum is established has shifted by 0.30 units in the late 1980's.
Subject Keywords
General Chemistry
,
Oceanography
,
Water Science and Technology
,
Environmental Chemistry
URI
https://hdl.handle.net/11511/68535
Journal
MARINE CHEMISTRY
DOI
https://doi.org/10.1016/0304-4203(94)90099-x
Collections
Graduate School of Marine Sciences, Article
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O. BASTURK et al., “VERTICAL VARIATIONS IN THE PRINCIPLE CHEMICAL-PROPERTIES OF THE BLACK-SEA IN THE AUTUMN OF 1991,”
MARINE CHEMISTRY
, pp. 149–165, 1994, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68535.