Physical Oceanography, Vol. 13, No. 3, 2003
EXPERIMENTAL AND FIELD RESEARCH
BUDGET AND FLUXES OF PARTICULATE ORGANIC CARBON AND NITROGEN
ACCORDING TO THE DATA ON THEIR VERTICAL DISTRIBUTION IN
THE DEEP PART OF THE BLACK SEA
Z. P. Burlakova, L. V. Eremeeva, and S. K. Konovalov
UDC 551.464 (262.5)
On the basis of the analysis of the many-year data on the vertical distributions of particulate or-
ganic carbon and nitrogen, we compute their annual average amounts for three typical layers of
water in the deep part of the Black Sea: for a layer located above the oxycline and characterized
by the formation of new portions of particulate organic matter in the course of photosynthesis,
inside the oxycline, where the major part of oxygen is consumed and the major part of the flux of
particulate organic matter is oxidized, and for the upper part of the anoxic zone characterized by
the most active microbiological processes of oxidation of the organic substances and production
of sulfides. The available literature data on sedimentation traps are used to study the downward
annual average fluxes of particulate organic matter from the euphotic zone into the oxycline and
into the anaerobic zone. The seasonal variability of the amounts and fluxes of particulate carbon
and nitrogen is revealed.
The investigation of the vertical distribution of particulate organic matter (POM) is required for the quanti-
tative evaluation of the fluxes of organic matter and the analysis of circulation of basic biogenic elements be-
cause “the organic matter and all processes affecting its transformations in the sea are the principal factors deter-
mining the distinctive features of the chemical composition of waters in the Black Sea” .
The vertical distribution of POM was studied in [2–5]. However, all these investigations (except ) were
carried out inside the aerobic zone, devoted to the analysis only of particulate organic carbon, and irregular.
that, at present, the processes of transformation of the POM in the zones of interaction of aerobic and anaerobic
waters are studied quite poorly. At the same time, these processes strongly affect the vertical distribution of the
components of the POM
and run in the zone separating abyssal waters from the sur-
face productive layer. Hence, the data accumulated in analyzing these processes can serve as a basis for the de-
scription and numerical simulation of the biogeochemical cycles of the most important biogenic elements (e.g.,
The aim of the present work is to give a quantitative description of the seasonal variability of the amounts
for the following three typical vertical layers:
— the layer of water located above the oxycline, where the process of photosynthesis is realized;
— the layer of oxycline, where the major part of oxygen is consumed and the major part of the flux of
POM is oxidized;
— the upper part of the hydrogen-sulfide zone (up to σ
= 16.5), characterized by the most active micro-
biological processes of oxidation of the organic substances and production of sulfides.
Marine Hydrophysical Institute, Ukrainian Academy of Sciences, Sevastopol. Translated from Morskoi Gidrofizicheskii Zhurnal,
34–49, May–June, 2003. Original article submitted January 18, 2002; revision submitted April 11, 2002.
0928-5105/03/1303–0157 $25.00 © 2003 Plenum Publishing Corporation 157