Carbon Dioxide Flux at the Water–Air Boundary at the Continental Slope in the Kara Sea     

Polukhin  A. A.  Flint  M. V.  Belikov  I. B.  Gusak  G. V.  Kazakova  U. A.  Muravya  V. O.  Pankratova  N. V.  Pronina  Yu. O.  Skorokhod  A. I.  Chultsova  A. L.  Shchuka  A. S. 《Oceanology》2021,61(5):625-631

Oceanology - The values and direction of carbon dioxide flux in the area of the continental slope in the north of the Kara Sea (St. Anna Trough) are calculated based on field studies in 2020 within...  相似文献   

First Data on the Structure of Phytoplankton Communities of the East Siberian Sea     

Sukhanova  I. N.  Flint  M. V.  Fedodov  A. V.  Sakharova  E. G.  Makkaveev  P. N.  Polukhin  A. A.  Nedospasov  A. A.  Schuka  A. S. 《Oceanology》2021,61(6):909-929

Oceanology - Research on the structure of phytoplankton communities of the East Siberian Sea has been carried out during the 69th cruise of the research vessel Akademik Mstislav Keldysh within the...  相似文献   

Transformation of suspended particulate matter into sediment in the Kara Sea in September of 2011     

A. Yu. Lein  P. N. Makkaveev  A. S. Savvichev  M. D. Kravchishina  N. A. Belyaev  O. M. Dara  M. S. Ponyaev  E. E. Zakharova  A. G. Rozanov  M. V. Ivanov  M. V. Flint 《Oceanology》2013,53(5):570-606

The biogeochemical processes participating in the transformation of the particulate matter into sediment along the Yenisei River-St. Anna Trough (Kara Sea) meridional profile were studied using hydrochemical, geochemical, microbiological, radioisotope, and isotope methods. The water-sediment contact zone consists of three subzones: the suprabottom water, the fluffy layer, and the surface sediment. The total number, biomass, and integral activity of the microorganisms (dark ¹⁴CO₂ assimilation) in the fluffy layer are usually higher than in the suprabottom water and sediment. The fluffy layer shows a decrease in the oxygen content and the growth of the dissolved biogenic elements. It was provided by the particulate organic matter supporting the vital activity of the heterotrophs from the overlying water column and by the flux of reduced compounds (NH₄, H₂S, CH₄, Fe²⁺, Mn²⁺, and others) from the underlying sediments. The C_org isotopic composition of the fluffy layer and the sediments is 2–4 ‰ heavier than that of the particulate matter and sediment due to the presence of the isotopically heavy biomass of microorganisms. A change in the isotopic composition of the C_org in the fluffy layer and surface sediment as compared to the C_org of the particulate matter is a widespread phenomenon in the Arctic shelf seas and proves the leading role of microorganisms in the transformation of the particulate matter into sediment.  相似文献   

Limnology of Lake Rerewhakaaitu     

M. A. Chapman  V. H. Jolly  E. A. Flint 《新西兰海洋与淡水研究杂志》2013,47(2):207-224

The limnology of Lake Rerewhakaaitu (36°18'S, 176° 30'E) was studied at various intervals between 1971 and 1974; comparisons were made between the main lake (area 6.32 km², mean depth 7 m, maximum depth 15 m), and the smaller (0.15 km²) and deeper (mean depth 15 m, maximum 31 m) crater which are connected by a narrow, 1 m deep channel. The main lake was usually homothermal, although temporary stratification periodically occurred, and the oxygen content of the deeper water could be as low as 2 g.m^‐3. The crater showed strong thermal and chemical stratification persisting well into the winter. Its heat budget and other factors related to lake stability are compared with those of some other New Zealand lakes. The failure of the crater to become fully re‐oxygenated during its brief period of homothermy is believed to be related to its morphometry, since the amount of phytoplankton did not appear to be great enough to explain the low levels of dissolved oxygen in the hypolimnion. The hypolimnetic oxygen deficit in 1973–74 was 0.038 mg. cm^‐2.day^‐1. Qualitatively the phytoplankton, usually dominated by desmids, was characteristic of oligotrophic waters, but quantitatively the main lake could be rated as mesotrophic. Differences were also found in the abundance of zooplankton between the crater and the main lake: there were usually more Bosmina but considerably fewer Ceriodaphnia in the main lake which had greater numbers of Piona. Adult Calamoecia were generally more abundant in the crater.  相似文献   

Biogeochemical processes of carbon and sulfur cycles in sediments of the outer shelf of the Black Sea (Russian Sector)     

Lein  A. Yu.  Rusanov  I. I.  Zakharova  E. E.  Flint  M. V.  Ivanov  M. V. 《Doklady Earth Sciences》2010,432(1):687-689

Within the mass of recent (unit-I) and ancient Black Sea (unit-II) sediments on the outer shelf of the Russian sector of the Black Sea, the rates of anoxic processes participating in diagenetic transformations of carbon and sulfur compounds were first measured using ³⁵S and ¹⁴C radioactive tracers. The main energy source for biogeochemical processes in (unit-I) sediments is the organic matter (OM) supplied to the bottom from the water mass. In (unit-II) sediments, this is methane in a migratory form proved by the excess of its oxidation rate over that of its generation. In recent silt, the primary microbial process is sulfate reduction; in unit-II, this is methane anoxic oxidation by the consortium of archeides and sulfate reductants. The organic matter produced in methane oxidation, in turn, acts as an energy source for the community of anaerobic heterotrophic microorganisms in the bottom sediments, which are remote from the water-sediment interface.  相似文献