Морской гидрофизический журнал. 2020; 36: 501-513
Исследование потоков компонентов морской экосистемы с северо-западного шельфа в глубоководную часть Черного моря
https://doi.org/10.22449/0233-7584-2020-5-501-513Аннотация
Цель. Представлен анализ особенностей переноса компонентов экосистемы Черного моря с северо-западного шельфа в глубоководную часть и зависимость этого переноса от характера циркуляции в верхнем слое моря.
Методы и результаты. Для расчета потоков массы жидкости, биогенов и биопродукции с шельфовой зоны в глубоководную часть моря использовались поля течений и биогеохимические поля, полученные в результате реанализа, выполненного с помощью модели экосистемы Черного моря с ассимиляцией данных дистанционных измерений как в численной модели циркуляции, так и в биогеохимическом блоке. С помощью численного моделирования были рассчитаны потоки через три сечения, ограничивающих шельфовую зону (у м. Калиакра, м. Херсонес и вдоль изобаты 200 м). Поведение струи Основного Черноморского течения, а следовательно, направление и величина потоков через границы северо-западного шельфа зависят от завихренности напряжения трения ветра над западной частью Черного моря. Для типа циркуляции с интенсивной струей Основного Черноморского течения, прижатой к кромке шельфа, характерна картина распределения поверхностной концентрации неорганического азота и фитопланктона в виде узкой полосы высоких значений вдоль западного и частично южного берегов Черного моря. Когда струя Основного Черноморского течения слаба или отходит от кромки шельфа, что соответствует невысоким значениям завихренности поля ветра, повышенные значения концентрации сосредоточены на северо-западном шельфе.
Выводы. Направление, величина и характер горизонтального распределения потоков биогенов и биопродукции определяются главным образом циркуляцией в верхнем слое моря. Существенное влияние на величину этих потоков оказывает разность концентраций биогенов и биопродукции в шельфовой зоне и в глубоководной части Черного моря.
Список литературы
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Morskoy Gidrofizicheskiy Zhurnal. 2020; 36: 501-513
Studying the Fluxes of the Marine Ecosystem Components from the Northwestern Shelf to the Deep Part of the Black Sea
https://doi.org/10.22449/0233-7584-2020-5-501-513Abstract
Purpose. The study represents analysis of the features of the Black Sea ecosystem components transfer from the northwestern shelf to the deep-sea part and its dependence on circulation in the sea upper layer.
Methods and Results. The fluxes of water mass, nutrients and bioproduction from the shelf zone to the deep part of the sea were calculated using the current fields and biogeochemical ones resulted from the reanalysis, which, in its turn, was carried out due to the Black Sea ecosystem model including assimilation of remote sensing data both in the numerical circulation model and in the biogeochemical block. Numerical modeling permitted to calculate the fluxes through three sections that bound the shelf zone (by the capes Kaliakra and Chersonesos, and along the 200 m isobath). Behavior of the RIM Current jet and, consequently, direction and magnitude of the flows through the boundaries of the northwestern shelf depend on the wind stress vorticity over the western part of the Black Sea. The type of circulation with the intense RIM Current jet pressed to the shelf edge, is characterized by the pattern of distribution of the inorganic nitrogen and phytoplankton surface concentration as a narrow strip of its high values along the Black Sea western and partially southern coasts. When the RIM Current jet is weak or moves from the shelf edge (that corresponds to the low values of the wind stress vorticity) the increased concentration values are located on the northwestern shelf.
Conclusions. Direction, magnitude and character of horizontal distribution of the nutrient and bioproduction fluxes are determined mainly by circulation in the sea upper layer. The magnitude of these flows is significantly affected by difference between the nutrient and bioproduction concentrations in the shelf zone and in the deep part of the Black Sea.
References
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5. Modelling the Danube-influenced north-western continental shelf of the Black Sea. II: Ecosystem response to changes in nutrient delivery by the Danube River after its damming in 1972 / C Lancelot [et al.] // Estuarine, Coastal and Shelf Science. 2002. Vol. 54, iss. 3. P. 473–499. doi:10.1006/ecss.2000.0659
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