A study of long-term changes in Black Sea ecosystems based on data assimilation of remote measurements in a numerical model

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Abstract

Herein, we present a simulation of the dynamics of Black Sea ecosystems using a three-dimensional interdisciplinary model that assimilates satellite color scanner measurements. Calculations were performed for the fifteen years from 1998 and a set of 3-d biogeochemical fields of the Black Sea were generated on a regular grid with a discreteness time of 1 day. Analyses of core biogeochemical parameters of the marine ecosystem were then performed. The qualities of received fields were evaluated using comparisons with existing data from in situ measurements.

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About the authors

V. L. Dorofeev

Marine Hydrophysical Institute, Russian Academy of Sciences

Author for correspondence.
Email: l.sukhikh@gmail.com
Russian Federation, 2A, Kapitanskaya street, Sevastopol, 299011

L. I. Sukhikh

Marine Hydrophysical Institute, Russian Academy of Sciences

Email: l.sukhikh@gmail.com
Russian Federation, 2A, Kapitanskaya street, Sevastopol, 299011

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Supplementary files

Supplementary Files
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2. Fig. 1. The variability of the average annual biomass of phytoplankton (a) and zooplankton (b) in the upper 50-meter layer of water in the Black Sea, calculated from the simulation results for the period 1998–2012.

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3. Fig. 2. Graphs of changes in the average surface concentration of nitrates (a) and the average concentration in the upper 50-meter layer of water in the Black Sea, obtained from the simulation results (b).

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4. Fig. 3. Seasonal variation of the concentration of nitrates (a) and phytoplankton in the upper layer of the sea (b), obtained from the simulation results. I – XII - months of the year.

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5. Fig. 4. Climatic profiles of the distribution of the average concentrations of nitrates (a, b) and phytoplankton (c, d). Profiles (a) and (c) correspond to the deep-water part of the Black Sea, (b) and (d) - to the north-western shelf.

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6. Fig. 5. Climatic distributions of surface concentration of nitrates for four seasons.

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7. Fig. 6. Climatic distributions of phytoplankton surface concentration for four seasons.

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8. Fig. 7. Zonal nitrate concentration distributions for four seasons.

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9. Fig. 8. Zonal phytoplankton concentration distributions for four seasons.

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10. Fig. 9. Places for measurement of oxygen concentration (gray circles), nitrates (triangles) and chlorophyll-a (squares). The line inside the Black Sea basin - isobata 200 m.

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11. Fig. 10. Oxygen concentration profiles obtained from measurement data (solid line) and corresponding profiles obtained from modeling results (dashed line) for the deep-water part of the sea (a) and szSh (c) b and g are the corresponding profiles of the mean deviation (solid line) and standard deviation (dashed line).

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12. Fig. 11. Nitrate concentration profiles obtained from measurements (solid line) and corresponding profiles obtained from modeling results (dashed line) for the deep-water part of the sea (a) and szSh (c) b and g are the corresponding profiles of the mean deviation (solid line) and standard deviation (dashed line).

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13. Fig. 12. Chlorophyll concentration profiles, mg / m3, obtained from measurements (solid line), and corresponding profiles obtained from modeling results (dashed line) for the deep-water part of the sea (a); corresponding profiles of mean deviation (solid line) and standard deviation (dotted line) (b).

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