Spreading of Lagrangian Particles in the Black Sea: A Comparison between Drifters and a High-Resolution Ocean Model
The Lagrangian dispersion statistics of the Black Sea are estimated using satellite-tracked drifters, satellite altimeter data and a high-resolution ocean model. Comparison between the in-situ measurements and the model reveals good agreement in terms of the surface dispersion. The mean sub-basin co...
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| Format: | Article |
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MDPI AG
2021-07-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/13/13/2603 |
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| author | Maher Bouzaiene Milena Menna Dalila Elhmaidi Ahmad Fehmi Dilmahamod Pierre-Marie Poulain |
| author_facet | Maher Bouzaiene Milena Menna Dalila Elhmaidi Ahmad Fehmi Dilmahamod Pierre-Marie Poulain |
| author_sort | Maher Bouzaiene |
| collection | DOAJ |
| description | The Lagrangian dispersion statistics of the Black Sea are estimated using satellite-tracked drifters, satellite altimeter data and a high-resolution ocean model. Comparison between the in-situ measurements and the model reveals good agreement in terms of the surface dispersion. The mean sub-basin coherent structures and currents of the Black Sea are well reproduced by the model. Seasonal variability of the dispersion in the upper (15 m), intermediate (150 m) and deep (750 m) layers are discussed with a special focus of the role of sub-basin scale structures and currents on the turbulent dispersion regimes. In terms of the surface relative dispersion, the results show the presence of the three known turbulent exponential, Richardson and diffusive-like regimes. The non-local exponential regime is only detected by the model for scales <10 km, while the local Richardson regime occurs between 10 and 100 km in all cases due to the presence of an inverse energy cascade range, and the diffusive-like regime is well detected for the largest distance by drifters (100–300 km) in winter/spring. Regarding the surface absolute dispersion, it reflects the occurrence of both quasi-ballistic and random-walk regimes at small and large times, respectively, while the two anomalous hyperbolic (5/4) and elliptic (5/3) regimes, which are related to the topology of the Black Sea, are detected at intermediate times. At depth, the signatures of the relative and absolute dispersion regimes shown in the surface layer are still valid in most cases. The absolute dispersion is anisotropic; the zonal component grows faster than the meridional component in any scenario. |
| first_indexed | 2024-03-10T09:50:25Z |
| format | Article |
| id | doaj.art-fbeeb852f964447cbad9c407a64b38a7 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T09:50:25Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-fbeeb852f964447cbad9c407a64b38a72023-11-22T02:49:43ZengMDPI AGRemote Sensing2072-42922021-07-011313260310.3390/rs13132603Spreading of Lagrangian Particles in the Black Sea: A Comparison between Drifters and a High-Resolution Ocean ModelMaher Bouzaiene0Milena Menna1Dalila Elhmaidi2Ahmad Fehmi Dilmahamod3Pierre-Marie Poulain4Thermal Radiation Laboratory, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis 2092, TunisiaDivision of Oceanography, National Institute of Oceanography and Applied Geophysics, Borgo Grotta Gigante 42/c, 34010 Sgonico (TS), ItalyThermal Radiation Laboratory, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis 2092, TunisiaDepartment of Oceanography, Dalhousie University, Halifax, NS B3H 4R2, CanadaDivision of Oceanography, National Institute of Oceanography and Applied Geophysics, Borgo Grotta Gigante 42/c, 34010 Sgonico (TS), ItalyThe Lagrangian dispersion statistics of the Black Sea are estimated using satellite-tracked drifters, satellite altimeter data and a high-resolution ocean model. Comparison between the in-situ measurements and the model reveals good agreement in terms of the surface dispersion. The mean sub-basin coherent structures and currents of the Black Sea are well reproduced by the model. Seasonal variability of the dispersion in the upper (15 m), intermediate (150 m) and deep (750 m) layers are discussed with a special focus of the role of sub-basin scale structures and currents on the turbulent dispersion regimes. In terms of the surface relative dispersion, the results show the presence of the three known turbulent exponential, Richardson and diffusive-like regimes. The non-local exponential regime is only detected by the model for scales <10 km, while the local Richardson regime occurs between 10 and 100 km in all cases due to the presence of an inverse energy cascade range, and the diffusive-like regime is well detected for the largest distance by drifters (100–300 km) in winter/spring. Regarding the surface absolute dispersion, it reflects the occurrence of both quasi-ballistic and random-walk regimes at small and large times, respectively, while the two anomalous hyperbolic (5/4) and elliptic (5/3) regimes, which are related to the topology of the Black Sea, are detected at intermediate times. At depth, the signatures of the relative and absolute dispersion regimes shown in the surface layer are still valid in most cases. The absolute dispersion is anisotropic; the zonal component grows faster than the meridional component in any scenario.https://www.mdpi.com/2072-4292/13/13/2603Black Seadriftersmodeldispersionregimes |
| spellingShingle | Maher Bouzaiene Milena Menna Dalila Elhmaidi Ahmad Fehmi Dilmahamod Pierre-Marie Poulain Spreading of Lagrangian Particles in the Black Sea: A Comparison between Drifters and a High-Resolution Ocean Model Remote Sensing Black Sea drifters model dispersion regimes |
| title | Spreading of Lagrangian Particles in the Black Sea: A Comparison between Drifters and a High-Resolution Ocean Model |
| title_full | Spreading of Lagrangian Particles in the Black Sea: A Comparison between Drifters and a High-Resolution Ocean Model |
| title_fullStr | Spreading of Lagrangian Particles in the Black Sea: A Comparison between Drifters and a High-Resolution Ocean Model |
| title_full_unstemmed | Spreading of Lagrangian Particles in the Black Sea: A Comparison between Drifters and a High-Resolution Ocean Model |
| title_short | Spreading of Lagrangian Particles in the Black Sea: A Comparison between Drifters and a High-Resolution Ocean Model |
| title_sort | spreading of lagrangian particles in the black sea a comparison between drifters and a high resolution ocean model |
| topic | Black Sea drifters model dispersion regimes |
| url | https://www.mdpi.com/2072-4292/13/13/2603 |
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