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| Titel |
Mesoscale eddies modulate multiscale motions and transport deep-sea sediments |
| VerfasserIn |
Yanwei Zhang, Zhifei Liu, Yulong Zhao, Jianru Li |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250104945
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| Publikation (Nr.) |
 EGU/EGU2015-4389.pdf |
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| Zusammenfassung |
| Mesoscale eddies, which contribute to long-distance water mass transport and biogeochemical budget in the upper ocean, have recently been taken into assessment of the deep-sea hydrodynamic variability. Base on nearly 3-year measurements obtained by full-water column mooring systems located deeper than 2000 m in the northern South China Sea, we examine the influence of mesoscale eddies on the near-bottom currents and mixing as well as the cross-basin deepwater sediment transport process. Three southwestward-propagating mesoscale eddies with radius of ~150 km passed by our mooring sites. According to our multiple measurements, it clarifies that these deep-reaching surface-generated eddies result in enhanced subinertial motions in the deep sea, and ultimately lead to energy transfer from mesoscale to small-scale motions. For the first time we observed the deep-sea sediment transport process driven by mesoscale eddies, resulting in a total net southwestward sediment transport up to one million tons. Our findings confirm that the mesoscale eddies have played a significant role on the deepwater dynamic process and further in general on ocean circulation and ecological environment at great depth. |
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