The fate of phosphate in an in situ Lagrangian addition experiment in the Eastern Mediterranean

The fate of phosphate in an in situ Lagrangian addition experiment in the Eastern Mediterranean

The Eastern Mediterranean is the largest oceanic ecosystem that is phosphate-limited. To determine the impact of a transient input we executed a phosphate addition experiment in the surface waters of the Cyprus Eddy (33.3°N 32.3°E), and compared the ecosystem response with surrounding unperturbed wa...

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Veröffentlicht in:Deep-sea research. Part II, Topical studies in oceanography Topical studies in oceanography, 2005-01, Vol.52 (22), p.2911-2927
Hauptverfasser: Law, C.S., Abraham, E.R., Woodward, E.M.S., Liddicoat, M.I., Fileman, T.W., Thingstad, T.F., Kitidis, V., Zohary, T.
Format: Artikel
Sprache:eng
Schlagworte:
Bacteria
Diffusion
Dilution
Eastern Mediterranean
Marine
Phosphate
Phosphate enrichment
Phytoplankton
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Zusammenfassung:The Eastern Mediterranean is the largest oceanic ecosystem that is phosphate-limited. To determine the impact of a transient input we executed a phosphate addition experiment in the surface waters of the Cyprus Eddy (33.3°N 32.3°E), and compared the ecosystem response with surrounding unperturbed water. A tracer, sulphur hexafluoride (SF 6), added with the phosphate, enabled tracking of the patch when phosphate concentration declined to detection limits, and provided quantitative estimates of mixing, dilution and patch volume. The patch expanded to >400 km 2 over 9 days with a lateral diffusion rate of 23±2 m 2/s that was consistent with previous tracer releases in eddies. Mixed layer phosphate concentration was ∼110 nmol/l immediately post-release, and declined to
ISSN:0967-0645
1879-0100
DOI:10.1016/j.dsr2.2005.08.017