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| Titel |
Variation of the Kuroshio nutrient stream in the East China Sea during 1987-2009 |
| VerfasserIn |
X.-H. Zhu, X. Guo, Q.-S. Wu |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250058466
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| Zusammenfassung |
| Using in situ data from 88 cruises from 1987 to 2009 in the East China Sea, downstream
nutrient transport by the Kuroshio was examined. The absolute geostrophic velocity was first
obtained inversely by assuming conservation of mass and salt within five isopycnal
layers in an enclosed area. The nutrient flux density (the product of velocity and the
nutrient concentration) was then calculated at a section across the Kuroshio. The
presence of a maximum nutrient flux density in the middle layer was confirmed
for the section across the Kuroshio in the East China Sea. Its temporal variations
were further investigated. Seasonal variation in the nutrient flux density was not
significant and was much smaller than interannual variations. The change in the
magnitude of the Kuroshio’s speed and the change in the current structure were major
causes for interannual variations in the nutrient flux density. The total downstream
nitrate flux transported by the Kuroshio in the East China Sea had a mean value of
170.8 kmol/s. Seasonally, it ranged from ~160 to ~177 kmol/s and interannually,
it varied from ~100 to ~280 kmol/s. The phosphate flux can be approximately
estimated by the ratio (13.64) of nitrate concentration to phosphate concentration. |
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