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| Titel |
Variations of net primary productivity and phytoplankton community composition in the Indian sector of the Southern Ocean as estimated from ocean color remote sensing data |
| VerfasserIn |
S. Takao, T. Hirawake, S. W. Wright, K. Suzuki |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 10 ; Nr. 9, no. 10 (2012-10-09), S.3875-3890 |
| Datensatznummer |
250007325
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| Publikation (Nr.) |
 copernicus.org/bg-9-3875-2012.pdf |
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| Zusammenfassung |
| Phytoplankton population dynamics play an important role in
biogeochemical cycles in the Southern Ocean during austral summer. Recent
environmental changes such as a rise in sea surface temperature (SST) are
likely to impact on net primary productivity (NPP) and phytoplankton
community composition. However, their spatiotemporal relationships are still
unclear in the Southern Ocean. Here we assessed the relationships between
NPP, dominant phytoplankton groups, and SST in the Indian sector of the
Southern Ocean over the past decade (1997–2007) using satellite
remote sensing data. As a result, we found a statistically significant
reduction in NPP in the polar frontal zone over the past decade during
austral summer. Moreover, the decrease in NPP positively correlated with the
dominance of diatoms (Kendall's rank correlation τ = 0.60)
estimated by a phytoplankton community composition model, but not
correlated with SST. In the seasonal ice zone, NPP correlated with not only
the dominance of diatoms positively (τ = 0.56), but also the
dominance of haptophytes (τ = −0.54) and SST (τ = −0.54)
negatively. Our results suggested that summer NPP values
were strongly affected by the phytoplankton community composition in the
Indian sector of the Southern Ocean. |
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