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| Titel |
Regional scale characteristics of the seasonal cycle of chlorophyll in the Southern Ocean |
| VerfasserIn |
S. J. Thomalla, N. Fauchereau, S. Swart, P. M. S. Monteiro |
| 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 ; 8, no. 10 ; Nr. 8, no. 10 (2011-10-07), S.2849-2866 |
| Datensatznummer |
250006157
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| Publikation (Nr.) |
 copernicus.org/bg-8-2849-2011.pdf |
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| Zusammenfassung |
| In the Ocean, the seasonal cycle is the mode that couples climate forcing to
ecosystem response in production, diversity and carbon export. A better
characterisation of the ecosystem's seasonal cycle therefore addresses an
important gap in our ability to estimate the sensitivity of the biological
pump to climate change. In this study, the regional characteristics of the
seasonal cycle of phytoplankton biomass in the Southern Ocean are examined
in terms of the timing of the bloom initiation, its amplitude, regional
scale variability and the importance of the climatological seasonal cycle in
explaining the overall variance. The seasonal cycle was consequently defined
into four broad zonal regions; the subtropical zone (STZ), the transition
zone (TZ), the Antarctic circumpolar zone (ACZ) and the marginal ice zone
(MIZ). Defining the Southern Ocean according to the characteristics of its
seasonal cycle provides a more dynamic understanding of ocean productivity
based on underlying physical drivers rather than climatological biomass.
The response of the biology to the underlying physics of the different
seasonal zones resulted in an additional classification of four regions
based on the extent of inter-annual seasonal phase locking and the
magnitude of the integrated seasonal biomass. This regionalisation contributes towards an
improved understanding of the regional differences in the sensitivity of the
Southern Oceans ecosystem to climate forcing, potentially allowing more
robust predictions of the effects of long term climate trends. |
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