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| Titel |
Climate-mediated changes to mixed-layer properties in the Southern Ocean: assessing the phytoplankton response |
| VerfasserIn |
P. W. Boyd, S. C. Doney, R. Strzepek, J. Dusenberry, K. Lindsay, I. Fung |
| 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 ; 5, no. 3 ; Nr. 5, no. 3 (2008-05-19), S.847-864 |
| Datensatznummer |
250002526
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| Publikation (Nr.) |
 copernicus.org/bg-5-847-2008.pdf |
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| Zusammenfassung |
| Concurrent changes in ocean chemical and physical properties influence
phytoplankton dynamics via alterations in carbonate chemistry, nutrient and
trace metal inventories and upper ocean light environment. Using a fully
coupled, global carbon-climate model (Climate System Model 1.4-carbon), we
quantify anthropogenic climate change relative to the background natural
interannual variability for the Southern Ocean over the period 2000 and
2100. Model results are interpreted using our understanding of the
environmental control of phytoplankton growth rates – leading to two major
findings. Firstly, comparison with results from phytoplankton perturbation
experiments, in which environmental properties have been altered for key
species (e.g., bloom formers), indicates that the predicted rates of change
in oceanic properties over the next few decades are too subtle to be
represented experimentally at present. Secondly, the rate of secular climate
change will not exceed background natural variability, on seasonal to
interannual time-scales, for at least several decades – which may not
provide the prevailing conditions of change, i.e. constancy, needed for
phytoplankton adaptation. Taken together, the relatively subtle
environmental changes, due to climate change, may result in adaptation by
resident phytoplankton, but not for several decades due to the confounding
effects of climate variability. This presents major challenges for the
detection and attribution of climate change effects on Southern Ocean
phytoplankton. We advocate the development of multi-faceted tests/metrics
that will reflect the relative plasticity of different phytoplankton
functional groups and/or species to respond to changing ocean conditions. |
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