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| Titel |
Regulation of phytoplankton carbon to chlorophyll ratio by light, nutrients and temperature in the Equatorial Pacific Ocean: a basin-scale model |
| VerfasserIn |
X. J. Wang, M. Behrenfeld, R. Borgne, R. Murtugudde, E. Boss |
| 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 ; 6, no. 3 ; Nr. 6, no. 3 (2009-03-17), S.391-404 |
| Datensatznummer |
250003533
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| Publikation (Nr.) |
 copernicus.org/bg-6-391-2009.pdf |
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| Zusammenfassung |
| The complex effects of light, nutrients and temperature lead to a variable
carbon to chlorophyll (C:Chl) ratio in phytoplankton cells. Using field data
collected in the Equatorial Pacific, we derived a new dynamic model with a
non-steady C:Chl ratio as a function of irradiance, nitrate, iron, and
temperature. The dynamic model is implemented into a basin-scale ocean
circulation-biogeochemistry model and tested in the Equatorial Pacific Ocean.
The model reproduces well the general features of phytoplankton dynamics in
this region. For instance, the simulated deep chlorophyll maximum (DCM) is
much deeper in the western warm pool (~100 m) than in the Eastern
Equatorial Pacific (~50 m). The model also shows the ability to
reproduce chlorophyll, including not only the zonal, meridional and vertical
variations, but also the interannual variability. This modeling study
demonstrates that combination of nitrate and iron regulates the spatial and
temporal variations in the phytoplankton C:Chl ratio in the Equatorial
Pacific. Sensitivity simulations suggest that nitrate is mainly responsible
for the high C:Chl ratio in the western warm pool while iron is responsible
for the frontal features in the C:Chl ratio between the warm pool and the
upwelling region. In addition, iron plays a dominant role in regulating the
spatial and temporal variations of the C:Chl ratio in the Central and Eastern
Equatorial Pacific. While temperature has a relatively small effect on the
C:Chl ratio, light is primarily responsible for the vertical decrease of
phytoplankton C:Chl ratio in the euphotic zone. |
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