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| Titel |
Spatial and temporal variability in nutrients and carbon uptake during 2004 and 2005 in the eastern equatorial Pacific Ocean |
| VerfasserIn |
A. P. Palacz, F. Chai |
| 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. 11 ; Nr. 9, no. 11 (2012-11-08), S.4369-4383 |
| Datensatznummer |
250007381
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| Publikation (Nr.) |
 copernicus.org/bg-9-4369-2012.pdf |
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| Zusammenfassung |
| The eastern equatorial Pacific plays a~great role in the global carbon budget
due to its enhanced biological productivity linked to the equatorial
upwelling. However, as confirmed by the Equatorial Biocomplexity cruises in
2004 and 2005, nutrient upwelling supply varies strongly, partly due to the
tropical instability waves (TIWs). The aim of this study was to examine patterns of
spatial and temporal variability in the biological uptake of NO3,
Si(OH)4 and carbon in this region, and to evaluate the role of
biological and physical interactions controlling this variability over
seasonal and intraseasonal time scales. Here, high resolution Pacific
ROMS–CoSiNE (Regional Ocean Modeling System–Carbon, Silicon, Nitrogen Ecosystem) model results were evaluated with in situ and remote sensing
data. The results of model–data comparison revealed a good agreement in
domain-average hydrographic and biological rate estimates, and patterns of
spatio-temporal variability in primary productivity. We confirmed that
TIWs have the potential to enhance phytoplankton
biomass through an increased supply of nutrients and elevated local and
instantaneous phytoplankton nutrient uptake as opposed to only advecting
biomass. Furthermore, we concluded that initial biological conditions
(e.g., zooplankton biomass) may play an important additional constraint on
biological responses, in particular of large phytoplankton such as diatoms,
to TIW-induced perturbations in the physical and biogeochemical fields and
fluxes. In order to fully resolve the complexity of biological and physical
interactions in the eastern equatorial Pacific, we recommended improving
CoSiNE and other models by introducing more phytoplankton groups, variable
Redfield and carbon to chlorophyll ratios, as well as resolving the Fe–Si
co-limitation of phytoplankton growth. |
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