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| Titel |
A comparative study of biological production in eastern boundary upwelling systems using an artificial neural network |
| VerfasserIn |
Z. Lachkar, N. Gruber |
| 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. 1 ; Nr. 9, no. 1 (2012-01-16), S.293-308 |
| Datensatznummer |
250006666
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| Publikation (Nr.) |
 copernicus.org/bg-9-293-2012.pdf |
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| Zusammenfassung |
| Eastern Boundary Upwelling Systems (EBUS) are highly productive ocean
regions. Yet, substantial differences in net primary production (NPP) exist
within and between these systems for reasons that are still not fully
understood. Here, we explore the leading physical processes and environmental
factors controlling NPP in EBUS through a comparative study of the
California, Canary, Benguela, and Humboldt Current systems. The NPP drivers
are identified with the aid of an artificial neural network analysis based on
self-organizing-maps (SOM). Our results suggest that in addition to the
expected NPP enhancing effect of stronger equatorward alongshore wind, three
factors have an inhibiting effect: (1) strong eddy activity, (2) narrow
continental shelf, and (3) deep mixed layer. The co-variability of these 4
drivers defines in the context of the SOM a continuum of 100 patterns of NPP
regimes in EBUS. These are grouped into 4 distinct classes using a
Hierarchical Agglomerative Clustering (HAC) method. Our objective
classification of EBUS reveals important variations of NPP regimes within
each of the four EBUS, particularly in the Canary and Benguela Current
systems. Our results show that the Atlantic EBUS are generally more
productive and more sensitive to upwelling favorable winds because of weaker
factors inhibiting NPP. Perturbations of alongshore winds associated with
climate change may therefore lead to contrasting biological responses in the
Atlantic and the Pacific EBUS. |
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