# A comparative study of biological production in eastern boundary upwelling systems using an artificial neural network

Author(s) Lachkar, Zouhair, Gruber, Nicolas
Publication Type Journal Items, Publication Status: Published
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Title A comparative study of biological production in eastern boundary upwelling systems using an artificial neural network
Author(s) Lachkar, Zouhair
Gruber, Nicolas
Journal or Series Title Biogeosciences
Volume Number 9
Issue Number 1
Start Page 293
End Page 308
ISSN 1726-4170
1726-4189
Publisher Copernicus
Publication Place Katlenburg-Lindau
Publication Date 2012
Abstract 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 identification of NPP drivers is done with the aid of an artificial neural network analysis based on self-organizing-maps (SOMs). We show that in addition to the expected NPP enhancing effect of stronger 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 a 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.
DOI 10.5194/bg-9-293-2012
Additional Notes Received 22 September 2011, Published in Biogeosciences Discuss. 4 October 2011, Revised 26 December 2011, Accepted 5 January 2012, Published 16 January 2012
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
Organisational Unit(s)
NEBIS System Number 006289717
Source Database ID FORM-1326802944
WOS-000300229000021
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@article{Lchkr2012,
author = "Lachkar, Zouhair and Gruber, Nicolas",
title = "{A} comparative study of biological production in eastern boundary upwelling systems using an artificial neural network",
journal = "Biogeosciences",
year = 2012,
volume = "9",
number = "1",
pages = "293--308",
}


E-Citations record created: Tue, 17 Jan 2012, 12:22:30 CET