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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5454

Title: Role of open ocean boundary forcing on seasonal to decadal-scale variability and long-term change of natural shelf hypoxia
Authors: Monteiro, PMS
Dewitte, B
Scranton, MI
Paulmier, A
Van der Plas, AK
Keywords: Natural shelf hypoxia
Carbon production
Benguela
Humboldt
Cariaco
Biogeochemical fluxes
Upwelling systems
Oceans
Issue Date: 2011
Publisher: Institute of Physics
Citation: Monteiro, PMS, Dewitte, B et al. 2011. Role of open ocean boundary forcing on seasonal to decadal-scale variability and long-term change of natural shelf hypoxia. Environmental Research Letters, Vol 6(2), pp 18
Series/Report no.: Workflow request;7130
Abstract: In this study the authors investigate the possible reasons for the widespread differences between the seasonal cycles of carbon production and export compared to those of hypoxia in eastern boundary upwelling systems. An idealized model is proposed that qualitatively characterizes the relative roles of physics and biogeochemical fluxes. The model is tested on three contrasting upwelling systems: the Benguela (from relatively aerated to interannual anoxic), the Humboldt (sub-oxic and interannually anoxic) and the Cariaco (permanently anoxic). Overall they propose that shelf hypoxia variability can be explained on the basis of the interaction between ventilation by ocean boundary forcing through ocean–shelf exchange and the role of shelf geometry in the retention of shelf-based particulate organic carbon (POC) fluxes. They aim to identify the hypoxia regimes associated with low ventilation—wide-shelf systems and high ventilation—narrow-shelf systems, considering them as extremes of conditions controlled by the two factors. They propose that this may help to explain differences in the seasonal cycles of the biogeochemical drivers and responses as well as difference between upwelling systems and within individual upwelling systems. It is suggested that when seasonal hypoxia emerges it does so preferentially at a wide-shelf part of a system.
Description: Copyright: 2011 Institute of Physics
URI: http://iopscience.iop.org/1748-9326/6/2/025002/pdf/1748-9326_6_2_025002.pdf
http://hdl.handle.net/10204/5454
ISSN: 1748-9326
Appears in Collections:Accessibility research
Climate change
Coastal and marine systems
Ecosystems processes & dynamics
General science, engineering & technology

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