Abstract
AbstractGlider observations from the Northwestern Iberian Margin during the exceptionally strong 2010 summer upwelling season resolved the evolution of physical and biogeochemical variables during two upwelling events. Upwelling brought low‐oxygen Eastern North Atlantic Central Water from 190 m depth onto the shelf up to a depth of 50 m. During the two observed periods of upwelling, a poleward jet developed over the shelf break. The persistent upwelling favorable winds maintained equatorward flow on the outer shelf for 2 months with no reversals during relaxation periods, a phenomenon not previously observed. During upwelling, near‐surface chlorophyll a concentration increased by more than 6 mg m−3. Oxygen supersaturation in the near surface increased by more than 20%, 6 days after the chlorophyll a maximum.
Highlights
Eastern Boundary Upwelling Systems are some of the oceans’ most productive areas, covering less than 1 % of the ocean but accounting for up to 20 % of the global wild fish take (Pauly & Christensen, 1995)
Upwelling episodes boost productivity along the shelf break, increasing primary production by up to 50 % compared with open ocean values (Joint et al, 2002)
Chlorophyll concentrations increased after the development of full upwelling, coincident with the decrease in near surface temperature (Figure 7)
Summary
During upwelling decreasing temperature and increasing chlorophyll a concentration lead increasing dissolved oxygen concentration by 6 days. A glider observed two upwelling events during a 70 day deployment over the Northwestern Iberian Margin in summer 2010. Equatorward flow persisted over the shelf and upper slope throughout the deployment. This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to. Please cite this article as doi: differences between this version and the Version
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