Glider Observations of the Northwestern Iberian Margin During an Exceptional Summer Upwelling Season

• Published in: Journal of Geophysical Research: Oceans
• Main Authors: Rollo, Callum, Heywood, Karen J., Hall, Rob A., Barton, Eric D., Kaiser, Jan
• Format: Article in Journal/Newspaper
• Language: English
• Published: American Geophysical Union 2020
• Subjects: North Atlantic
• Online Access: http://hdl.handle.net/10261/220741; https://doi.org/10.1029/2019JC015804

15 pages, 9 figures.-- This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited Glider 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 190m 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 6mgm−3. Oxygen supersaturation in the near surface increased by more than 20%, 6 days after the chlorophyll a maximum. The glider deployment and investigators J. K. and K. J. H. were supported by NERC grant NE/H012532/1 Glider observations of productivity in the North Atlantic (GOPINA). Ship work by the RV Mytilus was funded through projects CAIBEX CTM2007‐66408‐C02‐01 (Plan Nacional, Spanish Ministry of Science and Education) and RAIA 0313 RAIA_1_E (INTERREG, European Union). C. R. was supported by the Natural Environment Research Council (Grant NE/N012070/1) and the Engineering and Physical Sciences Research Council, via the NEXUSS Centre of Doctoral Training in the Smart and Autonomous Observation of the Environment. Peer reviewed