Glider observations of the Northwestern Iberian Margin during an exceptional summer upwelling season

Callum Rollo, Karen J. Heywood, Rob A. Hall, Eric Desmond Barton, Jan Kaiser

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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 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.

Original languageEnglish
Article numbere2019JC015804
JournalJournal of Geophysical Research: Oceans
Issue number8
Early online date22 Jun 2020
Publication statusPublished - Aug 2020


  • EBUS
  • Glider
  • Upwelling

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