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

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Abstract

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
Volume125
Issue number8
Early online date22 Jun 2020
DOIs
Publication statusPublished - Aug 2020

Keywords

  • EBUS
  • Glider
  • Upwelling

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