Near-equatorial low-oxygen extremes: Long-term time series of dissolved oxygen measurements from the upper 500 m depth of the eastern tropical North Atlantic
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2026
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| _version_ | 1867171902165876736 |
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| author | Schütte, Florian Schulz, Marco Brandt, Peter Hahn, Johannes |
| author_facet | Schütte, Florian Schulz, Marco Brandt, Peter Hahn, Johannes |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Long-term time series of dissolved oxygen (DO) measurements from the upper 500 m depth of the eastern tropical North Atlantic (ETNA), collected over a period of up to 15 years at three different mooring sites, reveal recurring extreme low-oxygen events lasting for several weeks. Similarly, observations from 15 individual meridional ship sections between 6°N and 12°N along 23°W show DO concentrations far below 60 µmol kg⁻¹ in the upper 200 m - significantly lower than the climatological values at this depth (>80 µmol kg⁻¹). Two-third of these low-oxygen events could be related with high-baroclinic-mode vorticies (HBVs) with their cores located well below the mixed layer. Since none of the observed HBVs exhibit a surface signature, a substantial portion of the near-equatorial eddy field may remain undetected by satellites, yet still exert significant influence on local ocean ecosystems and biogeochemical cycles. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_987397 |
| institution | PANGAEA |
| language | en |
| publishDate | 2026 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Near-equatorial low-oxygen extremes: Long-term time series of dissolved oxygen measurements from the upper 500 m depth of the eastern tropical North Atlantic Schütte, Florian Schulz, Marco Brandt, Peter Hahn, Johannes Climate - Biogeochemistry Interactions in the Tropical Ocean; eddies; Oxygen; SFB754 Long-term time series of dissolved oxygen (DO) measurements from the upper 500 m depth of the eastern tropical North Atlantic (ETNA), collected over a period of up to 15 years at three different mooring sites, reveal recurring extreme low-oxygen events lasting for several weeks. Similarly, observations from 15 individual meridional ship sections between 6°N and 12°N along 23°W show DO concentrations far below 60 µmol kg⁻¹ in the upper 200 m - significantly lower than the climatological values at this depth (>80 µmol kg⁻¹). Two-third of these low-oxygen events could be related with high-baroclinic-mode vorticies (HBVs) with their cores located well below the mixed layer. Since none of the observed HBVs exhibit a surface signature, a substantial portion of the near-equatorial eddy field may remain undetected by satellites, yet still exert significant influence on local ocean ecosystems and biogeochemical cycles. |
| title | Near-equatorial low-oxygen extremes: Long-term time series of dissolved oxygen measurements from the upper 500 m depth of the eastern tropical North Atlantic |
| topic | Climate - Biogeochemistry Interactions in the Tropical Ocean; eddies; Oxygen; SFB754 |
| url | https://doi.org/10.1594/PANGAEA.987397 |