Oceanographic processes driving low-oxygen conditions inside Patagonian fjords

  1. Linford, Pamela
  2. Pérez-Santos, Iván
  3. Montero, Paulina
  4. Díaz, Patricio A.
  5. Aracena, Claudia
  6. Pinilla, Elías
  7. Barrera, Facundo
  8. Castillo, Manuel
  9. Alvera-Azcárate, Aida
  10. Alvarado, Mónica
  11. Soto, Gabriel
  12. Pujol, Cécile
  13. Schwerter, Camila
  14. Arenas-Uribe, Sara
  15. Navarro, Pilar
  16. Mancilla-Gutiérrez, Guido
  17. Altamirano, Robinson
  18. San Martín, Javiera
  19. Soto-Riquelme, Camila

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1000 Titel
  • Oceanographic processes driving low-oxygen conditions inside Patagonian fjords
1000 Autor/in
  1. Linford, Pamela |
  2. Pérez-Santos, Iván |
  3. Montero, Paulina |
  4. Díaz, Patricio A. |
  5. Aracena, Claudia |
  6. Pinilla, Elías |
  7. Barrera, Facundo |
  8. Castillo, Manuel |
  9. Alvera-Azcárate, Aida |
  10. Alvarado, Mónica |
  11. Soto, Gabriel |
  12. Pujol, Cécile |
  13. Schwerter, Camila |
  14. Arenas-Uribe, Sara |
  15. Navarro, Pilar |
  16. Mancilla-Gutiérrez, Guido |
  17. Altamirano, Robinson |
  18. San Martín, Javiera |
  19. Soto-Riquelme, Camila |
1000 Verlag
  • Copernicus Publications
1000 Erscheinungsjahr 2024
1000 Publikationstyp
  1. Artikel |
1000 Online veröffentlicht
  • 2024-03-20
1000 Erschienen in
1000 Quellenangabe
  • 21(6):1433-1459
1000 Copyrightjahr
  • 2024
1000 Lizenz
1000 Verlagsversion
  • https://doi.org/10.5194/bg-21-1433-2024 |
1000 Publikationsstatus
1000 Begutachtungsstatus
1000 Sprache der Publikation
1000 Abstract/Summary
  • <jats:p>Abstract. The dissolved oxygen (DO) levels of coastal ocean waters have decreased over the last few decades in part because of the increase in surface and subsurface water temperature caused by climate change, the reduction in ocean ventilation, and the increase in stratification and eutrophication. In addition, biological and human activity in coastal zones, bays, and estuaries has contributed to the acceleration of current oxygen loss. The Patagonian fjord and channel system is one world region where low-DO water (LDOW, 30 %–60 % oxygen saturation) and hypoxia conditions (&lt;30 % oxygen saturation, 2 mL L−1 or 89.2 µmol L−1) are observed. An in situ dataset of hydrographic and biogeochemical variables (1507 stations), collected from sporadic oceanographic cruises between 1970 and 2021, was used to evaluate the mechanisms involved in the presence of LDOW and hypoxic conditions in northern Patagonian fjords. Results denoted areas with LDOW and hypoxia coinciding with the accumulation of inorganic nutrients and the presence of salty and oxygen-poor Equatorial Subsurface Water mass. The role of biological activity in oxygen reduction was evident in the dominance of community respiration over gross primary production. This study elucidates the physical and biogeochemical processes contributing to hypoxia and LDOW in the northern Patagonian fjords, highlighting the significance of performing multidisciplinary research and combining observational and modeling work. This approach underscores the importance of a holistic understanding of the subject, encompassing both real-world observations and insights provided by modeling techniques. </jats:p>
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