Widespread and increasing near-bottom hypoxia in the coastal ocean off the United States Pacific Northwest.

Autor: Barth JA; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, 97331, USA. jack.barth@oregonstate.edu., Pierce SD; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, 97331, USA., Carter BR; Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Seattle, WA, 98115, USA.; Cooperative Institute for Climate, Ocean, and Ecosystem Studies, Seattle, WA, 98105, USA., Chan F; Department of Integrative Biology, Oregon State University, Corvallis, OR, 97331, USA.; Cooperative Institute for Marine Ecosystem and Resources Studies, Oregon State University, Newport, OR, 97365, USA., Erofeev AY; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, 97331, USA., Fisher JL; Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA, 98112, USA., Feely RA; Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Seattle, WA, 98115, USA., Jacobson KC; Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA, 98112, USA., Keller AA; Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA, 98112, USA., Morgan CA; Cooperative Institute for Marine Ecosystem and Resources Studies, Oregon State University, Newport, OR, 97365, USA., Pohl JE; Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA, 98112, USA., Rasmuson LK; Oregon Department of Fish and Wildlife, Newport, OR, 97365, USA., Simon V; Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA, 98112, USA.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 Feb 15; Vol. 14 (1), pp. 3798. Date of Electronic Publication: 2024 Feb 15.
DOI: 10.1038/s41598-024-54476-0
Abstrakt: The 2021 summer upwelling season off the United States Pacific Northwest coast was unusually strong leading to widespread near-bottom, low-oxygen waters. During summer 2021, an unprecedented number of ship- and underwater glider-based measurements of dissolved oxygen were made in this region. Near-bottom hypoxia, that is dissolved oxygen less than 61 µmol kg -1 and harmful to marine animals, was observed over nearly half of the continental shelf inshore of the 200-m isobath, covering 15,500 square kilometers. A mid-shelf ribbon with near-bottom, dissolved oxygen less than 50 µmol kg -1 extended for 450 km off north-central Oregon and Washington. Spatial patterns in near-bottom oxygen are related to the continental shelf width and other features of the region. Maps of near-bottom oxygen since 1950 show a consistent trend toward lower oxygen levels over time. The fraction of near-bottom water inshore of the 200-m isobath that is hypoxic on average during the summer upwelling season increases over time from nearly absent (2%) in 1950-1980, to 24% in 2009-2018, compared with 56% during the anomalously strong upwelling conditions in 2021. Widespread and increasing near-bottom hypoxia is consistent with increased upwelling-favorable wind forcing under climate change.
(© 2024. The Author(s).)
Databáze: MEDLINE
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