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

Barth, John A.; Pierce, Stephen D.; Carter, Brendan R.; Chan, Francis; Erofeev, Anatoli Y.; Fisher, Jennifer L.; Feely, Richard A.; Jacobson, Kym C.; Keller, Aimee A.; Morgan, Cheryl A.; Pohl, John E.; Rasmuson, Leif K.; Simon, Victor

doi:10.1038/s41598-024-54476-0

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

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

2024
By Barth, John A. ; Pierce, Stephen D. ; Carter, Brendan R. ; ...
Source: Scientific Reports, 14(1)

[PDF-2.38 MB]

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Journal Title:

Scientific Reports
Personal Author:

Barth, John A. ; Pierce, Stephen D. ; Carter, Brendan R. ; Chan, Francis ; Erofeev, Anatoli Y. ; ... More +

Barth, John A. ; Pierce, Stephen D. ; Carter, Brendan R. ; Chan, Francis ; Erofeev, Anatoli Y. ; Fisher, Jennifer L. ; Feely, Richard A. ; Jacobson, Kym C. ; Keller, Aimee A. ; Morgan, Cheryl A. ; Pohl, John E. ; Rasmuson, Leif K. ; Simon, Victor Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; CICOES (Cooperative Institute for Climate, Ocean and Ecosystem Studies) ; CIMERS (Cooperative Institute for Marine Ecosystem and Resources Studies) ; NMFS (National Marine Fisheries Service) ; ... More +

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; CICOES (Cooperative Institute for Climate, Ocean and Ecosystem Studies) ; CIMERS (Cooperative Institute for Marine Ecosystem and Resources Studies) ; NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center) Less -
Description:

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.
Source:

Scientific Reports, 14(1)
DOI:

https://doi.org/10.1038/s41598-024-54476-0
ISSN:

2045-2322
Format:

PDF
Publisher:

Springer Science and Business Media LLC
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by/4.0/
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:188a46acb15305d4477fe26e36ed1477ba97d9fb87d23a1104265c1758cb3226
Download URL:

https://repository.library.noaa.gov/view/noaa/61159/noaa_61159_DS1.pdf
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Widespread and increasing near-bottom hypoxia in the coastal ocean off the United States Pacific Northwest

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