Oxygen declines and the shoaling of the hypoxic boundary in the California Current
Open accessAbstract
We use hydrographic data from the California Cooperative Oceanic Fisheries Investigations program to explore the spatial and temporal variability of dissolved oxygen (DO) in the southern California Current System (CCS) over the period 1984–2006. Large declines in DO (up to 2.1 μ mol/kg/y) have been observed throughout the domain, with the largest relative DO declines occurring below the thermocline (mean decrease of 21% at 300 m). Linear trends were significant ( p < 0.05) at the majority of stations down to 500 m. The hypoxic boundary (∼60 μ mol/kg) has shoaled by up to 90 m within portions of the southern CCS. The observed trends are consistent with advection of low‐DO waters into the region, as well as decreased vertical oxygen transport following near‐surface warming and increased stratification. Expansion of the oxygen minimum layer could lead to cascading effects on benthic and pelagic ecosystems, including habitat compression and community reorganization.
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A long-term trend toward declining oxygen content in the southern California Current has been observed, with the hypoxic boundary (60 uM/kg) shoaling by up to 80 m over 1984-2006 in the Southern California Bight.
“A long-term trend toward declining oxygen content in the southern California Current has been observed, with the hypoxic boundary (defined as the depth at which dissolved oxygen is 60 uM/kg) shoaling by up to 80 m over the period 1984-2006 in the Southern California Bight [55,56].”
From Anticipated Effects of Climate Change on Coastal Upwelling Ecosystems (2015) · cites this paper as [55]
The Abstract reports declining dissolved oxygen in the southern California Current over 1984–2006. Section 3, paragraph 9, reports that the hypoxic boundary shoaled within the Southern California Bight, but gives a maximum of 90 m, not the claimed 80 m. (LLM, conf=0.90)
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Ocean Deoxygenation in a Warming World
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Self-citation
- Authors
- Bograd, S. J., Castro, C. G., Di Lorenzo, E., Palacios, D. M., Bailey, H., Gilly, W., & Chavez, F. P.
- Affiliations
- National Oceanic and Atmospheric Administration (US)
- Consejo Superior de Investigaciones Científicas (ES)
- School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta Georgia USA
- University of Hawaiʻi at Mānoa (US)
- Hopkins Marine Station (US)
- Monterey Bay Aquarium Research Institute Moss Landing California USA
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2008-06-28
- Volume
- 35
- Issue
- 12
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W1605138272
- Cited by
- 420
- References
- 2
- Citations by year
- 2026: 13 · 2025: 21 · 2024: 32 · 2023: 18 · 2022: 14 · 2021: 29 · 2020: 20 · 2019: 25 · 2018: 16 · 2017: 29 · 2016: 19 · 2015: 24 · 2014: 19 · 2013: 41 · 2012: 31
- FWCI
- 15.93
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Geophysical Research Letters (publishedVersion)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, other-oa)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
- Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
- Keywords
- dissolved oxygen depletion, oxygen minimum zone, California Current System, ocean deoxygenation, hypoxia, ocean warming, ocean stratification, ecosystem reorganization
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