Biogeochemical drivers of changing hypoxia in the California Current Ecosystem

Dussin, R.; Curchitser, E.N.; Stock, C.A.; Van Oostende, N.

doi:10.1016/j.dsr2.2019.05.013

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Biogeochemical drivers of changing hypoxia in the California Current Ecosystem

2019
By Dussin, R. ; Curchitser, E.N. ; Stock, C.A. ; ...
Source: Deep Sea Research Part II: Topical Studies in Oceanography, 169-170, 104590 doi:10.1016/j.dsr2.2019.05.013

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Journal Title:

Deep-Sea Research Part Ii-Topical Studies in Oceanography
Personal Author:

Dussin, R. ; Curchitser, E.N. ; Stock, C.A. ; Van Oostende, N.

Dussin, R. ; Curchitser, E.N. ; Stock, C.A. ; Van Oostende, N. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; ESRL (Earth System Research Laboratory) ; GFDL (Geophysical Fluid Dynamics Laboratory) ; PSL (Physical Sciences Laboratory) ; ... More +

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; ESRL (Earth System Research Laboratory) ; GFDL (Geophysical Fluid Dynamics Laboratory) ; PSL (Physical Sciences Laboratory) ; NOS (National Ocean Service) ; OCM (Office for Coastal Management) ; NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center) ; CICSP (Cooperative Institute for Climate Science) Less -
Description:

Recent observations have revealed significant fluctuations in near-shore hypoxia in the California Current Ecosystem (CCE). These fluctuations have been linked to changes in the biogeochemical properties (e.g. oxygen and nutrient contents) of the oceanic source waters of the California Current upwelling, and projections suggest the potential for decreased oxygen and increased nutrients in the source water under climate change. We examine both the separate and combined influences of these projected changes through a sequence of perturbation experiments using a regional coupled ocean dynamics/biogeochemistry (BGC) model of the CCE. The direct effect of a projected 5% decline in source water oxygen is to expand the hypoxic area by 12.5% in winter to 22.5% in summer. This exceeds the impact of a + 0.5% nitrate enrichment of source waters, which expands the hypoxic area by 6.5% to 12% via stimulation of nearshore Net Primary Productivity (NPP), increased organic matter export, and subsequent enhanced remineralization and dissolved oxygen (DO) consumption at depth. The combined effect of these perturbations consistently surpasses the sum of the individual impacts, leading to 20% to 32% more hypoxic area. The combined biogeochemical impact greatly exceeds the response resulting from a 10% strengthening in upwelling-favorable winds (+ 1% in hypoxic area) or the decreased oxygen solubility associated with a 2 degrees C ocean warming (+ 3%). These results emphasize the importance of improved constraints on dynamic biogeochemical changes projected along the boundaries of shelf ecosystems. While such changes are often viewed as secondary impacts of climate change relative to local warming or stratification changes, they may prove dominant drivers of coastal ecosystem change.
Keywords:

[+]

21st-century Projections California Current Climate-change Continental Shelf Deoxygenation Formulation Hypoxia Intensification Iron Nutrient Ocean Oceanography Oregon Coastal Waters Oxygen System Upwelling
Source:

Deep Sea Research Part II: Topical Studies in Oceanography, 169-170, 104590 doi:10.1016/j.dsr2.2019.05.013
DOI:

https://doi.org/10.1016/j.dsr2.2019.05.013
Document Type:

Journal Article
Funding:

Grant no. NA-15OAR4310133 ; Grant no. NA-17OAR4310269

Grant no. NA-15OAR4310133 ; Grant no. NA-17OAR4310269 Less -
Place as Subject:

California ; Oregon

California ; Oregon Less -
Rights Information:

Accepted Manuscript
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:8a07340325496ab96c8de32a427980d0a2b7bdf85686181d6f80970254629b8e
Download URL:

https://repository.library.noaa.gov/view/noaa/29904/noaa_29904_DS1.pdf
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Biogeochemical drivers of changing hypoxia in the California Current Ecosystem

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