Drivers and Potential Consequences of Observed Extreme Hypoxia Along the Canadian Pacific Continental Shelf

Author:

Franco Ana C.1ORCID,Ianson Debby12ORCID,Ross Tetjana2ORCID,Hannah Charles2ORCID,Sastri Akash23,Tortell Philippe D.14

Affiliation:

1. Department of Earth, Ocean and Atmospheric Sciences University of British Columbia Vancouver BC Canada

2. Institute of Ocean Sciences, Fisheries and Oceans Canada Sidney BC Canada

3. Department of Biology University of Victoria Victoria BC Canada

4. Department of Botany University of British Columbia Vancouver BC Canada

Abstract

AbstractBottom waters of the northeast Pacific continental shelf naturally experience localized hypoxic conditions, with significant influences on food webs and biogeochemical cycling. In August 2021, extreme hypoxia was detected from several measurement platforms along the southern British Columbia continental shelf, with oxygen concentration <60 μmol kg−1, and a difference from the seasonal climatology of more than 2 standard deviations. Early and intense remote upwelling and local density shifts were associated with an anomalously strong spring phytoplankton bloom, which likely stimulated localized respiration of subsurface organic matter. This event was concurrent with unsuitable habitat for Pacific halibut and calcite and aragonite undersaturation throughout most of the water column. The drivers of this extreme low oxygen event could be enhanced under future climate change, with potentially significant impacts on marine ecology and biogeochemistry.

Publisher

American Geophysical Union (AGU)

Subject

General Earth and Planetary Sciences,Geophysics

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