System controls of coastal and open ocean oxygen depletion

Deoxygenation; Eutrophication; Global warming; Respiration; Stratification; Ventilation; Biogeochemical process; Coastal environments; Continental shelves; Controlling process; Human activities; Influence on climate; Oxygen concentrations; Oxygen depletion; Aquatic Science; Geology

Abstract :

[en] The epoch of the Anthropocene, a period during which human activity has been the dominant influence on climate and the environment, has witnessed a decline in oxygen concentrations and an expansion of oxygen-depleted environments in both coastal and open ocean systems since the middle of the 20th century. This paper provides a review of system-specific drivers of low oxygen in a range of case studies representing marine systems in the open ocean, on continental shelves, in enclosed seas and in the coastal environment. Identification of similar and contrasting responses within and across system types and corresponding oxygen regimes is shown to be informative both in understanding and isolating key controlling processes and provides a sound basis for predicting change under anticipated future conditions. Case studies were selected to achieve a balance in system diversity and global coverage. Each case study describes system attributes, including the present-day oxygen environment and known trends in oxygen concentrations over time. Central to each case study is the identification of the physical and biogeochemical processes that determine oxygen concentrations through the tradeoff between ventilation and respiration. Spatial distributions of oxygen and time series of oxygen data provide the opportunity to identify trends in oxygen availability and have allowed various drivers of low oxygen to be distinguished through correlative and causative relationships. Deoxygenation results from a complex interplay of hydrographic and biogeochemical processes and the superposition of these processes, some additive and others subtractive, makes attribution to any particular driver challenging. System-specific models are therefore required to achieve a quantitative understanding of these processes and of the feedbacks between processes at varying scales.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Pitcher, Grant C.; Fisheries Research and Development, Department of Forestry, Fisheries and the Environment, Cape Town, South Africa ; Department of Biological Sciences, University of Cape Town, South Africa

Aguirre-Velarde, Arturo; Dirección General de Investigaciones en Acuicultura, Instituto del Mar del Perú (IMARPE), Callao, Peru

Breitburg, Denise; Smithsonian Environmental Research Center, Edgewater, United States

Cardich, Jorge; Programa de Maestría de Ciencias del Mar y proyecto Magnet (Fondecyt-UPCH), Lima, Peru

Carstensen, Jacob; Department of Bioscience, Aarhus University, Roskilde, Denmark

Conley, Daniel J.; Department of Geology, Lund University, Lund, Sweden

Dewitte, Boris; Laboratoire d'Etudes en Géophysique et Océanographie Spatiales- LEGOS, UMR5566 -CNRS/IRD/UT/CNES, Toulouse, France ; Centro de Estudios Avanzados en Zonas Áridas, La Serena, Chile ; Departamento de Biología Marina, Facultad de Ciencias del Mar, Universidad Católica del Norte, Coquimbo, Chile ; Millennium Nucleus for Ecology and Sustainable Management of Oceanic Islands (ESMOI), Coquimbo, Chile

Engel, Anja; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany

Espinoza-Morriberón, Dante; Dirección General de Investigaciones Oceanográficas y Cambio Climático, Instituto del Mar del Perú (IMARPE), Callao, Peru ; LOCEAN-IPSL, IRD/CNRS/Sorbonnes Universités (UPMC)/MNHN, UMR7159, Paris Cedex05, France

Flores, Georgina; Dirección General de Investigaciones Oceanográficas y Cambio Climático, Instituto del Mar del Perú (IMARPE), Callao, Peru

More authors (28 more)

Language :

English

Title :

System controls of coastal and open ocean oxygen depletion

Publication date :

September 2021

Journal title :

Progress in Oceanography

ISSN :

0079-6611

Publisher :

Elsevier Ltd

Volume :

197

Pages :

102613

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://api.elsevier.com/content/article/PII:S0079661121001002?httpAccept=text/xml

Funding text :

The undertaking of this review paper was an activity prioritized by the Global Ocean Oxygen Network (GO 2 NE) in an effort to synthesize our knowledge and to provide an inclusive perspective of the drivers of deoxygenation in both coastal and open ocean systems. We thank the IOC-UNESCO for initiating and supporting GO 2 NE. VG and BD acknowledge support from the EU H2020 FutureMARES project (Theme LC-CLA-06-2019, Grant N o 869300) and BD also acknowledges support from ANID (Grants R20F0008-CEAZA and 1190276).The undertaking of this review paper was an activity prioritized by the Global Ocean Oxygen Network (GO2NE) in an effort to synthesize our knowledge and to provide an inclusive perspective of the drivers of deoxygenation in both coastal and open ocean systems. We thank the IOC-UNESCO for initiating and supporting GO2NE. VG and BD acknowledge support from the EU H2020 FutureMARES project (Theme LC-CLA-06-2019, Grant No 869300) and BD also acknowledges support from ANID (Grants R20F0008-CEAZA and 1190276).

Data Set :

10.1016/j.pocean.2021.102613

Available on ORBi :

since 06 June 2022

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