Intermediate water masses, a major supplier of oxygen for the eastern tropical Pacific ocean

Duteil, Olaf; Frenger, Ivy; Getzlaff, Julia

doi:10.5194/os-2020-17

Cited by 1 publication

(1 citation statement)

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“…This physical contribution to the rate of change of oxygen is considered an order of magnitude greater than changes attributed to biogeochemical processes (Montes et al, 2014). Observations of slight oxygenation of waters near the OMZ core off Southern Peru suggest a source of ventilation associated with the deeper Intermediate Antarctic Waters, though the regional significance of this trend needs to be confirmed and the potential mechanism further studied (Duteil et al, 2020). In the OMZ of the ETNA, long-term changes were attributed to a decline in core concentrations and an increase in the vertical extent of the OMZ (Stramma et al, 2008).…”

Section: Open Oceanmentioning

confidence: 93%

System controls of coastal and open ocean oxygen depletion

Pitcher

Aguirre-Velarde

Breitburg

et al. 2021

Progress in Oceanography

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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 oxygendepleted 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.

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Section: Open Oceanmentioning

confidence: 93%