News

Shallow marine ecosystem collapse and recovery during the Paleocene-Eocene Thermal Maximum

Abstract.

"The Paleocene-Eocene Thermal Maximum (PETM), the most well-studied transient hyperthermal event in Earth history, is characterized by prominent and dynamic changes in global marine ecosystems. Understanding such biotic responses provides valuable insights into future scenarios in the face of anthropogenic warming. However, evidence of the PETM biotic responses is largely biased towards deep-sea records, whereas shallow-marine evidence remains scarce and elusive. Here we investigate a shallow-marine microfaunal record from Maryland, eastern United States, to comprehensively document the shallow-marine biotic response to the PETM. We applied birth-death modeling to estimate the local diversity dynamics[...]"

 

Source: Elsevier
Authors: Skye Yunshu Tian  et al.
DOI: https://doi.org/10.1016/j.gloplacha.2021.103649

Read the full article here.


Deoxygenation in Marginal Seas of the Indian Ocean

Abstract.

"This article describes oxygen distributions and recent deoxygenation trends in three marginal seas – Persian Gulf and Red Sea in the Northwestern Indian Ocean (NWIO) and Andaman Sea in the Northeastern Indian Ocean (NEIO). Vertically mixed water column in the shallow Persian Gulf is generally well-oxygenated, especially in winter. Biogeochemistry and ecosystems of Persian Gulf are being subjected to enormous anthropogenic stresses including large loading of nutrients and organic matter, enhancing oxygen demand and causing hypoxia (oxygen < 1.4 ml l–1) in central and southern Gulf in summer. The larger and deeper Red Sea is relatively less affected by human[...]"

 

Source: Frontiers
Authors: S. Wajih A. Naqvi
DOI: https://doi.org/10.3389/fmars.2021.624322


Deoxygenation impacts on Baltic Sea cod: Dramatic declines in ecosystem services of an iconic keystone predator

Abstract.

"The intensified expansion of the Baltic Sea’s hypoxic zone has been proposed as one reason for the current poor status of cod (Gadus morhua) in the Baltic Sea, with repercussions throughout the food web and on ecosystem services. We examined the links between increased hypoxic areas and the decline in maximum length of Baltic cod, a demographic proxy for services[...]"

 

Source: Ambio
Authors: Alessandro Orio et al.
DOI: https://doi.org/10.1007/s13280-021-01572-4

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A committed fourfold increase in ocean oxygen loss

Abstract.

"Less than a quarter of ocean deoxygenation that will ultimately be caused by historical CO2 emissions is already realized, according to millennial-scale model simulations that assume zero CO2 emissions from year 2021 onwards. About 80% of the committed oxygen loss occurs below 2000 m depth, where a more sluggish overturning circulation will increase water residence times and accumulation of respiratory oxygen demand. According to the model results, the deep ocean will thereby lose more than 10% of its pre-industrial oxygen content even if CO2 emissions and thus global warming[...]"

 

Source: Nature Communications
Authors: Andreas Oschlies 
DOI: https://doi.org/10.1038/s41467-021-22584-4

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Glacial deep ocean deoxygenation driven by biologically mediated air–sea disequilibrium

Abstract.

"Deep ocean deoxygenation inferred from proxies has been used to support the hypothesis that a lower atmospheric carbon dioxide during glacial times was due to an increase in the strength of the ocean’s biological pump. This relies on the assumption that surface ocean oxygen (O2) is equilibrated with the atmosphere such that any O2 deficiency observed in deep waters is a result of organic matter respiration, which consumes O2 and produces dissolved inorganic carbon. However, this assumption has been shown to be imperfect because of disequilibrium. Here we used an Earth system[...]"

 

Source: Nature Geoscience 
Authors: Ellen Cliff et al.
DOI: https://doi.org/10.1038/s41561-020-00667-z

Read the full article here.


New Webinar Series on Ocean Deoxygenation

Do you want to know more about deoxygenation in the ocean?
Join us for the upcoming webinar!

Wednesday, 9th December 2020, 15:00 h – 16:00 h CET

The Global Ocean Oxygen Network (IOC Expert Working Group GO2NE) starts a new series on ocean deoxygenation. The second webinar will take place 9 December 2020. The speakers will present latest science on the impacts of reduced oxygen in the open ocean and coastal zones. Each webinar will feature two presentations by a more senior and an earlier-career scientist, 20 minutes each followed by 10 minutes moderated discussion sessions.

to register please click here.


New Webinar Series on Ocean Deoxygenation

New Webinar Series on Ocean Deoxygenation
Do you want to know more about deoxygenation in the ocean?
Join us for the upcoming webinar!

The Global Ocean Oxygen Network (IOC Expert Working Group GO2NE) starts a new series on ocean deoxygenation. The first webinar will take place 11 November 2020. The speakers will present latest science on the impacts of reduced oxygen in the open ocean and coastal zones. Each webinar will feature two presentations by a more senior and an earlier-career scientist, 20 minutes each followed by 10 minutes moderated discussion sessions.

When? Wednesday, 11th November 2020, 14:00 h – 15:00 h CET

To register please click here.


Physical Mechanisms Driving Oxygen Subduction in the Global

Abstract.

"Future changes in subduction are suspected to be critical for the ocean deoxygenation predicted by climate models over the 21st century. However, the drivers of global oxygen subduction have not been fully described or quantified. Here, we address the physical mechanisms responsible for the oxygen transport across the late‐winter mixed layer base and their relation with water mass formation. Up to 70% of the global oxygen uptake takes place during Mode Water subduction mostly in the Southern Ocean[...]"

 

Source: Advancing Earth and Space Science
Authors: Esther Portela et al.
DOI: https://doi.org/10.1029/2020GL089040

Read the full article here.

 

 


Coral reef survival under accelerating ocean deoxygenation

Abstract.

"Global warming and local eutrophication simultaneously lower oxygen (O2) saturation and increase biological O2 demands to cause deoxygenation. Tropical shallow waters, and their coral reefs, are particularly vulnerable to extreme low O2 (hypoxia) events. These events can drive mass mortality of reef biota; however, they currently remain unaccounted for when considering coral reef persistence under local environmental alterations and global climatic change. In this Perspective, we integrate existing biological, ecological and geochemical[...]"

 

Source: Nature Climate Change
Authors: David J. Hughes et al.
DOI: https://doi.org/10.1038/s41558-020-0737-9

Read the full article here.


Geoengineered Ocean Vertical Water Exchange Can Accelerate Global Deoxygenation

Abstract.

"Ocean deoxygenation is a threat to marine ecosystems. We evaluated the potential of two ocean intervention technologies, that is, “artificial downwelling (AD)” and “artificial upwelling (AU),” for remedying the expansion of Oxygen Deficient Zones (ODZs). The model‐based assessment simulated AD and AU implementations for 80 years along the eastern Pacific ODZ.[...]"

Source: Advancing Earth And Space Science 
Authors: Ellias Yuming Feng et al.
DOI: https://doi.org/10.1029/2020GL088263

Read the full article here.

 


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