News

Job Offer in ocean coupled physical-biogeochemical modelling

PhD or mobility postdoctoral position: "Predicting marine deoxygenation from earth observation data using machine learning."

"A 4-year PhD or a 2-year postdoctoral position is available at the Liège University (MAST group, Department of Astrophysics, Geophysics and Oceanography) to develop prediction tools of deoxygenation. The developed approach will combine earth observation (EO), ARGO and mechanistic model products with machine learning to predict coastal hypoxia and sub-surface oxycline variability. The position is offered in the frame of the “Multiple Threats on Ocean Health”(MiTHo) research project funded by the European Space Agency."

You can find more details in this document


Job Offer in ocean coupled physical-biogeochemical modelling

PhD or mobility postdoctoral position: "Projecting the Black Sea’s ecosystem and ecosystem services in a future climate. Trends, tipping points and resilience assessment."

"A 4-year PhD or 2-year postdoctoral position is available at the Liège University (MAST group, Department of Astrophysics, Geophysics and Oceanography) in collaboration with the Stockholm Resilience centre to perform and analyse regional climate model projections over the Black Sea.
The research project aims at performing an ensemble of model simulations of the physical and biogeochemical state of the Black Sea over different scenarios of atmospheric conditions and river discharges. The modelling system consists of a (one-way) coupled atmosphere-ocean model. The atmospheric model is the regional atmospheric model (MAR), the oceanographic model couples the Nucleus for European Modelling of the Ocean (NEMO) hydrodynamical model and the BiogeochemicAl Model for Hypoxic and Benthic Influenced areas (BAMHBI). The different components of the modelling system are run at the Liège University in the frame of European projects."

You can find more details in this document


Oxygenated deep waters fed early Atlantic overturning circulation upon Antarctic glaciation

Abstract.

"The Atlantic meridional overturning circulation (AMOC) exerts a major control on the global distribution of heat, dissolved oxygen and carbon in the ocean. Yet the timing and cause of the inception of this system and its evolution since the start of the Cenozoic Era 65 million years ago (Ma) remain highly uncertain. Here we present records of microbial source indicators based on glycerol dialkyl glycerol tetraether distributions from the Cenozoic Northwest Atlantic Ocean (~43‒18 Ma) and use them to infer changes in AMOC-driven deep-ocean oxygenation. [...]".

 

Source: Nature
Authors: Huanye Wang et al.
DOI: https://doi.org/10.1038/s41561-023-01292-2

Read the full article here.


Combined effects of ocean deoxygenation, acidification, and phosphorus limitation on green tide macroalga, Ulva prolifera

Abstract.

"Ocean deoxygenation, acidification, and decreased phosphorus availability are predicted to increase in coastal ecosystems under future climate change. However, little is known regarding the combined effects of such environmental variables on the green tide macroalga Ulva prolifera. Here, we provide quantitative and mechanistic understanding of the acclimation mechanisms of U. prolifera to ocean deoxygenation, acidification, and phosphorus limitation under both laboratory and semi-natural (mesocosms) conditions. [...]".

 

Source: Science Direct
Authors: Xintong Huang et al.
DOI: https://doi.org/10.1016/j.scitotenv.2023.164982

Read the full article here.


Preprint: Seasonality and response of ocean acidification and hypoxia to major environmental anomalies in the southern Salish Sea, North America ...

Full title: "Seasonality and response of ocean acidification and hypoxia to major environmental anomalies in the southern Salish Sea, North America (2014–2018)"

Abstract.

"Coastal and estuarine ecosystems fringing the North Pacific Ocean are particularly vulnerable to ocean acidification, hypoxia, and intense marine heatwaves as a result of interactions among natural and anthropogenic processes. Here we characterize variability during a seasonally resolved cruise time series in the southern Salish Sea (Puget Sound, Strait of Juan de Fuca) and nearby coastal waters for select physical (temperature, T; salinity, S) and biogeochemical [...]".

 

Source: Biogeosciences
Authors: Simone R. Alin et al.
DOI: https://doi.org/10.5194/bg-2023-181

Read the full article here.


Hands-on Hypoxia: Engaging High School Educators in the science behind Marine Microbial Dynamics in Hypoxic Coastal Areas ...

Full title: "Hands-on Hypoxia: Engaging High School Educators in the science behind Marine Microbial Dynamics in Hypoxic Coastal Areas Through Field and Classroom Experiences"

Abstract.

"The University of Southern California’s (USC) Joint Educational Project’s STEM Education Programs hosted a three-day summer workshop focused on marine microbiology and coastal deoxygenation for high school educators. To increase ocean literacy in high school students from Title I schools, topical marine science research was translated into four lesson plans appropriate for classrooms that teach biology and environmental science. [...]".

 

Source: Current Journal
Authors: Kyla J. Kelly et al.
DOI: https://doi.org/10.5334/cjme.86

Read the full article here.

 


Expansion of Ocean Anoxia During Glacial Periods Recorded in the Cobalt Flux to Pelagic Sediments

Abstract.

"The expansion of oxygen deficient zones (ODZs) within the ocean's interior is anticipated to be a major consequence of anthropogenic climate change, but past changes in ODZs are poorly defined. Recent mapping efforts have revealed plumes of the redox-active metal cobalt within ODZs, driving a basin-scale correlation between high cobalt and low O2. Here, we investigate the cobalt flux to Equatorial Pacific sediments along the Line Islands Ridge as a novel record of basin-scale fluctuations in ODZ extent. [...]".

 

Source: Wiley Online Library
Authors: Nicholas J. Hawco & Rhea K. Foreman
DOI: https://doi.org/10.1029/2023GL105135

Read the full article here.


Preprint: Unique ocean circulation pathways reshape the Indian Ocean oxygen minimum zone with warming

Abstract.

"The global ocean is losing oxygen with warming. Observations and Earth system model projections suggest, however, that this global ocean deoxygenation does not equate to a simple and systematic expansion of tropical oxygen minimum zones (OMZs). Previous studies have focused on the Pacific Ocean; they showed that the outer OMZ deoxygenates and expands as oxygen supply by advective transport weakens, the OMZ core oxygenates and contracts due to a shift in the composition of the source waters supplied by slow mixing, and in between these two regimes, oxygen is redistributed with little effect on OMZ volume. [...]".

 

Source: EGUsphere 
Authors: Sam Ditkovsky et al.
DOI: https://doi.org/10.5194/egusphere-2023-1082

Read the full article here.


GOBAI-O2: temporally and spatially resolved fields of ocean interior dissolved oxygen over nearly 2 decades

Abstract.

"For about 2 decades, oceanographers have been installing oxygen sensors on Argo profiling floats to be deployed throughout the world ocean, with the stated objective of better constraining trends and variability in the ocean's inventory of oxygen. Until now, measurements from these Argo-float-mounted oxygen sensors have been mainly used for localized process studies on air–sea oxygen exchange, upper-ocean primary production, biological pump efficiency, and oxygen minimum zone dynamics. Here, we present a new four-dimensional gridded product of ocean interior oxygen, derived via machine learning algorithms trained on dissolved oxygen [...]".

 

Source: Earth System Science Data
Authors: Jonathan D. Sharp et al.
DOI: https://doi.org/10.5194/essd-15-4481-2023

Read the full article here.


Paleoenvironmental significance of the carbon isotope record across the Cenomanian–Turonian transition and the Oceanic Anoxic Event 2 (OAE2) ...

Full title: "Paleoenvironmental significance of the carbon isotope record across the Cenomanian–Turonian transition and the Oceanic Anoxic Event 2 (OAE2) in the southeastern Neotethys, Zagros, Iran"

Abstract.

"A high–resolution carbon isotope record of pelagic carbonates (δ13Ccarb) from the Zagros Mountains, Iran, documents a 1.8‰ positive carbon isotope excursion (CIE) in the southeastern Neotethys during the Cenomanian–Turonian transition, corresponding to Ocean Anoxic Event (OAE2). The succession is controlled by biostratigraphy that includes the Rotalipora cushmani [...]".

 

Source: Science Direct
Authors: Borhan Bagherpour et al.
DOI: https://doi.org/10.1016/j.cretres.2023.105574

Read the full article here.


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