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Preprint: ISASO2 : Recent trends and regional patterns of Ocean Dissolved Oxygen change

Abstract.

"Recent estimates of the global inventory of dissolved oxygen (DO) have suggested a decrease of 2 % since the 1960s. However, due to the sparse historical oxygen data coverage, the DO inventory exhibits large regional uncertainties at interannual timescale. Using ISASO2, a new DO Argo-based optimally interpolated climatology https://doi.org/10.17882/52367 (Kolodziejczyk et al.,2021), we have estimated an updated regional oxygen inventory. Over the long term (~1980–2013), comparing the ISASO2 Argo fields with the first guess WOA18 built from the DO bottle samples fields extracted from WOD18, the broad tendency to global ocean deoxygenation remains robust in the upper 2000 m with -451±243 Tmol per decade. [...]".

 

Source: Earth System Science Data
Authors: Nicolas Kolodziejczyk et al.
DOI: https://doi.org/10.5194/essd-2024-106

Read the full article here.


The Ocean's Meridional Oxygen Transport

Abstract.

"Quantification of oxygen uptake at the ocean surface and its surface-to-interior pathways is crucial for understanding oxygen concentration change in a warming ocean. We investigate the mean meridional global oxygen transport between 1950 and 2009 using coupled physical-biogeochemical model output. We introduce a streamfunction in latitude-oxygen coordinates to reduce complexity in the description of the mean meridional oxygen pathways. [...]".

 

Source: Wiley Online Library
Authors: Esther Portela et al.
DOI: https://doi.org/10.1029/2023JC020259

Read the full article here.


Chapter 13 - The crucial contribution of mixing to present and future ocean oxygen distribution

Abstract.

"The oxygen content of the ocean interior largely results from a balance between respiration and advective ventilation, with only a small contribution from mixing processes. However, two important characteristics, which are key to future oxygen distribution in the ocean, primarily depend on the strength of ocean mixing. The first relates to the oxygen minimum zones (OMZ), which are wide O2-deficient mesopelagic layers inhospitable to most marine macro-fauna. We illustrate how mixing intensity controls the volume[...]".

 

Source: Science Direct
Authors: Marina Lévy et al.
DOI: https://doi.org/10.1016/B978-0-12-821512-8.00020-7

Read the full article here.


Rapid ecosystem-scale consequences of acute deoxygenation on a Caribbean coral reef

Abstract.

"Loss of oxygen in the global ocean is accelerating due to climate change and eutrophication, but how acute deoxygenation events affect tropical marine ecosystems remains poorly understood. Here we integrate analyses of coral reef benthic communities with microbial community sequencing to show how a deoxygenation event rapidly altered benthic community composition and microbial assemblages in a shallow tropical reef ecosystem. Conditions associated with the event precipitated coral bleaching and mass mortality, causing a 50% loss of live coral and a shift in the benthic community that persisted a year later. Conversely, the unique taxonomic and functional profile of hypoxia-associated microbes rapidly reverted to a normoxic assemblage[...]".

 

Source: Nature Communications
Authors: Maggie D. Johnson et al.
DOI: https://doi.org/10.1038/s41467-021-24777-3

Read the full article here.


Fate of floating plastic debris released along the coasts in a global ocean model

Abstract.

"Marine plastic pollution is a global issue, from the shores to the open ocean. Understanding the pathway and fate of plastic debris is fundamental to manage and reduce plastic pollution. Here, the fate of floating plastic pollution discharged along the coasts is studied by comparing two sources, one based on river discharges and the other on mismanaged waste from coastal populations, using a Lagrangian numerical analysis in a global ocean circulation model. About 1/3 of the particles end up in the open ocean and 2/3 on beaches[...]"

 

Source: Science Direct
Authors: Fanny Chenillat et al.
DOI: https://doi.org/10.1016/j.marpolbul.2021.112116

Read the full article here.


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 

Read the full article here.


In oceanography, acoustics and hydrodynamics: An extended coupled (2+1)-dimensional Burgers system

Abstract.

"In oceanography, acoustics and hydrodynamics, people pay attention to the Burgers-type equations for different wave processes, one of which is an extended coupled (2+1)-dimensional Burgers system hereby under investigation. Based on the scaling transformation, Bell polynomials, Hirota operators and symbolic computation, we structure out two hetero-Bäcklund transformations, each of which to a solvable linear partial differential[...]"

 

Source: Science Direkt
Authors: Xin-YiGao et al.
DOI: https://doi.org/10.1016/j.cjph.2020.11.017

Read the full article here.


Paleocene-Eocene volcanic segmentation of the Norwegian-Greenland seaway reorganized high-latitude ocean circulation

Abstract.

"The paleoenvironmental and paleogeographic development of the Norwegian–Greenland seaway remains poorly understood, despite its importance for the oceanographic and climatic conditions of the Paleocene–Eocene greenhouse world. Here we present analyses of the sedimentological and paleontological characteristics of Paleocene–Eocene deposits (between 63 and 47 million years old) in northeast Greenland, and investigate key unconformities and volcanic facies observed through seismic reflection imaging in offshore basins.[...]"

 

Source: Communications Earth & Environment
Authors: Jussi Hovikoski et al.
DOI: https://doi.org/10.1038/s43247-021-00249-w

Read the full article here.


Ocean currents as a potential dispersal pathway for Antarctica’s most persistent non-native terrestrial insect

Abstract.

"The non-native midge Eretmoptera murphyi is Antarctica’s most persistent non-native insect and is known to impact the terrestrial ecosystems. It inhabits by considerably increasing litter turnover and availability of soil nutrients. The midge was introduced to Signy Island, South Orkney Islands, from its native South Georgia, and routes of dispersal to date have been aided by human activities, with little known about non-human-assisted methods of dispersal. This study is the first to determine the potential for dispersal of a terrestrial invertebrate species in Antarctica by combining physiological sea water tolerance data with quantitative assessments[...]"

 

Source: Polar Biology
Authors: Jesamine C. Bartlett  et al.
DOI: https://doi.org/10.1007/s00300-020-02792-2

Read the full article here.


The Thermodynamic Controls on Sulfide Saturation in Silicate Melts with Application to Ocean Floor Basalts

Abstract.

"A thermodynamic model to calculate the sulfide content at sulfide saturation or SCSS of basaltic and intermediate composition silicate melts has been built from four independently measurable thermodynamic entities, namely the standard state Gibbs free energy of the saturation reaction, the “sulfide capacity”, and the activities of FeO in[...]"

 

Source: AGU- Advancing Earth and Space Science 
Authors: Daniel R. Neuville et al.
DOI: https://doi.org/10.1002/9781119473206.ch10

Read the full article here. 


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