GO₂NE Webinar on Ocean Deoxygenation. 

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

Monday, 19th June 2023, 15:00 h – 16:00 CEST

Registration link

Please join the Global Ocean Oxygen Network (IOC Expert Working Group GO2NE) for a new session of its webinar series on ocean deoxygenation. The 20th webinar will take place 19 June 2023, 15:00 h CEST. The webinar will feature presentations by a more senior and an early-career scientist, 20 minutes each followed by 10 minutes moderated discussion sessions. 

If you are interested to present at one of the upcoming webinars please submit a short abstract here.

Moderation: 
Andreas Oschlies
GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany

Speakers:
Patricia Handmann
Lhyfe, France
"Potential Environmental Services of Offshore Hydrogen Production - Ocean Reoxygenation"

Bo Gustafsson
Stockholm University Baltic Sea Centre, Stockholm, Sweden
"Mitigation of eutrophication and oxygen depletion in the Baltic Sea; challenges for science and management" 

If you want to receive further information about upcoming webinars please register here." 

"Please save the date for the online launch webinar of the new European Marine Board Future Science Brief 10 on “Ocean Oxygen: The role of the Ocean in the oxygen we breathe and the threat of deoxygenation”. A dedicated online launch will be on Tuesday 13 June at 14:00-15:30 CEST. 

The webinar will include a presentation of the document and its main messages, and a panel discussion on the issue of Ocean deoxygenation and the commonly used sentence “every second breath comes from the Ocean”, including an opportunity for Q&A. You can find more information about the webinar including a draft agenda here and register for the webinar via this link: https://us06web.zoom.us/webinar/register/WN_5JIwzuZ9SViRuH44ETuaPw."

The EMB Future Science Brief on Ocean Oxygen can be found here: https://marineboard.eu/publications/ocean-oxygen.

"On behalf of the 'Global Ocean Oxygen Database and Atlas’ steering committee we are very happy to share a short survey (10 questions, less than 10 minutes).

Ocean oxygen data are a critical part to understand our ocean today and in the future. However, currently there is no common entry point to obtain ocean oxygen data of known quality from the open and coastal ocean, measured from Eulerian and Lagrangian platforms. Within the Ocean Decade Programme 'Global Ocean Oxygen Decade' (GOOD) an effort called 'Global Ocean Oxygen Database and ATlas' (GO2DAT) is trying to change this.

This survey is the first step to implement GO2DAT. We count on your cooperation to identify who, where and how ocean oxygen is measured, what type of quality checks and flags are applied. This information will be indispensable to have ocean oxygen data complying with the FAIR and CARE principles.

Please submit your response by 30 June 2023."

Abstract.

"Oxygen-deficient marine waters referred to as oxygen minimum zones (OMZs) or anoxic marine zones (AMZs) are common oceanographic features. They host both cosmopolitan and endemic microorganisms adapted to low oxygen conditions. Microbial metabolic interactions within OMZs and AMZs drive coupled biogeochemical cycles resulting in nitrogen loss and climate active trace gas production and consumption. Global warming is causing oxygen-deficient waters to expand and intensify. [...]".

Source: Nature
Authors: Julia Anstett et al.
DOI: https://doi.org/10.1038/s41597-023-02222-y

Read the full article here.

Abstract. 

"Loss of oxygen in the ocean is accelerating and threatening the coral reef ecosystem. In this study, the impacts of hypoxia on the scleractinian coral Pocillopora damicornis were explored. The algal symbiont density, chlorophyll a + c2 content, energy consumption of corals, as well as energy available and consumption of their symbionts, decreased significantly post hypoxia stress. Meanwhile, the malondialdehyde contents in corals and symbionts, together with the caspase-3 activation level in corals, increased significantly in response to hypoxia stress. [...]".

Source: Science Direct
Authors: Kaidian Zhang et al.
DOI: https://doi.org/10.1016/j.marpolbul.2023.114897

Read the full article here.

Abstract. 

"It is commonly known that phytoplankton have a pivotal role in marine biogeochemistry and ecosystems as carbon fixers and oxygen producers, but their response to deoxygenation has scarcely been studied. Nonetheless, in the major oceanic oxygen minimum zones (OMZs), all surface phytoplankton groups, regardless of size, disappear and are replaced by unique cyanobacteria lineages below the oxycline. To develop reasonable hypotheses to explain this pattern, we conduct a review of available information on OMZ phytoplankton, and we re-analyze previously published data (flow cytometric and hydrographic) [...]". 

Source: Wiley Online Library
Authors: Jane C. Y. Wong et al.
DOI: https://doi.org/10.1002/lno.12367

Read the full article here.

Abstract. 

"Oceanic Anoxic Events (OAEs) are important geological events that may be analogues to future climate-driven deoxygenation of our oceans. Much of the global ocean experienced anoxic conditions during the Cenomanian–Turonian OAE (OAE2; ∼94 Ma), whereas the Western Interior Seaway (WIS) experienced oxygenation at this time. Here, organic geochemical and palynological data generated from Cenomanian–Turonian age sediments from five sites in the WIS are used to investigate changing redox and ecological conditions across differing palaeoenvironments and palaeolatitudes. [...]".

Source: Science Direct
Authors: Libby J. Robinson et al.
DOI: https://doi.org/10.1016/j.palaeo.2023.111496

Read the full article here.

Abstract. 

"The timing and causation of the Capitanian (late Middle Permian) biocrisis remain controversial. Here, a detailed uranium-isotopic (δ238U) profile was generated for the mid-Capitanian to lower Wuchiapingian of the Penglaitan section (the Guadalupian/Lopingian Permian global stratotype) in South China for the purpose of investigating relationships between the biocrisis and coeval oceanic anoxic events (OAEs). Negative δ238U excursions indicate two distinct OAEs, a mid-Capitanian (OAE-C1) and an end-Capitanian (OAE-C2) event. [...]".

Source: Science Direct
Authors: Huyue Song et al.
DOI: https://doi.org/10.1016/j.epsl.2023.118128

Read the full article here.

Abstract. 

"Oceanic anoxic events (OAEs) are considered as periods of oxygen deficiency in many oceans; accompanied by accumulation of organic-rich black shales. Mesozoic anoxic events were recognized based on the presence of black shales that are rich in organic matter. The most significant anoxic events during the Mesozoic are the Early Toarcian, the Early Aptian, and the Cenomanian–Turonian. The less significant events are the Valanginian-Hauterivian, the Hauterivian-Barremian, the Aptian-Albian, the Late Albian, the Albian-Cenomanian, and the Coniacian-Santonian. [...]".

Source: Springer Nature
Authors: Tarek Anan & Adam El-Shahat 
DOI: https://doi.org/10.1007/978-3-030-95637-0_7

Read the full article here.

Abstract. 

"The Cenomanian-Turonian (Late Cretaceous) climate warming was closely coupled to profound perturbations of biogeochemical cycles and ecosystems. The occurrence of organic matter-rich sediments across various depositional environments of the proto-North Atlantic hereby marks severe oxygen-deficient conditions, culminating in Oceanic Anoxic Event (OAE 2) at the Cenomanian/Turonian boundary. Here we combine bulk, isotope and molecular geochemical techniques to characterize trends in organic matter accumulation and its relationship to biogeochemical cycling (nitrogen, carbon) and marine phytoplankton community shifts [...]". 

Source: Science Direct
Authors: Wolfgang Ruebsam & Lorenz Schwark
DOI: https://doi.org/10.1016/j.gloplacha.2023.104117

Read the full article here.