News
The early Toarcian Oceanic Anoxic Event (Jenkyns Event) in the Alpine-Mediterranean Tethys, north African margin...
Full title: "The early Toarcian Oceanic Anoxic Event (Jenkyns Event) in the Alpine-Mediterranean Tethys, north African margin, and north European epicontinental seaway"
Abstract.
"The early Toarcian Oceanic Anoxic Event (Jenkyns Event) was associated with major world-wide climatic changes with profound effects on the global carbon cycle. This review revisits the available literature covering the Jenkyns Event applying an updated common stratigraphic definition, allowing illustration of the development and evolution of anoxia in the Alpine-Mediterranean Tethys [...]".
Source: Science Direct
Authors: Gabriele Gambacorta et al.
DOI: https://doi.org/10.1016/j.earscirev.2023.104636
Interactive effects of ocean deoxygenation and acidification on a coastal fish Sillago japonica in early life stages
Abstract.
"Acidification and deoxygenation are major threats to ocean environments. Despite the possibilities of their co-occurrence, little is known about their interactive effects on marine organisms. The effects of low pH and low dissolved oxygen (DO) on the early life stages of the coastal fish Sillago japonica were investigated. Twenty-five experimental treatments fully crossed in five levels of pH 7.6–8.1 and DO 50–230 μmol/kg (20–100 % saturation degree) were tested, and hatching rate of the embryos and survivability of the larvae after 24 h at 25 °C were investigated. [...]".
Source: Science Direct
Authors: Makiko Yorifuji et al.
DOI: https://doi.org/10.1016/j.marpolbul.2023.115896
Cold-Water Coral Reefs in the Oxygen Minimum Zones Off West Africa
Abstract.
"The discoveries of large reefs within cold-water coral mound provinces revealed that the West African margin is a coral hotspot area in the Atlantic Ocean. The most striking observation is that cold-water corals thrive in extensive oxygen minimum zones under extreme conditions. This points to a wide tolerance of cold-water corals in these regions to low oxygen concentrations. The coral mound provinces off Mauritania, Angola, and Namibia, which are located in the centre of the local oxygen minimum zones, were selected as key study areas, and their regional oceanographic, bio-ecological, and geo-morphological settings are described in detail. [...]".
Source: Springer Nature
Authors: Claudia Wienberg et al.
DOI: https://doi.org/10.1007/978-3-031-40897-7_8
A Reconstructing Model Based on Time–Space–Depth Partitioning for Global Ocean Dissolved Oxygen Concentration
Abstract.
"Dissolved oxygen (DO) is essential for assessing and monitoring the health of marine ecosystems. The phenomenon of ocean deoxygenation is widely recognized. Nevertheless, the limited availability of observations poses a challenge in achieving a comprehensive understanding of global ocean DO dynamics and trends. The study addresses the challenge of unevenly distributed Argo DO data by developing time–space–depth machine learning (TSD-ML), a novel machine learning-based model designed to enhance reconstruction accuracy in data-sparse regions. [...]".
Source: MDPI
Authors: Zhenguo Wang et al.
DOI: https://doi.org/10.3390/rs16020228
GO2NE Webinar on Ocean Deoxygenation
GO2NE Webinar on Ocean Deoxygenation.
"Do you want to know more about deoxygenation in the ocean?
Join us for the upcoming webinar!
Monday, 21st February 2024, 14:00 h – 15:00 CET
Please join the Global Ocean Oxygen Network (IOC Expert Working Group GO2NE) for a new session of its webinar series on ocean deoxygenation. The 27th webinar will take place 21 February 2024, 14:00 h CET. 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:
Natalya Gallo
University of Bergen and Bjerknes Centre for Climate Research, Norway
Speakers:
Martine Røysted Solås
University of Bergen and Bjerknes Centre for Climate Research, Norway
"Vertical distribution of mesopelagic scattering layers under different oxygen conditions: Insights from a western Norwegian fjord"
Carl Reddin
GeoZentrum Nordbayern, Germany - Paleobiology, and Integrative Ecophysiology at AWI, Germany
"Warming-associated deoxygenation as a driver of marine extinction? The deep past and near future"
If you want to receive further information about upcoming webinars please register here."
Start Date: 2/21/24
Job Offer in Geomicrobiology/ Environmental Microbiology
PhD position at the Ludwig-Maximilians-Universität München
"The Department of Earth and Environmental Sciences at LMU Munich invites applications for one PhD position in Geomicrobiology/ Environmental Microbiology to experimentally investigate the diversity and activity of marine microbial communities in the context of ocean deoxygenation.
Together with warming and acidification, ocean deoxygenation is considered one of the three major impacts of climate change in global oceans according to IPCC, and a main research scientific topic for organizations such as UNESCO or IUCN. In the DFG Emmy-Noether Research Group in Biogeochemistry and Climate Change, we investigate the effects of ocean deoxygenation on dissolved organic matter (DOM) sequestration, due to interactions with microbial communities and the marine carbon and sulfur cycles. By combining field work experiments with state-of-art laboratory techniques from different disciplines, we aim to decipher new links between microbes and DOM, in the context of a changing, deoxygenated ocean."
You can find more details here.
GOOD News Issue 4
Can green hydrogen production be used to mitigate ocean deoxygenation? A scenario from the Gulf of St. Lawrence
Abstract.
"Ocean deoxygenation and expansion and intensification of hypoxia in the ocean are a major, growing threat to marine ecosystems. Measures currently used to protect marine biodiversity (e.g., marine protected areas) are ineffective in countering this threat. Here, we highlight the example of the Gulf of St. Lawrence in eastern Canada, where oxygen loss is not only due to eutrophication (which can be mitigated by nutrient controls) but also is a consequence of ocean circulation change and warming. Climate-related loss of oxygen will be an increasingly widespread source of risk to marine biodiversity over this century. [...]".
Source: Springer Nature
Authors: Douglas W. R. Wallace et al.
DOI: https://doi.org/10.1007/s11027-023-10094-1
High-frequency dynamics of pH, dissolved oxygen, and temperature in the coastal ecosystems of the Tanga-Pemba Seascape...
Full title: "High-frequency dynamics of pH, dissolved oxygen, and temperature in the coastal ecosystems of the Tanga-Pemba Seascape: implications for upwelling-enhanced ocean acidification and deoxygenation"
Abstract.
"Ocean acidification, deoxygenation, and warming are three interconnected global change challenges caused by increased anthropogenic carbon emissions. These issues present substantial threats to marine organisms, ecosystems, and the survival of coastal communities depending on these ecosystems. Coastal upwelling areas may experience significant [...]".
Source: Frontiers in Marine Science
Authors: Rushingisha George et al.
DOI: https://doi.org/10.3389/fmars.2023.1286870
Editorial: Constraining uncertainties in hindcasts and future projections of marine deoxygenation
Abstract.
"Ocean deoxygenation is a key stressor for marine ecosystems and biogeochemical cycles (Gruber, 2011; Breitburg et al., 2018). Climate projections based on Earth system models (ESMs) suggest that the global oxygen inventory will undergo a significant decline over the next century under persistent greenhouse gas emissions (Bopp et al., 2013; Kwiatkowski et al., 2020). Oxygen minimum zones (OMZs) located close to productive eastern boundary upwelling systems (EBUSs) and the Arabian Sea may expand or shift in spatial extent dramatically, thereby impacting regional marine habitats (Stramma et al., 2012) and ecosystem services (Lachkar et al., 2023). [...]".
Source: Frontiers in Marine Science
Authors: Masahito Shigemitsu et al.
DOI: https://doi.org/10.3389/fmars.2023.1355015
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