Paleocene-Eocene volcanic segmentation of the Norwegian-Greenland seaway reorganized high-latitude ocean circulation
"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.
Impacts of Ocean Currents on the South Indian Ocean Extratropical Storm Track through the Relative Wind Effect
"This study examines the role of the relative wind (RW) effect (wind relative to ocean current) in the regional ocean circulation and extratropical storm track in the south Indian Ocean. Comparison of two high-resolution regional coupled model simulations with and without the RW effect reveals that the most conspicuous ocean circulation response is the significant weakening of the overly energetic anticyclonic standing eddy off Port Elizabeth, South Africa, a biased feature ascribed to upstream retroflection of the Agulhas Current (AC).[...]"
Source: AMS- American Meteorological Sciety
Authors: Hyodae Seo et al.
Ocean currents as a potential dispersal pathway for Antarctica’s most persistent non-native terrestrial insect
"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.
The Thermodynamic Controls on Sulfide Saturation in Silicate Melts with Application to Ocean Floor Basalts
"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.
Recent Developments in Oxygen Minimum Zones Biogeochemistry
New Research Topic: Recent Developments in Oxygen Minimum Zones Biogeochemistry
"Oxygen minimum zones (OMZs) play a key role in carbon, nitrogen and other elemental cycles, and directly impact climate dynamics by influencing air-sea fluxes of the potent greenhouse gases methane and nitrous oxide. Oxygen concentrations, catalyze specialized micro-organisms to regulate chemical fluxes, which are critical for ecosystem functioning. The degree of deoxygenation in the OMZs vary from hypoxic in the tropical Atlantic Ocean to functionally anoxic in the eastern tropical Pacific Ocean and the northern Indian Ocean.[...]"
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Effect of environmental history on the habitat-forming kelp Macrocystis pyrifera responses to ocean acidification and warming: a physiological and mol
"The capacity of marine organisms to adapt and/or acclimate to climate change might differ among distinct populations, depending on their local environmental history and phenotypic plasticity. Kelp forests create some of the most productive habitats in the world, but globally, many populations have been negatively impacted by multiple anthropogenic stressors. Here, we compare the physiological and molecular responses to ocean acidification (OA) and warming (OW) of two populations of the giant kelp[...]"
Source: Nature Scientific Reports
Authors: Pamela A. Fernández et al.
Constraint on net primary productivity of the global ocean by Argo oxygen measurements
"The biological transformation of dissolved inorganic carbon to organic carbon during photosynthesis in the ocean, marine primary production, is a fundamental driver of biogeochemical cycling, ocean health and Earth’s climate system. The organic matter created supports oceanic food webs, including fisheries, and is an essential control on atmospheric carbon dioxide levels. Marine primary productivity is sensitive to changes due to climate forcing, but observing the response at the global scale[...]"
Source: Nature Geoscience
Authors: Kenneth S. Johnson et al.
Transferring Complex Scientific Knowledge to Useable Products for Society: The Role of the Global Integrated Ocean Assessment and Challenges in the
Effective Delivery of Ocean Knowledge
"The ocean provides essential services to human wellbeing through climate regulation, provision of food, energy and livelihoods, protection of communities and nurturing of social and cultural values. Yet despite the ocean’s key role for all life, it is failing as a result of unsustainable human practices. The first global integrated assessment of the marine environment, produced by the United Nations under The Regular Process for Global Reporting and Assessment of the State of the Marine Environment, including Socioeconomic Aspects (the World Ocean Assessment), identified an overall decline in ocean health. The second assessment, launched in April 2021, although recognising some bright spots and improvements, stresses ongoing decline in the ocean[...]"
Authors: Karen Evans et al.
Oxygen loss in fjords, coastal areas, and open ocean systems
"Loss of oxygen and expansion of oxygen depleted environments have been witnessed in both coastal and open-ocean systems since the middle of the 20th century, and ocean modelling predicts continuing decease by the year 2100. Oxygen depletion occurs thus during the same time epoch as global warming. Increased knowledge on how and why oxygen varies in space and time shapes the biogeochemical and ecological structure of marine systems and will be needed for future predictions of marine productivity. In coastal systems deoxygenation is also linked to human activities that lead to increased loadings of nutrients and organic matter, and to regional effects of climate induced changes in wind and precipitation patterns[...]"
Source: BJERKNES CENTRE
Authors: Anne Gro Vea Salvanes et al.
Low oxygen levels can help to prevent the detrimental effect of acute warming on mitochondrial efficiency in fish
"Aerobic metabolism of aquatic ectotherms is highly sensitive to fluctuating climates. Many mitochondrial traits exhibit phenotypic plasticity in response to acute variations in temperature and oxygen availability. These responses are critical for understanding the effects of environmental variations on aquatic ectotherms' performance. Using the European seabass, Dicentrarchus labrax, we determined the effects of acute warming and deoxygenation in vitro on mitochondrial respiratory capacities and mitochondrial[...]"
Source: The Royal Society Publishing
Authors: Elisa Thoral et al.