Consulta: subjectFacets:"Ocean acidification"
Registros recuperados: 29
Data/hora: 01/06/2024 16:47:37

Planetary Boundaries:  Exploring the Safe Operating Space for Humanity
Provedor de dados: 7
Autores: Steffen, Will; Stockholm Resilience Centre, Stockholm University; Australian National University, Australia; will.steffen@anu.edu.au; Noone, Kevin; Stockholm Resilience Centre, Stockholm University; Department of Applied Environmental Science, Stockholm University; kevin.noone@stockholmresilience.su.se; Chapin, F. Stuart III; Institute of Arctic Biology, University of Alaska Fairbanks; fschapiniii@alaska.edu; Lambin, Eric; Department of Geography, University of Louvain; lambin@geog.ucl.ac.be; Lenton, Timothy M; School of Environmental Sciences, University of East Anglia; t.lenton@uea.ac.uk; Scheffer, Marten; Aquatic Ecology and Water Quality Management Group, Wageningen University; Marten.Scheffer@wur.nl; Folke, Carl; Stockholm Resilience Centre, Stockholm University; The Beijer Institute of Ecological Economics, Royal Swedish Academy of Sciences; carl.folke@beijer.kva.se; Schellnhuber, Hans Joachim; Potsdam Institute for Climate Impact Research; Environmental Change Institute and Tyndall Centre, Oxford University ; schellnhuber@pik-potsdam.de; de Wit, Cynthia A; Department of Applied Environmental Science, Stockholm University; cynthia.de.wit@itm.su.se; Hughes, Terry; ARC Centre of Excellence for Coral Reef Studies, James Cook University; terry.hughes@jcu.edu.au; van der Leeuw, Sander; School of Human Evolution and Social Change, Arizona State University; vanderle@asu.edu; Rodhe, Henning; Department of Meteorology, Stockholm University; rodhe@misu.su.se; Snyder, Peter K; Department of Soil, Water, and Climate, University of Minnesota; pksnyder@umn.edu; Costanza, Robert; Stockholm Resilience Centre, Stockholm University; Gund Institute for Ecological Economics, University of Vermont; rcostanz@uvm.edu; Svedin, Uno; Stockholm Resilience Centre, Stockholm University; uno.svedin@formas.se; Falkenmark, Malin; Stockholm Resilience Centre, Stockholm University; Stockholm International Water Institute; malin.falkenmark@siwi.org; Karlberg, Louise; Stockholm Resilience Centre, Stockholm University; Stockholm Environment Institute; louise.karlberg@stockholmresilience.su.se; Corell, Robert W; The H. John Heinz III Center for Science, Economics and the Environment ; Corell@heinzctr.org; Fabry, Victoria J; Department of Biological Sciences, California State University San Marcos; fabry@csusm.edu; Hansen, James; NASA Goddard Institute for Space Studies; James.E.Hansen@nasa.gov; Walker, Brian; Stockholm Resilience Centre, Stockholm University; CSIRO Sustainable Ecosystems; Brian.Walker@csiro.au; Liverman, Diana; Environmental Change Institute, School of Geography and the Environment; Institute of the Environment, University of Arizona ; diana.liverman@eci.ox.ac.uk; Richardson, Katherine; Earth System Science Centre, University of Copenhagen; kari@science.ku.dk; Crutzen, Paul; Max Planck Institute for Chemistry; air@mpch-mainz.mpg.de; Foley, Jonathan; Institute on the Environment, University of Minnesota; jfoley@umn.edu.
Anthropogenic pressures on the Earth System have reached a scale where abrupt global environmental change can no longer be excluded. We propose a new approach to global sustainability in which we define planetary boundaries within which we expect that humanity can operate safely. Transgressing one or more planetary boundaries may be deleterious or even catastrophic due to the risk of crossing thresholds that will trigger non-linear, abrupt environmental change within continental- to planetary-scale systems.   We have identified nine planetary boundaries and, drawing upon current scientific understanding, we propose quantifications for seven of them. These seven are climate change (CO2 concentration in the atmosphere &amp;#60;350 ppm and/or a maximum change...
Tipo: Peer-Reviewed Reports
Palavras-chave: Atmospheric aerosol loading; Biogeochemical nitrogen cycle; Biological diversity; Chemical pollution; Climate change; Earth; Global freshwater use; Land system change; Ocean acidification; Phosphorus cycle; Planetary boundaries; Stratospheric ozone; Sustainability.
Ano: 2009

Long-term exposure to near-future ocean acidification does not affect the expression of neurogenesis- and synaptic transmission-related genes in the olfactory bulb of European sea bass (Dicentrarchus labrax)
Provedor de dados: 5
Autores: Mazurais, David; Servili, Arianna; Le Bayon, Nicolas; Gislard, Sebastien; Madec, Lauriane; Zambonino-infante, Jose-luis.
The decrease in ocean pH that results from the increased concentration of dissolved carbon dioxide (CO2) is likely to influence many physiological functions in organisms. It has been shown in different fish species that ocean acidification (OA) mainly affects sensory systems, including olfaction. Impairment of olfactory function may be due to a dysfunction of the GABAergic system and to an alteration of neuronal plasticity in the whole brain and particularly in olfactory bulbs. Recent studies revealed that OA-driven effects on sensory systems are partly mediated by the regulation of the expression of genes involved in neurotransmission and neuronal development. However, these studies were performed in fish exposed to acidified waters for short periods, of...
Tipo: Text
Palavras-chave: Ocean acidification; Long-term exposure; Gene expression; Olfactory bulbs.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00606/71786/70315.pdf

The planktonic stages of the salmon louse ( Lepeophtheirus salmonis) are tolerant of end-of-century p CO2 concentrations
Provedor de dados: 5
Autores: Thompson, Cameron R.s.; Fields, David M.; Bjelland, Reidun M.; Chan, Vera Bin San; Durif, Caroline M.f.; Mount, Andrew; Runge, Jeffrey A.; Shema, Steven D.; Skiftesvik, Anne Berit; Browman, Howard I.
The copepod Lepeophtheirus salmonis is an obligate ectoparasite of salmonids. Salmon lice are major pests in salmon aquaculture and due to its economic impact Lepeoph- theirus salmonis is one of the most well studied species of marine parasite. However, there is limited understanding of how increased concentration of pCO2 associated with ocean acidification will impact host-parasite relationships. We investigated the effects of increased pCO2 on growth and metabolic rates in the planktonic stages, rearing L. salmonis from eggs to 12 days post hatch copepodids under three treatment levels: Control (416 matm), Mid (747 matm), and High (942 matm). The pCO2 treatment had a significant effect on oxygen consumption rate with the High treatment animals exhibiting...
Tipo: Text
Palavras-chave: Salmon lice; Copepod; Ocean acidification; Parasite; Energetics; Metabolism; Growth; Lipid; Lepeophtheirus salmonis; Aquaculture.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00588/69998/67911.pdf

Impact of dust addition on the metabolism of Mediterranean plankton communities and carbon export under present and future conditions of pH and temperature
Provedor de dados: 5
Autores: Gazeau, Frédéric; Van Wambeke, France; Maranon, Emilio; Perez-lorenzo, Maria; Alliouane, Samir; Stolpe, Christian; Blasco, Thierry; Leblond, Nathalie; Zancker, Birthe; Engel, Anja; Marie, Barbara; Dinasquet, Julie; Guieu, Cécile.
Although atmospheric dust fluxes from arid as well as human-impacted areas represent a significant source of nutrients to surface waters of the Mediterranean Sea, studies focusing on the evolution of the metabolic balance of the plankton community following a dust deposition event are scarce and none were conducted in the context of projected future levels of temperature and pH. Moreover, most of the experiments took place in coastal areas. In the framework of the PEACETIME project, three dust-addition perturbation experiments were conducted in 300-L tanks filled with surface seawater collected in the Tyrrhenian Sea (TYR), Ionian Sea (ION) and in the Algerian basin (FAST) onboard the R/V “Pourquoi Pas?” in late spring 2017. For each experiment, six tanks...
Tipo: Text
Palavras-chave: Mediterranean Sea; Atmospheric deposition; Plankton community metabolism; Carbon export; Ocean acidification; Ocean warming.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00688/79967/82900.pdf

Cold-water corals in the Subpolar North Atlantic Ocean exposed to aragonite undersaturation if the 2 °C global warming target is not met
Provedor de dados: 5
Autores: García-ibáñez, Maribel I.; Bates, Nicholas R.; Bakker, Dorothee C.e.; Fontela, Marcos; Velo, Antón.
The net uptake of carbon dioxide (CO2) from the atmosphere is changing the ocean's chemical state. Such changes, commonly known as ocean acidification, include a reduction in pH and the carbonate ion concentration ([CO32−]), which in turn lowers oceanic saturation states (Ω) for calcium carbonate (CaCO3) minerals. The Ω values for aragonite (Ωaragonite; one of the main CaCO3 minerals formed by marine calcifying organisms) influence the calcification rate and geographic distribution of cold-water corals (CWCs), important for biodiversity. Here, high-quality measurements, collected on thirteen cruises along the same track during 1991–2018, are used to determine the long-term changes in Ωaragonite in the Irminger and Iceland Basins of the North Atlantic...
Tipo: Text
Palavras-chave: Ocean acidification; Aragonite saturation state; Atlantic Meridional Overturning Circulation; Eastern-Subpolar North Atlantic Ocean.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00688/79965/82895.pdf

High pCO2 promotes coral primary production
Provedor de dados: 5
Autores: Biscéré, T.; Zampighi, M.; Lorrain, Anne; Jurriaans, S.; Foggo, A.; Houlbrèque, F.; Rodolfo-metalpa, R.
While research on ocean acidification (OA) impacts on coral reefs has focused on calcification, relatively little is known about effects on coral photosynthesis and respiration, despite these being among the most plastic metabolic processes corals may use to acclimatize to adverse conditions. Here, we present data collected between 2016 and 2018 at three natural CO2 seeps in Papua New Guinea where we measured the metabolic flexibility (i.e. in hospite photosynthesis and dark respiration) of 12 coral species. Despite some species-specific variability, metabolic rates as measured by net oxygen flux tended to be higher at high pCO2 (ca 1200 µatm), with increases in photosynthesis exceeding those of respiration, suggesting greater productivity of...
Tipo: Text
Palavras-chave: Ocean acidification; Coral reefs; Acclimatization; Metabolic flexibility; CO2 seeps.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00509/62051/66205.pdf

Solutions for ecosystem-level protection of ocean systems under climate change
Provedor de dados: 5
Autores: Queiros, Ana M.; Huebert, Klaus B.; Keyl, Friedemann; Fernandes, Jose A.; Stolte, Willem; Maar, Marie; Kay, Susan; Jones, Miranda C.; Hamon, Katell; Hendriksen, Gerrit; Vermard, Youen; Marchal, Paul; Teal, Lorna R.; Somerfield, Paul J.; Austen, Melanie C.; Barange, Manuel; Sell, Anne F.; Allen, Icarus; Peck, Myron A.
The Paris Conference of Parties (COP21) agreement renewed momentum for action against climate change, creating the space for solutions for conservation of the ocean addressing two of its largest threats: climate change and ocean acidification (CCOA). Recent arguments that ocean policies disregard a mature conservation research field and that protected areas cannot address climate change may be oversimplistic at this time when dynamic solutions for the management of changing oceans are needed. We propose a novel approach, based on spatial meta-analysis of climate impact models, to improve the positioning of marine protected areas to limit CCOA impacts. We do this by estimating the vulnerability of ocean ecosystems to CCOA in a spatially explicit manner and...
Tipo: Text
Palavras-chave: Climate change; Conservation; COP21; Ecosystem model; Habitat; Marine spatial planning; Ocean; Ocean acidification; Species distribution; Warming.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00360/47089/48566.pdf

Changing Biogeochemistry of the Southern Ocean and Its Ecosystem Implications
Provedor de dados: 5
Autores: Henley, Sian F.; Cavan, Emma L.; Fawcett, Sarah E.; Kerr, Rodrigo; Monteiro, Thiago; Sherrell, Robert M.; Bowie, Andrew R.; Boyd, Philip W.; Barnes, David K. A.; Schloss, Irene R.; Marshall, Tanya; Flynn, Raquel; Smith, Shantelle.
The Southern Ocean plays a critical role in regulating global climate as a major sink for atmospheric carbon dioxide (CO2), and in global ocean biogeochemistry by supplying nutrients to the global thermocline, thereby influencing global primary production and carbon export. Biogeochemical processes within the Southern Ocean regulate regional primary production and biological carbon uptake, primarily through iron supply, and support ecosystem functioning over a range of spatial and temporal scales. Here, we assimilate existing knowledge and present new data to examine the biogeochemical cycles of iron, carbon and major nutrients, their key drivers and their responses to, and roles in, contemporary climate and environmental change. Projected increases in...
Tipo: Text
Palavras-chave: Southern Ocean; Biogeochemistry; Primary production; Iron; Nutrients; Carbon; Ecosystem; Ocean acidification.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00676/78831/81113.pdf

Greater Mitochondrial Energy Production Provides Resistance to Ocean Acidification in “Winning” Hermatypic Corals
Provedor de dados: 5
Autores: Agostini, Sylvain; Houlbrèque, Fanny; Biscéré, Tom; Harvey, Ben P.; Heitzman, Joshua M.; Takimoto, Risa; Yamazaki, Wataru; Milazzo, Marco; Rodolfo-metalpa, Riccardo.
Coral communities around the world are projected to be negatively affected by ocean acidification. Not all coral species will respond in the same manner to rising CO2 levels. Evidence from naturally acidified areas such as CO2 seeps have shown that although a few species are resistant to elevated CO2, most lack sufficient resistance resulting in their decline. This has led to the simple grouping of coral species into “winners” and “losers,” but the physiological traits supporting this ecological assessment are yet to be fully understood. Here using CO2 seeps, in two biogeographically distinct regions, we investigated whether physiological traits related to energy production [mitochondrial electron transport systems (ETSAs) activities] and biomass (protein...
Tipo: Text
Palavras-chave: Ocean acidification; Hermatypic corals; Mitochondrial electron transport activity; Biomass; Resistance.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00677/78925/81293.pdf

Variability and trends of carbon parameters at a time series in the eastern tropical Atlantic
Provedor de dados: 5
Autores: Lefevre, Nathalie; Veleda, Doris; Araujo, Moacyr; Caniaux, Guy.
Hourly fCO(2) is recorded at a time series at the PIRATA buoy located at 6 degrees S 10 degrees W in the eastern tropical Atlantic since June 2006. This site is located south and west of the seasonal Atlantic cold tongue and is affected by its propagation from June to September. Using an alkalinity - salinity relationship determined for the eastern tropical Atlantic and the observed fCO(2), pH and the inorganic carbon concentration are calculated. The time series is investigated to explore the intraseasonal, seasonal and interannual timescales for these parameters, and to detect any long-term trends. At intraseasonal timescales, fCO(2) and pH are strongly correlated. On seasonal timescales, the correlation still holds between fCO(2) and pH and their...
Tipo: Text
Palavras-chave: Fugacity of CO2; Ocean acidification; Time series; Eastern tropical Atlantic.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00623/73560/73207.pdf

Nonuniform ocean acidification and attenuation of the ocean carbon sink
Provedor de dados: 5
Autores: Fassbender, Andrea J.; Sabine, Christopher L.; Palevsky, Hilary I.
Surface ocean carbon chemistry is changing rapidly. Partial pressures of carbon dioxide gas (pCO(2)) are rising, pH levels are declining, and the ocean's buffer capacity is eroding. Regional differences in short-term pH trends primarily have been attributed to physical and biological processes; however, heterogeneous seawater carbonate chemistry may also be playing an important role. Here we use Surface Ocean CO2 Atlas Version 4 data to develop 12month gridded climatologies of carbonate system variables and explore the coherent spatial patterns of ocean acidification and attenuation in the ocean carbon sink caused by rising atmospheric pCO(2). High-latitude regions exhibit the highest pH and buffer capacity sensitivities to pCO(2) increases, while the...
Tipo: Text
Palavras-chave: Ocean acidification; Carbon sink; Revelle factor; Carbon cycle.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00661/77321/78794.pdf

An Enhanced Ocean Acidification Observing Network: From People to Technology to Data Synthesis and Information Exchange
Provedor de dados: 5
Autores: Tilbrook, Bronte; Jewett, Elizabeth B.; Degrandpre, Michael D.; Martin Hernandez-ayon, Jose; Feely, Richard A.; Gledhill, Dwight K.; Hansson, Lina; Isensee, Kirsten; Kurz, Meredith L.; Newton, Janet A.; Siedlecki, Samantha A.; Chai, Fei; Dupont, Sam; Graco, Michelle; Calvo, Eva; Greeley, Dana; Kapsenberg, Lydia; Lebrec, Marine; Pelejero, Carles; Schoo, Katherina L.; Telszewski, Maciej.
A successful integrated ocean acidification (OA) observing network must include (1) scientists and technicians from a range of disciplines from physics to chemistry to biology to technology development; (2) government, private, and intergovernmental support; (3) regional cohorts working together on regionally specific issues; (4) publicly accessible data from the open ocean to coastal to estuarine systems; (5) close integration with other networks focusing on related measurements or issues including the social and economic consequences of OA; and (6) observation-based informational products useful for decision making such as management of fisheries and aquaculture. The Global Ocean Acidification Observing Network (GOA-ON), a key player in this vision,...
Tipo: Text
Palavras-chave: Global Ocean Acidification Observing Network; Sustainable Development Goal; Ocean acidification; Ecosystem stressors; Capacity building.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00675/78727/80987.pdf

Non-additive effects of ocean acidification in combination with warming on the larval proteome of the Pacific oyster, Crassostrea gigas
Provedor de dados: 5
Autores: Harney, Ewan; Artigaud, Sebastien; Le Souchu, Pierrick; Miner, Philippe; Corporeau, Charlotte; Essid, Hafida; Pichereau, Vianney; Nunes, Flavia.
Increasing atmospheric carbon dioxide results in ocean acidification and warming, significantly impacting marine invertebrate larvae development. We investigated how ocean acidification in combination with warming affected D-veliger larvae of the Pacific oyster Crassostrea gigas. Larvae were reared for 40 h under either control (pH 8.1, 20 °C), acidified (pH 7.9, 20 °C), warm (pH 8.1, 22 °C) or warm acidified (pH 7.9, 20 °C) conditions. Larvae in acidified conditions were significantly smaller than in the control, but warm acidified conditions mitigated negative effects on size, and increased calcification. A proteomic approach employing two-dimensional electrophoresis (2-DE) was used to quantify proteins and relate their abundance to phenotypic traits. In...
Tipo: Text
Palavras-chave: Crassostrea gigas; Ocean acidification; Larval development; ATP synthase; GAPDH; Superoxide dismutase.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00299/40985/40076.pdf

Calcification morphotypes of the coccolithophorid Emiliania huxleyi in the Southern Ocean: changes in 2001 to 2006 compared to historical data
Provedor de dados: 5
Autores: Cubillos, J. C.; Wright, S. W.; Nash, G.; De Salas, M. F.; Griffiths, B.; Tilbrook, B.; Poisson, A.; Hallegraeff, G. M.
We conducted a scanning electron microscopic survey of morphological variations in the calcareous nanoplankton species Emiliania huxleyi in Southern Ocean surface water samples collected along a transect from 43 to 64 degrees S and 141 to 145 degrees E during November 2001, October to February 2002/2003, 2003/2004, 2004/2005 and 2005/2006. The results were compared with historical data from a similar transect occupied in December to January 1983/1984 and January to February 1994 and 1995. While E. huxleyi was absent or extremely sparse (0.1 to 1 cells ml(-1)) south of 60 degrees S in 1983/1984 and 1994/1995, this species was consistently present at about 100 cells ml(-1) between 60 and 65 degrees S during 2002 to 2006. The extended geographic range and/or...
Tipo: Text
Palavras-chave: Southern Ocean; Emiliania huxleyi; Calcite saturation state; Ocean acidification.
Ano: 2007
URL: https://archimer.ifremer.fr/doc/00236/34735/33191.pdf

Management strategies for coral reefs and people under global environmental change: 25 years of scientific research
Provedor de dados: 5
Autores: Comte, Adrien; Pendleton, Linwood H.; ,.
Coral reef ecosystems and the people who depend on them are increasingly exposed to the adverse effects of global environmental change (GEC), including increases in sea-surface temperature and ocean acidification. Managers and decision-makers need a better understanding of the options available for action in the face of these changes. We refine a typology of actions developed by Gattuso et al. (2015) that could serve in prioritizing strategies to deal with the impacts of GEC on reefs and people. Using the typology we refined, we investigate the scientific effort devoted to four types of management strategies: mitigate, protect, repair, adapt that we tie to the components of the chain of impact they affect: ecological vulnerability or social vulnerability....
Tipo: Text
Palavras-chave: Coral reefs; Climate change; Ocean acidification; Management; Adaptation.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00418/52917/53872.pdf

Optimum satellite remote sensing of the marine carbonate system using empirical algorithms in the global ocean, the Greater Caribbean, the Amazon Plume and the Bay of Bengal
Provedor de dados: 5
Autores: Land, Peter E.; Findlay, Helen S.; Shutler, Jamie D.; Ashton, Ian; Holding, Thomas; Grouazel, Antoine; Ardhuin, Fanny; Reul, Nicolas; Piolle, Jean-francois; Chapron, Bertrand; Quilfen, Yves; Bellerby, Richard G.j.; Bhadury, Punyasloke; Salisbury, Joseph; Vandemark, Douglas; Sabia, Roberto.
Improving our ability to monitor ocean carbonate chemistry has become a priority as the ocean continues to absorb carbon dioxide from the atmosphere. This long-term uptake is reducing the ocean pH; a process commonly known as ocean acidification. The use of satellite Earth Observation has not yet been thoroughly explored as an option for routinely observing surface ocean carbonate chemistry, although its potential has been highlighted. We demonstrate the suitability of using empirical algorithms to calculate total alkalinity (AT) and total dissolved inorganic carbon (CT), assessing the relative performance of satellite, interpolated in situ, and climatology datasets in reproducing the wider spatial patterns of these two variables. Both AT and CT in situ...
Tipo: Text
Palavras-chave: Carbonate chemistry; Earth observation; Ocean acidification; Total alkalinity; Dissolved inorganic carbon; SMOS; Aquarius; CORA; HadGEM2-ES.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00591/70267/68368.pdf

Current CaCO3 dissolution at the seafloor caused by anthropogenic CO2
Provedor de dados: 5
Autores: Sulpis, Olivier; Boudreau, Bernard P.; Mucci, Alfonso; Jenkins, Chris; Trossman, David S.; Arbic, Brian K.; Key, Robert M.
Oceanic uptake of anthropogenic CO2 leads to decreased pH, carbonate ion concentration, and saturation state with respect to CaCO3 minerals, causing increased dissolution of these minerals at the deep seafloor. This additional dissolution will figure prominently in the neutralization of man-made CO2 . However, there has been no concerted assessment of the current extent of anthropogenic CaCO3 dissolution at the deep seafloor. Here, recent databases of bottom-water chemistry, benthic currents, and CaCO3 content of deep-sea sediments are combined with a rate model to derive the global distribution of benthic calcite dissolution rates and obtain primary confirmation of an anthropogenic component. By comparing preindustrial with present-day rates, we determine...
Tipo: Text
Palavras-chave: Ocean acidification; Seafloor; CaCO3; Dissolution; Anthropogenic CO2.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00675/78677/80887.pdf

Le système des carbonates influencé par la diagenèse précoce dans les sédiments côtiers méditerranéens en lien avec l’acidification des océans
Provedor de dados: 5
Autores: Rassmann, Jens.
Continental shelves are key regions for the global carbon cycle and particularly exposed to ocean acidification. A large part of organic matter (OM) of continental and marine origin is mineralized in estuarine sediments following oxic and anoxic pathways. This mineralization produces dissolved inorganic carbon (DIC) leading to acidification of the bottom waters. Anoxic mineralization can produce total alkalinity (TA) that can contribute to buffer bottom water pH and increase the CO2 storage capacity of seawater. Measurements in the sediments of the Rhone River prodelta showed that anoxic mineralization, especially sulfate reduction, are the major pathways of OM mineralization and create high DIC and TA fluxes. Land derived OM is mineralized close to the...
Tipo: Text
Palavras-chave: Carbonate system; Early diagenesis; Mineralization; Pelagic-bentic fluxes; Rhone prodelta; Ocean acidification.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00659/77076/78398.pdf

Multiple Stressors and Ecological Complexity Require a New Approach to Coral Reef Research
Provedor de dados: 5
Autores: Pendleton, Linwood H.; Hoegh-guldberg, Ove; Langdon, Chris; Comte, Adrien.
Ocean acidification, climate change, and other environmental stressors threaten coral reef ecosystems and the people who depend upon them. New science reveals that these multiple stressors interact and may affect a multitude of physiological and ecological processes in complex ways. The interaction of multiple stressors and ecological complexity may mean that the negative effects on coral reef ecosystems will happen sooner and be more severe than previously thought. Yet, most research on the effects of global change on coral reefs focus on one or few stressors, pathways or outcomes (e.g., bleaching). Based on a critical review of the literature, we call for a regionally targeted strategy of mesocosm-level research that addresses this complexity and...
Tipo: Text
Palavras-chave: Coral reefs; Multiple stressors; Mesocosm-level research; Climate change; Ocean acidification.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00636/74835/75224.pdf

The future is now: marine aquaculture in the anthropocene
Provedor de dados: 5
Autores: Pernet, Fabrice; Browman, Howard I.
Aquaculture now produces more seafood than wild capture fisheries and this production is expected to at least double by 2050. Representing almost half of global production, marine aquaculture will contribute to sustainably feeding the growing humanity. However, climate change will undoubtedly challenge the future growth of marine aquaculture. Temperature and sea-level rise, shifts in precipitation, freshening from glacier melt, changing ocean productivity, and circulation patterns, increasing occurrence of extreme climatic events, eutrophication, and ocean acidification are all stressors that will influence marine aquaculture. The objective of this themed article set was to bring together contributions on the broad theme of the potential impacts,...
Tipo: Text
Palavras-chave: Adaptation; Bivalve; Blue economy; Carbon; Climate change; Marine diseases; Mitigation; Ocean acidification; Plasticity; Salmon; Seaweed; Sustainability.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00682/79406/81951.pdf

Seasonal Asymmetry in the Evolution of Surface Ocean pCO(2) and pH Thermodynamic Drivers and the Influence on Sea-Air CO2 Flux
Provedor de dados: 5
Autores: Fassbender, Andrea J.; Rodgers, Keith B.; Palevsky, Hilary I.; Sabine, Christopher L.
It has become clear that anthropogenic carbon invasion into the surface ocean drives changes in the seasonal cycles of carbon dioxide partial pressure (pCO(2)) and pH. However, it is not yet known whether the resulting sea-air CO2 fluxes are symmetric in their seasonal expression. Here we consider a novel application of observational constraints and modeling inferences to test the hypothesis that changes in the ocean's Revelle factor facilitate a seasonally asymmetric response in pCO(2) and the sea-air CO2 flux. We use an analytical framework that builds on observed sea surface pCO(2) variability for the modern era and incorporates transient dissolved inorganic carbon concentrations from an Earth system model. Our findings reveal asymmetric amplification...
Tipo: Text
Palavras-chave: Revelle Factor; Carbon cycle; Seasonal cycle; CO2 fluxes; Ocean acidification.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00675/78679/80884.pdf

Combined effects of global climate change and nutrient enrichment on the physiology of three temperate maerl species
Provedor de dados: 5
Autores: Qui-minet, Zujaila Nohemy; Coudret, Jérôme; Davoult, Dominique; Grall, Jacques; Mendez‐sandin, Miguel; Cariou, Thierry; Martin, Sophie.
Made up of calcareous coralline algae, maerl beds play a major role as ecosystem engineers in coastal areas throughout the world. They undergo strong anthropogenic pressures, which may threaten their survival. The aim of this study was to gain insight into the future of maerl beds in the context of global and local changes. We examined the effects of rising temperatures (+3°C) and ocean acidification (−0.3 pH units) according to temperature and pH projections (i.e., the RCP 8.5 scenario), and nutrient (N and P) availability on three temperate maerl species (Lithothamnion corallioides, Phymatolithon calcareum, and Lithophyllum incrustans) in the laboratory in winter and summer conditions. Physiological rates of primary production, respiration, and...
Tipo: Text
Palavras-chave: Calcification; Maerl; Nitrate; Ocean acidification; Ocean warming; Phosphate; Photosynthesis; Respiration.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00595/70722/68955.pdf

Oceans and Human Health: A Rising Tide of Challenges and Opportunities for Europe
Provedor de dados: 5
Autores: Fleming, L.e.; Mcdonough, N.; Austen, M.; Mee, L.; Moore, Michael; Hess, Philipp; Depledge, M.h.; White, M.; Philippart, Katja; Bradbrook, P.; Smalley, A.
The European Marine Board recently published a position paper on linking oceans and human health as a strategic research priority for Europe. With this position paper as a reference, the March 2014 Cornwall Oceans and Human Health Workshop brought together key scientists, policy makers, funders, business, and non governmental organisations from Europe and the US to review the recent interdisciplinary and cutting edge research in oceans and human health specifically the growing evidence of the impacts of oceans and seas on human health and wellbeing (and the effects of humans on the oceans). These impacts are a complex mixture of negative influences (e.g. from climate change and extreme weather to harmful algal blooms and chemical pollution) and beneficial...
Tipo: Text
Palavras-chave: Harmful algal blooms; Microbial pollution; Anthropogenic chemicals; Marine biotechnology; Climate change; Ocean acidification; Fisheries; Aquaculture; Seafood; Blue carbon; Marine energy; Blue gym; Ocean literacy; Risks; Benefits; EU Policy.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00192/30328/29066.pdf

Ocean acidification with (de)eutrophication will alter future phytoplankton growth and succession
Provedor de dados: 5
Autores: Flynn, Kevin J.; Clark, Darren R.; Mitra, Aditee; Fabian, Heiner; Hansen, Per J.; Glibert, Patricia M.; Wheeler, Glen L.; Stoecker, Diane K.; Blackford, Jerry C.; Brownlee, Colin.
Human activity causes ocean acidification (OA) though the dissolution of anthropogenically generated CO2 into seawater, and eutrophication through the addition of inorganic nutrients. Eutrophication increases the phytoplankton biomass that can be supported during a bloom, and the resultant uptake of dissolved inorganic carbon during photosynthesis increases water-column pH (bloom-induced basification). This increased pH can adversely affect plankton growth. With OA, basification commences at a lower pH. Using experimental analyses of the growth of three contrasting phytoplankton under different pH scenarios, coupled with mathematical models describing growth and death as functions of pH and nutrient status, we show how different conditions of pH modify the...
Tipo: Text
Palavras-chave: Ocean acidification; Eutrophication; Primary production; Plankton succession; Food security.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00286/39723/38196.pdf

Ecological and socioeconomic strategies to sustain Caribbean coral reefs in a high-CO2 world
Provedor de dados: 5
Autores: Andersson, Andreas J.; Venn, Alexander A.; Pendleton, Linwood; Brathwaite, Angelique; Camp, Emma; Cooley, Sarah; Gedhill, Dwight; Koch, Marguerite; Maliki, Samir; Manfrino, Carrie.
The Caribbean and Western Atlantic region hosts one of the world’s most diverse geopolitical regions and a unique marine biota distinct from tropical seas in the Pacific and Indian Oceans. While this region varies in human population density, GDP and wealth, coral reefs, and their associated ecosystem services, are central to people’s livelihoods. Unfortunately, the region’s reefs have experienced extensive degradation over the last several decades. This degradation has been attributed to a combination of disease, overfishing, and multiple pressures from other human activities. Furthermore, the Caribbean region has experienced rapid ocean warming and acidification as a result of climate change that will continue and accelerate throughout the 21st century....
Tipo: Text
Palavras-chave: Caribbean; Coral reef; Restoration; Climate change; Ocean acidification; Ecosystem services.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00495/60684/64180.pdf

Ocean Futures Under Ocean Acidification, Marine Protection, and Changing Fishing Pressures Explored Using a Worldwide Suite of Ecosystem Models
Provedor de dados: 5
Autores: Olsen, Erik; Kaplan, Isaac C.; Ainsworth, Cameron; Fay, Gavin; Gaichas, Sarah; Gamble, Robert; Girardin, Raphael; Eide, Cecilie H.; Ihde, Thomas F.; Morzaria-luna, Hem Nalini; Johnson, Kelli F.; Savina-rolland, Marie; Townsend, Howard; Weijerman, Mariska; Fulton, Elizabeth A.; Link, Jason S.
Ecosystem-based management (EBM) of the ocean considers all impacts on and uses of marine and coastal systems. In recent years, there has been a heightened interest in EBM tools that allow testing of alternative management options and help identify tradeoffs among human uses. End-to-end ecosystem modeling frameworks that consider a wide range of management options are a means to provide integrated solutions to the complex ocean management problems encountered in EBM. Here, we leverage the global advances in ecosystem modeling to explore common opportunities and challenges for ecosystem-based management, including changes in ocean acidification, spatial management, and fishing pressure across eight Atlantis (atlantis.cmar.csiro.au) end-to-end ecosystem...
Tipo: Text
Palavras-chave: Ecosystem-based management; Fisheries management; Ocean acidification; Marine protected areas; Atlantis ecosystem model.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00428/53948/55094.pdf

When can ocean acidification impacts be detected from decadal alkalinity measurements?
Provedor de dados: 5
Autores: Carter, B. R.; Frolicher, T. L.; Dunne, J. P.; Rodgers, K. B.; Slater, R. D.; Sarmiento, J. L.
We use a large initial condition suite of simulations (30 runs) with an Earth system model to assess the detectability of biogeochemical impacts of ocean acidification (OA) on the marine alkalinity distribution from decadally repeated hydrographic measurements such as those produced by the Global Ship-Based Hydrographic Investigations Program (GO-SHIP). Detection of these impacts is complicated by alkalinity changes from variability and long-term trends in freshwater and organic matter cycling and ocean circulation. In our ensemble simulation, variability in freshwater cycling generates large changes in alkalinity that obscure the changes of interest and prevent the attribution of observed alkalinity redistribution to OA. These complications from...
Tipo: Text
Palavras-chave: Alkalinity; Ocean acidification; Trend detection; Repeat hydrography; Carbon cycle; Carbonate system.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00383/49419/49860.pdf

Could artificial ocean alkalinization protect tropical coral ecosystems from ocean acidification?
Provedor de dados: 5
Autores: Feng, Ellias Y.; Keller, David P.; Koeve, Wolfgang; Oschlies, Andreas.
Artificial ocean alkalinization (AOA) is investigated as a method to mitigate local ocean acidification and protect tropical coral ecosystems during a 21st century high CO2 emission scenario. Employing an Earth system model of intermediate complexity, our implementation of AOA in the Great Barrier Reef, Caribbean Sea and South China Sea regions, shows that alkalinization has the potential to counteract expected 21st century local acidification in regard to both oceanic surface aragonite saturation Omega and surface pCO(2). Beyond preventing local acidification, regional AOA, however, results in locally elevated aragonite oversaturation and pCO(2) decline. A notable consequence of stopping regional AOA is a rapid shift back to the acidified conditions of...
Tipo: Text
Palavras-chave: Coral reef; Geoengineering; Ocean alkalinization; Ocean acidification; Climate engineering; Weathering enhancement.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00383/49417/49879.pdf

Evaluation of a semi-automatic system for long-term seawater carbonate chemistry manipulation
Provedor de dados: 97
Autores: TORRES,RODRIGO; MANRIQUEZ,PATRICIO H; DUARTE,CRISTIAN; NAVARRO,JORGE M; LAGOS,NELSON A; VARGAS,CRISTIAN A; LARDIES,MARCO A.
The assessment of the effects of Ocean Acidification (OA) on marine life has received increasing attention in recent marine research. On a mesocosmic scale, the CO2 levels in seawater can be manipulated to evaluate experimentally the consequences of OA on marine organisms (vertebrates and invertebrates). An ideal manipulation of carbonate chemistry should mimic exactly the changes to carbonate chemistry, which will occur in years to come. Although some methods have been described in the literature, here we describe in detail a simple, robust and inexpensive system to produce CO2-enriched seawater by bubbling the seawater with air-CO2 mixtures. The system uses mass flow controllers (MFC) to blend atmospheric air with pure CO2 to produce two pCO2 levels. The...
Tipo: Journal article
Palavras-chave: Carbonate chemistry manipulation; Ocean acidification.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000400006