Posts Tagged 'mitigation'

CO2 reduction for C2+ in seawater using a graphitic frustrated Lewis pair catalyst

Ocean acidification due to the absorption of 40% of the world’s anthropogenic CO2 emissions severely affects the faltering marine ecosystem and the economy. However, there are few reports on reducing CO2 dissolved in seawater. Herein, we introduce an electrochemical CO2 reduction battery system for use in seawater with a graphitic frustrated Lewis pair catalytic cathode doped with boron and nitrogen (BN-GFLP). BN-GFLP converts CO2 dissolved in seawater to multi-carbon (C2+) products during the discharge process, thus increasing the pH of intentionally acidified seawater from 6.4 to 8.0 with more than 87% Faradaic efficiency. In computational chemistry and spectroscopy, BN-GFLP binds CO2 in a unique manner that enables exothermic C–C coupling pathway to deliver 95% selectivity for valuable C2+ products. Based on our results, we suggest a molecular design strategy for next-generation CO2 reduction catalysts for both green oceans and the atmosphere.

Continue reading ‘CO2 reduction for C2+ in seawater using a graphitic frustrated Lewis pair catalyst’

Drivers of biogeochemical variability in a central California kelp forest: implications for local amelioration of ocean acidification

Kelp forests are among the world’s most productive marine ecosystems, and they have the potential to locally ameliorate ocean acidification (OA). In order to understand the contribution of kelp metabolism to local biogeochemistry, we must first quantify the natural variability and the relative contributions of physical and biological drivers to biogeochemical changes in space and time. We deployed an extensive instrument array in Monterey Bay, CA, inside and outside of a kelp forest to assess the degree to which giant kelp (Macrocystis pyrifera) locally ameliorates present‐day acidic conditions which we expect to be exacerbated by OA. Temperature, pH, and O2 variability occurred at semidiurnal, diurnal (tidal and diel), and longer upwelling event periods. Mean conditions were driven by offshore wind forcing and the delivery of upwelled water via nearshore internal bores. While near surface pH and O2 were similar inside and outside the kelp forest, surface pH was elevated inside the kelp compared to outside, suggesting that the kelp canopy locally increased surface pH. We observed the greatest acidification stress deeper in the water column where pCO2 reached levels as high as 1300 μatm and aragonite undersaturation (ΩAr <1) occurred on several occasions. At this site, kelp canopy modification of seawater properties, and thus any ameliorating effect against acidification is greatest in a narrow band of surface water. The spatial disconnect between stress exposure at depth and reduction of acidification stress at the surface warrants further assessment of utilizing kelp forests as provisioners of local OA mitigation.

Continue reading ‘Drivers of biogeochemical variability in a central California kelp forest: implications for local amelioration of ocean acidification’

Response of bacterial communities in Barents Sea sediments in case of a potential CO2 leakage from carbon reservoirs

Highlights

  • Simulation of real conditions of a CCS site are essentials for environmental risk assessments.

  • Marine bacteria may adapt to a new situation in case of acidification event for a short time.

  • Marine bacteria community is altered in case of a CO2 leakage after 3 weeks in long-term simulation.

  • Results did not show a potential recovery of marine bacteria when CO2 was stopped within the monitored period.

Abstract

Carbon capture and storage sites in Barents Sea shelf are currently in progress as part of climate change mitigation activities. However environmental impacts of a possible CO2 seepage on bacterial community are lacking knowledge. This work addressed potential consequences on bacterial communities from Snøvit region in Barents Sea sediments. Long-term experiment (92 days) was carried out mimicking realistic conditions of pressure (∼30 bars) using the unique hyperbaric chamber (Karl Erik TiTank). The experiment was divided in three stages: i) 21 days of no CO2, ii) 50 days of simulation of carbon dioxide leakage (depletion of pH to 7.0) and iii) 14 days emulating a leakage cessation. Results suggested that bacterial communities can adapt to a CO2 leakage in short term. However, bacteria showed negative effects in terms of activity, community structure, and number of cells after long term CO2 exposure. After CO2 leakage cessation, bacterial communities did not show a significant recovery. These findings highlighted that, even though marine bacteria showed adaptation to the new conditions (acidified environment), in case of a small but continuous CO2 leakage marine bacteria might not be recovered upon pre-exposure status.

    Continue reading ‘Response of bacterial communities in Barents Sea sediments in case of a potential CO2 leakage from carbon reservoirs’

    The Olympia oyster (Ostrea lurida) at risk for local extinction: addressing climate change impacts

    The Olympia oyster is native to San Francisco Bay (Ostrea lurida Carpenter 1864) (Barrett 1963). Their habitat ranges from Sitka, Alaska to Baja, California (Dall 1914). Historically, the Olympia oyster was abundant throughout the Pacific Northwest. However, their population has declined over the last few centuries due to anthropogenic influences, urbanization, and erosion (Groth and Rumrill 2009; McGraw 2009) Native Americans, pioneers, and gold miners consumed Olympia oysters which reduced the population. Remnants of native oyster shell middens around the Bay are evidence of the abundance prior to Spanish settlement. (Groth and Rumrill 2009; Coastal Conservancy and NOAA 2010). Over-harvesting reduced the oyster population and provided an opportunity to bring in non-native oysters due to the demand for oyster meat. Approximately 150 tons of oyster meat was processed (15% of the total oyster harvest represented the native oyster) during the height of the oyster industry which was from the late 1880s until 1904. (Barrett 1963). The resulting demand provided an opportunity to introduce the non-native Atlantic oyster in the San Francisco Bay, which further reduced the population of the native Olympia oyster as the nonnative Atlantic oyster was more significant in size and competed for space (Barrett 1963). Nonnative species of oysters such as the Eastern oyster from 1869-1940 and Pacific oysters from 1928-1950 were introduced into the San Francisco Bay. Ship ballasts brought in non-native species and fouling species (Ruiz et al. 2011), which preyed on the native oyster. However, the native oyster continues to live in the San Francisco Bay.

    Continue reading ‘The Olympia oyster (Ostrea lurida) at risk for local extinction: addressing climate change impacts’

    Irreversibility of marine climate change impacts under carbon dioxide removal

    Artificial carbon dioxide removal (CDR) from the atmosphere has been proposed as a measure for mitigating climate change and restoring the climate system to a target state after exceedance (“overshoot”). This research investigates to what extent overshoot and subsequent recovery of a given cumulative CO2 emissions level by CDR leaves a legacy in the marine environment using an Earth system model. We use RCP2.6 and its extension to year 2300 as the reference scenario and design a set of cumulative emissions and temperature overshoot scenarios based on other RCPs. Our results suggest that the overshoot and subsequent return to a reference cumulative emissions level would leave substantial impacts on the marine environment. Although the changes in sea surface temperature, pH and dissolved oxygen are largely reversible, global mean values and spatial patterns of these variables differ significantly from those in the reference scenario when the reference cumulative emissions are attained.

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    European policies and legislation targeting ocean acidification in European waters – current state

    Ocean acidification (OA) is a global problem with profoundly negative environmental, social and economic consequences. From a governance perspective, there is a need to ensure a coordinated effort to directly address it. This study reviews 90 legislative documents from 17 countries from the European Economic Area (EEA) and the UK that primarily border the sea. The primary finding from this study is that the European national policies and legislation addressing OA is at best uncoordinated. Although OA is acknowledged at the higher levels of governance, its status as an environmental challenge is greatly diluted at the European Union Member State level. As a notable exception within the EEA, Norway seems to have a proactive approach towards legislative frameworks and research aimed towards further understanding OA. On the other hand, there was a complete lack of, or inadequate reporting in the Marine Strategy Framework Directive by the majority of the EU Member States, with the exception of Italy and the Netherlands. We argue that the problems associated with OA and the solutions needed to address it are unique and cannot be bundled together with traditional climate change responses and measures. Therefore, European OA-related policy and legislation must reflect this and tailor their actions to mitigate OA to safeguard marine ecosystems and societies. A stronger and more coordinated approach is needed to build environmental, economic and social resilience of the observed and anticipated changes to the coastal marine systems.

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    Climate change and aquaculture: considering adaptation potential

    Increases in global population and seafood demand are occurring simultaneously with fisheries decline in an era of rapid climate change. Aquaculture is well positioned to help meet the world’s future seafood needs, but heavy reliance of most global aquaculture on the ambient environment and ecosystem services suggests inherent vulnerability to climate change effects. There are, however, opportunities for adaptation. Engineering and management solutions can reduce exposure to stressors or mitigate stressors through environmental control. Epigenetic adaptation may have the potential to improve stressor tolerance through parental or early life stage exposure. Stressor-resistant traits can be genetically selected for, and maintaining adequate population variability can improve resilience and overall fitness. Information at appropriate time scales is crucial for adaptive response, such as real-time data on stressor levels and/or species’ responses, early warning of deleterious events, or prediction of longer-term change. Diet quality and quantity have the potential to meet increasing energetic and nutritional demands associated with mitigating the effects of abiotic and biotic climate change stressors. Research advancements in understanding how climate change affects aquaculture will benefit most from a combination of empirical studies, modelling approaches, and observations at the farm level. Research to support aquaculture adaptation requires an increasing amount of environmental data to guide biological response studies for regional applications. Increased experimental complexity, resources, and duration will be necessary to better understand the effects of multiple stressors. Ultimately, in order for aquaculture sectors to move beyond short-term coping responses, governance initiatives incorporating the changing needs of stakeholders, users, and culture ecosystems as a whole are required to facilitate planned climate change adaptation and mitigation.

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    The application of the seaweeds in neutralizing the “ocean acidification” as a long-term multifaceted challenge

    The global effects of ocean acidification (OA) on coral reefs are of growing concern. Carbon dioxide released into the atmosphere as a result of burning fossil fuels, not only has an effect on “global warming”, but also on OA which is called the “other CO2 problem”. OA combined with high ocean temperatures has resulted in a massive bleaching of coral reefs in the Indian Ocean and throughout Southeast Asia over the past decade, which is ultimately lethal. Here we discuss the option if innovative seaweed bio-technology—the Ulva lactuca bioreactor option, with its H+ ion-absorbing capacity and its huge green biomass production of around 50 MT/ha/year—which can stabilize our “World Ocean” and our global coral reefs. From our calculations, we came to the conclusion that an area covered with “Ulva lactuca bioreactors” with a production capacity of 250 × 1016 ha of seaweed per year is needed to remove all H+ ions that cause OA in our “World Ocean” since the beginning of the “Industrial Revolution” ≈ 250 years ago. This is a daunting task and therefore we have opted for a multi-faceted approach including variability in seaweed species, avoidance of eutrophication & heavy-metal accumulation, prevention of global warming by more green-biomass production and a better estimation of the huge Kelp seaweed populations in temperate zones in order to protect our coral reefs for the short term.

    Continue reading ‘The application of the seaweeds in neutralizing the “ocean acidification” as a long-term multifaceted challenge’

    La terminologie de la géoingénierie marine. Une contribution au projet IATE-CvT (in French)

    Pour la première fois mentionnée dans la politique en 1965 par le comité consultatif scientifique du président des États-Unis, la géoingénierie (ou : ingénierie climatique) est une préoccupation relativement nouvelle. Plus de cinquante ans plus tard, le sujet reste néanmoins une topique controversée. La question reste : jusqu’où peut-on intervenir dans le climat afin de contrebalancer le changement climatique d’origine anthropocène ? La géoingénierie fait référence aux techniques développées pour lutter contre le changement climatique en supprimant les gaz à effet de serre de l’atmosphère de l’un côté et de l’autre en augmentant la quantité de lumière solaire réfléchie vers l’espace à partir de la terre et des océans (Shepherd, J. G. 2009). C’est un domaine actuel qui peut éventuellement impliquer chacun sur terre. Le domaine se trouve au cœur de nombreux sommets internationaux (p. ex. le COP21 de 2015 à Paris) et suscite non seulement des questions au niveau de la technologie, mais également au niveau éthique (jusqu’où peut-on altérer la nature ?), politique (protocole de Kyoto, 1997), philosophique (« on est Dieu »), sociologique (les conséquences pour les habitants), biologique (les conséquences pour les espèces) et économique (qui paye ?). Comme la géoingénierie est une préoccupation relativement nouvelle, la terminologie internationale laisse encore à désirer. Le domaine étant en pleine voie de développement, les scientifiques du domaine ne se préoccupent guère avec les mots qu’ils appliquent. Reste la tâche aux terminologues de décrire, nommer et normer les termes. Dans ce travail sont traités dix termes venant de la géoingénierie marine. Les termes ont été rencontrés dans des publications scientifiques anglaises, puis décrits en anglais, français et néerlandais de manière à les intégrer dans les bases de données terminologiques IATE et la base terminologique du Centrum voor Terminologie (CvT ; Centre pour Terminologie).

    Continue reading ‘La terminologie de la géoingénierie marine. Une contribution au projet IATE-CvT (in French)’

    Algal communities: an answer to global climate change

    Human activities and resultant changes in global climate have profound consequences for ecosystems and economic and social systems, including those that are dependent upon marine systems. The increasing concentration of atmospheric greenhouse gases (GHGs) has resulted in gradual modification of multiple aspects of marine ecosystem properties such as salinity, temperature, and pH. It is well known that temporal and spatial variations in environmental properties determine the composition and abundance of different algal populations in a region. Within the present study the evidence for algal compatibility to changing environmental conditions is surveyed. The unique ability of algal communities to play a role in promotion of CO2 sequestration technologies, biorefinery approaches, as well as transition to CO2‐neutral renewable energy has gained traction with environmentalists and economists in a view to mitigation of climate change using algae. The next step is to re‐evaluate the assumption of a steady‐state oceanic carbon cycle and the role of biological activities in response to future climate changes.

    Continue reading ‘Algal communities: an answer to global climate change’


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