Schlagwort: ocean-based CDR

Calls

Session at OSM24: CM004 – Modeling Approaches in Support of Ocean-based Carbon Dioxide Removal (CDR) Research

Abstract Submission Deadline: 13 September, 2023

Ocean Sciences Meeting 2024: 18-23 February, New Orleans

This session will report on various modeling approaches, and their integration with ocean observations, for addressing ocean-based CDR challenges including macroalgae cultivation, nutrient fertilization, and alkalinity enhancement. We invite contributions across a broad range of scales from particle-environment interactions on micrometers to meters, regional models covering 10s to 1000s of meters, to global models of the Earth system, to provide a comprehensive understanding of ocean-based CDR approaches.

Chair: Katja Fennel, Co-chairs: Kristen A Davis, David P Keller, Hyewon Kim

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Peer-reviewed Publications

Pessarrodona et al. (2023): Carbon sequestration and climate change mitigation using macroalgae: a state of knowledge review

Albert Pessarrodona, Rita M. Franco-Santos, Luka Seamus Wright, Mathew A. Vanderklift, Jennifer Howard, Emily Pidgeon, Thomas Wernberg, Karen Filbee-Dexter IN: Biological Reviews, https://doi.org/10.1111/brv.12990

In this study the authors examine the results of over 180 publications to synthesise evidence regarding macroalgal forest carbon sequestration potential. Fluxes leading directly to carbon sequestration (e.g. carbon export or burial in marine sediments) remain poorly resolved, likely hindering regional or country-level assessments of carbon sequestration potential, which are only available from 17 of the 150 countries where macroalgal forests occur. To solve this issue, the authors present a framework to categorize coastlines according to their carbon sequestration potential. Finally, they review the multiple avenues through which this sequestration can translate into climate change mitigation capacity, which largely depends on whether management interventions can increase carbon removal above a natural baseline or avoid further carbon emissions. 

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Peer-reviewed Publications

[Preprint] Oschlies et al.: Climate targets, carbon dioxide removal and the potential role of Ocean Alkalinity Enhancement

Andreas Oschlies, Lennart Bach, Rosalind Rickaby, Terre Satterfield, Romany M. Webb, Jean-Pierre Gattuso IN: State Planet Discuss., https://doi.org/10.5194/sp-2023-13, in review

Based on idealized theoretical studies, Ocean Alkalinity Enhancement (OAE) appears as a promising marine CDR method. However, the knowledge base is insufficient for a robust assessment of its practical feasibility, of its side effects, social and governance aspects as well as monitoring, reporting and verification issues. A number of research efforts aim to improve this in a timely manner. The authors provide an overview on the current situation of developing OAE as marine CDR method, and describe the history that has led to the creation of the OAE research Best Practices Guide.

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Events

Webinar: Emerging Innovations at the Ocean-Climate Nexus: Shore to Sea

Thursday, July 27, 2023, 6 – 7pm CEST

The inaugural 1-hour webinar „Emerging Innovations at the Ocean-Climate Nexus: Shore to Sea“ features Lacey Reddix (Olokun Minerals), Beth Zotter (Umaro Foods, MARINER offshore farming project), and Catherine Berner (Otherlab), who discuss their approaches to identifying and operationalizing innovative solutions from the seashore to the open ocean. Talks are followed by a moderated participatory discussion. Courtney McGeachy, Director of the Ocean Visions-UN Decade Collaborative Center, hosts.

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Media

Nature – Start-ups are adding antacids to the ocean to slow global warming. Will it work?

by Jeff Tollefson, Nature – News Feature, 28 June 2023

„A New York experiment is part of a commercial race to develop ocean-based technologies to extract carbon dioxide from the atmosphere.[…]This is one of the first field trials of a concept known as ocean alkalinity enhancement — essentially using antacids to help the ocean digest CO2. The two-year experiment is run by Vesta, a start-up climate company based in San Francisco, California, with enthusiastic support from local community leaders. Just metres down the beach, a newly installed welcome plaque proclaims that visitors are about to step onto “the world’s first carbon-removing beach”.“

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Peer-reviewed Publications

Nature – Arzeno-Soltero et al. (2023): Large global variations in the carbon dioxide removal potential of seaweed farming due to biophysical constraints

Isabella B. Arzeno-Soltero, Benjamin T. Saenz, Christina A. Frieder, Matthew C. Long, Julianne DeAngelo, Steven J. Davis, Kristen A. Davis IN: Commun Earth Environ 4, 18, https://doi.org/10.1038/s43247-023-00833-2

The authors apply a dynamic seaweed growth model that includes growth-limiting mechanisms, such as nitrate supply, to estimate the global potential yield of four types of seaweed. They estimate that harvesting 1 Gt year−1 of seaweed carbon would require farming over 1 million km2 of the most productive exclusive economic zones, located in the equatorial Pacific; the cultivation area would need to be tripled to attain an additional 1 Gt year−1 of harvested carbon, indicating dramatic reductions in carbon harvest efficiency beyond the most productive waters.

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German News

Metas Ex-Technikchef will das Meer zur riesigen CO₂-Senke machen

James Temple, MIT Technology Review, heise.de, 19.06.2023 08:00 Uhr

„Mike Schroepfer hat Carbon to Sea ausgegründet. Als gemeinnützige Organisation ist die Firma mit 50 Millionen US-Dollar ausgerüstet.[…] Zu den Zielen der Initiative gehören die Bewertung interessanter technischer Ansätze, die Durchführung von Feldversuchen in kleinem Maßstab im Meer, die Förderung von Maßnahmen zur Vereinfachung der Genehmigungsverfahren für solche Experimente und die Bereitstellung von mehr öffentlichen Mitteln für die Forschung. Schließlich muss auch noch die Technologie, die für die Durchführung und Bewertung solcher Methoden erforderlich ist, (neu) erfunden werden.“

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Media

Oceans absorb 30% of our emissions, driven by a huge carbon pump. Tiny marine animals are key to working out its climate impacts

Tyler Rohr, Anthony J. Richardson, Elizabeth H. Shadwick, theconversation.com, June 15, 2023 8.56am CEST

„In research published today, the autors show that zooplankton, tiny animals near the base of the ocean food chain, are likely to be the biggest source of uncertainty in how we model the marine carbon cycle. Getting their impact on the cycle right could add an extra 2 billion tonnes to current models’ assumptions about annual carbon uptake by the ocean. That’s more carbon than the entire global transportation sector emits.“

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Calls

Guide to Best Practices in Ocean Alkalinity Enhancement Research

Open for public review until 3 August 2023

Editor(s): Andreas Oschlies, Angela Stevenson, Lennart Bach, Katja Fennel, Rosalind Rickaby, Terre Satterfield, Romany Webb, Jean-Pierre Gattuso IN: State Planet Discuss. [preprints], in review, 2023.

The OAE Best Practices Guide is under development and chapter preprints will be open for public review. Please contribute your expertise where relevant! Chapter preprints will be made available on a rolling basis.

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