30.09.2021

# Calls & events

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Call for Abstracts: 2nd International Conference on Negative CO2 Emissions

Deadline: 1. December 2021

"The objective of the Paris Agreement is to limit global warming to well below 2ºC, and to pursue efforts to limit the temperature increase to 1.5ºC. The carbon budget is the amount of carbon dioxide that we can emit while still limiting global temperature rise to a given level, for example 1.5ºC.The exact size of the carbon budget is uncertain and depends on many factors, including potential future warming of non-CO2 climate forcers. This said, the remaining budgets for limiting the warming to 1.5ºC or 2ºC have been estimated at about 420 and 1170 Gt of CO2 . With unchanged present emissions at about 40 Gt CO2/year these budgets would be exhausted in as few as 10 and 30 years, respectively. Most of the IPCC emission scenarios that meet a global two-degree target in 2100 overshoot the carbon budget at first and then remove the excess carbon with large negative emissions, typically on the order of 400‑800 Gt CO2 up to 2100.At the same time as negative emissions appear to be indispensable to meet adopted climate targets, the large future negative emissions assumed in climate models have been questioned and warnings have been raised about relying on very large and uncertain negative emissions in the future. With the future climate at stake, a deeper and fuller understanding of the various aspects of negative emissions is needed."

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20.08.2021

# New Publications

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Burt, Daniel J.; et al. (2021): The Sensitivity of the Marine Carbonate System to Regional Ocean Alkalinity Enhancement

Burt, Daniel J.; Fröb, Friederike; Ilyina, Tatiana (2021): The Sensitivity of the Marine Carbonate System to Regional Ocean Alkalinity Enhancement. In Front. Clim. 3, p. 21. DOI: 10.3389/fclim.2021.624075.

"Ocean Alkalinity Enhancement (OAE) simultaneously mitigates atmospheric concentrations of CO2 and ocean acidification; however, no previous studies have investigated the response of the non-linear marine carbonate system sensitivity to alkalinity enhancement on regional scales. We hypothesise that regional implementations of OAE can sequester more atmospheric CO2 than a global implementation."

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07.06.2021

# Calls & events

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PhD Position: "Ocean Biogeochemical Modelling (ocean alkalinity enhancement)" (Alfred-Wegener-Institut)

Deadline: 21. June 2021

"This position will be part of the Programme RETAKE: Carbon Dioxide Removal by Alkalinity Enhancement: Potential, Benefits and Risks, within the Mission of the German Alliance for Marine Research (DAM): “Marine carbon sinks in decarbonization pathways” and funded by the German Ministry for Science and Education."

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03.05.2021

# New Publications

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Terhaar, Jens, et al. (2021): Southern Ocean anthropogenic carbon sink constrained by sea surface salinity

Terhaar, Jens; Frölicher, Thomas L.; Joos, Fortunat (2021): Southern Ocean anthropogenic carbon sink constrained by sea surface salinity. In Science Advances 7 (18). DOI: 10.1126/sciadv.abd5964.

"We identify a tight relationship across two multimodel ensembles between present-day sea surface salinity in the subtropical-polar frontal zone and the anthropogenic carbon sink in the Southern Ocean."

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03.05.2021

# Media

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EurekAlert!: Uncertainty of future Southern Ocean CO2 uptake cut in half

"Together with Thomas Frölicher and Fortunat Joos, who are also researchers at the Oeschger Centre, Terhaar has just presented in the scientific journal "Sciences Advances" a new method for constraining the Southern Ocean's CO2 sink."

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08.04.2021

# New Publications

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Caserini, Stefano; et al. (2021): Potential of Maritime Transport for Ocean Liming and Atmospheric CO2 Removal

Caserini, Stefano; Pagano, Dario; Campo, Francesco; Abbà, Antonella; Marco, Serena de; Righi, Davide et al. (2021): Potential of Maritime Transport for Ocean Liming and Atmospheric CO2 Removal. In Front. Clim. 3. DOI: 10.3389/fclim.2021.575900.

"In this study, the potential of discharging calcium hydroxide (slaked lime, SL) using existing maritime transport is evaluated, at the global scale and for the Mediterranean Sea."

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16.02.2021

# Calls & events

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Job: Postdoc Position in Modelling Ocean Alkalinity Enhancement Strategies and Ocean Resilience Patterns from Biodiversity Data (University of Southern Denmark)

Deadline: 15. March 2021

"Aim of the postdoc project is to develop a model based on metagenomic and other biodiversity-related and biogeochemical datasets to establish the relationship between ocean alkalinity and diversity patterns, and to explore where protective strategies, especially ocean alkalinity enhancement, make sense to apply."

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25.01.2021

# Media

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Our Shared Seas: A Primer for Philanthropy on Ocean-Climate Interventions

"One useful categorization of ocean-climate efforts divides interventions into three areas: the mitigation of future greenhouse gas emissions, the accelerated sequestration of atmospheric CO2, and adaptation efforts to help vulnerable habitats and communities adapt to the stresses of climate change."

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10.12.2020

# New Publications

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Köhler, Peter (2020): Anthropogenic CO2 of High Emission Scenario Compensated After 3500 Years of Ocean Alkalinization With an Annually Constant Dissolution of 5 Pg of Olivine

Köhler, Peter (2020): Anthropogenic CO2 of High Emission Scenario Compensated After 3500 Years of Ocean Alkalinization With an Annually Constant Dissolution of 5 Pg of Olivine. In Front. Clim. 2. DOI: 10.3389/fclim.2020.575744.

"I here analyze ocean alkalinization in a high CO2 world (emission scenario SSP5-85-EXT++ and CDR-ocean-alk within CDRMIP) for the next millennia using a revised version of the carbon cycle model BICYCLE, whose long-term feedbacks are calculated for the next 1 million years."

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03.12.2020

# New Publications

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Bertram, Christine; Merk, Christine (2020): Public perceptions of ocean-based carbon dioxide removal technologies: the nature - engineering divide

Bertram, Christine; Merk, Christine (2020): Public perceptions of ocean-based carbon dioxide removal technologies: the nature - engineering divide. In Front. Clim. 2, p. 31. DOI: 10.3389/fclim.2020.594194.

"We outline past work on the public perceptions and acceptability of ocean-based CDR among laypersons covering the main developments over the past 15 years. We compare and synthesize insights from two distinct strands of literature – one on climate engineering approaches and the other on coastal ecosystem management or blue carbon approaches."

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