Andreas Oschlies
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View article: Can Artificial Reoxygenation Revitalize Dying Coastal Seas?
Can Artificial Reoxygenation Revitalize Dying Coastal Seas? Open
Eutrophication and global warming are key drivers of oxygen loss, also termed deoxygenation, in coastal ecosystems worldwide. Artificial reoxygenation has been put forward as a local or regional solution to increase oxygen concentrations a…
View article: Supplementary material to "Ensemble simulation of the Last Glacial Maximum marine biogeochemistry and atmospheric pCO <sub>2</sub> drawdown due to the soft-tissue biological carbon pump"
Supplementary material to "Ensemble simulation of the Last Glacial Maximum marine biogeochemistry and atmospheric pCO <sub>2</sub> drawdown due to the soft-tissue biological carbon pump" Open
View article: Ensemble simulation of the Last Glacial Maximum marine biogeochemistry and atmospheric pCO <sub>2</sub> drawdown due to the soft-tissue biological carbon pump
Ensemble simulation of the Last Glacial Maximum marine biogeochemistry and atmospheric pCO <sub>2</sub> drawdown due to the soft-tissue biological carbon pump Open
During the Last Glacial Maximum (LGM), atmospheric pCO2 was approximately 90 ppm lower than in the pre-industrial era. Several hypotheses have been proposed to explain this difference, including changes in nutrient supply, increased iron i…
View article: Simulated Earth system response to acid downwelling as a form of ocean alkalinity enhancement
Simulated Earth system response to acid downwelling as a form of ocean alkalinity enhancement Open
“Acid downwelling” is a proposed marine CDR method, which describes the idea of electrochemically splitting open ocean surface water into an alkaline solution to remain at the surface ocean and cause additional ocean CO2 uptake, and into a…
View article: Monitoring marine carbon dioxide removal: quantitative analysis of indicators for carbon removed and environmental side-effects
Monitoring marine carbon dioxide removal: quantitative analysis of indicators for carbon removed and environmental side-effects Open
Marine carbon dioxide removal (mCDR) implementations can potentially remove 1–15 Gt CO 2 yr −1 , which encompasses the minimum requirement removal of CDR in 2050 to limit warming below 2 °C by 2100. Despite their potential, mCDR represents…
View article: Mapping the safe operating space of marine ecosystems under contrasting emission pathways
Mapping the safe operating space of marine ecosystems under contrasting emission pathways Open
Anthropogenic greenhouse gas emissions cause multiple changes in the ocean and its ecosystems through climate change and ocean acidification. These changes can occur progressively with rising atmospheric carbon dioxide concentrations, but …
View article: Southern Ocean Heat Burp in a Cooling World
Southern Ocean Heat Burp in a Cooling World Open
The ocean accumulates carbon and heat under anthropogenic CO 2 emissions and global warming. In net‐negative emission scenarios, where more CO 2 is extracted from the atmosphere than emitted, we expect global cooling. Little is known about…
View article: Nearshore Macroalgae Cultivation for Carbon Sequestration by Biomass Harvesting: Evaluating Potential and Impacts With an Earth System Model
Nearshore Macroalgae Cultivation for Carbon Sequestration by Biomass Harvesting: Evaluating Potential and Impacts With an Earth System Model Open
This study assesses an ocean‐based carbon dioxide removal (CDR) approach: Nearshore Macroalgae Aquaculture for Carbon Sequestration (N‐MACS). By cultivating macroalgae in nearshore areas, N‐MACS aims to sequester atmospheric through subseq…
View article: Reawakening of the bipolar seesaw under CO2 stabilisation
Reawakening of the bipolar seesaw under CO2 stabilisation Open
Anti-phased polar thermal and ventilation patterns are a recognised feature of climates of the past, thought to influence climate transitions. Here we initiate a bipolar seesaw in an earth system model by stabilising atmospheric CO2 at yea…
View article: Direct cooling effect of artificial upwelling dominates over its marine carbon dioxide removal potential
Direct cooling effect of artificial upwelling dominates over its marine carbon dioxide removal potential Open
Artificial upwelling (AU) is investigated as a marine carbon dioxide removal (CDR) method with a strong focus on its potential impact on Earth’s carbon cycle, in particular enhanced air-sea CO 2 flux. The overarching goal of marine CDR met…
View article: Dual-tracer constraints on the inverse Gaussian transit time distribution improve the estimation of water mass ages and their temporal trends in the tropical thermocline
Dual-tracer constraints on the inverse Gaussian transit time distribution improve the estimation of water mass ages and their temporal trends in the tropical thermocline Open
Quantifying the mean state and temporal change of seawater age is crucial for understanding the role of ocean circulation and its change in the climate system. One commonly used technique to estimate the water age is the inverse Gaussian t…
View article: Future Scenarios of Global Fisheries and Ocean Alkalinity Enhancement Under Socio‐Economic and Climate Pathways
Future Scenarios of Global Fisheries and Ocean Alkalinity Enhancement Under Socio‐Economic and Climate Pathways Open
Achieving global climate goals while ensuring food security in a changing climate presents significant challenges, particularly when relying solely on land‐based solutions. Covering over 70% of the Earth's surface, the ocean remains an und…
View article: Degrees of reversibility of ocean deoxygenation in an atmospheric carbon dioxide removal scenario
Degrees of reversibility of ocean deoxygenation in an atmospheric carbon dioxide removal scenario Open
Over the last century, increasing atmospheric carbon dioxide (CO 2 ) concentrations, among other greenhouse gases, and resulting climate change have greatly impacted the ocean. Observed impacts include lower oxygen solubility and changes i…
View article: Potential impacts of marine carbon dioxide removal on ocean oxygen
Potential impacts of marine carbon dioxide removal on ocean oxygen Open
Global warming is a main cause for current ocean deoxygenation. A deployment of marine carbon dioxide removal (CDR) for mitigating global warming could therefore also be viewed as a measure for mitigating ocean deoxygenation if, and only i…
View article: Limits to CDR accounting: the role of carbon fluxes, time(liness) and storage
Limits to CDR accounting: the role of carbon fluxes, time(liness) and storage Open
View article: No compromise in efficiency from the co-application of a marine and a terrestrial CDR method
No compromise in efficiency from the co-application of a marine and a terrestrial CDR method Open
Modelled pathways consistent with the Paris Agreement goals to mitigate warming typically include the large-scale application of Carbon Dioxide Removal (CDR), which can include both land- and marine-based CDR methods. However, the Earth sy…
View article: Could Bubbling Oxygen Revitalize Dying Coastal Seas?
Could Bubbling Oxygen Revitalize Dying Coastal Seas? Open
Reoxygenation approaches have shown some success in lakes, but their potential risks must be examined carefully before they’re implemented as solutions to improve the health of coastal waters.
View article: Exploring Site‐Specific Carbon Dioxide Removal Options With Storage or Sequestration in the Marine Environment – The 10 Mt CO<sub>2</sub> yr<sup>−1</sup> Removal Challenge for Germany
Exploring Site‐Specific Carbon Dioxide Removal Options With Storage or Sequestration in the Marine Environment – The 10 Mt CO<sub>2</sub> yr<sup>−1</sup> Removal Challenge for Germany Open
Marine carbon dioxide removal (mCDR) and geological carbon storage in the marine environment (mCS) promise to help mitigate global climate change alongside drastic emission reductions. However, the implementable potential of mCDR and mCS d…
View article: CMIP6 models agree on similar carbon cycle feedbacks between enhancing terrestrial and marine carbon sinks
CMIP6 models agree on similar carbon cycle feedbacks between enhancing terrestrial and marine carbon sinks Open
Carbon dioxide removal (CDR) is a crucial component of climate mitigation required to reach international climate targets. However, gaps exist in our understanding of the responses and feedbacks of the Earth system to the deployment of CDR…
View article: Current Oceanic CO2 Uptake: The Priming Effect of the Marine Carbon Pumps
Current Oceanic CO2 Uptake: The Priming Effect of the Marine Carbon Pumps Open
The impact of marine biological carbon pumps (BCPs) on atmospheric pCO2 (pCO2atm) is considered to be very important in the context of long-term climate swings (e.g. glacial-interglacial). However, under the current climate change transien…
View article: Perspectives and challenges of marine carbon dioxide removal
Perspectives and challenges of marine carbon dioxide removal Open
The Paris Agreement to limit global warming to well below 2°C requires drastic reductions in greenhouse gas emissions and the balancing of any remaining emissions by carbon dioxide removal (CDR). Due to uncertainties about the potential an…
View article: New findings on capturing CO₂ by increasing the alkalinity of seawater: The seven most important outcomes of RETAKE research
New findings on capturing CO₂ by increasing the alkalinity of seawater: The seven most important outcomes of RETAKE research Open
In the CDRmare research consortium RETAKE, experts investigate how enhanced weathering of minerals can increase the ocean’s acid-binding capacity (alkalinity). They examine whether or not this process amplifies the seawater’s natural carbo…
View article: Variation of ventilation in the North Atlantic over the past three decades - a climate change signal
Variation of ventilation in the North Atlantic over the past three decades - a climate change signal Open
The North Atlantic Meridional Overturning Circulation (AMOC) ventilates a large part of the world ocean via the formation of mode waters and North Atlantic Deep Water. Whether human activities have altered this ventilation system remains u…
View article: Climate intervention research in the World Climate Research Programme: a perspective
Climate intervention research in the World Climate Research Programme: a perspective Open
The 2023 World Climate Research Programme (WCRP) Open Science Conference underscored the critical need for increased climate change mitigation and adaptation efforts, along with enhanced climate knowledge and decision-making systems. This …
View article: A storyline approach: integrating comprehensive, interdisciplinary research results to create narratives – in the context of the net-zero target in Germany
A storyline approach: integrating comprehensive, interdisciplinary research results to create narratives – in the context of the net-zero target in Germany Open
With the amendment to the German Climate Change Act in 2021, the Federal Government of Germany has set the target to become greenhouse gas neutral by 2045. Reaching this ambitious target requires multisectoral efforts, which in turn calls …
View article: Opportunities for Earth Observation to Inform Risk Management for Ocean Tipping Points
Opportunities for Earth Observation to Inform Risk Management for Ocean Tipping Points Open
View article: Effective control mechanisms of research on climate engineering techniques for the public good—The London Protocol regulatory approach as a role model
Effective control mechanisms of research on climate engineering techniques for the public good—The London Protocol regulatory approach as a role model Open
Climate engineering, including Carbon Dioxide Removal and Solar Radiation Modification techniques, increasingly gets into the public discussion on effective climate change policies. As most of these techniques are still in their infancy, t…
View article: Competing effects of wind and buoyancy forcing on ocean oxygen trends in recent decades
Competing effects of wind and buoyancy forcing on ocean oxygen trends in recent decades Open
View article: Marine Geoengineering for a Sustainable Future: Integrating Fisheries and Ocean Alkalinity Enhancement in Global Scenarios
Marine Geoengineering for a Sustainable Future: Integrating Fisheries and Ocean Alkalinity Enhancement in Global Scenarios Open
View article: Riverine nutrient impact on global ocean nitrogen cycle feedbacks and marine primary production in an Earth system model
Riverine nutrient impact on global ocean nitrogen cycle feedbacks and marine primary production in an Earth system model Open
Riverine nutrient export is an important process in marine coastal biogeochemistry and also impacts global marine biology. The nitrogen cycle is a key player here. Internal feedbacks are shown to regulate not only nitrogen distribution, bu…