Gregor Rehder
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View article: Methane leakage through the sulfate–methane transition zone of the Baltic seabed
Methane leakage through the sulfate–methane transition zone of the Baltic seabed Open
Anaerobic oxidation of methane at the sulfate–methane transition in marine sediments is generally considered to be a near-perfect barrier against methane release from the seabed, but the mechanisms involved are not well understood. On the …
View article: Global Carbon Budget 2025
Global Carbon Budget 2025 Open
Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere in a changing climate is critical to better understand the global carbon cycle, support the…
View article: Large scale hydrogeochemical and isotopic observations in the Baltic Sea system
Large scale hydrogeochemical and isotopic observations in the Baltic Sea system Open
We report hydrogeochemical and isotopic observations across the Baltic Sea from two research expeditions: (1) a ~5000 km cruise-track onboard the R/V Skagerak in 2023 and (2) a land-based sampling for terrestrial endmembers in 2024. The sh…
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: Coastal zones of the Baltic Sea in the Anthropocene: Current state and the impact of climate change
Coastal zones of the Baltic Sea in the Anthropocene: Current state and the impact of climate change Open
View article: Variability of CO <sub>2</sub> and CH <sub>4</sub> in a coastal peatland rewetted with brackish water from the Baltic Sea derived from autonomous high-resolution measurements
Variability of CO <sub>2</sub> and CH <sub>4</sub> in a coastal peatland rewetted with brackish water from the Baltic Sea derived from autonomous high-resolution measurements Open
Rewetting peatlands is an important measure to reduce greenhouse gas (GHG) emissions from land use change. After rewetting, the areas can be highly heterogeneous in terms of GHG exchange and depend, for example, on water level, vegetation,…
View article: What initiates cyanobacterial blooms in the Baltic Sea?
What initiates cyanobacterial blooms in the Baltic Sea? Open
Massive summer blooms of cyanobacteria are a regular feature of the Baltic Sea, with impacts on primary production, nitrogen cycling, food chain structure and bottom layer oxygen deficiency. While many attempts have been made to associate …
View article: Supplementary material to "The distribution and isotopomeric characterization of nitrous oxide in the Eastern Gotland Basin (central Baltic Sea)"
Supplementary material to "The distribution and isotopomeric characterization of nitrous oxide in the Eastern Gotland Basin (central Baltic Sea)" Open
View article: The distribution and isotopomeric characterization of nitrous oxide in the Eastern Gotland Basin (central Baltic Sea)
The distribution and isotopomeric characterization of nitrous oxide in the Eastern Gotland Basin (central Baltic Sea) Open
Nitrous oxide (N2O) is a greenhouse gas with a global warming potential ~300 times that of carbon dioxide. Coastal areas are important sources of N2O to the atmosphere but the biogeochemical pathways of N2O production and consumption are n…
View article: Corrigendum: Direct effects of ocean alkalinity enhancement in the Baltic Sea–results from in-silico experiments
Corrigendum: Direct effects of ocean alkalinity enhancement in the Baltic Sea–results from in-silico experiments Open
View article: Diel-cycling hypoxia and hypercapnia interact with the physiological and redox response of the bivalve Mytilus edulis to heat-wave
Diel-cycling hypoxia and hypercapnia interact with the physiological and redox response of the bivalve Mytilus edulis to heat-wave Open
Climate change and eutrophication intensify marine heat-waves (MHWs) and cause fluctuations in oxygen and pH levels (FH) in coastal ecosystems. A temperate zone ecosystem engineer, the blue mussel (Mytilus edulis), provides a valuable mode…
View article: A holistic assessment framework for marine carbon dioxide removal options
A holistic assessment framework for marine carbon dioxide removal options Open
Marine carbon dioxide removal (mCDR) options could potentially play an important role in future CDR policy portfolios. They include, for example, ocean alkalinity enhancement, blue carbon projects such as mangrove cultivation, as well as s…
View article: Distinguish between feasibility and desirability when assessing climate response options
Distinguish between feasibility and desirability when assessing climate response options Open
The current literature on assessing climate change response options does not sufficiently distinguish between assessing options in terms of their feasibility and in terms of their desirability. One example of this is the IPCC feasibility a…
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: Direct effects of ocean alkalinity enhancement in the Baltic Sea–results from in-silico experiments
Direct effects of ocean alkalinity enhancement in the Baltic Sea–results from in-silico experiments Open
To achieve carbon neutrality, ocean alkalinity enhancement (OAE) is currently being researched as a marine option for carbon dioxide removal (CDR). The approach of releasing calcite near the sediments and using the effect of enhanced miner…
View article: Processes and microorganisms driving nitrous oxide production in the Benguela Upwelling System
Processes and microorganisms driving nitrous oxide production in the Benguela Upwelling System Open
Upwelling systems and their associated oxygen deficient zones (ODZs) are hotspots of nitrous oxide (N 2 O) production in the ocean. The Benguela Upwelling System (BUS) is a highly productive region and an important, yet variable source of …
View article: Methane emissions from the Nord Stream subsea pipeline leaks
Methane emissions from the Nord Stream subsea pipeline leaks Open
View article: Airborne observations reveal the fate of the methane from the Nord Stream pipelines
Airborne observations reveal the fate of the methane from the Nord Stream pipelines Open
View article: Nord Stream methane leaks spread across 14% of Baltic waters
Nord Stream methane leaks spread across 14% of Baltic waters Open
A suspected 443-486 kt of methane escaped from the Nord Stream pipelines in September 2022 at four explosion sites across three pipelines. Much of this methane rapidly escaped to the atmosphere, while an unknown amount was dissolved. We us…
View article: Cracking arbitrariness: A data-driven study of auditory iconicity in spoken English
Cracking arbitrariness: A data-driven study of auditory iconicity in spoken English Open
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: “Coastal Zones of the Baltic Sea in the Anthropocene – Threats, Progress and Open Questions”
“Coastal Zones of the Baltic Sea in the Anthropocene – Threats, Progress and Open Questions” Open
View article: Variability of CO <sub>2</sub> and CH <sub>4</sub> in a coastal peatland rewetted with brackish water from the Baltic Sea derived from autonomous high-resolution measurements
Variability of CO <sub>2</sub> and CH <sub>4</sub> in a coastal peatland rewetted with brackish water from the Baltic Sea derived from autonomous high-resolution measurements Open
Rewetting peatlands is an important measure to reduce greenhouse gas (GHG) emissions from land use change. After rewetting, the areas can be highly heterogeneous in terms of GHG exchange and depend on water level, vegetation, previous use,…
View article: Seasonal dynamics and regional distribution patterns of CO <sub>2</sub> and CH <sub>4</sub> in the north-eastern Baltic Sea
Seasonal dynamics and regional distribution patterns of CO <sub>2</sub> and CH <sub>4</sub> in the north-eastern Baltic Sea Open
Significant research has been carried out in the last decade to describe the CO2 system dynamics in the Baltic Sea. However, there is a lack of knowledge in this field in the NE Baltic Sea, which is the main focus of the present study. We …
View article: Increase in marginal sea alkalinity may impact air–sea carbon dioxide exchange and buffer acidification
Increase in marginal sea alkalinity may impact air–sea carbon dioxide exchange and buffer acidification Open
Total alkalinity (TA) has increased in the Baltic Sea, with implications for atmospheric CO 2 ‐induced acidification and CO 2 uptake. We compiled extensive data of TA in surface waters of the Baltic Sea, aiming to (i) identify new tendenci…
View article: Rewetting effects on nitrogen cycling and nutrient export from coastal peatlands to the Baltic Sea
Rewetting effects on nitrogen cycling and nutrient export from coastal peatlands to the Baltic Sea Open
Coastal nutrient loads from point sources such as rivers are mostly well-monitored. This is not the case for diffuse nutrient inputs from coastal catchments unconnected to rivers, despite the potential for high inputs due to intensive land…
View article: Seasonal dynamics and regional distribution patterns of CO <sub>2</sub> and CH <sub>4</sub> in the north-eastern Baltic Sea
Seasonal dynamics and regional distribution patterns of CO <sub>2</sub> and CH <sub>4</sub> in the north-eastern Baltic Sea Open
Significant research has been carried out in the last decade to describe the CO2 system dynamics in the Baltic Sea. However, there is a lack of knowledge in this field in the NE Baltic Sea, which is the main focus of the present study. We …
View article: Brackish water rewetting of a temperate coastal peatland: Effects on biogeochemistry, microorganisms and greenhouse gas emissions
Brackish water rewetting of a temperate coastal peatland: Effects on biogeochemistry, microorganisms and greenhouse gas emissions Open
Around 4 % of global greenhouse gas (GHG) emissions originate from drained peatlands. Unlike rewetting drained peatlands with freshwater, brackish water rewetting of coastal peatlands might not only reduce CO2 emissions, but also keep meth…
View article: Response of two coastal peatlands to the duration of rewetting and the release of nutrients
Response of two coastal peatlands to the duration of rewetting and the release of nutrients Open
Along the German coastline of the Baltic Sea are numerous former coastal fens. The originally approx. 40,000 hectares of peatland that were regularly flooded are now mostly diked, drained and are mainly used for agriculture. In order to be…
View article: A regional <i>p</i> CO <sub>2</sub> climatology of the Baltic Sea from in situ <i>p</i> CO <sub>2</sub> observations and a model-based extrapolation approach
A regional <i>p</i> CO <sub>2</sub> climatology of the Baltic Sea from in situ <i>p</i> CO <sub>2</sub> observations and a model-based extrapolation approach Open
Ocean surface pCO2 estimates are of great interest for the calculation of air–sea CO2 fluxes, oceanic uptake of anthropogenic CO2, and eventually the Global Carbon Budget. They are accessible from direct observations, which are discrete in…