Lennart Bach

New study by Dong et al. shows that #bubble-mediated #CO2 transfer favors invasion based on field evidence. They introduce an asymmetric #BulkFlux equation, suggesting that the global #ocean may absorb ~15% more #CO2 than previously estimated.
www.nature.com/articles/s41...

The Physiological Response of Contrasting Coccolithophore Species to Ocean Alkalinity Enhancement Increased alkalinity significantly boosts growth rates of coccolithophores Gephyrocapsa huxleyi and Coccolithus braarudii Divergent responses between species arise as large C. braarudii rely on C...

@agu.org New in #JGR a study on 🌊 Ocean Alkalinity Enhancement: higher alkalinity speeds up growth of key #coccolithophores, but at very high TA calcification falters & shells deform. Authors suggest TA <~3,000 μmol kg−1 as a safer ecosystem boundary. doi.org/10.1029/2025... #protistsonsky

the first link should work without paywall I think

Natural carbon uptake by ocean biology will not deliver credible carbon credits - Nature Reviews Earth & Environment Natural CO2 removal is increasingly being claimed as anthropogenic climate mitigation. This misrepresentation is already prevalent for forests and coastal ecosystems; there is now the risk of the erro...

Or in other words, we argue why these natural, biotic fluxes should not be considered as carbon commitments made by countries under the Paris Agreement.

We hope this Comment can help to inform discussions around this topic at COP30.

www.nature.com/articles/s43...

In this short Comment Phillip Williamson, Jo House, Phil Boyd and I argue why natural CO2 removal via the "biological carbon pump" is unfit for inclusion into Nationally Determined Contributions (NDCs).

Natural carbon uptake by ocean biology will not deliver credible carbon credits Nature Reviews Earth & Environment - Natural CO2 removal is increasingly being claimed as anthropogenic climate mitigation. This misrepresentation is already prevalent for forests and coastal...

"Natural CO2 removal is increasingly being claimed as anthropogenic climate mitigation. This misrepresentation is already prevalent for forests and coastal ecosystems; there is now the risk of the error reoccurring for open-ocean CO2 uptake via the biological carbon pump."\

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rdcu.be/eOooz

@geoengineering1.bsky.social invite him on podcast!

A new guide on best practices for engaging coastal communities on ocean alkalinity enhancement by Sara Nawaz and Giulia Belotti.

🌊

edspace.american.edu/carbonremova...

Winners and losers under hydroxide‐based ocean alkalinity enhancement in a Tasmanian plankton community Ocean alkalinity enhancement (OAE) is an emerging carbon dioxide CO2 removal approach for climate change mitigation and can be implemented with various alkaline materials that convert dissolved CO2 i...

Her Comment is associated with @kiyaskousoulas.bsky.social study on electrochemical OAE effects on plankton in Tasmania.

Thanks Mallory!

onlinelibrary.wiley.com/doi/10.1111/...

Kind words by Mallory Ringham from Ebb Carbon about research informing the "Ocean Alkalinity Enhancement Pelagic Impact Intercomparison Project" #OAEPIIP.

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Agreed, the key benefit of OAEPIIP is bringing the OAE research community together.

onlinelibrary.wiley.com/doi/full/10....

Accounting for albedo in carbon market protocols - Nature Communications The paper analyzes the impact of omitting biophysical effects from carbon credits on climate mitigation. It shows that some Voluntary Carbon Market projects may result in net warming due to albedo whi...

Some of the climate benefits of forestry and revegetation projects are erased by the fact that they reduce the reflectivity of Earth's surface. 🧪

This is a recording of the fourth webinar in the GGR Insights series, which presents the latest research and debates what is needed to enable the sustainable scale-up of greenhouse gas removal in the… Making space for “place” in carbon removal: learning from the communities of St Ives Bay

Last week we hosted the 4th webinar in our GGR Insights series. In 'Making space for "place" in carbon removal: learning from the communities of St Ives Bay', we explored a marine CO2 removal trial in Cornwall & the community response to it. Watch the recording on YouTube: youtu.be/_MgoETf3-Sg?...

Interactions between ocean alkalinity enhancement and phytoplankton in an Earth system model Abstract. The functioning and efficiency of ocean alkalinity enhancement (OAE) as a CO2 removal strategy is well investigated in model studies, but risks for the ecosystem are presently not considered...

🌊 New paper out today: Assessing the interaction between ocean alkalinity enhancement 🚢 and phytoplankton🦠 in an Earth System Model 🌐
#mCDR #OAE #ESM
bg.copernicus.org/articles/22/...

Calcifying plankton: From biomineralization to global change The cycling of calcium carbonate (CaCO3) in the ocean is closely linked to seawater alkalinity and the regulation of atmospheric CO2. In the modern pelagic ocean, almost all CaCO3 is produced by three...

Hello! we have a new paper out today in @science.org reviewing Calcifying Plankton : from Biomineralization to Global change 🌊🧪🐚

www.science.org/doi/10.1126/...

Sunset over a series of mesocosm experiments

Sunset over Dapeng, Shenzhen, China

Collecting seawater samples from incubation experiments

Happy #FieldworkFriday from our SUSTech students who are busy in Dapeng running large-scale incubations to look at the side-effects of Ocean Alkalinity Enhancement on marine ecosystems 🌊

Still looking for 1 more guest editor :-)
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Stakeholders have knowledge priorities beyond local impacts for responsible marine-based carbon dioxide removal in Tasmania - Communications Earth & Environment Tasmanian stakeholders require targeted knowledge on ocean alkalinity enhancement to develop informed views, particularly regarding feasibility, impacts, governance, and policy objectives, according t...

It is good to see that a diverse set of stakeholders from Tasmania have a nuanced view on marine CO2 removal, specifically Ocean Alkalinity Enhancement.

This is encouraging and, indeed, important to follow their request and inform the public more.
🌊

www.nature.com/articles/s43...

Carbon credits are failing to help with climate change — here’s why The idea that emissions can be offset through projects that claim to avoid releases or to remove carbon dioxide from the atmosphere is fatally flawed.

"Carbon credits are failing to help with climate change — here’s why.

The idea that emissions can be offset through projects that claim to avoid releases or to remove carbon dioxide from the atmosphere is fatally flawed." by Macintosh et al.

www.nature.com/articles/d41...

We are looking for 2 more guest editors :-)

Further information on the participants and general insights on OAEPIIP can be found here: 🌊

appliedbgc.imas.utas.edu.au/ocean-alkali...

Technical note: Ocean Alkalinity Enhancement Pelagic Impact Intercomparison Project (OAEPIIP) Abstract. Ocean alkalinity enhancement (OAE) aims to transfer carbon dioxide (CO2) from the atmosphere to the ocean by increasing the capacity of seawater to store CO2. The potential effects of OAE-in...

We are currently proposing a special issue in Biogeosciences to publish individual experiments of the "Ocean Alkalinity Enhancement Pelagic Impact Intercomparison Project #OAEPIIP".

Let me know if you are keen to serve as guest editors for the special issue ☺️
🌊

bg.copernicus.org/articles/21/...

Lethal by design? Guiding environmental assessments of ocean alkalinity enhancement toward realistic contextualization of the alkalinity perturbation – CDRXIV Ocean Alkalinity Enhancement (OAE) aims to mitigate climate change by increasing the chemical capacity of seawater to store anthropogenic CO2. OAE can be implemented through multiple pathways, each of...

Lethal by design? Guiding environmental assessments of ocean alkalinity enhancement toward realistic contextualization of the alkalinity perturbation. cdrxiv.org/preprint/457

Despite covering just Q.2 percent of the sea floor, seagrasses account for an estimated 10 percent of all the carbon stored by the world's oceans. They are also able to capture carbon from the atmosphere up to 35 times faster than tropical rainforests such as the Amazon.

Seagrasses are great but this is false. Most carbon in the ocean is dissolved inorganic carbon and seagrass carbon is a tiny fraction of that. The mixing of stock and flux is also unhelpful. The only way to stop climate change is not burning fossil fuels.

reasonstobecheerful.world/seagrass-res...

Does ocean model resolution change how fast CO₂ equilibrates with the air?
In our new study with @bachlennart.bsky.social and @mtyka.bsky.social, we found small resolution effects but large inter-model spreads —highlighting the next goal for improving mCDR predictions. link: doi.org/10.1029/2024...

Evaluating ocean alkalinity enhancement for carbon dioxide removal: evidence from a one-year saltmarsh field experiment Abstract. Ocean alkalinity enhancement is a promising carbon dioxide removal (CDR) strategy aimed at reducing atmospheric carbon dioxide (CO2) concentrations. To evaluate its effectiveness and potenti...

Interesting study by colleagues in Portugal.

Evaluating ocean alkalinity enhancement for carbon dioxide removal: evidence from a one-year saltmarsh field experiment
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egusphere.copernicus.org/preprints/20...

Persistent eastern equatorial Pacific Ocean upwelling since the warm Pliocene Upwelling generates a nutrient-rich “cold tongue” in the eastern equatorial Pacific Ocean (EEP), with impacts on global climate, oceanic biological productivity, and the carbon cycle. The cold tongue ...

Today, we published a study long in the making on how upper and subsurface tropical Pacific waters responded (and maybe will adjust) to warmer global climate. Here’s the story of how we got here after 15 years. many authors but shout out @jfarmersalmanac.bsky.social
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www.science.org/doi/10.1126/...

🌟 Postdoc Opportunity in Marine Biogeochemistry at CNRS-CEREGE!

🚢 Are you a passionate researcher ready to tackle climate change? Dive into the ERC-funded Deep-C project in Aix-en-Provence, France!

⬇️

Frontiers | Regional ocean biogeochemical modeling challenges for predicting the effectiveness of marine carbon dioxide removal Effectively scaling diverse marine carbon dioxide removal (mCDR) technologies from pilot-scale demonstrations to industrial-scale deployments requires a quan...

New mCDR papers this month:

www.frontiersin.org/journals/cli...

www.frontiersin.org/journals/env...

Thanks again to @aaronferderer.bsky.social for going through this massive effort. I think this dataset is a noticeable step forward when it comes to mechanistically understanding phytoplankton responses to carbonate chemistry. More of that in the future!
Well done mate 🍻

7/n

To explore the data yourself use the tool below. Hopefully, journals find a way to include such tools at least in the online versions of the article. It can be very powerful to understand a dataset and make further use of it for your own research 🌊

a-ferderer.github.io/Interactive_...

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And OA?

Increased H+ (reduced pH) associated with OA reduces growth rate in all species, but differently between them. Some are very resilient, whereas others are more sensitive. OA would not "kill all diatoms" but may change their species composition (with implications for food webs).

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