Siv K Lauvset

The ICOS OTC pCO2 instrument intercomparison In 2021, the Ocean Thematic Centre of the European Research Infrastructure “Integrated Carbon Observation System” conducted an international partial pressure of carbon dioxide (pCO2) instrument inter...

Must read paper on pCO₂ measurements, especially for MRV of mCDR. Some key points:

Equilibrator-based instruments require more expertise but give much better results.

For membrane/in situ instruments, you could get significantly different results from instruments from the same manufacturer. 🙀🌊

Come work with us 🌊

🌊There is an available position as a postdoc at NORCE in ocean biochemical modelling fixed for a period of 2 years in Bergen.

The position will be affiliated with the Bjerknes Centre and is a part of OceanICU project.

🧪Read more and apply here: www.jobbnorge.no/en/available...

Impacts of the CICE sea ice model and ERA atmosphere on an Antarctic MetROMS ocean model, MetROMS-UHel-v1.0 Abstract. In recent years, the Antarctic sea ice has experienced major changes, which are neither well understood nor adequately reproduced by Earth system models. To support model development with an...

🚨New GMD publication alert!🚨 🌊
Understanding the changing #Antarctic #SeaIce using MetROMS-UHel-v1.0, by Cecilia Äijälä and colleagues
gmd.copernicus.org/articles/18/...

Changes to NOAA databases and products below 🌊

Postdoc position available studying the biological carbon pump within Jan Taucher's team at GEOMAR
🌊

www.geomar.de/en/karriere/...

Postdoctoral Fellow in Marine Carbon Cycle Science (275511) | University of Bergen Job title: Postdoctoral Fellow in Marine Carbon Cycle Science (275511), Employer: University of Bergen, Deadline: Thursday, March 6, 2025

Exciting job opportunity to work with ICOS-Norway in Bergen 🌊
www.jobbnorge.no/en/available...

The land–ocean Arctic carbon cycle - Nature Reviews Earth & Environment Anthropogenic warming is perturbing the Arctic carbon cycle. This Review provides an overview of contemporary carbon stocks and fluxes across terrestrial, aquatic and oceanic components of the integra...

I am happy and grateful that I could contribute and work on this extensive review of the carbon cycle across the Arctic land-ocean aquatic continuum. 🏞️ 🌊

Have a look! The Arctic is such an amazing and interesting fast changing region in the world!

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

More shameless self promotion: Visit 0240 in the #agu24 poster hall this foggy Tuesday afternoon!

Assistant Professor (Tenure Track) of Geomitigation of Greenhouse Gases

@eth-eaps.bsky.social is looking for an assistant professor to work on CO₂ removal (CDR). They say greenhouse gas but I don’t think we’re removing atmospheric CH₄ or N₂O. Lots of great people at ETH. Do apply by the end of this month! 🌊🧪

The image depicts a phase diagram illustrating the relationship between total alkalinity and dissolved inorganic carbon in aquatic systems. Key processes such as photosynthesis, respiration, and CaCO₃ formation and dissolution are labeled, with arrows indicating the directions of alkalinity addition.

For those who are not marine chemists, this is the easiest way to see how adding alkalinity to the ocean lowers pCO₂ without changing dissolved inorganic carbon and potentially allows the ocean to take up more atmospheric CO₂. 🌊

A picture of the earth showing the pacific ocean. You can see hawaii and New Zealand. Also the edge of antarctica, australia, and north and south america...but barely.

It’s interesting that the emojis show the earth from three angles 🌎 🌍 🌏 but not the fourth.

Though 🔵 is a fair approximation of what it would look like.

People underestimate the Pacific.

Differential impacts of pH on growth, physiology, and elemental stoichiometry across three coccolithophore species Coccolithophores are pivotal players in ocean biogeochemistry, yet the impact of changing pH on the physiology of different species remains unclear as there has been a dominant focus on Gephyrocapsa ...

How does ocean acidification affect coccolithophores? 🌊:
(i) High CO2 (low pH) reduces growth rates by up to 87% (Ghux).
(i) Coccolith formation is disrupted with malformed structures at extreme pH (C. braarudii).
(ii) Carbon export capacity declines as PIC:POC ratios drop.
doi.org/10.1002/lno....

Could the AMOC collapse and Bergen become 20 degrees colder (imagine the snow we would get!)? This and more in the latest Bjerknes podcast.

Effects of Mesoscale Eddies on Southern Ocean Biogeochemistry Cyclonic eddies pump dissolved inorganic carbon and nitrate upward, leading to less oceanic carbon uptake (anticyclones opposite) Cyclonic eddies pump low-oxygen water upward (anticyclones opposi...

🌊 News from Lydi Keppler et al.:
Mesoscale Eddies in the Southern Ocean tend to stimulate the CO₂ uptake in this key region for the carbon exchange between ocean and atmosphere.
👇
doi.org/10.1029/2024...

Drivers of decadal trends in the ocean carbon sink in the past, present, and future in Earth system models Abstract. The ocean and the land biosphere are the two major sinks of anthropogenic carbon at present. When anthropogenic carbon emissions become zero and temperatures stabilize, the ocean is projecte...

After the migration to Bluesky, I thought it is time to re-share the findings of my most recent 🌊 paper:

Decadal trends in the ocean CO2 sink are mostly driven by changes in the atmospheric CO2 growth rates on decadal timescales!

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

Position open at ICOS ocean thematic centre in Bergen 🌊

A cartoon depicting a person (labeled “us”) poking an illustrated green dragon labeled "ANGRY BEAST" with a stick. The quote from Wally Broecker, "Climate is an angry beast and we are poking at it with sticks," is included at the top.

Today, Wally Broecker would have been 93. He was obsessed with abrupt climate change that arrives suddenly and dramatically.

He likened the cli­mate system to an "angry beast", and said we shouldn't poke it (i.e., keep emitting CO₂) because we don't know how and when it'll react.

We should listen.

Current Vacancies

Lecturer or Senior Lecturer in Marine Spatial Science at the Institute for Marine and Antarctic Studies (University of Tasmania, Australia). Closes 30 Nov (details in link below)
🐟🦑🧪

@utas.bsky.social careers.utas.edu.au/ci/en/job/50...

56th International Liège Colloquium on Ocean Dynamics The Liège Colloquium is organized as a plenary event. Talks and posters will be organized within the following sessions (see the Overview for more details)

To everyone interested in marine CO2 removal (#mCDR). There is an important meeting coming up in Liege (Belgium) next year, 26-30 May (2025).

🌊

www.ocean-colloquium.uliege.be/cms/c_142299...

Global and National CO2 Uptake by Cement Carbonation from 1928 to 2024 Abstract. The hydration products of cement materials can absorb atmospheric CO2, and this carbonation process provides an important decarbonization pathway for the cement industry. Global carbon seque...

New paper in open review. A continuation of work on extending and improving estimates for carbonation (uptake of carbon) by cement products worldwide.

People Looking for two postdocs (SOCCOM and InMOS), details below. I am not currently planning to take on new students in Fall 2025. HI Cycles group at the 10th annual SOCCOM meeting at Princeton Universi…

Two postdoc positions in my group are opening: First is part of SOCCOM3 (3 years, NSF funded, S. Ocean carbon/oxygen/nutrient budgets), Second is part of InMOS (4.25 yrs, Schmidt Sciences / OBVI funded, long-term oxygen/carbon flux and inventory constraints). More info: bushinskyoceanlab.org/people/

Céline Heuzé får pris för forskning om havets komplexitet i klimatmodeller Céline Heuzé, docent i klimatvetenskap vid Göteborgs universitet, tilldelas Birger Karlssons vetenskapspris av Kungl. Vetenskaps- och Vitterhets-Samhället i Göteborg (KVVS). Priset delas ut vid KVVS å...

It's official: I received a science prize from the Royal Society of Arts and Sciences in Gothenburg 🥳
...for my "mild" obsession with #CMIP

More information, in Swedish only ->
www.gu.se/nyheter/celi...

Inefficient transfer of diatoms through the subpolar Southern Ocean twilight zone - Nature Geoscience Diatom skeletons largely remain near the surface of the subpolar Southern Ocean following diatom bloom events, suggesting that they do not play as big a role in the downward flux of organic matter as ...

Interesting paper that suggests diatoms are not as well exported from the upper ocean as we might have thought … 🌊

‘Inefficient transfer of diatoms through the subpolar Southern Ocean twilight zone’
www.nature.com/articles/s41...

Progression of ocean interior acidification over the industrial era The rapid downward progression of anthropogenic carbon accelerates ocean interior acidification and threatens marine biota.

Ocean Acidification is reshaping life and biogeochemical cycles.
In our latest study, Niki Gruber and I reconstructed its progression in the global ocean interior over the industrial era, based on our previous estimates of anthropogenic carbon accumulation.
doi.org/10.1126/scia...

A 🧵about the 🌊...

Even if CO₂ emissions decreased as much as it did during COVID every year until 2030, we would still miss the 1.5°C target (emissions of 20 GtCO₂/yr by 2023) by a lot.

Want to make a difference? Come work here! Miami needs ocean and climate scientists.

Ocean liming effects on dissolved organic matter dynamics Abstract. Ocean liming has gained attention as a potential solution to mitigate climate change by actively removing carbon dioxide (CO2) from the atmosphere. The addition of hydrated lime to oceanic s...

I've been fighting ocean tech bros calling the stripping of CO₂ from seawater "Direct Ocean Capture (DOC)", just because it sounds like Direct Air Capture. Call it Direct Ocean Removal (DOR) because DOC is dissolved organic carbon to oceanographers.

Here's an article about mCDR and the real DOC. 🌊

Nearly all developed countries report all their forests as 'managed', which means they report all carbon uptake in forests even if it was caused by climate change (CO2 fertilisation). Is this a problem?

More on this later today (article coming)

Meanwhile: www.ipcc-nggip.iges.or.jp/public/mtdoc...

How long does CO₂ have to be stored in #CarbonDioxideRemoval #CDR? At least 35 years? 100 years? Longer?🤔
In a new study, @hausfath.bsky.social, @retoknutti.bsky.social & I find that for #netzero CO₂, anything less than 1000 years is not enough to neutralize warming.🧵
www.nature.com/articles/s43...