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#mcdr

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Jean-Pierre Gattuso 🇪🇺🇺🇦🍉

‼️Check out our new paper led by Phil Boyd on « The need to explore the potential of marine CDR – A guide for policy makers » with Minhan Dai, Louis Legendre, Terre Satterfield and Romany Webb. Thanks are due to Peter Thomson for his suggestion to produce this policy brief. Hopefully, it will be useful for discussion at the #OneOceanScience congress and #UNOC3 in Nice, France, June 2025.
#mCDR

doi.org/10.5281/zenodo.1469265

ZenodoThe need to explore the potential of marine CDR – A guide for policy makers
Public
Mike Tyka

Our new paper on mapping the Ocean Alkalinity Enhancement (OAE) Efficiency across the global ocean: #mcdr #cdr #co2

rdcu.be/dZyxW

We ran pulsed alkalinity simulations in 690 different locations and 4 different seasons for a total of 2760 runs.

We found strong seasonality in subtropical and polar regions. Subpolar regions equilibrate the fastest and most complete. Equatorial regions are the slowest but eventually reach near-complete equilibration after 15 years. 1/

Public
David Ho

Some great questions and answers on marine carbon dioxide removal () during this House Science, Space, and Technology Committee hearing, "Navigating the Blue Frontier: Evaluating the Potential of Marine Carbon Dioxide Removal Approaches".

youtube.com/live/P5HHQ7cXgeY?s

YouTubeNavigating the Blue Frontier: Evaluating the Potential of Marine Carbon Dioxide Removal ApproachesBy House Science, Space, and Technology Committee
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Jean-Pierre Gattuso 🇪🇺🇺🇦🍉

The article can be read in English using the Translate function of Chrome and registering for free.
#CDR #mCDR
heimildin.is/grein/22132/sokkt (3/3)

Heimildin · Sökktu kurli og seldu syndaaflausn„Ýttu á takk­ann og bjarg­aðu heim­in­um,“ skrif­ar vís­inda­mað­ur af kald­hæðni er hann bend­ir um­hverf­is­ráðu­neyt­inu á var­úð­ar­orð ut­an úr heimi um að­ferð­ir sem fyr­ir­tæk­ið Runn­ing Tide fékk leyfi stjórn­valda til að prófa í þágu lofts­lags í Ís­lands­höf­um. Að­gerð­irn­ar umbreytt­ust í allt ann­að en lagt var upp með. Þær voru án alls eft­ir­lits og gerðu svo þeg­ar upp var stað­ið lít­ið ef nokk­urt gagn. „Ísland er fyrsta landið í heiminum til að búa til kolefniseiningar með kolefnisbindingu í hafi,“ sagði framkvæmdastjórinn.
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Jean-Pierre Gattuso 🇪🇺🇺🇦🍉

These methods are often promoted without a proper understanding of the marine carbon cycle and the processes needed for successful upscaling. This lack of knowledge threatens the validity of carbon offset initiatives. Additionally, focusing solely on CO2 removal overlooks the many non-climatic benefits of ocean-based approaches, which can exceed their CO2 capture capabilities.

#mCDR #climate #ocean #CO2
doi.org/10.1088/1748-9326/ad50 (4/4)

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Mike Tyka

Our new paper on mapping the Ocean Alkalinity Enhancement (OAE) Efficiency across the global ocean: #mcdr #cdr #co2

researchsquare.com/article/rs-

We ran pulsed alkalinity simulations in 690 different locations and 4 different seasons for a total of 2760 runs.

We found strong seasonality in subtropical and polar regions. Subpolar regions equilibrate the fastest and most complete. Equatorial regions are the slowest but eventually reach near-complete equilibration after 15 years.

Public *
Jean-Pierre Gattuso 🇪🇺🇺🇦🍉

A comprehensive assessment of electrochemical ocean alkalinity enhancement in seawater: kinetics, efficiency, and precipitation thresholds

Ringham M., Hirtle N., Shaw C., Lu X., Herndon J., Carter B. & Eisaman M., 2024. EGUsphere
#mCDR #OAE
egusphere.copernicus.org/prepr

egusphere.copernicus.orgA comprehensive assessment of electrochemical ocean alkalinity enhancement in seawater: kinetics, efficiency, and precipitation thresholdsAbstract. Ocean alkalinity enhancement (OAE) is a promising approach to marine carbon dioxide removal (mCDR) that leverages the large surface area and carbon storage capacity of the oceans to sequester atmospheric CO2 as dissolved bicarbonate (HCO3-). The SEA MATE (Safe Elevation of Alkalinity for the Mitigation of Acidification Through Electrochemistry) process uses electrochemistry to convert some of the salt (NaCl) in seawater or brine into aqueous acid (HCl), which is removed from the system, and base (NaOH), which is returned to the ocean with the remaining seawater. The resulting increase in seawater pH and alkalinity causes a shift in dissolved inorganic carbon (DIC) speciation toward carbonate and a decrease in the surface-ocean pCO2. The shift in the pCO­2 results in enhanced CO2 uptake or reduced CO2 loss by the seawater due to gas exchange. The net result of this process is the increase of surface-ocean DIC, where it is durably stored as mostly bicarbonate and some carbonate. In this study, we systematically test the efficiency of CO2 uptake in seawater treated with NaOH at beaker (1 L), aquaria (15 L), and tank (6000 L) scales to establish operational boundaries for safety and efficiency in scaling up to field experiments. Preliminary results show CO2 equilibration occurred on order of weeks to months, depending on circulation, air forcing, and air bubbling conditions within the test tanks. An increase of ~0.7–0.9 mol DIC/ mol added alkalinity (in the form of NaOH) was observed through analysis of seawater bottle samples and pH sensor data, consistent with the value expected given the values of the carbonate system equilibrium calculations for the range of salinities and temperatures tested. Mineral precipitation occurred when the bulk seawater pH exceeded 10.0 and Ωaragonite exceeded 30.0. This precipitation was dominated by Mg(OH)2 over hours to 1 day before shifting to CaCO3, aragonite precipitation. These data, combined with models of the dilution and advection of alkaline plumes, will allow for estimation of the amount of carbon dioxide removal expected from OAE pilot studies. Future experiments should better approximate field conditions including sediment interactions, biological activity, ocean circulation, air-sea gas exchange rates, and mixing-zone dynamics.
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