An interactive tool to explore the efficiency of ocean alkalinity enhancement (OAE) to see how it will move through the ocean and result in carbon removal over time #alkalinity
Mixed feelings about the #agu24 Emiliani lecture
On the one hand, 
reconnect w old friends
On the other, the pivot from #paleoclimate, past #Carbon Cycle scientist, to VC backed #cdr through #alkalinity which might encourage and financially incentivize high sulfur marine fossil fuel use is...
RE: https://bsky.app/profile/did:plc:3hk5ev74yq7gm3ay4vd4nkf4/post/3ld2qlanx3222
@davidho
2. because your #alkalinityenhancement is not about NaOH which you're just returning to the sea, but about replacing chlorides with carbonates. again: what are you going to do with all that chlorine?
3. because to make sodium hydroxide you emit more #GHG #CO2 than you can absorb
so you don't need to spend money and time, especially advertising #alkalinity #cdr on social media. this is just another #greenwashing
New work by @bach_lennart
The experiments show that anthropogenic #alkalinity can strongly reduce the generation of natural alkalinity, thereby reducing additionality. This is because the #anthropogenic alkalinity increases the calcium carbonate saturation state, which reduces the dissolution of calcium #carbonate from sand, a natural alkalinity source.
There is a striking difference between land- and ocean-based #CDR.
Ocean CDR ideas like adding #alkalinity or artificial upwelling imply unprecedented intervention into ocean commons, with unknown impacts on ecosystems. #Monitoring, not to mention regulating, would be practicably challenging, because ocean waters move.
Land carbon cycle is already managed by agriculture, urbanization etc. Land CDR would be a mean of already ongoing carbon rebalancing.
A machine learning approach to freshwater analysis
https://phys.org/news/2023-06-machine-approach-freshwater-analysis.amp
If you haven’t read it yet, also check out this incredibly comprehensive overview on #alkalinity in #CMIP6 models, and improvements from CMIP5 to CMIP6 by Planchat et al, with Laurent Bopp, Lester Kwiatkowski and many others.
https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1041/
New preprint from our group on #alkalinity biases in Earth System Models, attribution to processes, and implications for simulations of ocean alkalinity enhancement.
Claudia Hinrichs et al. @awi @EuroGeosciences #OceanNETs #MarESys #NewPaper #negativeemissions #oceanography #CMIP6
The Tasmanian freshwater #alkalinity survey moves forward with some of the youngest samplers in action during summer holidays.
We have about 300 samples from rivers and creeks all over #Tasmania so far.
Highest value: 7426 micromol/kg
Lowest value: 12 micromol/kg
#citizenscience
Our new paper (with Jing He) on #ocean #alkalinity and #OAE / #mCDR is out: https://bg.copernicus.org/articles/20/27/2023/
We examine the sensitivity of pH and #CaCO3 sensitivity along different coasts as well as the equilibration timescale of #CO2 uptake.
For carbon dioxide removal (#CDR), does anyone else think of #EnhancedWeathering, which is usually thought of as a terrestrial technique, as just another way to eventually add #alkalinity to the #ocean so it's really ocean CDR and #OceanAlkalinityEnhancement (#OAE)?
#Frontier just announced the second round of #carbon #dioxide #removal (#CDR) purchases by #Stripe and #Shopify. One of the companies is Captura, which is supposedly doing "Direct Ocean Capture."
Removing CO₂ from seawater is not CDR (you have to wait until that seawater equilibrates with atmospheric CO₂) so I don't know how this is better than Ocean #Alkalinity Enhancement.
But I don't care. I want to see them build this thing exactly as it's rendered here.
It’s been a crazy morning. I’m a mad scientist testing #saltwater to make sure I can do the #coral move to the new #reef tank.
#Alkalinity has been so unstable throughout the week. I think the new system needs more surfaces coated with magnesium ions. My assumption is that I’m losing bicarbonate to rock /surface absorption in the larger tank.
