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Geoengineering Info Profile picture
@geoengineering1
May 12 • 7 tweets • 6 min read Twitter logo Read on Twitter
🚨NEW REVIEW PAPER🚨

"International C markets are a very potent tool for mobilizing #CarbonDioxideRemoval in line with Paris Agreement ambitions to limit global warming to well below 2°C. Yet, C market regulators have not systematically approached removals."
#NetZero
#CDR

🧵1/7 Image
So, a review paper recently published "assesses the highly fragmented treatment of #removals under compliance and #VoluntaryCarbonMarkets, including baseline, credit and cap-and-trade systems."
2/7 Image
"The Kyoto mechanisms and the large #VoluntaryCarbonMarket standards have long focussed on biological removals without inherent storage permanence and only recently started to develop methodologies for removals with #geological storage, #mineralization or #biochar."
3/7 Image
"Driven by high prices for credits from emerging #removal technologies and advance market commitment initiatives targeting high permanence removals, various newcomers in #VoluntaryCarbonMarkets are currently establishing their own approaches for generating removal credits."
4/7 Image
"Given the diversity of credit prices spanning 3 orders of magnitude from 1-1000, the current “gold rush” atm of removal markets needs to quickly be replaced by coordinated approach, ensuring credibility & enabling removals to play the vital role in reaching global #NetZero."
5/7
Read the open-access paper entitled: "International carbon markets for carbon dioxide removal" here ⬇️
journals.plos.org/climate/articl…
@HoneggerM

#CarbonDioxideRemoval
#VoluntaryCarbonMarket
#InternationalCarbonMarket

6/7
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More from @geoengineering1

Geoengineering Info Profile picture
May 14
🚨✍️𝐍𝐄𝐖 𝐃𝐎𝐂𝐓𝐎𝐑𝐀𝐋 𝐓𝐇𝐄𝐒𝐈𝐒✍️🚨

"The discussion of energy consumption for cryogenic & combined #DirectAirCapture systems is explored in the newly published thesis."🎛️

Details are discussed in a🧵⬇️
1/10 ImageImage
In this novel approach, "a thermodynamic model was constructed using psychometric theories to model the #desublimation of CO2 in a #DAC system. The system was modeled
to include a precooling heat exchanger & a deposition chamber where the desublimation
of CO2 occurs."
2/10 Image
3️⃣ base systems studied:
🔸 NC (no precompression/turbine recovery)
🔸PC (precompression only)
🔸TR (precompression & turbine recovery)
at 3️⃣ different compression ratios, n=400, 800 & 2000.
Then, a combination #DAC system, PSA, was modeled."
3/10 Image
Read 10 tweets
Geoengineering Info Profile picture
May 14
🚨📝𝐍𝐄𝐖 𝐏𝐀𝐏𝐄𝐑📝🚨

A recent study used "an Earth system model to examine the response of #OceanAcidification to idealized atmospheric #CarbonDioxideRemoval scenarios."

Details in a 🧵below ⬇️
1/8 Image
"In the simulations, atmospheric CO2 is assumed to increase at a rate of 1% per year to four times its pre-industrial value and then decreases to the pre-industrial level at a rate of 0.5%, 1%, 2% per year, respectively."
2/8
Results show that "the annual mean state of surface ocean #carbonate chemistry fields including [H+] conc., pH & aragonite saturation state respond quickly to removal of atmospheric CO2. Yet, the change of seasonal cycle in CaCO3 chemistry lags behind the decline in atm CO2."
3/8
Read 8 tweets
Geoengineering Info Profile picture
May 13
🚨NEW PAPER🚨

"The potential climate impact of #SolarGeoengineering is examined in a recent study using climate model simulations by artificially reducing the incoming solar radiation at the top of the atmosphere."
#ClimateEngineering
#SolarShading

Results discussed in a🧵
1/9 ImageImage
"Climate scenario simulations reveal that a doubling of atmospheric CO2 induces a surface temperature rise which is amplified over the poles primarily during the respective winter. The warming also causes intensification & poleward shift of the global precipitation pattern."
2/9 ImageImage
"In the model, a 2.1% globally uniform #SolarReduction can largely compensate the global mean warming caused by a doubling of CO2."
3/9 ImageImage
Read 9 tweets
Geoengineering Info Profile picture
May 13
🚨NEW PAPER🚨

"Utilization of biochar as a cementitious material aids in CO2 sequestration by impeding the release of C in the atm. So, a recent study reviewed the prospect of #biochar as a #cementitious material by evaluating its physical, mechanical & durability properties."🧵 ImageImage
This research suggested that "the physical properties of #biochar promote its use as an environmental control device."
A summary of the preparation and characterization of biochar is presented in a Fig. ⬇️
2/7 Image
According to the study, #pozzolan is a siliceous & aluminous material
that chemically reacts with Ca(OH)2 at room temp to form compounds having #cementitious attributes. So, some of the silica-rich biochars, like the ones derived from #RiceHusk have pozzolanic properties."
3/7 ImageImage
Read 7 tweets
Geoengineering Info Profile picture
May 13
🚨NEW PAPER🚨

A recent study "uses a lightweight integrated assessment #model SCORE to explore possible scenarios using #CarbonDioxideRemoval for limiting #GlobalWarming to 1.5 °C by 2100."

🧵
1/9 Image
"Particularly, this exploration quantify the impacts of relying on #CDR when accounting for:
1️⃣ possible under- and overestimation of the cost, potential, and availability (feasibility) of future CDR and
2️⃣ the compound effect with uncertainty in climate sensitivity."
2/9
"All scenario results show that aggressive near-term mitigation is required for limiting warming to 1.5 °C by 2100 for all levels of climate sensitivity, but that some amount of #CDR is likely required in the future even if climate sensitivity turns out to be extremely low."
3/9
Read 9 tweets
Geoengineering Info Profile picture
May 12
🚨NEW PAPER🚨

"Permafrost contains vast stores of SOC. #StratosphericAerosolInjection may deter tipping points that lead to widespread permafrost thaw & C release by cooling surface & soil temp, but it is unclear if/when permafrost could stabilize after #SAI deployment."

🧵
1/6 Image
"Using the ARISE-SAI-1.5 simulations, we show that the rate of permafrost thaw begins to stabilize under #StratosphericAerosolInjection, but does not fully stop, likely due to deep permafrost thaw processes that are resistant to surface temperatures changes."
2/6 Image
"#StratosphericAerosolInjection does prevent a potential tipping point (talik formation) in almost 2 million km2 of #permafrost, most of which is located in permafrost peatlands."
3/6 ImageImage
Read 6 tweets

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