"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."
𧡠1/6
"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
"#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
"Thus, a more aggressive #StratosphericAerosolInjection strategy may be required to rapidly stabilize permafrost extent," research concluded.
4/6
Read the preprint entitled: "Stratospheric aerosol injection to stabilize Northern Hemisphere terrestrial permafrost under the ARISE-SAI-1.5 scenario" here β¬οΈ authorea.com/users/614825/aβ¦
2οΈβ£π A recent preprint published in @researchsquare journal reveal that, "#SolarShading could be an effective way to stabilize the #polar cryosphere. However, it has a strong impact on the hydrological cycle."
"The discussion of energy consumption for cryogenic & combined #DirectAirCapture systems is explored in the newly published thesis."ποΈ
Details are discussed in aπ§΅β¬οΈ
1/10
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
3οΈβ£ base systems studied:
πΈ NC (no precompression/turbine recovery)
πΈPC (precompression only)
πΈTR (precompression & turbine recovery)
at 3οΈβ£ different compression ratios, n=400, 800 & 2000.
Then, a combination #DAC system, PSA, was modeled."
3/10
"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
"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𧡠1/9
"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
"In the model, a 2.1% globally uniform #SolarReduction can largely compensate the global mean warming caused by a doubling of CO2." 3/9
"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."π§΅
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. β¬οΈ 2/7
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
A recent study "uses a lightweight integrated assessment #model SCORE to explore possible scenarios using #CarbonDioxideRemoval for limiting #GlobalWarming to 1.5 Β°C by 2100."
𧡠1/9
"Particularly, this exploration quantify the impacts of relying on #CDR when accounting for:
1οΈβ£ possible under- and overestimation of the cost, potential, and availability (feasibility) of future CDR and
2οΈβ£ 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 Β°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