https://meetingorganizer.copernicus.org/EGU2020/EGU2020-1740.html?s=09
Solar Radiation Modification Slows Down Permafrost Carbon Loss
Yangxin Chen and Duoying Ji
Circumpolar permafrost is degrading under anthropogenic global warming,
thus the large amount of soil organic carbon in it would be vulnerable to
microbial decomposition and further aggravating future warming. However,
solar radiation modification (SRM), as a theoretical approach to reducing
some of the impacts of anthropogenic climate change, hopefully could
mitigate the permafrost degradation and slow down permafrost carbon loss.
Here we use two solar geoengineering experiments came up in CMIP6/GeoMIP6
-- G6solar and G6sulfur, to explore changes in circumpolar permafrost
carbon under solar radiation modification scenarios. Earth system models'
simulations show that under G6 scenarios, annual mean surface air
temperature in circumpolar permafrost region is about 5℃ lower relative to
the high forcing scenario SSP5-8.5 by year 2100, with a growing trend but
remains below 0℃ from 2015 to 2100, which is close to that in the medium
forcing scenario SSP2-4.5. The lower temperature causes lower degradation
rate of permafrost area. In SSP5-8.5 scenario, almost all the permafrost
thaws by year 2100, but up to half of it remains frozen in SSP2-4.5 and G6
scenarios compared to year 2015. The lower temperature also results in less
carbon assimilation in this area, thus the lower vegetation carbon
accumulation. By 2100, a maximum soil carbon loss of 18.09 PgC under
SSP5-8.5 scenario regarding to different model constructions, while in G6
the soil carbon loss could be reduce to 3.70 PgC, even less than that of
5.29 PgC in SSP2-4.5 scenario.
How to cite: Chen, Y. and Ji, D.: Solar Radiation Modification Slows Down
Permafrost Carbon Loss , EGU General Assembly 2020, Online, 4–8 May 2020,
EGU2020-1740, https://doi.org/10.5194/egusphere-egu2020-1740, 2019
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