Climate Change Research ›› 2021, Vol. 17 ›› Issue (6): 664-670.doi: 10.12006/j.issn.1673-1719.2021.169

• Special Section on the Sixth Assessment Report of IPCC: WGI • Previous Articles     Next Articles

Climate system response to carbon dioxide removal

CAO Long()   

  1. Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310058, China
  • Received:2021-08-05 Revised:2021-09-21 Online:2021-11-30 Published:2021-10-09


The IPCC recently released the Six Assessment Report (AR6), addressing the most up-to-date physical understanding of the climate system and climate change. Climate system and the carbon cycle response to carbon dioxide removal is assessed in this report. Carbon dioxide removal (CDR) is a necessary component of the IPCC low emissions scenarios of SSP1-1.9 and SSP1-2.6 that keeps global warming from preventing 1.5℃ or 2.0℃. AR6 key assessment relevant to CDR are: CDR has the potential to removal CO2 from the atmosphere and durably store it in reservoirs (high confidence); If the amount of CO2 removed from the atmosphere exceeds anthropogenic CO2 emission, CDR would lead to net negative emissions, lowering atmospheric CO2 concentration and reversing surface ocean acidification (high confidence); CO2 sequestered from the atmosphere by CDR would be partially compensated by CO2 release from land and ocean carbon stores (very high confidence); If global net negative CO2 emissions were to be achieved and be sustained, the global CO2-induced surface temperature increase would be gradually reversed but other climate changes (such as sea level rise) would continue in their current direction for decades to millennia (high confidence). CDR methods can have potentially wide-ranging effects on biogeochemical cycles and climate, which can either weaken or strengthen the potential of these methods to remove CO2 and reduce warming, and can also influence water availability and quality, food production and biodiversity (high confidence).

Key words: Carbon dioxide removal (CDR), Climate change, Climate system response, Carbon cycle

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