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Impact of Regional Marine Cloud Brightening Interventions on Climate Tipping Points
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  • Haruki Hirasawa,
  • Dipti Swapnil Hingmire,
  • Hansi Alice Singh,
  • Philip J. Rasch,
  • Peetak Mitra
Haruki Hirasawa
University of Victoria

Corresponding Author:hhirasawa@uvic.ca

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Dipti Swapnil Hingmire
University of Victoria
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Hansi Alice Singh
University of Victoria
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Philip J. Rasch
Pacific Northwest National Laboratory (DOE)
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Peetak Mitra
Palo Alto Research Center
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It has been proposed that increasing greenhouse gas (GHG)-driven climate tipping point risks may prompt consideration of Solar Radiation Modification (SRM) climate intervention to reduce those risks. Here, we study marine cloud brightening (MCB) SRM interventions in three subtropical oceanic regions using the Community Earth System Model 2 (CESM2) experiments. We assess the response of tipping point-related metrics to estimate the extent to which such interventions could reduce tipping point risk. Both the pattern and magnitude of the MCB cooling depend strongly on location of the MCB intervention. We find the MCB cooling effect reduces tipping point risk overall; however, the distinct pattern effects of MCB versus GHG means it is an imperfect remedy. Indeed, if MCB is applied in certain oceanic regions, it may exacerbate some tipping point risks. It is therefore crucial to carefully assess the potential remote teleconnected response to MCB interventions to reduce unintended climate impacts.
18 Sep 2023Submitted to ESS Open Archive