Contributions of aerosol-cloud interactions to mid-Piacenzian seasonally sea ice-free Arctic Ocean

Ran Feng, Bette L. Otto-Bliesner, Yangyang Xu, Esther Brady, Tamara Fletcher, Ashley Ballantyne

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Forcings and feedbacks controlling the seasonally sea ice-free Arctic Ocean during the mid-Piacenzian Warm period (3.264–3.025 Ma, MPWP), a period when CO2 level, geography, and topography were similar to present day, remain unclear given that many complex Earth System Models with comparatively higher skills at simulating twentieth century Arctic sea ice tend to produce perennial Arctic sea ice for this period. We demonstrate that explicitly simulating aerosol-cloud interactions and the exclusion of industrial pollutants from model forcing conditions is key to simulating seasonally sea ice-free Arctic Ocean of MPWP. The absence of industrial pollutants leads to fewer and larger cloud droplets over the high-latitude Northern Europe and North Pacific, which allows greater absorption of solar radiation at the surface during the early summer. This enhanced absorption triggers the seasonally runaway sea ice surface albedo feedback that gives rise to September sea ice-free Arctic Ocean and strongly amplified northern high-latitude surface warmth.

    Original languageEnglish
    Pages (from-to)9920-9929
    Number of pages10
    JournalGeophysical Research Letters
    Volume46
    Issue number16
    DOIs
    StatePublished - Aug 28 2019

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