Contributions of aerosol-cloud interactions to mid-Piacenzian seasonally sea ice-free Arctic Ocean Academic Article uri icon

abstract

  • AbstractForcings and feedbacks controlling the seasonally sea icefree Arctic Ocean during the midPiacenzian Warm period (3.2643.025 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 aerosolcloud interactions and the exclusion of industrial pollutants from model forcing conditions is key to simulating seasonally sea icefree Arctic Ocean of MPWP. The absence of industrial pollutants leads to fewer and larger cloud droplets over the highlatitude 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 icefree Arctic Ocean and strongly amplified northern highlatitude surface warmth.

published proceedings

  • GEOPHYSICAL RESEARCH LETTERS

altmetric score

  • 0.25

author list (cited authors)

  • Feng, R., Otto-Bliesner, B. L., Xu, Y., Brad, E., Fletcher, T., & Ballantyne, A.

citation count

  • 18

complete list of authors

  • Feng, Ran||Otto-Bliesner, Bette L||Xu, Yangyang||Brad, Esther||Fletcher, Tamara||Ballantyne, Ashley

publication date

  • August 2019