loading page

Antarctic Ice Sheet freshwater discharge drives substantial Southern Ocean changes over the 21$^{st}$ century
  • +1
  • Tessa Gorte,
  • Nicole Suzanne Lovenduski,
  • Cara Nissen,
  • Jan Thérèse Maria Lenaerts
Tessa Gorte
University of Colorado Boulder

Corresponding Author:[email protected]

Author Profile
Nicole Suzanne Lovenduski
University of Colorado Boulder
Author Profile
Cara Nissen
University of Colorado Boulder
Author Profile
Jan Thérèse Maria Lenaerts
University of Colorado Boulder
Author Profile

Abstract

Multidecadal satellite observations indicate that the Antarctic Ice Sheet (AIS) is losing mass at an accelerating rate, potentially impacting many aspects of the coupled climate system. While previous studies have demonstrated the importance of AIS freshwater discharge for regional and global climate processes using climate model experiments, many have applied unrealistic freshwater forcing. Here, we explore the potential Southern Ocean impacts of realistic AIS mass loss over the 21$^{st}$ century in the Community Earth System Model version 2 (CESM2) by applying observation-based historical and ice sheet model-based future AIS freshwater forcing. The added freshwater reduces wintertime deep convective area by 72\% while retaining 83\% more sea ice. Congruent with other studies, we find the increased freshwater discharge extensively impacts local and remote Southern Ocean surface and subsurface temperature and stratification. These results demonstrate the necessity of accounting for AIS mass loss in global climate models for projecting future climate.
23 Jun 2023Submitted to ESS Open Archive
25 Jun 2023Published in ESS Open Archive