Global Warming Threshold and Mechanisms for Accelerated Greenland Ice Sheet Surface Mass Loss.

ABSTRACT: The Community Earth System Model version 2.1 (CESM2.1) is used to investigate the evolution of the Greenland ice sheet (GrIS) surface mass balance (SMB) under an idealized CO₂ forcing scenario of 1% increase until stabilization at 4× pre-industrial at model year 140. In this simulation, the SMB calculation is coupled with the atmospheric model, using a physically based surface energy balance scheme for melt, explicit calculation of snow albedo, and a realistic treatment of polar snow and firn compaction. By the end of the simulation (years 131-150), the SMB decreases with 994 Gt yr^-1 with respect to the pre-industrial SMB, which represents a sea-level rise contribution of 2.8 mm yr^-1. For a threshold of 2.7-K global temperature increase with respect to pre-

SUBMITTER: Sellevold R 

PROVIDER: S-EPMC7540049 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature