Sources of seasonal sea-ice bias for CMIP6 models in the Hudson Bay Complex

• DOI: 10.1017/aog.2023.42
• Publication Date: 2023-08-03T07:23:01Z
• Authors: Alex D. Crawford; Erica Rosenblum; Jennifer V. Lukovich; Julienne C. Stroeve
• Keywords: Meteorology. Climatology; 0207 environmental engineering; sea-ice growth and decay; 02 engineering and technology; QC851-999; Ice and climate; sea ice

Abstract The seasonal ice-free period in the Hudson Bay Complex (HBC) has grown longer recent decades response to warming, both from progressively earlier sea-ice retreat summer and later advance fall. Such changes disrupt HBC ecosystem ice-based human activities. In this study, we compare 102 simulations 37 models participating phase 6 of Coupled Model Intercomparison Project satellite passive microwave record atmospheric reanalyses. We show that, throughout HBC, simulate an that averages 30 d than observations. This occurs because is unrealistically late early. find much ice-season bias can be linked a warm atmosphere associated with southerly wind bias, especially summer. Many also exhibit easterly during winter spring, which reduces convergence on east side impacts spatial patterns retreat. These results suggest for many models, more realistic simulation circulation would improve their sea ice.