Seasonal transition dates can reveal biases in Arctic sea ice simulations

• Main Authors: Smith, Abigail, Jahn, Alexandra, Wang, Muyin
• Format: Text
• Language: English
• Published: 2020
• Subjects: Arctic; Sea ice
• Online Access: https://doi.org/10.5194/tc-2020-81; https://tc.copernicus.org/preprints/tc-2020-81/

Arctic sea ice experiences a dramatic annual cycle, and seasonal ice loss and growth can be characterized by various metrics: melt onset, break-up, opening, freeze onset, freeze-up and closing. By evaluating a range of seasonal sea ice metrics, CMIP6 sea ice simulations can be evaluated in more detail than by using traditional metrics alone, such as sea ice area. We show that models capture the observed asymmetry in seasonal sea ice transitions, with spring ice loss taking about 1.5–2 months longer than fall ice growth. The largest impacts of internal variability are seen in the inflow regions of melt and freeze onset dates, but all metrics show pan-Arctic model spreads exceeding the internal variability. Through climate model evaluation in the context of both observations and internal variability, we show that biases in seasonal transition dates can compensate for other unrealistic aspects of simulated sea ice. In some models, this leads to September sea ice areas in agreement with observations for the wrong reasons.