Edge displacement scores

• Main Author: Melsom, Arne
• Format: Text
• Language: English
• Published: 2021
• Subjects: Arctic; Sea ice
• Online Access: https://doi.org/10.5194/tc-2020-361; https://tc.copernicus.org/preprints/tc-2020-361/

As a consequence of a diminishing sea ice cover in the Arctic, activity is on the rise. The position of the sea ice edge, which is generally taken to define the extent of the ice cover, changes in response to dynamic and thermodynamic processes. Forecasts for sea ice expansion due to an advancing ice edge will provide information that can be of significance for operations in polar regions. However, the value of this information depends on the quality of the forecasts. Here, we present methods for examining the quality of forecasted sea ice expansion and the geographic location where the largest expansion are expected from the forecast results. The algorithm is simple to implement, and an examination of two years of model results and accompanying observations demonstrates the usefulness of the analysis.