Barrow Sea Ice Break Up
Dirty Ice is a known problem (quote):-
We define break-up as the first detected movement of landfast ice shoreward of grounded ridges within the 20 m-isobath off NARL, approximately 5 miles north of Barrow. Typically, movement is parallel to the coast, confined by grounded pressure ridges at the 20 m-isobath. However, we exclude ice affected by dust from town and a coastal road, i.e. the first approx. 100 m off shore. Typically, we detect movement from coastal RADAR and from Satellite imagery. In previous years, webcam images near NARL were available.
It is also interesting that pressure ridges can ground in 20m water depth (most years?), I saw someone was saying that ice off Siberia looked as if it had stopped moving in circa 10m water.