![](https://mosaic-expedition.org/wp-content/uploads/2020/03/20191110_estherhorvath_mosaicleg1-025-1200x675.png)
Satellite observation is the only way to effectively monitor the Arctic sea ice on a broad scale. Yet this approach still has its fair share of weaknesses. Unparalleled control measurements gathered during the MOSAiC expedition will now help to overcome them.