Why do some icebergs pose a danger to ships near Newfoundland and Labrador?

Icebergs pose a significant danger to ships near Newfoundland and Labrador primarily because they are transported into busy shipping lanes by the Labrador Current.1

The hazards are multifaceted:

• Detection Challenges: While large icebergs can be detected by radar or visually, decaying bergs often shed smaller fragments known as "growlers" and "bergy bits." These pieces can weigh up to 5,400 tons and are capable of damaging or sinking vessels. Furthermore, in heavy seas, the smooth, wetted surfaces of icebergs can produce a low radar cross-section, making them difficult to distinguish from sea foam and whitecaps.1
• Unpredictable Behavior: As icebergs melt and lose mass, they frequently roll over, which can cause them to change shape and stability unexpectedly. This makes predicting their exact trajectory and behavior difficult for mariners.21
• Shipping Density: The region serves as a critical transit point where icebergs from the Arctic enter North Atlantic shipping lanes. Because ships may maneuver to avoid a large, visible parent iceberg, they may inadvertently place themselves in greater danger from smaller, less visible fragments drifting nearby.1

To mitigate these risks, the International Ice Patrol tracks iceberg movements and provides regular reports to vessels in the area.1