How do continental polar Canadian air masses differ from the polar air masses form over the north Pacific ocean?

Continental polar air masses from Canada are characterized by cold, dry conditions as they originate over land, where they lose moisture. In contrast, polar air masses formed over the North Pacific Ocean are typically moist and can bring precipitation, as they gather moisture from the ocean. This moisture content results in different weather patterns when these air masses move into other regions, with continental polar air often leading to clear skies and colder temperatures, while Pacific polar air can contribute to cloudier and wetter conditions.