N a stretch of open water surrounded by ice, esp near the mouths of large rivers, in arctic seas 冰间湖
It is likely that the warm water consistently exits at these locations, but in years that are free of sea ice (like 2011), the polynyas aren't visible and so this cannot be confirmed from images.
有可能暖流一向在这几个地方冒出,但在没有海冰的年份里(例如2011),并不能看到冰穴,所以不能仅从图片上确认这一点。
Polynyas and the Pine Island Glacier, Antarctica.
南极洲的冰穴和松岛冰川。
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