A large-scale low pressure system that exists almost all year round between Iceland and Greenland in the subpolar low pressure zone of the Northern Hemisphere. It is most developed in winter, covering northern Europe, northern Canada, and parts of the Arctic Ocean. In summer, it retreats and moves south due to the development of a fairly wide high pressure area in the central Arctic Ocean. This low pressure system affects the weather throughout the Northern Hemisphere. In particular, in winter, a group of low pressure systems moving from North America and the western North Atlantic to Europe is most dominant south of Iceland, bringing wind and rain to northern and central Europe. In summer, they are weaker and less frequent than in winter. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
北半球の亜寒帯低圧帯のうち,アイスランドとグリーンランドの間にほぼ一年中存在する大規模な低気圧。冬季に最も発達し,北ヨーロッパ,北部カナダと北極海の一部を覆う。夏季には北極海の中央部にかなり広い高圧部が発達するために後退し,南下する。この低気圧は北半球全体の天候に影響を与える。特に冬季に,北アメリカ大陸や北大西洋の西部地方からヨーロッパへ移動してくる低気圧群はアイスランド南方で最も優勢となり,北ヨーロッパや中央ヨーロッパに風雨をもたらす。夏季は冬季に比べると弱くなり,数も少なくなる。
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