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单词 Blocking high
释义

Blocking high

中文百科

阻塞高气压 Block (meteorology)

(重定向自Blocking high)
阻塞高气压影响时,地面会有强冷高压及温带气旋出现,气旋降水并会加强。
阻塞高气压和割离低气压出现的时期,称为阻塞形势,它们的正负涡度对比十分明显。

阻塞高气压是暖性高气压,长时间滞留在同一地方而且稳定;这些阻塞高气压持续时间多于5天,令受它们影响的区域有一段长时间相同的天气(如部分地区出现持续降水) 。 在北半球,阻塞高气压最常于东太平洋和大西洋的春天时出现。阻塞高压创建前,西风波动振幅会增加而波长缩短。完整环流及闭合等压线之高压由西风脊隆起加强发展而成,因振幅剧烈,通常与副极地低压一同出现。


阻塞高气压出现时,会令西风带出现异常型态,主要影响为西风气流分开南北两个支流,引致副极地低压南下,阻塞高气压附近引导气流弱,会阻碍地面天气系统移动,会间接引致起寒潮、暴雨等极端气候出现。

英语百科

Block (meteorology) 阻塞高气压

(重定向自Blocking high)
An example of an omega block over western North America in May 2006
Polar vortex and weather impacts due to stratospheric warming
An example of a rex block off the West coast of North America in January 2007
When warm air ahead of an oncoming storm system overrides cool air trapped east of a mountain range, cloudiness and precipitation can occur for prolonged periods of time

Blocks in meteorology are large-scale patterns in the atmospheric pressure field that are nearly stationary, effectively “blocking” or redirecting migratory cyclones. They are also known as blocking highs or blocking anticyclones. These blocks can remain in place for several days or even weeks, causing the areas affected by them to have the same kind of weather for an extended period of time (e.g. precipitation for some areas, clear skies for others). In the Northern Hemisphere, extended blocking occurs most frequently in the spring over the eastern Pacific and Atlantic Oceans.

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