AN INVESTIGATION OF ANTICYCLOGENESIS IN ALASKA

摘要: Abstract It is found that the Alaska-northwestern Canada region one of most frequent anticyclogenesis (equal to or greater than 7 mb/24 hr) on northern hemisphere north 40°N. Results are presented a synoptic investigation predominant type in Alaska. Certain features, common five cases investigated, noted and then depicted model anticyclogenesis. These features indicate that: (1) Strong warm-air advection occurs, prior during period anticyclogenesis, low middle troposphere west locale A ridge aloft associated with this advection. Ascending motions occur lower stratosphere strong advection, result appearance cold air (200 mb). (2) In subsequent Alaska, there pre-existing isolated air, trough temperature, p...