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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Valley exit jet ： ウィキペディア英語版 Valley exit jet A valley exit jet is a strong, down-valley, elevated air current that emerges above the intersection of the valley and its adjacent plain. These winds frequently reach a maximum of 20m/s (45mph) at a height of 40-200m above the ground. Surface winds below the jet may sway vegetation but are significantly weaker. The presence of these strong nighttime down-valley air flows has been documented at the mouth of many Alpine valleys that merge with basins, such as the Inn Valley of Austria, where the jet is strong enough to be heard at the ground. In the United States, exit jet signatures have been observed at the North Fork Gunnison River at Paonia, Colorado, the exit of South Boulder Creek south of Boulder, Colorado and the mouth of Spanish Fork Canyon, Utah. ==Theory== Exit jets are likely to be found in valley regions that exhibit diurnal mountain wind systems, such as those of the dry mountain ranges of the US. These diurnal wind systems are driven by horizontal pressure gradients. Due to the abrupt transition over a short distance between the valley high pressure and the basin low pressure, the gradients are strongest near the valley exit, producing a jet. Other meteorological factors acting to increase exit wind speeds are the acceleration of winds originating inside the valley as they travel to lower elevations downvalley, and the process of cold valley air sinking and ejecting into the plain. Deep valleys that terminate abruptly at a plain are more impacted by these factors than are those that gradually become shallower as downvalley distance increases.〔Whiteman, C. David (2000). ''Mountain Meteorology'', p. 193. Oxford University Press, New York. ISBN 978-0-19-513271-7, pp. 191–193.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Valley exit jet」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.