Aircraft measurements of wave momentum flux over the Colorado Rocky Mountains
Aircraft measurements of wave momentum flux over the Colorado Rocky Mountains
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科罗拉多落基山脉上空波浪动量通量的飞机测量
DOI：
10.1002/qj.49710845709
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发表时间：
1982
影响因子：
8.9
通讯作者：
R. Chervin
中科院分区：
文献类型：
--
作者：
Douglas K. Lilly;J. M. Nicholls;Patrick J. Kennedy;J. Klemp;R. Chervin
结果来自一个旨在测量与北美落基山脉中部上空重力驻波相关的动量通量的程序。目的是确定西风带穿过北半球山区时的动量损失，据信那里的波浪阻力很大。来自一到三架仪表飞机的数据，运行了 20 个飞行日，大部分是在 1973 年 1 月到 3 月期间，与线性波理论相当吻合，也与下坡风的表面测量值有很好的相关性。向下西风动量通量平均为 0.5 - 1.0 达因 cm−2 (0.05 - 0.1 Pa)。飞行日的平均西风流量接近项目期间的气候平均值，尽管整个期间的平均流量比气候平均值弱得多。
Results are presented from a programme designed to measure the momentum flux associated with standing gravity waves over the central Rocky Mountains of North America. The purpose was to determine momentum losses from the westerlies as they cross a mountainous section of the northern hemisphere where wave drag is believed to be substantial. The data from one to three instrumented aircraft, operating on 20 flight days, mostly during January to March of 1973, are in reasonably good conformity with linear wave theory and also correlate well with surface measurements of downslope winds. Downward westerly momentum flux averaged 0.5 - 1.0 dynes cm−2 (0.05 - 0.1 Pa). The mean westerly flow on the flight days was near the climatological mean for the period of the project, although the mean flow over this period as a whole was much weaker than the climatological mean.