Austral summer foehn winds over the McMurdo dry valleys of Antarctica from Polar WRF
Austral summer foehn winds over the McMurdo dry valleys of Antarctica from Polar WRF
复制标题
来自极地 WRF 的南方夏季焚风吹过南极洲麦克默多干燥山谷
DOI：
10.1002/qj.2278
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发表时间：
2014
影响因子：
8.9
通讯作者：
A. Monaghan
中科院分区：
文献类型：
--
作者：
D. Steinhoff;D. Bromwich;Johanna C. Speirs;H. McGowan;A. Monaghan
Foehn winds are a prominent feature of the McMurdo Dry Valleys (MDVs) climate, and are responsible for periods of strong winds and warming. The foehn mechanism determined from a case study presented in earlier work is shown here to be robust for a set of the MDVs summer foehn events over the 1994–2009 period using output from the Polar Weather Research and Forecasting Model (Polar WRF). Gap flow south of the MDVs is evidenced by the positive relationship between the pressure gradient and near‐surface wind speed along the gap. Subsequently, mountain waves are generated and result in adiabatic warming and the downward transport of warm air into the MDVs, and differences in mountain wave characteristics depend on the ambient wind direction and the degree of flow nonlinearity. Pressure‐driven channelling then brings warm foehn air downvalley.
