Observations of an atmospheric gravity wave by shear instability in katabatic wind at Mizuho Station, East Antarctica
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概要
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Measurements were made of vertical wind speed components, using two sonic anemothermometers on the snow surface at Mizuho Station in 1980 by the present authors who were members of the 21st Japanese Antarctic Research Expedition (JARE-21). The two anemothermometers were mounted at the fixed heights of 3m and 30m on a 30-m-high micrometeorological tower. The existence of shear instability (Kelvin-Helmholtz) waves with period of about 20s was revealed as a result. The maximum aplitude of the K-H waves was found when the surface layer had a local gradient Richardson number smaller than 0.25; the instability regime was in agreement with DRAZIN's criterion (J. Fluid. Mech., 4,214,1958). Such gravity waves were observed when a strong surface inversion was progressing above the snow surface after the katabatic wind had been disturbed by a synoptic scale disturbance.
- 国立極地研究所の論文
著者
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Kobayashi Shun'ichi
Institute Of Low Temperature Science Hokkaido University
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KAWAGUCHI Sadao
National Institute of Polar Research
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Ohata Tetsuo
Water Research Laboratory Faculty Of Science Nagoya University
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Ishikawa Nobuyoshi
The Institute of Low Temperature Science, Hokkaido University
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Ishikawa Nobuyoshi
The Institute Of Low Temperature Science Hokkaido University
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Ohata Tetsuo
Water Research Institute Nagoya University
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