Spectrum of the Wind

Japanese: 風のスペクトル - かぜのすぺくとる
Spectrum of the Wind

...In mid-latitudes, there is a tendency for winds to be strong in the lower layers during the day and weak at night, and for winds to be strong at night and weak during the day in the upper layers, with the boundary between these two being around 100 m (Figure 7).
[Wind spectrum]
If we consider wind to be made up of vortices of various sizes, we can understand the nature of wind speed fluctuations by analyzing its spectrum. Figure 8 shows the spectrum of wind speed fluctuations analyzed by Van der Hoven.

*Some of the terminology that refers to the "wind spectrum" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…中緯度においては,下層は日中の風が強くて夜間は弱い,上層は夜間の風が強くて日中弱いという傾向がみられ,その境界はだいたい100m前後である(図7)。
[風のスペクトル]
 風はいろいろの大きさの渦から成り立っていると考えるとそのスペクトル解析をすることで風速変動の性質がわかる。図8はファン・デル・ホーベンVan der Hovenによって解析された風速変動のスペクトルである。…

※「風のスペクトル」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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