Characteristics of the Lyman-alpha humidiometer and measurements of turbulent humidity fluctuations over the ocean
✍ Scribed by Nobuhisa Yasuda; Tokiyoshi Toya
- Publisher
- Springer
- Year
- 1987
- Tongue
- English
- Weight
- 636 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0006-8314
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✦ Synopsis
The characteristics of a Lyman-alpha humidiometer have been carefully examined in an airconditioned test chamber. The results confirm that when carefully used, this humidiometer is suitable for measurements of turbulent humidity fluctuations. Measurements with a Lyman-alpha humidiometer were carried out in the surface boundary layer over the ocean. The relation between turbulent intensity (co = fl) and the friction humidity (a * ) can be expressed as u0 = 1.6a *. The spectrum of turbulent humidity for wind speeds larger than 3 m s -' conforms to the similarity law in the surface boundary layer. The spectrum has two characteristic normalized frequencies, namely, a higher peak and a secondary peak (or a shoulder).