Kolmogorov constants for CO2, wind velocity, air temperature, and humidity fluctuations over a crop surface

✍ Scribed by Shashi B. Verma; Dean E. Anderson

• Publisher: Springer
• Year: 1984
• Tongue: English
• Weight: 346 KB
• Volume: 28
• Category: Article
• ISSN: 0006-8314
• DOI: 10.1007/bf00119461

✦ Synopsis

The Kolmogorov constants for CO,, wind velocity, air temperature, and humidity fluctuations were evaluated from measurements made over soybean and grain sorghum fields and found to be 0.78 + O.I1,0.49 f 0.08,0.70 _+ 0.15, and 0.99 + 0.16, respectively. These results are consistent with recent observations reported in the literature. 1. Iotroduction Hicks and Dyer (1972) described a spectral density technique for determining turbulent fluxes. This technique utilizes known characteristics of the inertial subrange (see, e.g., Kaimal et al., 1972) and is particularly useful for measurements over the open ocean since it does not require explicit measurements of vertical velocity. Recently Large and Pond (1982) demonstrated the applicability of this approach in determining fluxes of sensible and latent heat from ships on the deep sea.

The flux computation technique mentioned above requires knowledge of the Kolmogorov constant for the fluctuating parameter with the appropriate spectral density value. The Kolmogorov constants for velocity and temperature fluctuations have been studied extensively. However, only a few studies have been reported on the Kolmogorov constant for humidity fluctuations. Except for one recent report (Ohtaki, 1982), the Kolmogorov constant for CO, fluctuations has not been evaluated.

There is considerable interest in determining CO, fluxes over the open ocean where the spectral density technique, using an appropriate value of the Kolmogorov constant, may be applied. In this paper, we present results of measurements of the Kolmogorov constants for CO,, wind velocity, air temperature, and humidity made over soybean and grain sorghum fields.