Diurnal cycle of temperature and wind fluctuations within an African equatorial rain forest

Autor:	C. Bouka Biona, Roberto Fernando da Fonseca Lyra, Aimé Druilhet, Bruno Benech
Rok vydání:	2001
Předmět:	Atmospheric Science Global and Planetary Change Tree canopy Turbulence Diurnal temperature variation Forestry Sunset Wind speed Diurnal cycle Climatology Turbulence kinetic energy Sunrise Environmental science Agronomy and Crop Science
Zdroj:	Agricultural and Forest Meteorology. 109:135-141
ISSN:	0168-1923
Popis:	This paper describes the characteristics of the temperature and wind speed fluctuations measurements inside the north Congo forest during the DECAFE experiment in February 1988. The temperature spectra show a maximum at 0.018 Hz with a slope close to − 2 3 and the scattering increases as the frequency decreases while the nS(n) wind speed spectra has a maximum at 0.02 Hz with a negative slope at higher frequencies. The dynamical or thermal turbulence in the canopy layer is characterized by a maximum variance in the middle of the day and by two singularities during the transition time at sunrise and sunset when variances are small. This behavior could be due to the turbulent kinetic energy which increases turbulence in the upper part of the canopy layer and also to strongly anisotropic motions generated by the non-homogeneity of the temperature and wind fields inside the forest.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bf12b96a3864201dfab865221c0bfb8f https://doi.org/10.1016/s0168-1923(01)00253-2 Zobrazit plný text záznamu Full Text from ScienceDirect