Turbulent characteristics and bulk transfer coefficients over the desert in the HEIFE area |
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| Authors: | Ichiro Tamagawa |
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| Institution: | (1) Institute for Hydrospheric-Atmospheric Sciences, Nagoya University, Furo-cho Chikusa-ku Nagoya, Japan |
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| Abstract: | Observations of surface-layer turbulence and turbulent fluxes were made over a desert in northwestern China as a part of HEIFE (HEIhe river Field Experiment). These show that the normalized variations of the vertical wind component and of the air temperature obey Monin-Obukhov similarity well, especially in free convective conditions. However, the variations of specific humidity do not obey Monin-Obukhov similarity.Mean bulk transfer coefficients of sensible heat and momentum flux are obtained as functions of stability over a wide stability range from the observed data of turbulent fluxes and mast profiles. However, the bulk transfer coefficient for water vapor could not be obtained because of the large scatter of the data. In free convective conditions, the sensible heat flux was found to be approximately proportional to the 1.4 power of temperature difference between the surface and 20m. The bulk transfer coefficient of sensible heat is also obtained as a function of the bulk Richardson number for practical convenience. |
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| Keywords: | Turbulence Water vapor Turbulent flux Bulk Coefficient HEIFE Desert Similarity |
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