关键词: 涡动相关法, CO2, 感热通量, 潜热通量, 辐射

Abstract:

The parameters such as sensible heat flux, latent heat flux, soil heat flux, radiation of long-and-short wavelength and the density of CO2 are separately measured with open-path eddy correlation system, HFP01 heat flux plate, the sensor of CNR1 net radiation and CO2/H2O analyzer(LI7500). Statics and analysis indicate that the largest value of net radiation at noon in clear days is up to 850 W/m2 during the period of observation in June, 2008, and 500 W/m2 in November. The reflectivity is 0.148 in summer, and 0.199 in winter. The latent heat flux and sensible heat flux are more or less the same in summer and winter, with the max value between 80 W/m2 and 220 W/m2. The energy equation is obviously lopsided, and the day-time rate of closure increasing with wind speed is basically between 0.4 and 1. The annual statics of the density of CO2 indicates that the diurnal variation characteristics of CO2 gas density are obvious during the four seasons, and the range of the density is between 640 W/m2 and 770 W/m2.

Key words: eddy correlation method, CO2, sensible heat flux, latent heat flux, radiation