合肥地区CO_2含量和湍流通量的测量研究

Study on the Density of CO_2 and Turbulence Flux in Hefei

利用开路涡旋相关系统、HFP01热通量板、CNR1净辐射计传感器和CO_2/H_2O分析仪(LI7500)分别测量了合肥地区感热通量、潜热通量、土壤热通量、长短波辐射和CO_2浓度等参数。统计分析表明:08年夏季6月份观测期间晴天中午净辐射最大可达650 W/m^2,冬季11月最大为500 W/m^2;地表反射率夏季为0.148,冬季为0.199;夏季和冬季潜热通量和感热通量相当,最大值在80～220 W/m^2之间;地表能量方程出现明显的不平衡现象,白天闭合率基本在0.4～1之间,且随摩擦风速的增大而增大;碳含量的年度统计表明:CO_2浓度四季都有明显的日变化特征,变化范围在640～780 mg/m3之间。

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（LIT500）. Statics and analysis indicate that the largest value of net radiation at noon in clear days is up to 850 W/m^2 during the period of observation in June, 2008, and 500 W/m^2 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/m^2 and 220 W/m^2. The energy equation is obviously lopsided, and the day-time rate 6f 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/m^2 and 770 W/m^2