320m气象塔太阳辐射梯度观测

OBSERVATION OF RADIATION GRADS BY 320-Meter METEOROLOGICAL TOWER IN BEIJING

该文介绍了利用北京 32 0m气象塔进行太阳辐射梯度测量的仪器装置和初步观测结果。实验表明 ,自行设计制造的太阳辐射自动观测系统 (包括自动太阳跟踪器和数据采集系统 )运行可靠 ,可满足观测要求。初步实验观测结果表明 ,地面与 32 0m高度之间的辐射衰减明显 ,在极晴好天气下太阳直接辐射在中午时段相差仅 10W/m2 左右 ,而在近地面污染严重的条件下其相对差值最大可达 14 0W/m2 左右。在晴好天气下总紫外辐射高空与地面相对差值很小 ;在大气能见度差时总紫外辐射值减少 ,但是高空与地面的差值相对加大。

The instruments of 320 m meteorological tower were used to observe radiation gradient in Beijing. Experimental results indicate that the automatic monitoring radiation system, which includes the automatic sun tracker system and the data collection system, works well and fulfill the observation standard. The results show that the decrease of radiation from the height of 320 meters to the ground is evident, the difference value is only 30 W/m2 in fine weather and 140 W/m2 while there is heavy pollution near the ground, respectively. The total UV radiation difference value between high altitude and ground in fine weather is smaller than that in bad weather.