摘要
本文报道了“HEIFE”计划1991年4月和10月两次加强观测期在平川荒漠地区进行的直接太阳光谱的观测结果。通过对该地区太阳光学特性的分析得出:(1)波长λ=500nm处4月和10月晴天条件下平川荒漠地区大气光谱透明度平均为0.723。(2)(?)ngstr(?)m浑浊系数β和波长指数α之间有很好的负相关,用函数β=Ae_(Ba)拟合,其相关系数达0.872。(3)气溶胶的光学厚度不仅与地面气溶胶的粒子数有关,而且还依赖于气溶胶的谱分布、垂直廓线和粒子的物理化学成分。
In this paper, direct solar spectral measurements are reported during two intensive observing periods of the 'HEIFE' in Apr. and Oct. 1991 in desert range. By analysing data of the atmospheric optical properties, the results are as follows: (1) The average spectral transparency of atmosphere is 0.723 (for wavelength 500 nm) on clear or fine day. (2) The wavelength exponent a and the Angstrom turbidity coefficient β have an inverse relation. By using β=Aexp (Bα) to fit, the correlation coefficient is 0.872. (3) The aerosol optical thickness not only relates to aerosol concentration near the ground, but also depends on its size distribution, vertical profile, and chemical composition of the particles.
出处
《高原气象》
CSCD
北大核心
1992年第4期353-360,共8页
Plateau Meteorology
关键词
太阳光谱
大气
透明度
气溶胶
Solar spectrum
Atmospheric transparency
Aerosol
Turbidity.
