辽东湾海冰反射特性

海冰反照率是研究海冰表面特性、海冰分布、海冰厚度和极地气候的重要光学量之一。将卫星于不同位置所测量到的海冰双向反射率准确地转化为相应的反照率的值，对于获得大规模海冰的时空特性是非常重要的。研究了辽东湾海冰反照率与海冰双向反射分布函数之间的相关关系。结果表明：(1)反照率与海冰组分密切相关，海冰表层颗粒物浓度越高，反照率α(λ)的值越小，气泡的含量越高，α(λ)越大;(2)当仪器探头天顶角θ为0°时，所测量的双向反射因子R_f与反照率α(λ)的值是相似的;随着θ的增大，R_f的值逐渐增大，且与探头方位角的相关性逐渐增强;当θ的值等于太阳天顶角63°时，R_f的值最大，且与探头方位角的相关性最强;(3)不同类型的冰具有不同的各向异性反射因子。

Reflectance of Sea Ice in Liaodong Bay

In the present study, the relationships between sea ice albedo and the bidirectional reflectance distribution in Liaodong Bay were investigated. The results indicate that: (1)sea ice albedo α(λ) is closely related to the components of sea ice, the higher the particulate concentration in sea ice surface is, the lower the sea ice albedo α(λ) is. On the contrary, the higher the bubble concentration in sea ice is, the higher sea ice albedo α(λ) is. (2)Sea ice albedo α(λ) is similar to the bidirectional reflectance factor R_f when the probe locates at nadir. The R_f would increase with the increase in detector zenith θ, and the correlation between R_f and the detector azimuth would gradually increase. When the θ is located at solar zenith 63°, the R_f would reach the maximum, and the strongest correlation is also shown between the R_f and the detector azimuth. (3)Different types of sea ice would have the different anisotropic reflectance factors.