我国海雾总体特点及其对中红外辐射能量衰减的分析

Features of China sea fog and its influence on intermediate infrared radiation energy attenuation

在对我国不同纬度海雾观测资料总结归纳的基础上,建立了我国海雾微物理结构的拟合分布模型,归纳了我国海雾的总体特点。标定了最常见海雾的尺度参数,并根据红外辐射在海雾中的散射与吸收特性,定量分析了不同海雾的消光系数,根据米氏散射定律定量计算了中红外波段下海面平流雾的散射衰减度,并据此与实验结果进行了比对,吻合性较好。根据米氏理论,在较浓平流雾条件下,雾滴为盐溶液时,中红外波段的消光系数均值为2.90,海雾消光系数随着尺度参数的增大呈现出单调减小的特点;而在纯水条件下,消光系数均值为3.35,消光系数随着尺度参数的增大而单调增加。

Based on the summary for the sea fogs of different areas of China sea, an overall distribution model about its micro-physics structure was put forward and its characteristics for China sea fog was summarized. The scale parameter was calibrated for most common sea fog, the extinction coefficient of different sea fogs were quantitatively analysed according to Mie theory, then, the attenuation coefficient was calculated in accordance with the formulars given by Mie and the final attenuation level was known. After a comparison, it witnessed a good agreement between theoretical calculation and experimental statistics. According to Mie theory, under the condition of salty fog drop, the average extinction coefficient of intermediate infrared radiation under common advection fog was 2.90, the extinction coefficient decreased monotonously along with the increase of scale parameter; while under the condition of pure water, the average extinction coefficient of intermediate infrared radiation was 3.35, the extinction coefficient increased monotonously along with the increase of scale parameter.