冰云对天空偏振模式的影响  

Atmospheric Polarization Properties under Ice Cloud Conditions

作　　者：崔岩[1] 李得先 周野 陈宇茜 尚子一 CUI Yan;LI Dexian;ZHOU Ye;CHEN Yuqian;SHANG Ziyi(State Key Laboratory of High-performance Precision Manufacturing,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学高性能精密制造全国重点实验室,大连116024

出　　处：《光子学报》2023年第11期311-322,共12页Acta Photonica Sinica

基　　金：国家自然科学基金(No.51675076)。

摘　　要：不同冰云条件对以偏振模式为导航信息源的偏振导航影响较大,为探究冰云大气相关参数(冰晶粒子形状、有效半径、冰水含量以及光学厚度等)对天空偏振模式的影响,建立了基于蒙特卡罗法的矢量传输模型,利用libRadtran模拟了实际冰云大气辐射传输过程,分析了不同冰云大气相关参数对天空偏振模式的影响,并通过图像式测试系统,实地测试了大连地区10组实际大气条件下天空偏振模式随冰云大气相关参数的变化情况。结果表明:冰晶粒子形状对冰云大气偏振度影响较大,对冰云大气偏振方位角影响较小。并且冰云大气偏振度随有效半径的增大而增大,随光学厚度和冰水含量的增大而减小,后逐渐趋于稳定的状态。在不同日期同一时刻下,大连地区实际冰云大气偏振度变化规律与仿真基本一致,验证了本文方法的有效性,为偏振导航的在实际冰云大气条件下的工程应用提供了理论支撑。Many animals have the strange ability to sense the polarized light and navigate using the stable polarization mode in the sky,and the polarization navigation technology has been studied by mimicking the biological polarization navigation mechanism.As the information source of polarization navigation,the sky polarization mode lacks systematic research in the atmosphere of the ice cloud,which hinders the practical application of polarization navigation technology.To explore the influence of ice cloud atmospheric related parameters,such as ice crystal particle shape,effective radius,ice water content and optical thickness,on the sky polarization pattern.A vector transport model based on the Monte Carlo method,by the radiative transfer process of actual ice clouds.This paper analyzed the change law of atmospheric polarization mode of the ice cloud with different shapes with different observation height angles,the change law of atmospheric polarization of the ice cloud with different effective radii under different ice water content,the change law of atmospheric polarization of ice cloud with thickness and neutralization optical thickness under different ice water content.And through the image-type test system,the variation of sky polarization pattern with effective radius,optical thickness and ice water content in 10 sets of actual atmospheric conditions in Dalian University of Technology were tested.The results shown that the shape of ice crystal particles affects the polarization of the ice cloud and the azimuthal polarization of the ice cloud.The plate polymer particle polarization was greater than plate particles.Because the plate particles,plate polymer particles usually had larger size distribution and more complex shape,which made the light into the particle multiple scattering,reflection and refraction and larger phase difference,leading to a stronger polarization effect,and produced larger polarization.Solid column/bullet particles were larger than hollow column/bullet particles.Because the solid column/soli

关 键 词：大气光学 偏振模式 libRadtran 冰云 大气散射 

分 类 号：P427.1[天文地球—大气科学及气象学]