用于激光雷达应用的随机定向六角形空心柱的反向散射特性.
Optics express
|October 20, 2023
概括
这项研究研究了使用空洞冰晶的圆云的光学特性. 新的模态空洞柱 (MHC) 有助于使用激光雷达数据区分空洞和固体冰晶的混合物.
科学领域:
- 大气光学是大气光学.
- 云物理 云物理
- 遥感是一种远程传感.
背景情况:
- 准确地解释太空和地面激光雷达数据取决于理解Cirrus云的光学特性.
- 当前的反向散射数据库缺少空洞冰晶柱的数据,这是一个常见的圆柱体组成部分.
研究的目的:
- 在激光雷达波长 (355,532,1064纳米) 上研究随机定向的空洞柱状冰晶的反散特性.
- 为中度圆云引入一种新的模式空洞柱 (MHC) 概念.
- 确定使用激光雷达衍生参数来区分空洞和固体冰晶混合物的方法.
主要方法:
- 使用物理光学 (PO) 近似计算的反向散射截面 (M11),脱极化比 (δ),激光雷达比 (S) 和颜色比 (χ).
- 模拟的随机定向的空洞柱子,尺寸从10到316.23微米.
- 引入并应用了模态空洞柱 (MHC) 概念.
主要成果:
- 对各种尺寸和波长的空洞柱子计算了光学特性 (M11, δ, S, χ).
- 该研究发现,可以识别出50%的MHC和固体柱 (SC) 混合物.
- 使用1064nm的激光雷达比率或 χ(1064,532) -δ(532) 关系,可以区分混合物.
结论:
- 模态空洞柱概念提供了一种简化但有效的方法,用于模拟中度半径中空洞冰晶.
- 利达尔比率和颜色去极化比率为区分混合相环状云提供了潜力.
- 这项研究改善了LIDAR数据解释,用于Cirrus云的表征.
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