激光雷达探测青藏高原气溶胶吸湿增长  

Detection of aerosol hygroscopic growth in Tibetan Plateau by LiDAR

作　　者：张博文 范广强 张天舒 项衍 ZHANG Bo-wen;FAN Guang-qiang;ZHANG Tian-shu;XIANG Yan(Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;Information Materials and Intelligent Sensing Laboratory of Anhui Province,Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China)

机构地区：[1]中国科学院合肥物质科学研究院安徽光学精密机械研究所,安徽合肥230031 [2]中国科学技术大学,安徽合肥230026 [3]安徽大学物质科学与信息技术研究院,安徽省信息材料与智能传感实验室,安徽合肥230601

出　　处：《激光与红外》2025年第2期215-225,共11页Laser & Infrared

基　　金：第二次青藏高原科学考察研究计划项目(STEP)(No.2019QZKK0605;No.2019QZKK0105);国家重点研发计划项目(No.2022YFC3700400;No.2022YFC3704000);国家自然科学基金项目(No.42005106;No.41941011);山西省重点研发项目(No.202202150401009);民用航空技术预研项目(No.D020305)资助。

摘　　要：本研究使用多波长Mie-Raman激光雷达收集相对湿度和气溶胶光学参数等数据,研究吸湿增长对气溶胶颗粒光学和微物理特性的影响。选取青藏高原林芝机场观测的两个典型案例,在二维分析层面进行深入分析。无论Case1还是Case2,激光雷达探测数据都表明,吸湿增长因子首先表现出快速上升的趋势,然后随着相对湿度的增加而缓慢增长。为了提高分析的准确性,对几种模型进行了拟合和比较。结果表明,本文提出的三参数模型具有最高的相关系数,证明了其有效性和准确性。此外,通过将观测数据与浊度计进行对比,进一步验证了多波长Mie-Raman激光雷达在识别气溶胶吸湿增长特性的可靠性。结果表明,在不同高度观测气溶胶的吸湿增长因子后,气溶胶颗粒的吸湿性、沉降性和吸收饱和度有明显的增强趋势。这一发现增加了对气溶胶性质的重要理解,并为青藏高原大气环境变化的研究提供了重要的经验支持。In this study,a multi-wavelength Mie-Raman LiDAR is used to gather relative humidity and aerosol optical parameter data to investigate the effects of hygroscopic growth on the optical and microphysical characteristics of aerosol particles.Two typical cases observed at Nyingchi airport on the Tibetan Plateau are chosen for in-depth examination at the two-dimensional analysis level.Regardless of Case 1 or Case 2,the LiDAR data demonstrates that the hygroscopic growth factor firstly exhibits a fast-rising trend,and then grows slowly with the increase of relative humidity.In order to improve the accuracy of the analysis,several models are fitted and compared.The outcomes demonstrates that the three-parameter model proposed in this paper has the highest correlation coefficient,proving its validity and accuracy.Furthermore,the dependability of multi-wavelength Mie-Raman LiDAR in identifying aerosol hygroscopic growth is further validated by contrasting the observational data with nephelometers.The results show that the hygroscopicity,sedimentation,and absorption saturation of aerosol particles have a significant enhancement trend after examining the hygroscopic growth fac-tors of aerosols at various heights.This finding adds significant understanding of aerosol properties and offers important empirical support for research on changes in the atmospheric environment in the Tibetan Plateau.

关 键 词：拉曼激光雷达 气溶胶探测 吸湿增长 光学特性 

分 类 号：P407.5[天文地球—大气科学及气象学]