高原与沙漠地区近地面湍流HAP模式研究  

Analysis of Near-Surface Turbulence in Plateau and Desert Regions Using HAP Model

作　　者：胡志远 邵士勇 汤沛 穆渊 吴晓庆 Hu Zhiyuan;Shao Shiyong;Tang Pei;Mu Yuan;Wu Xiaoqing(Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,Hefei Institute of Physical Science,Chinese Academy of Sciences,Anhui 230031,Hefei,China;Science Island Branch of Graduate School,University of Science and Technology of China,Anhui 230026,Hefei,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大气光学重点实验室,安徽合肥230031 [2]中国科学技术大学研究生院科学岛分院,安徽合肥230026

出　　处：《光学学报》2024年第24期105-113,共9页Acta Optica Sinica

基　　金：国家自然科学基金(42027804)。

摘　　要：本文旨在提高高原与沙漠地区激光大气传输湍流效应的评估精度。近地面是湍流变化最大且最剧烈的区域,对激光传输产生极大的影响。为了准确获取近地面湍流强度的高度分布,在高原与沙漠区域进行了地面两层高度(2 m和5 m)光学湍流的同步测量,以及无人机搭载温度脉动仪的空中测量。利用地面2 m处折射率结构常数实测值和当地日出日落时间,验证了HAP模式的适用性。进一步重新拟合了HAP模式的指数及其日变化,并提供了适合高原与沙漠地区的拟合公式。与传统模式相比,重新拟合的HAP模式在高原与沙漠地区激光大气传输湍流效应的评估中具有更好的适用性,为相关研究提供了新的参考依据。通过本研究,能够深化对不同下垫面大气光学湍流的分布差异的理解,提升不同地区激光大气传输湍流效应的评估精度。Objective We aim to enhance the accuracy of assessing turbulence effects on laser atmospheric transmission in plateau and desert regions.Deserts and plateaus serve as important application scenarios for laser atmospheric transmission.Due to their unique geographical and climatic conditions,these regions typically exhibit high transmittance,high wind speeds,and relatively low absorption coefficients.Consequently,the influence of atmospheric optical turbulence becomes the dominant factor,while atmospheric attenuation and thermal halo effects are generally minor.Indepth research on the height distribution of atmospheric optical turbulence in plateau and desert regions is crucial for improving the application of laser atmospheric transmission.Methods To capture the vertical distribution of turbulence intensity near the ground,we conduct simultaneous measurements of optical turbulence at two ground elevations(2 and 5 m)in plateau and desert regions,supplemented by aerial surveys using unmanned aerial vehicles equipped with microtemperature sensors.We first estimate the refractive index structure constant at a height of 5 m using the measured data at 2 m and local sunrise and sunset times,comparing the results with measured values.Furthermore,we extend the prediction of the refractive index structure constant to a range of 150 m near the ground using the HAP model,comparing these estimated values with profile data from unmanned aerial vehicles.We then refit the key parameter—exponential p—in the HAP model to optimize its predictive performance.Finally,we conduct a comprehensive evaluation of the newly fitted HAP model to ensure it provides more accurate and reliable turbulence intensity predictions in practical applications.Results and Discussions 1)The refractive index structure constants at both altitudes in plateau and desert regions exhibit significant“Mexican hat”diurnal variation characteristics(Fig.2).The structure constant is generally larger in plateau regions compared to desert regions,with slightly l

关 键 词：大气光学湍流 高原与沙漠地区 激光大气传输 近地面 HAP模式 

分 类 号：P427.1[天文地球—大气科学及气象学]