拉萨光学湍流探空测量与模式分析  

Optical Turbulence Measurement over Lhasa Using a Meteorological Radiosonde and Model Analysis

作　　者：韩亚娟 吴晓庆[1] 罗涛 苏昶东 青春 吴骕 杨期科 张坤 Han Yajuan;Wu Xiaoqing*;Luo Tao;Su Changdong;Qing Chun;Wu Su;Yang Qike;Zhang Kun(Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei,Anhui 230031,China;Science Island Branch of Graduate School,University of Science and Technology of China,Hefei,Anhui 230031,China)

机构地区：[1]中国科学院安徽光学精密机械研究所中国科学院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230031

出　　处：《光学学报》2020年第6期12-19,共8页Acta Optica Sinica

基　　金：中国科学院战略性先导科技专项(A类)(XDA17010104);国家自然科学基金(91752103,41576185);中国科学院科技创新重点实验室基金(CXJJ-19S028)。

摘　　要：利用自行研制的湍流气象探空仪,对西藏拉萨的温度、风速、风向等常规气象参数廓线和C2n廓线进行探测。分析了湍流强度和常规气象参数随高度的变化趋势。比较了夜晚和早晨的湍流特征,发现8~15km处两者均出现强湍流层,且8km以上早晨的湍流强度大于夜晚的湍流强度。同时基于Hufnagel-Vally 5/7模式,利用探空数据拟合得到符合拉萨湍流特征的拉萨C2n经验模式。对此经验模式进行统计分析,结果进一步证明拉萨C2n经验模式能有效估算拉萨的湍流强度。最后,将拉萨与高美谷的探空数据进行对比分析,发现拉萨的风速较小对天文观测有利,但湍流强度较强对天文观测有一定影响。该研究为后续拉萨湍流廓线和天文台选址的研究提供了参考,并为光电工程的应用提供了技术支持。This paper describes the use of a self-made meteorological radiosonde for turbulence analysis to measure profiles of the turbulence parameter C2n and meteorological parameters such as temperature,wind speed,and wind direction in Lhasa,Tibet.The trends of variation of turbulence intensity and meteorological parameters with height are analyzed.A comparison of the turbulence characteristics in the morning and evening reveals that a strong turbulence layer appears at 8--15km at both these durations,but the turbulence intensity above 8km in the morning is greater than that in the evening.Furthermore,based on the Hufnagel-Vally 5/7model,the C2n Lhasa model is fitted using the statistical average of all radiosonde data.The statistical analysis results show that the C2n Lhasa model can effectively estimate the turbulence intensity above Lhasa.Finally,a comparison of the radiosonde data of Lhasa and Gaomeigu reveals that the wind speed in Lhasa is lower and favorable for astronomical observations,but the turbulence in Lhasa is stronger and reduces the quality of astronomical observations.These results provide a foundation for the study of turbulence profiles,observatory site selection,and support for the application of electrooptical engineering in Lhasa.

关 键 词：大气光学 光学湍流 湍流廓线 探空测量 拉萨 

分 类 号：P412.23[天文地球—大气科学及气象学]