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近地面湍流对整层湍流的贡献及相关研究

Contribution of the Surface Layer to the Integral Turbulence in Northwest Plateau

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摘要

用由HTP-2型温度脉动仪和WXT520气象传感器组成的近地面参数测量系统以及大气相干长度仪的两年观测数据分析了西北高原地区近地面湍流。近地面参数测量系统分两层分别搭建在6 m 和2 m 高度上。温度脉动仪测量折射率结构常数,气象传感器测量常规气象参数,大气相干长度仪测量大气相干长度。分析结果表明:不同高度的折射率结构常数随高度按幂指数规律变化,白天幂指数平均值为-0.8,夜间为-0.3。用相干长度比评估近地面湍流层对整层湍流的贡献,结果表明:相干长度比有明显的日变化特征,白天小而夜间大;不同月份相干长度比日变化趋势和大小均不同。讨论了近地面局地视宁度与局地温差的关系,结果表明:局地视宁度和局地温差白天正相关,夜间负相关。

Abstract

Results from experiments measuring surface layer turbulence in Northwest China are presented. The measurements are taken over two years using surface layer atmospheric parameter system and differential image motion monitor.The surface layer atmospheric parameter system is composed of HTP-2 microthermal sensors and WXT520 meteorological sensorsis placed at 2 m and 6 m on a mast. Microthermal sensors are used to measure structure constant of refractive index and meteorological sensors are used to measure meteorological parameters. It is observed that structure constant of refractive index in the surface layer falls with exponent altitude dependence with the power index of -0.8 in the day and -0.3 at night. The contribution of surface layer to the integral turbulence is estimated using coherence length ratio. Coherence length ratio changes in a diurnal cycle with large values in the day and small values during the night and the changing trend and monthly averaged values are different between months. Discussion of relationship between local seeing and meteorological variables shows that local seeing correlates with temperature difference positively in the day while negatively during night. Based on longtime experiments, the results are credible and valuable in the work of site-testing and optimizing the performance of adaptive optical systems.

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中图分类号:P427.1

DOI:10.3788/aos201535.1101006

所属栏目:大气与海洋光学

基金项目:国家自然科学基金(41205023,41375017)

收稿日期:2015-06-10

修改稿日期:2015-06-10

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陈小威:中国科学院安徽光学精密机械研究所中国科学院大气成分与光学重点实验室, 安徽 合肥 230031中国科学技术大学研究生院科学岛分院, 安徽 合肥 230031
孙刚:中国科学院安徽光学精密机械研究所中国科学院大气成分与光学重点实验室, 安徽 合肥 230031
刘庆:中国科学院安徽光学精密机械研究所中国科学院大气成分与光学重点实验室, 安徽 合肥 230031
李学彬:中国科学院安徽光学精密机械研究所中国科学院大气成分与光学重点实验室, 安徽 合肥 230031
翁宁泉:中国科学院安徽光学精密机械研究所中国科学院大气成分与光学重点实验室, 安徽 合肥 230031中国科学技术大学环境科学与光电技术学院, 安徽 合肥 230026

联系人作者:陈小威(kachenxiaowei@126.com)

备注:陈小威(1990—),男,博士研究生,主要从事大气参数测量与分析方面的研究。

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引用该论文

Chen Xiaowei,Sun Gang,Liu Qing,Li Xuebin,Weng Ningquan. Contribution of the Surface Layer to the Integral Turbulence in Northwest Plateau[J]. Acta Optica Sinica, 2015, 35(11): 1101006

陈小威,孙刚,刘庆,李学彬,翁宁泉. 近地面湍流对整层湍流的贡献及相关研究[J]. 光学学报, 2015, 35(11): 1101006

被引情况

【1】陈小威,李学彬,刘庆,孙刚,张守川,朱文越,翁宁泉. 中国西部典型地区整层光学湍流观测与分析. 光学学报, 2016, 36(8): 801003--1

【2】刘思臻,任德清. 基于YAO软件的太阳地表层自适应光学系统的仿真. 激光与光电子学进展, 2017, 54(9): 90101--1

【3】王钰茹,梅海平,康丽,武鹏飞,崔朝龙. 湍流大气中折返路径激光成像探测实验. 中国激光, 2018, 45(4): 401008--1

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