利用Thorpe尺度估算南极点大气湍流廓线
ESTIMATING THE PROFILES OF ATMOSPHERIC TURBULENCE ABOVE THE SOUTH POLE BY THORPE SCALE

胡晓丹 ^1,2 吴晓庆 ¹ ^* 青春 ¹

文摘	分析了南极点(South Pole) 2012年常规气象参数探空数据,统计了南极点全年的边界层高度分布,利用Thorpe尺度估算了南极点夏季及冬季的折射率结构常数C_n~2 、大气相干长度、视宁度、等晕角等参数和边界层高度以上及边界层内的视宁度及其对整层(0—25 km)视宁度的贡献,将之与文献结果比对。结果表明:估算的C_n~2在近地面随高度迅速递减, 300 m后随高度缓慢减小, 5 km以后出现一个鼓包, 10 km后随高度稳定递减,都呈现湍流主要集中于300 m以下这一特点。用Thorpe尺度估算的南极点冬季整层视宁度为1.87'', 270 m以上高度视宁度为0.39'',与文献报道较为吻合。Thorpe尺度相较于其他外尺度模式估算过程更为简便。
其他语种文摘	Based on analysis of conventional meteorological parameters of sounding data above the South Pole in 2012, this study determined the boundary layer height above the South Pole throughout the entire year and used the Thorpe scale to estimate the refractive index structure constant profiles, atmospheric coherence length, seeing and isoplanatic angle. The seeing above and within the boundary layer and its integrated contribution to the entire layer (0-25 km) was compared with results in the literature. The comparison showed that the estimated profiles of C_n~2 decreased rapidly with height near the ground, decreased slowly above 300 m, presented a bulge after 5 km and decreased steadily after 10 km. Moreover, they were characterized by the fact that most of the turbulence was concentrated below 300 m. In winter above the South Pole, the Thorpe scale estimate of the average seeing and the seeing below 270 m was 1.87" and 0.39", respectively, consistent with the results of other studies. However, in comparison with other models, the estimates can be obtained more easily using the Thorpe scale.
来源	极地研究 ,2019,31(3):301-308 【扩展库】
DOI	10.13679/j.jdyj.20180058
关键词	大气光学 ; Thorpe尺度 ; 湍流廓线 ; 南极点 ; 视宁度
地址	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
语种	中文
文献类型	研究性论文
ISSN	1007-7073
学科	大气科学(气象学)
基金	国家自然科学基金
文献收藏号	CSCD:6563960