南海海边整层大气相干长度的测量与分析  

Measurement and analysis of whole layer atmospheric coherence length at seaside of South China Sea

作　　者：于龙昆[1] 吴毅[1] 侯再红[1] 靖旭[1] 何枫[1] 秦来安[1] 程知[1] 

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成分与光学重点实验室,安徽合肥230031

出　　处：《红外与激光工程》2012年第11期3046-3049,共4页Infrared and Laser Engineering

基　　金：国家863计划

摘　　要：大气相干长度是描述光波大气传输中湍流效应的重要参量,具有区域变化特性。海边大气相干长度的测量结果很少有报道,利用差分像运动法大气相干长度仪观测了茂名博贺海边的整层大气相干长度,获得了海边大气相干长度的全天数据。数据分析表明,海边整层大气相干长度日变化明显,夜晚起伏无规则,上半夜平均天文视宁度好于下半夜,白天最差;与陆地数据比较得知,海边整层大气相干长度日变化不如陆地上的剧烈,海边日变化成近"V"型,陆地上的为近"U"型;通过分析比较,提出了一些启发性的见解。Atmospheric coherence length, which is a fundamental parameter describing turbulence effect of light propagation in atmosphere, changes in different region. It was rarely reported about measurement of atmospheric coherence length at seaside; whole layer atmospheric coherence length at seaside of Bohe, Maoming was measured by using atmospheric coherence length measurer based on differential image motion principle, and all-day data of whole layer atmospheric coherence at seaside was obtained. Analysis of data shows that whole layer atmospheric coherence length at seaside has an obvious diurnal variation and changes irregularly at night, and that the average astronomical seeing at seaside from nightfall to midnight is good than that from midnight to morning and is worst in daytime. Compared with data in land, diurnal variation of whole layer atmospheric coherence length at seaside is not so sharp as in land. Diurnal variation at seaside is near ＂V＂ type where in land is near ＂U＂ type. By analysis and comparison, some enlightening views were proposed.

关 键 词：大气相干长度 光学湍流 日变化 

分 类 号：P412[天文地球—大气科学及气象学]