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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Characteristics of ripple structures revealed in OH airglow images
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Characteristics of ripple structures revealed in OH airglow images

机译：波纹结构显示的特点哦,大气光图片

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摘要

Small-scale ripple structures observed in OH airglow images are most likely induced by either dynamic instability due to large wind shear or convective instability due to superadiabatic lapse rate. Using the data set taken in the mesopause region with an OH all-sky imager at Yucca Ridge Field Station, Colorado (40.7°N, 104.9°W), from September 2003 to December 2005, we study the characteristics and seasonal variations of ripple structures. By analyzing the simultaneous background wind and temperature observed by the nearby sodium temperature/wind lidar at Fort Collins, Colorado (40.6°N, 105°W), and a nearby medium-frequency radar at Platteville, Colorado (40.2°N, 105.8°W), we are able to statistically study the possible relation between ripples and the background atmosphere conditions. Characteristics and seasonal variations of ripples are presented in detail in this study. The occurrence frequency of ripples exhibits clear seasonal variability, with peak in autumn. The occurrence of ripples shows a local time dependence, which is most likely associated with the solar tides. The lifetime and spatial scale of these ripples are typically 5–20 min and 5–10 km, respectively, and most of the ripples move preferentially either southward or northward. However, more than half of the observed ripples do not advect with background flow; they have higher Richardson numbers than those ripples that advect with background flow. It is possible that they are not instability features but wave structures that are hard to be distinguished from the real instability features.
机译：小规模的波纹结构中观察到的哦大气光图像是最有可能引起的由于大型风切变或动态不稳定由于超绝热对流不稳定递减率。哦,全天成像仪在中层顶区丝兰岭站,科罗拉多(40.7°N,104.9°W),从2003年9月到2005年12月,我们研究的特点和季节性的波纹结构的变化。同时背景风和温度观察到附近的温度/钠风科罗拉多州柯林斯堡的激光雷达(40.6°N, 105°W),和附近的中频雷达科罗拉多州Platteville(40.2°N, 105.8°W)能够统计研究可能存在的关系涟漪和背景之间的气氛条件。变化的涟漪中详细介绍本研究。表现出明显的季节性变化,峰值秋天。时间依赖性,这是最有可能的关联与太阳的潮汐。这些涟漪通常5 - 20分钟和规模分别为5 - 10公里,大部分的涟漪优先向南或移动向北。观察涟漪不会用平流输送与背景流;那些用平流输送与背景流的涟漪。他们不可能不稳定但波结构很难被特性区别真正的不稳定特性。

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