Simultaneous and common-volume lidar observations of K/Na layers and temperature at Arecibo Observatory (18 degrees N, 67 degrees W)
Simultaneous and common-volume lidar observations of K/Na layers and temperature at Arecibo Observatory (18 degrees N, 67 degrees W)
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在阿雷西博天文台（北纬 18 度，西经 67 度）对 K/Na 层和温度进行同步和共体积激光雷达观测
DOI：
10.1002/2015jd024494
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发表时间：
2016
影响因子：
4.4
通讯作者：
Tepley Craig
中科院分区：
文献类型：
--
作者：
Yue Xianchang;Zhou Qihou;Yi Fan;Friedman Jonathan;Raizada Shikha;Tepley Craig
我们介绍了2003年12月和2004年1月在波多黎各的阿雷西博天文台（18.35°N，66.75°W）由K多普勒激光雷达和Na激光雷达进行的第一次中间层K、Na和温度的同时和共体积观测。Na和K层的行为和温度变化表明，Na和K层的底部边缘几乎完全匹配。随着温度的升高和降低，Na层的峰密度和柱密度都有较大幅度的增加和减小，而K层的峰密度和柱密度则不一样。温度和密度波动之间的相关性在夜间平均密度分布的峰值高度和略低于峰值高度处是强正的，并且在Na或K的相应峰值上方几公里处过渡到负相关。在低海拔地区发生的零星Na和K层并没有表现出相同的方式，特别是当背景温度降低。讨论了动力学效应和化学效应对Na层和K层行为的影响。我们的分析表明，波诱导的动力学输运可以解释所观察到的温度，钠密度和K密度波动之间的相关性。动力学输运和波致化学输运对Na层和K层的行为有相似的影响。Na和K层之间的不同行为可以在很大程度上归因于Na和K化学的不同温度依赖性。
We present the first simultaneous and common-volume observations of mesospheric K, Na, and temperature conducted by a K Doppler lidar and a Na lidar at the Arecibo Observatory (18.35°N, 66.75°W), Puerto Rico in December 2003 and January 2004. The behaviors of the Na and K layer and the temperature variations showed that the bottom edges of the Na and K layers matched almost exactly with each other. The peak and column densities increased/decreased largely with the increase/decrease of temperature for the Na layer; but it was not the same for the K layer. The correlation between temperature and density fluctuations was strongly positive at and just below the peak altitude of the nightly mean density profile and transitioned to negative several kilometers above the respective peak of either Na or K. Sporadic Na and K layers occurring at low altitudes did not behave in the same manner especially when the background temperature decreased. We discuss the impact of dynamical effects and chemical effects on the behaviors of Na and K layers. Our analysis suggests that the wave-induced dynamical transport can account for the observed correlations among temperature, Na density and K density fluctuations. Dynamical transport and the wave induced chemical transport have similar effect on the behaviors of Na and K layer. The different behaviors between Na and K layers can largely be ascribed to the different temperature dependency of Na and K chemistries.