Clouds in the Vicinity of the Stratopause Observed with Lidars at Midlatitudes (40.5-41°N) in China
Clouds in the Vicinity of the Stratopause Observed with Lidars at Midlatitudes (40.5-41°N) in China
复制标题
DOI：
10.1002/essoar.10509565.1
复制
发表时间：
2021-12
期刊：
影响因子：
--
通讯作者：
Shaohua Gong;Yuru Wang;Jianchun Guo;Weipeng Chen;Yuhao Zhang;Faquan Li;Yuchang Xun;Jiyao Xu;Xuewu Cheng;Guotao Yang
中科院分区：
文献类型：
--
作者：
Shaohua Gong;Yuru Wang;Jianchun Guo;Weipeng Chen;Yuhao Zhang;Faquan Li;Yuchang Xun;Jiyao Xu;Xuewu Cheng;Guotao Yang
基于延庆（40.5°N，116°E）和平泉（41°N，118.7°E）激光雷达（光探测和测距）的长期观测，首次报告了北京上空平流层顶附近发生的云事件。这些事件发生在海拔 33~65 km 范围内，层层稀薄稀疏，VBSC 最大值范围为 1×10−10m−1sr−1 至 5.5×10−9m−1sr−1。考虑到 SABRE/TIMED 的温度和水蒸气测量，研究了这些激光雷达观测到的云事件的发生机制。研究发现，一些云层是由于中层大气局部气象变化导致水蒸气成核而形成的，而其他激光雷达观测到的云可能包括漂浮的宇宙尘埃、水合物液滴、火山灰、太空交通尾气等云团。这些云事件是我国中纬度地区激光雷达观测到的中层大气中罕见的类云现象；它们在高度分布和季节变化方面与 NLC 和 PSC 不同，其发生背后的相关微物理过程可能对中纬度地区的气象学有意义。
Based on long-term lidar (light detection and ranging) observations at Yanqing (40.5°N, 116°E) and Pingquan (41°N, 118.7°E), cloud events occurred in the vicinity of the stratopause above Beijing were reported for the first time. These events occurred with tenuous and sparse layers within the altitude range of 33–65 km, and the maximum VBSC value ranged from 1×10−10m−1sr−1 to 5.5×10−9m−1sr−1. Considering temperature and water vapor measurements from SABER/TIMED, the occurrence mechanism of these lidar-observed cloud events was examined. It was found that some cloud layers resulted from the nucleation of water vapor due to the local meteorological changes in the middle atmosphere, while other lidar-observed clouds could comprise floating clusters of cosmic dust, hydrate droplets, volcanic ash, space traffic exhaust, etc. These cloud events are rare cloud-like phenomena in the middle atmosphere observed by lidars at midlatitudes in China; they differ from NLCs and PSCs in terms of altitude distribution and seasonal variation, and the relevant microphysics processes behind their occurrence are likely meaningful to meteorology at midlatitudes.