Occurrence and characteristics of sporadic K layer observed by lidar over Beijing, China

• 作 者: JIAO Jing YANG Guo Tao WANG Ji Hong WANG Ze Long YANG Yong
• 机 构: State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academ
• 出 处: Science China(Earth Sciences)
• 发表日期: 2016年03期
• 关键词: lidar sporadic China maxima seasonal sharp Figure successive altitude autumn

A double-laser-beam lidar was successfully developed in 2010 to measure the K layer over Yanqing County, Beijing(40.5°N, 116.2°E). Comprehensive statistical analyses of sporadic K(Ks) layer parameters were conducted using two years of lidar data, and the parameters of the Ks layers and their distribution obtained by the analyses are described. The seasonal distribution of Ks occurrence was obtained, with two maxima observed in January and July, respectively. The seasonal distributions of sporadic E(Es) occurrence over Beijing differ from those of Ks occurrence. However, good correlations between Es and Ks in case by case study were found. We also found that four Ks events with peak altitudes lower than 90 km were associated with large and sharp temperature increases in five comparative examples.

A double-laser-beam lidar successfully created in 2010 to measure the K layer over Yanqing County, Beijing (40.5 ° N, 116.2 ° E). ​​Comprehensive statistical analyzes of sporadic K (Ks) layer parameters were conducted using two years of lidar The seasonal distributions of Ks occurrence was, with two maxima observed in January and July, respectively. The seasonal distributions of sporadic E (Es) occurrence over Beijing differ from those of Ks occurrence. However, good correlations between Es and Ks in case by case study were found. We also found that Ks events with peak altitudes lower than 90 km were associated with large and sharp temperature increases in five comparative examples .