Fang Xin, Li Tao, Ban Chao, Wu Zhaopeng, Li Jing, Li Feng, Cen Yetao, Tian Baogang
Opt Express. 2019 Feb 18;27(4):4126-4139. doi: 10.1364/OE.27.004126.
We developed a mobile ozone differential absorption lidar system to simultaneously measure the vertical profiles of tropospheric and stratospheric ozone from an altitude of 5 to 50 km. The system emits four laser beams at wavelength of 289 nm, 299 nm, 308 nm and 355 nm and receives their corresponding Mie/Rayleigh backscattering return signals, and two N Raman return signals at 332 nm and 387 nm shifted from 308 nm and 355 nm, respectively. An assembled telescope array with four 1.25-m telescopes (effective diameter > 2 m) collects the Rayleigh and Raman backscattering signals at 308/332 and 355/387 nm. This system is currently deployed at the Yangbajing Observatory in Tibet (4300 m elevation) and has begun observations in regular campaign mode since October 2017. The lidar results agree very well with those observed by the Aura/MLS satellite. This novel ozone lidar system operates at the highest elevation of any such system in the world. The higher elevation and larger receiver aperture of this system yield a higher signal-to-noise ratio and lower statistical uncertainty.
我们开发了一种移动式臭氧差分吸收激光雷达系统，用于同时测量对流层和平流层臭氧在约5至50千米高度范围内的垂直廓线。该系统发射波长为289纳米、299纳米、308纳米和355纳米的四束激光，并接收其相应的米氏/瑞利后向散射回波信号，以及分别从308纳米和355纳米偏移得到的332纳米和387纳米处的两个氮拉曼回波信号。一个由四台1.25米望远镜（有效直径>2米）组成的望远镜阵列收集308/332纳米和355/387纳米处的瑞利和拉曼后向散射信号。该系统目前部署在西藏羊八井天文台（海拔约4300米），自2017年10月起已开始以常规观测模式进行观测。激光雷达测量结果与Aura/MLS卫星观测结果非常吻合。这种新型臭氧激光雷达系统在世界上同类系统中运行海拔最高。该系统较高的海拔和较大的接收器孔径带来了更高的信噪比和更低的统计不确定性。
