Investigation of tidal wave activities over Wuhan by daytime sodium lidar

Abstract

Abstract:

The first daytime sodium lidar observations in China were made at Wuhan (30.5°N, 114.6°E). In a long observation cycle lasting more than two days, the sodium layer presented large diurnal variations. The sodium column density, layer width and centroid height, all presented 24 hour periodic variations. The density variation at each height also presents a clear 24 hour downward wave phase propagation. All these can be attributed to a prominent diurnal tidal wave perturbation, and the derived phase agrees very well with that obtained from the GSWM00 model. A large sodium diurnal variation was also present in three other shorter daytime observations, while the mean diurnal variations of the sodium layer present a prominent structure of diurnal tidal wave propagation. These results agree with those reported by Xiong et al. (2004), namely, that the diurnal tide component is the dominant tide over Wuhan.

Key words: lidar, daytime observation, sodium diurnal variations, tidal wave

LU Honghui,YANG Guotao, WANG Jihong,CHENG Xuewu,GONG Shunsheng, LI Faquan, YANG Yong, LIU Zhengkuan . Investigation of tidal wave activities over Wuhan by daytime sodium lidar[J]. J4, 2013, 30(1): 17-24.

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