Lidar observations of sporadic Na layers over Wuhan (30.5°N, 114.4°E) -: art. no. 1345

被引:34
作者
Yi, F [1 ]
Zhang, SD [1 ]
Zeng, HJ [1 ]
He, YJ [1 ]
Yue, XC [1 ]
Liu, JB [1 ]
Lv, HF [1 ]
Xiong, DH [1 ]
机构
[1] Wuhan Univ, Dept Elect Engn, Wuhan 430072, Peoples R China
关键词
D O I
10.1029/2001GL014353
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
[1] Based on lidar measurements between March and September 2001, the characteristics of sporadic Na layers (Na-s layers) over Wuhan (30.5degreesN, 114.4degreesE) are presented. Na-s layers were observed on 29 occasions from 275 h observational data. They tended to show a seasonal variation with a maximum occurrence rate in July. The maximum Na density was 24080 cm(-3) which was comparable with those observed at low and high latitudes. Different from the observations at all other sites over the world, most Na-s layers over Wuhan tended to occur around the peak altitudes of the normal Na layers (similar to 92 km). However, a Na-s layer was observed at 112.9 km altitude. The formation of the Na-s layers over Wuhan generally needed a longer time than those at low and high latitudes. The formation processes usually consisted of consecutive density enhancement bursts. The Na-s layers often exhibited broader layer widths than those at low and high latitudes.
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页数:4
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