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Gravity wave characteristics observed by lidar and radiosonde in Wuhan

Lü Hong-Fang~(1,2),YI Fan~11 School of Electronic Information,Wuhan University,Wuhan 430079,China2 School of Physics & Information Engineering,Jianghan University,Wuhan 430056,China  
Based on the Rayleigh echo signal data(30~65 km) from Wuhan University Fe-resonance fluorescence Lidar December 2003 to March 2005,we study the statistical characteristics of gravity waves over Wuhan(30.5°N,114.4°E).Data analysis of atmospheric density perturbations shows that the most vertical wavelengths are around 3~4 km and 17~20 km.The monthly mean intensity of gravity waves has a maximum in winter and a minimum in summer.Comparing with the corresponding gravity wave characteristics obtained by radiosonde detections in Wuhan 2004, it is found that the seasonal variation of gravity wave intensity in troposphere and low stratosphere shows a similar behavior with that in high stratosphere and low mesosphere.This behavior is consistent with the seasonal variation of the tropospheric jet stream intensity and maximum wind shear over Wuhan.
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