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期刊论文

MF rodar observation of mean wind and tides of winter mesopause (20-98km) region over Wuhan (30

易帆Shao Dong Zhang ab* Fan Yia Xiong Huc

Journal of Atmospheric and Solar-Terrestrial Physics 66 (2004) 15-25,-0001,():

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摘要/描述

Data obtatmed from the medlun-frequency radar at Wuhan (30°N, 114°E} from Ⅱ to 25 February and frum 28 February to 13 March have been used to study the mean wind and tidal ogcillations at mesopause (8O-98km) region over Wuhan to 13 Minter The observed zonal and meridional mean winds show obvious temporal variation and usually decrease widl the mcreasing heighls in most observational time. the zonal mean wind is eastward A Aynamic spectral analysis of disturbance amplutudc illustratcs a promincnt peak at a period of 24h al all hcighls and alines! uninterrupted, and there are occasionally shghlly stong senlldiurnal and weak lerdiurnal tidal disturbarces, indicating that in Ihe mid-lalitude regions. the diurnal tide is Ihe dominant tidal disturbance at tnesopausc in winter. The temporal variation of tidal ampbtudes and their wave kinematical cncrgies iffustrates that there may bc sigmificant resonant interaction among the diurnal, semidiurnal and terdiurnal rides A quantitative compariosn with Ihe global-scale wave model (GSWM) demonslrates that the observed diuulal and semidiurnal tidal amplitudes are less 3nd larger than lhe results of GSWM-02. respectively Tbe essentially linear GSWM carmot predicl Ihe decrease ot diurnal tidal anplitude at higher heigbts. which muy be due to several possible nonlinear processes. such at wave-Wave interaction aad wave break. Although the height vanations of tidal phases are Consistenly well with the prediction of GSWM. there are evident pbase differenees between our observation and tile model. The profiles of the diunanl tidal phases show nbvious decreasc trond with Ihe increasiong height, indicalmg the observed diurnal tide is propagating upward The vertical wavelength of Ihe observed diurnal tide is estimated to be about 37km. and die eorresponding downward phase velocity is about 15km-1h.

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