极区夏季70—100km大气垂直速度扰动功率谱的观测

使用1987年夏季MAC/SINEcampaign期间在挪威北部的Andenes发射的5枚chaff火箭垂直速度数据研究了70—100km高度范围内大气垂直速度扰动垂直波数谱.发现垂直速度垂直波数谱在39×10-4m－1处有1个谱缺口.在大于这个谱缺口的垂直波数范围,垂直速度垂直波数谱与饱和谱模式有好的一致.在小于这个谱缺口的垂直波数范围,垂直速度垂直波数谱有谱斜率－1.87和谱振幅比饱和谱振幅低1个量级,认为在低波数,除重力波外的其它地球物理过程存在于垂直速度扰动中. 

OBSERVATIONS OF SPECTRUM OF VERTICAL VELOCITY FLUCTUATIONS AT HEIGHTS OF 70-100 km IN POLAR SUMMER

Vertical wavenumber spectrum of vertical velocity fluctuations of atmosphere at heights of 70 - 100km is presented using vertical velocity data obtained from five chaff rocket measurements carried out during the MAC /SINE campaign in the summer of 1987 at Andenes, in Northern Norway (69°N, 16°E). The atmospheric vdrical wavenumber spectrum of the vertical velocity has a spectral gap at m=3.9×10-4m-1. At vertical wavenumbers greater than the spectral gap the vertical wavenumber spectrum agerees well with the saturated spectrum model. At vertieal wavenumbers smaller than the spectrla gap the vertical wavenumber spectrum has a slope of - 1.87 and a spectral amplitude that is an oder of magnitude lower than the saturated spectrum, suggesting that other geophysical processes besides gravity waves'may exist in the verticla velocity fluctuations.