1 Properties of the long - term oscillations in the middle 2 atmosphere based on observations from 3 TIMED / SABER 4 5
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چکیده
The properties of the annual, semiannual and triennial oscillations (AO, SAO and TO) in 15 the middle atmosphere have been investigated using the TIMED/SABER temperature data. The 16 lomb-Scargle and wavelet spectra were used to determine the dominant oscillations in the 17 background temperature field. The AO is prominent at the mid-latitudes. The AO amplitudes 18 present an asymmetry between the two Hemispheres, being larger in the mesosphere than in the 19 stratosphere. The SAO dominates the tropical regions, with three amplitude maxima at altitudes of 20 45, 75, and 85 km. The SAOs in the upper mesosphere (75 km) are out of phase with those in the 21 mesopause (85 km) in the tropical regions, which can generate an enhancement of 11 K at each 22 equinox, contributing to the lower mesospheric inversion layer. The TO is significant in the tropical 23 region, with amplitude being maximum at 35, 45 and 85 km. Result shows that there may be 24 potential interaction by the TO with SAO at 85km at the equator. The relation between ENSO and 25 the TO has also been discussed Result is that the ENSO signal may modulate the amplitude of the 26 TO, mainly in the lower stratosphere, and the real origin of the TO may possibly lie in the 27 wave-mean-flow interaction. 28
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تاریخ انتشار 2016