Preprint Article Version 1 NOT YET PEER-REVIEWED

Properties of the long-term oscillations in the middle atmosphere based on observations from TIMED/SABER

  1. College of Meteorology and Oceanology, PLA University of Science and Technology, Nanjing, China
  2. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, China
Version 1 : Received: 1 October 2016 / Approved: 4 October 2016 / Online: 4 October 2016 (15:28:44 CEST)
Version 2 : Received: 4 October 2016 / Approved: 6 October 2016 / Online: 6 October 2016 (08:52:44 CEST)

How to cite: Zhang, Y.; Zhou, S.; Shi, H.; Sheng, Z.; Shi, W.; Du, H.; Fan, Z. Properties of the long-term oscillations in the middle atmosphere based on observations from TIMED/SABER. Preprints 2016, 2016100008 (doi: 10.20944/preprints201610.0008.v1). Zhang, Y.; Zhou, S.; Shi, H.; Sheng, Z.; Shi, W.; Du, H.; Fan, Z. Properties of the long-term oscillations in the middle atmosphere based on observations from TIMED/SABER. Preprints 2016, 2016100008 (doi: 10.20944/preprints201610.0008.v1).

Abstract

The properties of the annual, semiannual and triennial oscillations (AO, SAO and TO) in the middle atmosphere have been investigated using the TIMED/SABER temperature data. The lomb-Scargle and wavelet spectra were used to determine the dominant oscillations in the background temperature field. The AO is prominent at the mid-latitudes. The AO amplitudes present an asymmetry between the two Hemispheres, being larger in the mesosphere than in the stratosphere. The SAO dominates the tropical regions, with three amplitude maxima at altitudes of 45, 75, and 85 km. The SAOs in the upper mesosphere (75 km) are out of phase with those in the mesopause (85 km) in the tropical regions, which can generate an enhancement of 11 K at each equinox, contributing to the lower mesospheric inversion layer. The TO is significant in the tropical region, with amplitude being maximum at 35, 45 and 85 km. Result shows that there may be potential interaction by the TO with SAO at 85km at the equator. The relation between ENSO and the TO has also been discussed Result is that the ENSO signal may modulate the amplitude of the TO, mainly in the lower stratosphere, and the real origin of the TO may possibly lie in the wave-mean-flow interaction.

Subject Areas

AO; SAO; TO; amplitude; phase

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