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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-25
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-25
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 08 Mar 2019

Regular paper | 08 Mar 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

On the evaluation of the phase relation between temperature and wind tides based on ground-based measurements and reanalysis data in the middle atmosphere

Kathrin Baumgarten and Gunter Stober Kathrin Baumgarten and Gunter Stober
  • Leibniz-Institute of Atmospheric Physics at the University of Rostock, Kühlungsborn, Germany

Abstract. The variability of the middle atmosphere is driven by a variety of waves covering different spatial and temporal scales. We are diagnosing the variability of the thermal tides due to changes in the background wind by an adaptive spectral filter, which takes the intermittency of tides into account. We apply this diagnostic to temperature observations from a daylight-capable lidar at mid-latitudes (54° N, 12° E) as well as to reanalysis data of horizontal winds from MERRA-2. These reanalysis data provide additional wind information in the altitude range between 30 and 70 km at the location of the lidar as well as on a global perspective. Using the global data gives information of the tidal modes seen at one location. A comparison of the temperature and wind information affirms whether there is a fixed phase relation of the tidal waves in the temperature and the wind data. We found that in general the local tidal signatures are dominated by migrating tidal modes and the signature is weaker in temperatures than in winds. While the meridional wind tide is leading the zonal wind tide by 90°, the phase relation between the temperature and the wind tide is more complex. At certain altitudes the temperature tide follows the zonal wind tide. This knowledge helps to improve the interpretation of the seasonal variation of tides from different observables especially when only data from single locations are used. The findings provide additional information about the phase stability of tidal waves and the results clearly show the importance of a measurement acquisition on a routine basis with high temporal and spatial resolution.

Kathrin Baumgarten and Gunter Stober
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Status: open (until 19 Apr 2019)
Status: open (until 19 Apr 2019)
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Kathrin Baumgarten and Gunter Stober
Kathrin Baumgarten and Gunter Stober
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Short summary
The paper presents the variability of thermal tides in the middle atmosphere from temperature observations as well as from horizontal wind data using a new diagnostic approach which takes into account a possible intermittency of tides. The data is analyzed from a local as well as from a global perspective to distinguish between different tidal modes. Surprisingly, there are dominating tidal modes, which are seen in the local data and a phase relation between temperature and winds is evaluated.
The paper presents the variability of thermal tides in the middle atmosphere from temperature...
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