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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-2019-140
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-140
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 01 Oct 2019

Submitted as: regular paper | 01 Oct 2019

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

Migrating and Non-Migrating Tides Observed in the Stratosphere from FORMOSAT-3/COSMIC Temperature Retrievals

Uma Das1, William Ward2, Chen Jeih Pan3, and Sanat Kumar Das4 Uma Das et al.
  • 1Indian Institute of Information Technology Kalyani, Kalyani, West Bengal, India
  • 2Department of Physics, University of New Brunswick, Fredericton, Canada
  • 3Institute of Space Science, National Central University, Zhongli, Taiwan
  • 4Environmental Sciences Section, Bose Institute, Kolkata, India

Abstract. FORMOSAT-3/COSMIC temperature data during 2009 to 2010 are analysed for tides in the middle atmosphere from ~ 10 to 50 km. COSMIC is a set of six micro satellites in near sun synchronous orbits with 30° orbital separations and provides good phase space sampling of tides. Short term tidal variability is deduced by considering ± 10 days' data together. The DW1 tide is found to peak over the equator at 30 km. It maximises and slightly shifts poleward during winters and thus is attributed to ozone absorption. Over mid and high latitudes, DW1 and the non-migrating tides DS0 and DW2 are intermittent in nature. Numerical experiments in the current study show that these could be a result of aliasing as they are found to occur at times of steep rise or fall in the mean temperature, particularly during the SSW of 2010. Further, stationary planetary wave components are found to be of very large amplitudes in the northern hemispheres reaching 18 K at 30 km over 65° N. By using data from COSMIC over shorter durations, aliasing between SPW and non-migrating tides is reduced and thus results in the large amplitudes of the former. This study clearly indicates that non-linear interactions are not a very important source of generation of the non migrating tides in the high latitude winter hemisphere. There is also a modulation of SPW1 by ~ 60 days in the high latitudes, which was not seen earlier.

Uma Das et al.
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Short summary
Temperatures obtained from FORMOSAT-3/COSMIC observations in the stratosphere are analysed for tidal variations. It is seen that the non-migrating tides are not very significant in the high latitude winter stratosphere. It is shown in this study that the observed amplitudes of these tides are most probably a result of aliasing and they are not geophysical in nature. Thus, the process through which it was believed that they are produced (non-linear interactions) seems to be unimportant.
Temperatures obtained from FORMOSAT-3/COSMIC observations in the stratosphere are analysed for...
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