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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2020-14
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-14
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  14 Apr 2020

14 Apr 2020

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A revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Intra-annual variations of spectrally resolved gravity wave activity in the UMLT region

René Sedlak1, Alexandra Zuhr1,2,a, Carsten Schmidt2, Sabine Wüst2, Michael Bittner1,2, Goderdzi G. Didebulidze3, and Colin Price4 René Sedlak et al.
  • 1Institute of Physics, University of Augsburg, Augsburg, Germany
  • 2German Remote Sensing Data Center, German Aerospace Center, Oberpfaffenhofen, Germany
  • 3Georgian National Astrophysical Observatory, Ilia State University, Tbilisi, Georgia
  • 4Porter School of the Environment and Earth Sciences, Tel Aviv University, Israel
  • anow at: Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany

Abstract. The period range between 6 min and 480 min is known to represent the major part of the gravity wave spectrum driving mesospheric dynamics. We present a method using wavelet analysis to calculate gravity wave activity with a high period-resolution and apply it to temperature data acquired with the OH* airglow spectrometers GRIPS (GRound-based Infrared P-branch Spectrometer) within the framework of the NDMC (Network for the Detection of Mesospheric Change; https://ndmc.dlr.de). We analyse data measured at the NDMC sites Abastumani in Georgia (ABA, 41.75° N, 42.82° E), ALOMAR in Norway (ALR, 69.28° N, 16.01° E), Neumayer III in the Antarctic (NEU, 70.67° S, 8.27° W), Observatoire de Haute-Provence in France (OHP, 43.93° N, 5.71° E), Oberpfaffenhofen in Germany (OPN, 48.09° N, 11.28° E), Sonnblick in Austria (SBO, 47.05° N, 12.95° E), Tel Aviv in Israel (TAV, 32.11° N, 34.80° E), and the Environmental Research Station Schneefernerhaus on top of Mt. Zugspitze, Germany (UFS, 47.42° N, 10.98° E). All eight instruments are identical in construction and deliver consistent and comparable data sets.

For periods shorter than 60 min, gravity wave activity is found to be relatively low and hardly shows any seasonal variability on the time scale of months. We find a semi-annual cycle with maxima during winter and summer for gravity waves with periods longer than 60 min, which gradually develops into an annual cycle with a winter maximum for longer periods. The transition from a semi-annual pattern to a primarily annual pattern occurs around a gravity wave period of 200 min. Although there are indications of enhanced gravity wave sources above mountainous terrain, the overall pattern of gravity wave activity does not differ significantly for the abovementioned observation sites. Thus, large-scale mechanisms such as stratospheric wind filtering seem to dominate the temporal course of mesospheric gravity wave activity.

René Sedlak et al.

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René Sedlak et al.

René Sedlak et al.

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Latest update: 21 Sep 2020
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Short summary
Gravity wave (GW) activity in the UMLT in the period range 6–480 min is calculated by applying a wavelet analysis to nocturnal temperature time series derived from OH* airglow spectrometers. We analyse measurements from eight different locations at different latitudes. GW activity shows strong period dependence. We find hardly any seasonal variability for periods below 60 min and a semi-annual cycle for periods longer than 60 min that evolves into an annual cycle around a period of 200 min.
Gravity wave (GW) activity in the UMLT in the period range 6–480 min is calculated by applying a...
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