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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 10, issue 12 | Copyright
Atmos. Meas. Tech., 10, 4895-4903, 2017
https://doi.org/10.5194/amt-10-4895-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 14 Dec 2017

Research article | 14 Dec 2017

Variability of the Brunt–Väisälä frequency at the OH* layer height

Sabine Wüst1, Michael Bittner1,2, Jeng-Hwa Yee3, Martin G. Mlynczak4, and James M. Russell III5 Sabine Wüst et al.
  • 1Deutsches Fernerkundungsdatenzentrum (DFD), Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Germany
  • 2Institut für Physik, Universität Augsburg, Augsburg, Germany
  • 3Applied Physics Laboratory, The Johns Hopkins University, Laurel, Maryland, USA
  • 4NASA Langley Research Center, Hampton, Virginia, USA
  • 5Center for Atmospheric Sciences, Hampton, Virginia, USA

Abstract. In and near the Alpine region, the most dense subnetwork of identical NDMC (Network for the Detection of Mesospheric Change, https://www.wdc.dlr.de/ndmc/) instruments can be found: five stations are equipped with OH* spectrometers which deliver a time series of mesopause temperature for each cloudless or only partially cloudy night. These measurements are suitable for the derivation of the density of gravity wave potential energy, provided that the Brunt–Väisälä frequency is known.

However, OH* spectrometers do not deliver vertically resolved temperature information, which is necessary for the calculation of the Brunt–Väisälä frequency. Co-located measurements or climatological values are needed.

We use 14 years of satellite-based temperature data (TIMED-SABER, 2002–2015) to investigate the inter- and intra-annual variability of the Brunt–Väisälä frequency at the OH* layer height between 43.93–48.09°N and 5.71–12.95°E and provide a climatology.

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In the Alpine region, the most dense subnetwork of identical NDMC (Network for the Detection of Mesospheric Change) instruments can be found. With these instruments the mesopause temperature is derived each night. The data can be used for the investigation of the amount of energy which is transported by small-scale atmospheric waves, known as gravity waves, provided that the so-called Brunt–Väisälä frequency is known. Information about the variability of this parameter is provided here.
In the Alpine region, the most dense subnetwork of identical NDMC (Network for the Detection of...
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