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The Turbopause Experiment: Atmospheric Stability and Turbulent Structure Spanning the Turbopause Altitude : Volume 29, Issue 12 (23/12/2011)

By Lehmacher, G. A.

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Book Id: WPLBN0003991922
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: The Turbopause Experiment: Atmospheric Stability and Turbulent Structure Spanning the Turbopause Altitude : Volume 29, Issue 12 (23/12/2011)  
Author: Lehmacher, G. A.
Volume: Vol. 29, Issue 12
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Bilén, S. G., Larsen, M. F., Lehmacher, G. A., Rapp, M., Croskey, C. L., Scott, T. D.,...Mitchell, J. D. (2011). The Turbopause Experiment: Atmospheric Stability and Turbulent Structure Spanning the Turbopause Altitude : Volume 29, Issue 12 (23/12/2011). Retrieved from

Description: Department of Physics & Astronomy, Clemson University, Clemson, SC, USA. Very few sequences of high resolution wind and temperature measurements in the lower thermosphere are available in the literature, which makes it difficult to verify the simulation results of models that would provide better understanding of the complex dynamics of the region. To address this problem the Turbopause experiment used four rockets launched over a period of approximately two hours from Poker Flat Research Range, Alaska (64° N, 147° W) on the night of 17–18 February 2009. All four rocket payloads released trimethyl aluminum trails for neutral wind and turbulence measurements, and two of the rockets carried ionization gauges and fixed-bias Langmuir probes measuring neutral and electron densities, small-scale fluctuations and neutral temperatures. Two lidars monitored temperature structure and sodium densities. The observations were made under quiet geomagnetic conditions and show persistence in the wind magnitudes and shears throughout the observing period while being modulated by inertia-gravity waves. High resolution temperature profiles show the winter polar mesosphere and lower thermosphere in a state of relatively low stability with several quasi-adiabatic layers between 74 and 103 km. Temperature and wind data were combined to calculate Richardson number profiles. Evidence for turbulence comes from simultaneous observations of density fluctuations and downward transport of sodium in a mixed layer near 75 km; the observation of turbulent fluctuations and energy dissipation from 87–90 km; and fast and irregular trail expansion at 90–93 km, and especially between 95 to 103 km. The regions of turbulent trails agree well with regions of quasi-adiabatic temperature gradients. Above 103 km, trail diffusion was mainly laminar; however, unusual features and vortices in the trail diffusion were observed up to 118 km that have not been as prevalent or as clearly evident in earlier trail releases.

The Turbopause experiment: atmospheric stability and turbulent structure spanning the turbopause altitude

Achatz, U.: Gravity-wave breaking: Linear and primary nonlinear dynamics, Adv. Space Res., 40, 719–733, 2007.; Blamont, J. E.: Turbulence in the atmospheric motions between 90 and 130 km of altitude, Planet. Space Sci., 10, 89–101, 1963.; Bishop, R. L., Larsen, M. F., Hecht, J. H., Liu, A. Z., and Gardner, C. S.: TOMEX: Mesospheric and lower thermospheric diffusivities and instability layers, J. Geophys. Res., 109, D02S03, doi:10.1029/2002JD003079, 2004.; Bishop, R. L., Earle, G. D., Larsen, M. F., Swenson, C. M., Carlson, C. G., Roddy, P. A., Fish, C. C., and Bullett, T. W.: Sequential observations of the local neutral wind field structure associated with E region plasma layers, J. Geophys. Res., 110, A04309, doi:10.1029/2004JA010686, 2005.; Blamont, J. E. and de Jager, C.: Upper atmospheric turbulence near the 100 km level, Ann. Geophys., 17, 134–144, 1961.; Collins, R. L. and Smith, R. W.: Evidence of damping and overturning of gravity waves in the arctic mesosphere: Na lidar and OH temperature observations, J. Atmos. Solar-Terr. Phys., 66, 867–879, 2004.; Collins, R. L., Lehmacher, G. A., Larsen, M. F., and Mizutani, K.: Estimates of vertical eddy diffusivity in the upper mesosphere in the presence of a mesospheric inversion layer, Ann. Geophys., 29, 2019–2029, doi:10.5194/angeo-29-2019-2011, 2011.; Croskey, C. L., Mitchell, J. D., Friedrich, M., Schmidlin, F. J., and Goldberg, R. A.: In-situ electron and ion measurements and observed gravity wave effects in the polar mesosphere during the MaCWAVE program, Ann. Geophys., 24, 1267–1278, doi:10.5194/angeo-24-1267-2006, 2006.; Danilov, A. D., Kalgin, U. A., and Pokhunkov, A. A.: Variation of the turbopause level in the polar regions. Space Research XIX (83), 173–176, 1979.; Giebeler, J., Lübken, F.-J., and Nägele, M.: CONE – a new sensor for in situ observations of neutral and plasma density fluctuations, Proc. 11th ESA Symp. Europ. Rocket Balloon Progr., Montreux, Switzerland, ESA SP-355, 311–318, 1993.; Hall, C. M., Meek, C. E., Manson, A. H., and Nozawa, S.: Turbopause determination, climatology, and climatic trends using medium frequency radars at 52° N and 70° N, J. Geophys. Res., 113, D13104, doi:10.1029/2008JD009938, 2008.; Hecht, J. H., Liu, A. Z., Bishop, R. L., Clemmons, J. H., Gardner, C. S., Larsen, M. F., Roble, R. G., Swenson, G. R., and Walterscheid, R. L.: An overview of observations of unstable layers during the Turbulent Oxygen Mixing Experiment (TOMEX), J. Geophys. Res., 109, D02S01, doi:10.1029/2002JD003123, 2004.; Hillert, W., Lübken, F.-J., and Lehmacher, G.: TOTAL: a rocket-borne instrument for high resolution measurements of neutral air turbulence during DYANA, J. Atmos. Terr. Phys., 56, 1835–1852, 1994.; Ishii, M., Conde, M., Smith, R. W., Krynicki, M., Sagawa, E., and Watari, S.: Vertical wind observations with two Fabry-Perot interferometers at Poker Flat, Alaska, J. Geophys. Res., 106, 10537–10551, 2001.; Larsen, M. F.: Winds and shears in the mesosphere and lower thermosphere: Results from four decades of chemical release wind measurements, J. Geophys. Res., 107, 1215, doi:10.1029/2001JA000218, 2002.; Larsen, M. F. and Fesen, C. G.: Accuracy issues of the existing thermospheric wind models: can we rely on them in seeking solutions to wind-driven problems?, Ann. Geophys., 27, 2277–2284, doi:10.5194/angeo-27-2277-2009, 2009.; Larsen, M. F., Liu, A. Z., Gardner, C. S., Kelley, M. C., Collins, S. C., Friedman, J., and Hecht, J.


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