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Terdiurnal tide in the middle atmosphere


DFG JA836/30-1 (2014-2017)

A nonlinear mechanistic circulation model of the middle atmosphere is used to analyse the forcing mechanisms of the terdiurnal tide in the middle atmosphere. The used model MUAM (Middle and Upper Atmosphere Model) includes a full radiation parameterization scheme and is therefore capable to reproduce the terdiurnal tide. To analyse the forcing mechanisms, direct forcing through the 8-hour component of the diurnal solar forcing, and nonlinear interaction of the diurnal and semidiurnal in the advection terms in the momentum equations is analyzed. The work is completed by radar and satellite data analyses.

Cooperation partner: RSHU St. Petersburg

Bispectrum
Bispectrum of Collm radar winds, showing the interaction between the 12- and 24-hr tide
Model TDT
Zonal wind amplitude of the terdiurnal tide in January, as simulatd by MUAM



Publications related to the project:

Lilienthal, F., und Ch. Jacobi, 2016: The Role of Solar Heating in the Forcing of the Terdiurnal Tide, Rep. Inst. Meteorol. Univ. Leipzig, 54, 57-66, ISBN: 978-3-9814401-4-0.

Krug, A., F. Lilienthal, and Ch. Jacobi, 2015: The terdiurnal tide in the MUAM circulation model, Rep. Inst. Meteorol. Univ. Leipzig, 53, 33 - 44.

Fytterer, T., C. Arras, P. Hoffmann, and Ch. Jacobi, 2014: Global distribution of the migrating terdiurnal tide seen in sporadic E occurrence frequencies obtained from GPS radio occultations, Earth, Planets and Space, 66:79, doi:10.1186/1880-5981-66-79.

Jacobi, Ch., and T. Fytterer, 2013: Climatology of the 8-hour solar tide over Central Europe, Collm (51.3°N; 13.0°E). Proceedings of MST-13, 175-179.

Fytterer, T., C. Arras, and Ch. Jacobi, 2013: Terdiurnal signatures in midlatitude sporadic E layers occurrence rates, Rep. Inst. Meteorol. Univ. Leipzig, 51, 25-38 (pdf).

Fytterer, T., C. Arras, and C. Jacobi, 2013: Terdiurnal signatures in sporadic E layers at midlatitudes, Adv. Radio Sci., 11, 333-339.

Jacobi, Ch., and T. Fytterer, 2012: The 8-hour tide in the mesosphere and lower thermosphere over Collm (51.3°N; 13.0°E), 2004-2011. Adv. Radio Sci., 10, 265-270.


Last update 15 June 2017 by Ch. Jacobi