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Journal Article

The "wave turbopause"


Schmidt,  H.       
Middle and Upper Atmosphere, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Offermann, D., Jarisch, M., Schmidt, H., Oberheide, J., Grossmann, K. U., Gusev, O., et al. (2007). The "wave turbopause". Journal of Atmospheric and Solar-Terrestrial Physics, 69, 2139-2158. doi:10.1016/j.jastp.2007.05.012.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-FA93-A
The "wave turbopause" is defined as the mesospheric altitude level where the temperature fluctuation field indicates a substantial increase in wave amplitudes in the vertical direction. The turbopause altitude is analyzed on the basis of four years of SABER data (2002-2005, Version 1.06). Substantial seasonal and latitudinal variations are found, with some interannual variability also present. Seasonal changes are annual at high latitudes, semi-annual at low latitudes, and a mixture of both at middle latitudes. Southern hemisphere data are similar as in the North if shifted by half a year. Latitudinal variations show a minimum in the tropics and two relative maxima at middle latitudes. The "wave turbopause" is found near to zero-wind lines or low-wind zones (zonal wind). It is compared to rocket and other measurements, and interesting similarities are obtained. The wave turbopause can also be found in the HAMMONIA GCM. A preliminary analysis shows results similar to those of the SABER measurements.