Non-linear resonant wave-wave interaction (triad): case studies based on rocket and satellite data

Details Non-linear resonant wave-wave interaction (triad): case studies based on rocket and satellite data Non-linear resonant wave-wave interaction (triad): case studies based on rocket and satellite data

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.590..127w&link_type=abstract

In: 17th ESA Symposium on European Rocket and Balloon Programmes and Related Research, 30 May - 2 June 2005, Sandefjord, Norway.

Mathematics

Logic

Earth Atmosphere, Rocket Observations

Scientific paper

It is well known, that gravity waves have significant influence on circulation and thermal structure of the atmosphere by transporting energy and momentum. When reaching instability gravity waves dissipate energy, causing the surrounding wind regime to be modified. Besides pure wave breaking another possibility of energy transmission is possible: non-linear resonant wave-wave interaction ("triad"). In this paper, an earlier case study of (Widdel et al. 1994) is re-investigated looking for a possible triad within wind data obtained by the meteorological rocket based foil-chaff cloud and falling sphere technique, respectively, which were derived during the DYANA-campaign (Dynamics Adapted Network for the Atmosphere). The authors' speculation of seeing a triad in the data is now proved and parts of the investigation methods are also applied to satellite data. Additionally the observed wave field is dynamically characterized. Energy dissipation rates and the acceleration of the zonal mean flux are estimated applying linear and non-linear theory, respectively. Discrepancies are shown.

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