Other
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....1786n&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #1786
Other
Scientific paper
In the early morning hours (UTC) of 14 October 1999 during the CASES-99 field campaign, a series of gravity waves were observed by aircraft, tethered lifting systems, radiosondes, Raman and high-resolution Doppler lidar, an instrumented 60-m tower, and a surface array of microbarographs. Of particular interest were waves observed between 04:00 and 06:00 UTC. Analyses of these data indicate that these were ducted gravity waves within the first 1000 m of the PBL. Closer examination of the data identified two ducting regions, one at about 100 m AGL and one at about 600 m AGL. The waves had periods of about 5 minutes, phase speeds of about 10 m/s, and horizontal wavelengths of about 3000 m. Theoretical analysis support these observations. Waves within these separated ducts interacted through a process known as Eckart's resonance. The intrinsic frequencies of the resonant modes of these interacting waves are predicted to approach one another when plotted as functions of wavenumber, and are refereed to as "kissing" modes. Analysis of sonic anemometer and microbarograph data at the 50, 30, and 1.5 m levels of the CASES tower shows that the turbulence kinetic energy is modulated by these gravity waves. The turbulence kinetic energy laged the pressure oscillations by about 130 degrees at the 50 and 30 m heights; however, at the 1.5 m height the coherence between turbulence and pressure oscillations was low. Eckart's resonance may explain the observations that the amplitudes of gravity waves in the planetary boundary layer often appear to be modulated.
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