Wednesday, 25 June 2003
Mesoscale waves and turbulence in the proximity of synoptic-scale flow features
To determine if a linkage exists between the intensity of mesoscale turbulence or mesoscale gravity waves and synoptic-scale features in the mid latitude atmosphere, this study compares MST radar turbulence and gravity wave measurements with analyzed synoptic scale wind fields. The radar data used in this study consisted of the uncalibrated back-scattered power measured at the MU radar in Japan from 1991-1996 and Cn2 measurements taken at the WSMR radar in New Mexico during the same period, as well as vertical velocity variance measurements from both radars as a proxy for gravity wave intensity. The analysis period was confined to the cold season months when mean wind speeds in the upper troposphere were relatively high at both stations. Months used for study at MU were October through April of each year and at WSMR the months used were November through April of each year. Analysis of synoptic-scale meteorological fields was accomplished through the use of NCAR/NCEP reanalysis data for the same periods. This report will concentrate on comparisons involving analyzed winds in the upper troposphere above each station. The reanalysis data were used to compute wind shears, relative vorticity, and potential vorticity of the synoptic scale flow. The objective is to establish relationships between variations in the synoptic-scale winds and the locally measured turbulence and gravity wave intensity in the vicinity of the tropopause.
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