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VHF profiler observations of winds and waves in the troposphere during the Darwin Area

Summary: VHF profiler observations of winds and waves
in the troposphere during the Darwin Area
Wave Experiment (DAWEX)
R. A. Vincent, A. MacKinnon, and I. M. Reid
Department of Physics, University of Adelaide, Adelaide, South Australia
M. J. Alexander
Colorado Research Associates, Boulder, Colorado, USA
Received 1 March 2004; revised 26 May 2004; accepted 2 June 2004; published 11 August 2004.
[1] AVHF atmospheric radar (wind profiler) was used to study tropospheric winds during
the Darwin Area Wave Experiment (DAWEX). The profiler, which operated at a
frequency of 54.1 MHz, was located at Pirlangimpi (Garden Point) (11.4S, 130.5E) on
the Tiwi Islands. Observations were made regularly up to heights near 8 km, with
maximum heights occurring when convective activity was strongest. Mean winds
observed between October and December 2001 are in good agreement with conditions that
prevailed across northern Australia during this period. During the first two intensive
observation periods (IOP) during October and November, the zonal and meridional wind
components were westward and northward, respectively, with stronger values in
November. By the time of IOP3 in mid-December, the zonal flow was eastward, a pattern
that is typical of the Australian monsoon. Fluctuations in the three wind components for
periods less than 3 hours are analyzed for IOP2 in November, when strong convective


Source: Alexander, M. Joan - Colorado Research Associates Division, Northwest Research Associates, Inc.


Collections: Geosciences