Wind-profiler observations of gravity waves produced by convection at mid-latitudes Y. G. Choi1, S. C. Lee2, A. J. McDonald3, and D. A. Hooper4 1Geophysical Prospecting Laboratory, Seoul National University, Korea 2Department of Physics, Kangnung National University, Korea 3Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand 4Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, UK
Abstract. This work presents a case study which includes regions of large rapidly
varying vertical velocities observed by a VHF wind-profiler at Aberystwyth
(52.4° N, 4.1° W). Analysis indicates that this region is
associated with gravity waves above the tropopause level and simultaneous
regions of convective activity below the tropopause level. This case study
also suggests that convective activity can be identified effectively by
finding periods of large uncertainties on the derived velocities. These
regions are hypothesized to be related to regions of small-scale
inhomogeneity in the wind field.
Examination suggests that the large vertical velocity fluctuations above
these convective regions are short period gravity wave packets as expected
from theory. In addition the vertical flux of the horizontal momentum
associated with the gravity waves also displays the pattern of reversal
observed in previous studies.
Citation: Choi, Y. G., Lee, S. C., McDonald, A. J., and Hooper, D. A.: Wind-profiler observations of gravity waves produced by convection at mid-latitudes, Atmos. Chem. Phys., 6, 2825-2836, doi:10.5194/acp-6-2825-2006, 2006.