case study of stratospheric gravity waves of convective origin over arctic scandinavia – vhf radar observations and numerical modelling
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ID: 186862
2013
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Abstract
Orography is a well-known source of gravity and inertia-gravity waves in the
atmosphere. Other sources, such as convection, are also known to be
potentially important but the large amplitude of orographic waves over
Scandinavia has generally precluded the possibility to study such other
sources experimentally in this region. In order to better understand the
origin of stratospheric gravity waves observed by the VHF radar ESRAD (Esrange MST radar) over
Kiruna, in Arctic Sweden (67.88° N, 21.10° E),
observations have been compared to simulations made using the Weather
Research and Forecasting model (WRF) with and without the effects of
orography and clouds. This case study concerns gravity waves observed from
00:00 UTC on 18 February to 12:00 UTC on 20 February 2007. We focus on the
wave signatures in the static stability field and vertical wind deduced from
the simulations and from the observations as these are the parameters which
are provided by the observations with the best height coverage. As is common
at this site, orographic gravity waves were produced over the Scandinavian
mountains and observed by the radar. However, at the same time, southward
propagation of fronts in the Barents Sea created short-period waves which
propagated into the stratosphere and were transported, embedded in the
cyclonic winds, over the radar site.
| Reference Key |
rchou2013annalescase
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|---|---|
| Authors | ;A. Réchou;J. Arnault;P. Dalin;S. Kirkwood |
| Journal | journal of food measurement and characterization |
| Year | 2013 |
| DOI |
10.5194/angeo-31-239-2013
|
| URL | |
| Keywords |
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