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Ann. Geophys., 15, 1123-1141, 1997
www.ann-geophys.net/15/1123/1997/
© European Geosciences Union 1997
An intercomparison between the GSWM, UARS, and ground based radar observations: a case-study in January 1993
S. E. Palo1, M. E. Hagan1, C. E. Meek2, R. A. Vincent3, M. D. Burrage4, C. McLandress5, S. J. Franke6, W. E. Ward5, R. R. Clark7, P. Hoffmann8, R. Johnson4, D. Kürschner9, A. H. Manson2, D. Murphy10, T. Nakamura11, Y. I. Portnyagin12, J. E. Salah13, R. Schminder9, W. Singer8, T. Tsuda11, T. S. Virdi14, and Q. Zhou15
1National Center for Atmospheric Research, Boulder, CO, USA
2University of Saskatchewan, Saskatoon, Canada
3University of Adelaide, Adelaide, Australia
4University of Michigan, Ann Arbor, MI, USA
5York University, Toronto, Canada
6University of Illinois, Urbana, IL, USA
7University of New Hampshire, Durham, NH, USA
8Institut für Atmosphärenphysik, Kühlungsborn, Germany
9Leipzig University, Collm, Germany
10Australian Antarctic Division, Kingston, Australia
11Kyoto University, Kyoto, Japan
12Institute of Experimental Meteorology, Obninsk, Russia
13Massachusetts Institute of Technology, Westford, MA, USA
14The University College of Wales, Aberystwyth, UK
15Arecibo Observatory, Arecibo, Puerto Ricoyth, UK
Abstract. The Global-Scale Wave Model (GSWM) is a
steady-state two-dimensional linearized model capable of simulating the solar
tides and planetary waves. In an effort to understand the capabilities and
limitations of the GSWM throughout the upper mesosphere and thermosphere a
comparative analysis with observational data is presented. A majority of the
observational data used in this study was collected during the World Day
campaign which ran from 20 January to 30 January 1993. During this campaign data
from 18 ground-based observational sites across the globe and two instruments
located on the UARS spacecraft were analyzed. Comparisons of these data with the
simulations from the GSWM indicate that the GSWM results are in reasonable
agreement with the observations. However, there are a number of cases where the
agreement is not particularly good. One such instance is for the semidiurnal
tide in the northern hemisphere, where the GSWM estimates may exceed
observations by 50% . Through a number of numerical simulations, it appears that
this discrepancy may be due to the eddy diffusivity profiles used by the GSWM.
Other differences relating to the diurnal tide and the quasi-two-day wave are
presented and discussed. Additionally, a discussion on the biases and aliasing
difficulties which may arise in the observational data is also presented.
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