Impact of orographic gravity wave drag on extended-range forecasts with the COLA-GCM

B. Kirtman, A. Vernekar, D. Dewitt, J. Zhou

Research output: Contribution to journalArticle

8 Scopus citations


The results show that GWD effects improve the forecast for both January and July particularly in the winter hemisphere. The GWD reduces the westerly bias in the zonal wind and the cold bias in the temperature. As a consequence of the changes in the momentum and temperature there are changes in the meridional mass transport such that monthly mean sea level pressures are improved pariticularly in the polar regions. Furthermore, as the westerly bias in the zonal momentum is reduced the momentum of the large scale flow is brought down to the Earth's surface where it is dissipated. This dissipation process increases the effective surface drag and enhances the mean meridional circulations. -from Authors

Original languageEnglish (US)
Pages (from-to)3-23
Number of pages21
Issue number1
StatePublished - Jan 1 1993
Externally publishedYes


ASJC Scopus subject areas

  • Atmospheric Science

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