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

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

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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
JournalAtmosfera
Volume6
Issue number1
StatePublished - 1993
Externally publishedYes

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gravity wave
drag
general circulation model
momentum
westerly
meridional circulation
sea level pressure
zonal wind
mass transport
polar region
dissipation
temperature
winter
forecast
effect
cold

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Impact of orographic gravity wave drag on extended-range forecasts with the COLA-GCM. / Kirtman, Benjamin; Vernekar, A.; Dewitt, D.; Zhou, J.

In: Atmosfera, Vol. 6, No. 1, 1993, p. 3-23.

Research output: Contribution to journalArticle

Kirtman, B, Vernekar, A, Dewitt, D & Zhou, J 1993, 'Impact of orographic gravity wave drag on extended-range forecasts with the COLA-GCM', Atmosfera, vol. 6, no. 1, pp. 3-23.
Kirtman, Benjamin ; Vernekar, A. ; Dewitt, D. ; Zhou, J. / Impact of orographic gravity wave drag on extended-range forecasts with the COLA-GCM. In: Atmosfera. 1993 ; Vol. 6, No. 1. pp. 3-23.
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