Publication Abstracts

Druyan and Hall 1996

Druyan, L.M., and T.M. Hall, 1996: The sensitivity of African wave disturbances to remote forcing. J. Appl. Meteorol., 35, 1100-1110, doi:10.1175/1520-0450(1996)035<1100:TSOAWD>2.0.CO;2.

Ensembles of three simulations each, forced by June-September 1987 and 1988 sea-surface temperatures (SST) respectively, were made with a new version of the general circulation model of the NASA/Goddard Institute for Space Studies. Time series of 6-h meridional winds at about 780 mb over West Africa were spectrally analyzed to detect African wave disturbances whose properties for the two ensembles are compared and contrasted. The realistically simulated stronger 1988 Tropical Easterly Jet and the associated stronger upper-tropospheric divergence are components of interannual differences in the SST-forced planetary circulation, which correspond to higher amplitudes of African wave activity and concomitant excesses in 1988 Sahel rainfall rates. Results do not show, however, that most of the heavier precipitation was spatially organized by African wave structures. The excess rainfall is associated with stronger mean southerly circulation in the lower troposphere which carried more moisture into the Sahel. Nevertheless, because waves modulate winds, convergence, humidity and precipitation, the study suggests that they serve as a teleconnection mechanism whereby extreme Pacific Ocean SST anomalies are able to influence climate.

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BibTeX Citation

  author={Druyan, L. M. and Hall, T. M.},
  title={The sensitivity of African wave disturbances to remote forcing},
  journal={J. Appl. Meteorol.},

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RIS Citation

ID  - dr08100v
AU  - Druyan, L. M.
AU  - Hall, T. M.
PY  - 1996
TI  - The sensitivity of African wave disturbances to remote forcing
JA  - J. Appl. Meteorol.
VL  - 35
SP  - 1100
EP  - 1110
DO  - 10.1175/1520-0450(1996)035%3C1100%3ATSOAWD%3E2.0.CO;2
ER  -

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