✦ LIBER ✦

Assessing wind profile effects on the global atmospheric torque

✍ Scribed by P. M. A. Miranda; J. P. A. Martins; M. A. C. Teixeira

Publisher: John Wiley and Sons
Year: 2009
Tongue: English
Weight: 522 KB
Volume: 135
Category: Article
ISSN: 0035-9009
DOI: 10.1002/qj.393

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✦ Synopsis

Abstract

The impact of a new approach to the evaluation of surface gravity wave drag (GWD) is assessed. This approach uses linear theory, but incorporates the effects of wind profile shear and curvature, by means of a second‐order WKB approximation. While the theory predicts the possibility of either drag enhancement or reduction, depending on the wind profile, results obtained with the ERA‐40 reanalysis data clearly indicate the predominance of local drag enhancement. However, the global impact of shear on the atmospheric axial GWD torque comes mostly from regions with predominantly easterly flow, contributing to a slight reduction of the bias found in different studies of the global angular momentum budget. The relative correction due to shear on linear GWD is found not to depend too strongly on the levels chosen for the computation of the low‐level wind derivatives. Copyright © 2009 Royal Meteorological Society

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