Assessing wind profile effects on the global atmospheric torque

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Miranda, PMA (Author) Other; Martins, JPA (Author) Other; Teixeira, MAC (Author) Other

Journal

The Journal is awaiting validation by the Administrative Services.

Title: QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY

Vol. 135

Pages: 807-814

ISSN: 0035-9009

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 10 Citations

Other information

Authenticus ID: P-003-MBW

DOI: 10.1002/qj.393

Abstract (EN): 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 oil 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 (C) 2009 Royal Meteorological Society

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8