Quantification of gravity wave forcing in driving the stratospheric Quasi-Biennial Oscillation

Details Quantification of gravity wave forcing in driving the stratospheric Quasi-Biennial Oscillation Quantification of gravity wave forcing in driving the stratospheric Quasi-Biennial Oscillation

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3509805a&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 9, CiteID L09805

Physics

2

Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Composition And Structure: Middle Atmosphere: Energy Deposition (3334), Atmospheric Composition And Structure: Instruments And Techniques

Scientific paper

Using long-term Rayleigh lidar temperature observations during April 1998-April 2005 in the lower stratospheric region, momentum flux divergence of the gravity waves of periods 0.5-1 and 2-4 hours are estimated over Gadanki (13.5°N, 79.2°E), India. Monthly mean zonal winds from NCEP/NCAR reanalysis data over Gadanki at two pressure levels 10 and 20 hPa are used to study the characteristics of the Quasi-Biennial Oscillation (QBO) and its month-to-month acceleration. This observed mean flow acceleration is compared with that estimated from the momentum flux divergence of gravity waves, which led to a better insight into the role of gravity waves in driving the QBO. The present analysis reveals that the contribution of gravity waves towards the westerly phase of QBO varies from ~10-60% while that during easterly phase from ~10-30%. The present study thus quantifies the role of gravity waves in driving the easterly and westerly phases of QBO.

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