Is the Stratospheric QBO affected by Solar Wind Dynamic Pressure via an Annual Cycle Modulation?

Details Is the Stratospheric QBO affected by Solar Wind Dynamic Pressure via an Annual Cycle Modulation? Is the Stratospheric QBO affected by Solar Wind Dynamic Pressure via an Annual Cycle Modulation?

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31b1737l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA31B-1737

Astronomy and Astrophysics

Astrophysics

[1620] Global Change / Climate Dynamics, [3305] Atmospheric Processes / Climate Change And Variability, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles

Scientific paper

This study explores possible solar wind dynamic pressure effects on equatorial temperature and wind with an emphasis on the stratospheric Quasi-biennial Oscillation (QBO). The QBO phase occurrence and transition are closely linked to an annual cycle of tropical lower stratospheric temperature. The statistical response of the tropical temperature to solar wind dynamic pressure is characterized by ~1.25 K warming near the tropopause during the Boreal winter and spring and ~ 0.5 K cooling in the troposphere during the Austral winter and spring. The combined effect of this is a reduction of the amplitude of the annual cycle in temperature in the tropical tropopause region. The weakening of the annual cycle causes systematic and significant change in the tropical upwelling and therefore the strength and phase distribution of the QBO in the lower stratosphere. In the lower stratosphere, significantly stronger and more frequency easterly anomalies are found to be associated with high solar wind dynamic pressure during August to October. In addition to the seasonal response, there is a small but seasonally invariant response that is characterized by a vertical three-cell anomaly pattern with westerly anomalies in the troposphere and at 3-10 hPa and easterly anomalies in the lower stratosphere. We propose that significantly stronger easterly anomalies in the tropical lower stratosphere under high solar wind dynamic pressure during the Austral winter and spring are a consequence both of the initializing effect of this three-cell structure and of an amplification effect due to the seasonal modulation of the annual cycle.

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