What factors affect planetary wave driving in the Southern Hemisphere in spring?

Details What factors affect planetary wave driving in the Southern Hemisphere in spring? What factors affect planetary wave driving in the Southern Hemisphere in spring?

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.a24c..04h&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #A24C-04

Physics

[0342] Atmospheric Composition And Structure / Middle Atmosphere: Energy Deposition, [3334] Atmospheric Processes / Middle Atmosphere Dynamics, [3337] Atmospheric Processes / Global Climate Models

Scientific paper

The timing of the breakup of the Antarctic vortex is determined by planetary wave driving at Southern Hemisphere (SH) mid-latitudes in spring. A previous modeling study found that weaker than observed heat flux in October and November led to a delayed breakup of the Antarctic vortex. In an attempt to better understand the seasonal cycle of SH heat flux at 100hPa and increase wave driving in version 2 of the Goddard Earth Observing System (GEOS) chemistry-climate model (CCM), this work examines the sensitivity of heat flux to a variety of boundary conditions and model parameters. The inclusion of a quasi-biennial oscillation (QBO), the choice of photolysis rates and the representation of gravity wave drag do not affect October/November heat flux. Furthermore, boundary conditions (such as sea surface temperatures) do not determine the heat flux, as the magnitude and seasonal cycle of 100hPa heat flux differs between CCMs using the same ‘recent past’ scenario. Heat flux magnitudes in the critical October/November period, and thus the timing of the vortex breakup, are improved when either the horizontal resolution or SH precipitation is increased.

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