Antarctic Mesospheric Temperature Anomaly in 2007 (Invited)

Details Antarctic Mesospheric Temperature Anomaly in 2007 (Invited) Antarctic Mesospheric Temperature Anomaly in 2007 (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa22a..08a&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA22A-08

Physics

[3332] Atmospheric Processes / Mesospheric Dynamics, [3332] Atmospheric Processes / Mesospheric Dynamics, [3349] Atmospheric Processes / Polar Meteorology, [3389] Atmospheric Processes / Tides And Planetary Waves

Scientific paper

In this paper we present mesospheric temperatures at high Southern latitudes during the 2006-2008 period, showing anomalously high temperatures during the 2007 Austral winter coincident with increased planetary wave activity in the stratosphere. OH rotational temperatures observed in Antarctica from South Pole and Davis Stations and mesospheric temperatures measured from the NASA Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) satellite have been used here to highlight unusually high temperatures during the 2007 Austral winter. OH temperatures have been shown to be influenced by the F10.7 solar flux. Over the 2006-2008 period, the solar flux was in its declining phase and therefore one would expect MLT temperatures to be lower in the consecutive years as the solar flux declines. However, both the airglow and satellite measurements show 2007 temperatures to be aberrantly higher than the average wintertime temperatures from 2006 and 2008. These temperature enhancements are not limited to the middle atmosphere as the NCEP/NCAR Reanalysis data also reveals the 2007 temperature anomaly at stratospheric heights. Analyses of NCEP and Navy Operational Global Atmospheric Prediction System - Advanced Level Physics High-Altitude (NOGAPS-ALPHA) data show that the 2007 temperature anomaly occurred during periods of large planetary wave activity. NOGAPS-ALPHA Eliassen-Palm (EP) cross sections show a correlation between temperature enhancements and flux divergence which suggests that adiabatic warming might be responsible for the elevated temperatures presented in this paper.

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