On recent interannual variability of the Arctic winter mesosphere: Implications for tracer descent

Details On recent interannual variability of the Arctic winter mesosphere: Implications for tracer descent On recent interannual variability of the Arctic winter mesosphere: Implications for tracer descent

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3409806s&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 9, CiteID L09806

Computer Science

Sound

43

Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Composition And Structure: Middle Atmosphere: Constituent Transport And Chemistry (3334), Atmospheric Processes: Mesospheric Dynamics

Scientific paper

Observations from the Sounding of the Atmosphere with Broadband Emission Radiometry (SABER) experiment on the NASA/Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite show an unusual vertical displacement of the winter Arctic stratopause in 2006 with zonal mean temperatures at 0.01 hPa (~78 km) exceeding 250 K. By contrast, at the conventional stratopause location near 0.7 hPa (~50 km), temperatures were unusually cold. Simulations with the NOGAPS-ALPHA model suggest that these are coupled to an unusually warm and disturbed lower stratosphere that filtered out many of the gravity waves that normally break at and above 50 km. The model also shows that downward transport in the 2006 Arctic vortex was enhanced relative to 2005. These results might explain observations of enhanced upper atmospheric NO descending to the upper stratosphere in 2006 and highlights the importance of gravity waves in modulating the coupling of the upper atmosphere with the stratosphere.

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