Aura Microwave Limb Sounder Upper Stratospheric/Lower Mesospheric (USLM) Carbon Monoxide Observations in Arctic Winter 2009-2010: Analysis of An Anomalous Mixing Event

Details Aura Microwave Limb Sounder Upper Stratospheric/Lower Mesospheric (USLM) Carbon Monoxide Observations in Arctic Winter 2009-2010: Analysis of An Anomalous Mixing Event Aura Microwave Limb Sounder Upper Stratospheric/Lower Mesospheric (USLM) Carbon Monoxide Observations in Arctic Winter 2009-2010: Analysis of An Anomalous Mixing Event

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31b1731m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA31B-1731

Computer Science

Sound

[0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry, [0341] Atmospheric Composition And Structure / Middle Atmosphere: Constituent Transport And Chemistry, [3334] Atmospheric Processes / Middle Atmosphere Dynamics, [3360] Atmospheric Processes / Remote Sensing

Scientific paper

The 2009--2010 Arctic winter was notable for a strong, prolonged stratospheric sudden warming (SSW) beginning in late January; this SSW disrupted the stratospheric circulation to a degree similar to that of the 2006 and 2009 SSWs, but had a smaller impact on the mesospheric circulation. Prior to the 2010 SSW, trace gas fields from Aura Microwave Limb Sounder (MLS) observations show the signature of an unusual event suggesting a large intrusion of air from outside the vortex mixed into the vortex region, with the signature of this event subsequently propagating downwards via diabatic descent. A SLIMCAT chemistry transport model simulation captures this anomalous mixing event. Carbon monoxide (CO) is an especially useful tracer of air motions in the upper stratosphere/lower mesosphere (USLM). We analyse MLS and SLIMCAT CO fields, supported by examination of other trace gas data, to provide an overview of transport during the 2009-2010 winter, focusing on detailed analysis of the unusual USLM mixing event.

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