Investigation of major stratospheric warming effects on atmospheric coupling at high latitudes using the Canadian Middle Atmosphere Model

Details Investigation of major stratospheric warming effects on atmospheric coupling at high latitudes using the Canadian Middle Atmosphere Model Investigation of major stratospheric warming effects on atmospheric coupling at high latitudes using the Canadian Middle Atmosphere Model

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31a1717s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA31A-1717

Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [0350] Atmospheric Composition And Structure / Pressure, Density, And Temperature

Scientific paper

The study examines the response of the mesosphere/lower thermosphere to the major stratospheric warming (SSW) event from January 2009, as seen in the OH and O2 (0,1) Atmospheric band airglow observations nominally at 87 km and 94 km, respectively by a SATI (Spectral Airglow Temperature Imager) instrument installed at the Polar Environment Atmospheric Research Laboratory (PEARL) at Eureka (80°N, 86°W) as part of the Canadian Network for the Detection of Atmospheric Change. At the time of the SSW the airglow emissions and the derived rotational temperatures appear depleted and decreased, respectively followed by an enhancement of the airglow emission rates during the SSW recovery phase, while the temperatures returned to their pre-event state. An empirical relationship between OH airglow peak altitude determined by SABER and SATI integrated emission rates allowed perturbed OH and O2 (0,1) airglow altitudes to be assigned to the SATI observations. From these the O volume mixing ratio (VMR), corresponding to the observed OH and O2 (0,1) airglow emission rates were modeled. Atomic oxygen depletion by a factor of ~5 was observed during the SSW and lasted for about 5 days. During the SSW recovery phase the O VMR giving rise to the observed O2 (0,1) airglow emission rates increased by a factor of 3.5 from its pre-SSW level and 17 times from that observed during the peak of the SSW. The observed response of the MLT region to the major stratospheric warming is further examined employing assimilated temperature and wind fields by the extended Canadian Middle Atmosphere Model (CMAM) at high latitudes and throughout the middle atmosphere from 10 to 100 km height. Temperature observations by the COSMIC/Formosat-3 and MLS-Aura satellites are also considered in this study.

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