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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Winter mesopause dynamics observed in airglow emission rates and temperatures at Resolute, 74 N. Shepherd Gordon , Cho Young-Min CRESS - York University Airglow emission rates and rotational temperatures have been observed for the OH Meinel (6,2) band and the O2 Atmospheric (0,1) band for eight winters at Resolute, 74 N, in Northern Canada, using a Spectral Airglow Temperature Imager (SATI). The winter dynamics at the mesopause are dominated by the downwelling associated with the large-scale circulation that keeps the mesopause region warm in winter. However, this downwelling is modulated by extreme variations during 1) short-term variations such as mesospheric coolings, 2) variations over the course of the winter and 3) variations from winter to winter. These variations, on all time scales, show strong positive correlation between the temperature and emission rate, consistent with adiabatic temperature increases arising from enhanced downwelling, and contemporaneous airglow enhancements through the transport of atomic oxygen from the oxygen-rich region above to the oxygen-poor region below. These mesospheric (OH airglow) temperatures are compared with lower stratospheric temperatures obtained from radiosonde observations at the same location and a strong correlation is found for the westerly phase of the QBO. In addition, the OH rotational temperatures are correlated with the solar flux, but only during the westerly phase of the QBO. These results are reviewed and compared with other observations.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Coupling between the stratosphere, mesosphere and ionosphere during the major stratospheric warming of January 2009 Shepherd Marianna 1 , Alexander Simon 2 , Cho Young-Min 1 , Shepherd Gordon 1 1 Centre for Research in Earth and Space Science, York University, 2 Australian Antarctic Division Temperature and electron density data from the COSMIC GPS-RO satellite constellation together with temperatures from the MLS-Aura satellite in the Arctic are used to study the response of the mesosphere/ lower thermosphere (MLT) and ionosphere to changes in the stratosphere during the major sudden stratospheric warming (SSW) event from January 2009. Ground-based observations of hydroxyl and O2(0,1) Atmospheric band airglow emission rates and rotational temperatures are also considered. In the low to mid-stratosphere (15-40 km) eastward wave activity was significantly reduced during the early part of the 2008-09 winter and immediately prior to the major SSW. A westward wave with zonal wavenumber two, with distinct peaks at 22 km and 35 km and period of ~16-24 days, as well as a stationary wave two were associated with the 2009 major SSW. In the MLT region at the time of the SSW the airglow emissions and the temperatures appear depleted and decreased, followed by an enhancement of the airglow emission rates during the SSW recovery phase, while the temperatures returned to their pre-event state. The analysis has shown atomic oxygen depletion by a factor of ~ 5 during the SSW which lasted about 5 days. During the SSW recovery phase the atomic oxygen volume mixing ratio 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 the peak of the SSW. Perturbations in the OH and O2(0,1) airglow layers with periods of 4-, 6-, 8- and 12-h indicate nonlinear interaction between zonally symmetric semidiurnal tides and planetary waves. These perturbations are followed into the ionosphere and compared with the planetary wave signatures observed in the stratosphere and mesosphere examining the dynamical coupling between these atmospheric regions.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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