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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Wave mixing effects on minor chemical constituents in the MLT-region: Results from a global CTM driven by high-resolution dynamics Grygalashvyly Mykhaylo , Becker Erich , Sonnemann Gerd Leibniz-Institute of Atmospheric Physics e.V. at the University Rostock The dynamical fields a high-resolution mechanistic general circulation model (GCM) with resolved gravity waves are used to drive a chemistry-transport model (CTM) of the mesosphere/lower thermosphere (MLT). Both models have been used in previous studies. Here, they are coupled in off-line mode in order to study the explicit effects of gravity waves on the transport and photo-chemistry of minor constituents of the MLT. This is done on the basis of sensitivity experiments. In our control simulation the CTM is driven with the full dynamical fields from an annual cycle simulation with the GCM, where mid-frequency GWs down to horizontal wave lengths of 350 km are resolved and their wave-mean flow interaction is self-consistently induced by an advanced turbulence model. A perturbation simulation with the CTM is defined by eliminating all mesoscale variations with horizontal wavelengths shorter than 1000 km from the dynamical fields by means of spectral filtering before running the CTM. This means, both CTM-simulations are driven by the same large-scale dynamics. For reasons of consistency, we apply the same numerical grid and time step in both CTM simulations. The response of the CTM to gravity wave perturbations reveals strong effects on the trace-gas concentrations. In particular, minor chemical constituents with large photochemical life-time are strongly affected by vertical wave mixing, while constituents with short life-time reflect the dependence of their reaction rates on meso-scale temperature perturbations and on the changed distribution of long-living constituents. The mean model response varies with latitude and season, but is strongest around the mesopause. We present detailed discussions of the simulated gravity waves on the photo chemistry and highlight the consequences for our understanding of the general circulation of the MLT.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Study of 5577Å and 6300Å emissions by simultaneous measurements during substorms Guineva Veneta 1 , Despirak Irina 2 , Trøndsen Espen 3 , Werner Rolf 1 1 Solar-Terrestrial Influences Institute, BAS, 2 Polar Geophysical Institute, RAS, 3 University of Oslo The behaviour of the auroral emissions 5577Å and 6300Å and the ratio I6300/I5577 during substorms occurred at the time of recurrent streams (RS) at different latitudes has been examined. The development of the substorm bulge is followed up. The variations of the emissions during the substorm movement towards North, at the polar edge of the auroral bulge and inside it have been studied. For the study, simultaneous measurements from the All-Sky Imagers at Andøya Rocket Range (ARR), Andenes, Norway, at Longyearbyen and New Alezund, Svalbard have been used. Additional data concerning the solar wind parameters, IMF and the magnetic field are used from WIND satellite and the IMAGE magnetometer network to determine the recurrent streams, the substorms onsets and their further development. Data access has been provided under the Project “ALOMAR eARI” (RITA-CT-2003- 506208), Andenes, Norway. This Project received research funding from the European Community’s 6 th Framework Program.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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