The role of MLT dynamics at mid and high latitudes on the Ionosphere/Thermosphere weather (DYNAMITE) Climatology of semidiurnal lunar and solar tides.

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The role of MLT dynamics at mid and high latitudes on the Ionosphere/Thermosphere weather (DYNAMITE) Climatology of semidiurnal lunar and solar tides at mid and high latitudes: interhemispheric comparison J. L. Chau, G. Stober, F.-J. Lübken, F. Conte, K. Baumgarten, et al. In collaboration with: D. Pokhotelov, F. Laskar, P. Hoffmann, N. Pedatella, … J. F. Conte, J. L. Chau, G. Stober, N. Pedatella, A. Maute, P. Hoffmann, D. Janches, D. Fritts, and D. Murphy SPP Colloquium 14.06.2017, Bremen

Main Goals Quantification of the gravity waves (GW) activity and their corresponding momentum flux in the MLT region with radar and lidar observations at mid and high latitudes. Investigation of the semidiurnal solar and lunar tides in the MLT region during sudden stratospheric warmings (SSW) and their relation to splitting and displacing stratospheric polar vortex events, using observations and simulations. Evaluation of the observed MLT solar and lunar tides during SSW and non-SSW events on the I/T weather, by comparing special WACCM-X – TIMEGCM simulations with satellite and ground-based I/T observations. SPP Colloquium 14.06.2017, Bremen

Kathrin Baumgarten (see Poster) T‘ (daily mean) - unfiltered Vert. filtered (λz< 15 km) Unfiltered data (i.e. GW plus tides) an vertically filtered data (i.e. mainly inertia GW) show a clear minimum during summer Temporally filtered ( < 8 h) Short periodic GWs do not show a large variation No clear annual variation in the temporally filtered data from Baumgarten et al. [2017] SPP Colloquium 14.06.2017, Bremen

Climatology of semidiurnal lunar and solar tides TIMEGCM/WACCM-X, 90 km (2009 SSW) SW2 M2 TIMEGCM/WACCM-X, 90 km (2013 SSW) 54N 54S M2 adapted from Pedatella et al. [2014] from Pedatella et al. [2017], submitted SPP Colloquium 14.06.2017, Bremen

Climatology of semidiurnal lunar and solar tides 2009-2013 composites of mean zonal (U) and meridional (V) winds, SW2 and M2 total magnitudes from Conte et al. [2017], under review SPP Colloquium 14.06.2017, Bremen

Climatology of semidiurnal lunar and solar tides The most active periods of the semidiurnal lunar and solar tides in the SH strongly depend on the geographical location. M2 shows stronger amplitudes during Summer, over Davis Winter, over Rio Grande Both, observations and simulations show an enhancement of M2 over Rio Grande during 2013 SSW time period. SPP Colloquium 14.06.2017, Bremen

Climatology of semidiurnal lunar and solar tides from Conte et al. [2017], under review SPP Colloquium 14.06.2017, Bremen

Dimitry Pokhotelov (see Poster) Mid-latitude semidiurnal tides Altitude, km A12 zonal, m/s Juliusruh meteor radar data Altitude, km A12 zonal, m/s KMCM simulations Altitude, km A12 zonal, m/s CESM-WACCM simulations SPP Colloquium 14.06.2017, Bremen

Semidiurnal solar tides during the fall transition SPP Colloquium 14.06.2017, Bremen En el HS no es claro el decrecimiento de SW2 durante ninguna de las dos transiciones. Al mirar el comportamiento de los vientos simulados por HAMMONIA (sin procesar), se puede apreciar una clara simetría entre ambas transiciones. En cambio, en le HN el comportamiento de los vientos no es tan simétrico (e/ las transiciones), destacándose un predominio de eastward wind en octubre, en la estratosfera; mientras que en marzo no es tan intenso el viento eastward. Además, en la mesosfera, en marzo, destaca viento meridional hacia el ecuador.

Semidiurnal solar tides during the fall transition HAMMONIA winds and temp. courtesy of H. Schmidt (MPI, Hamburg) SPP Colloquium 14.06.2017, Bremen En latitudes medias a altas del HN, durante abril/mayo hay una fuerte variabilidad en la concentración del ozono (que es el principal responsible de la formación de SW2). Esto no se ve en septiembre/octubre (ver paper de Smyshlyaev, University of Saint Petersburg).

Thank you! References Baumgarten, K., M. Gerding, and F.-J. Lübken (2017), Seasonal variation of gravity wave parameters using different filter methods with daylight lidar measurements at midlatitudes, J. Geophysics. Res. Atmos., 122, 2683–2695, doi:10.1002/2016JD025916. Chau, J. L., P. Hoffmann, N. M. Pedatella, V. Matthias, and G. Stober (2015), Upper mesospheric lunar tides over middle and high latitudes during sudden stratospheric warming events, J. Geophysics. Res. Space Physics, 120, doi:10.1002/2015JA020998. Conte, J. F., C. Brunini (2017), Ingestion of FORMOSAT-3/COSMIC GPS data into La Plata Ionospheric Model: a preliminary assessment, Adv. Spa. Res., https://doi.org/10.1016/j.asr.2017.04.025. Conte, J. F., J. L. Chau, G. Stober, N. Pedatella, A. Maute, P. Hoffmann, D. Janches, D. Frits, and D. Murphy (2017), Climatology of semidiurnal lunar and solar tides at mid and high latitudes: interhemispheric comparison, J. Geophysics. Res. Space Physics, Under review. Pedatella, N. M., H.-L. Liu, F. Sassi, J. Lei, J. L. Chau, and X. Zhang (2014), Ionosphere variability during the 2009 SSW: Influence of the lunar semidiurnal tide and mechanisms producing electron density variability, J. Geophys. Res. Space Physics, 119, 3828–3843, doi:10.1002/2014JA019849. Pedatella, N. M., J. L. Chau, H. Schmidt, L. P. Goncharenko, C. Stolle, K. Hocke, V. L. Harvey, B. Funke, and T. A. Siddiqui (2017), The Far-Flung Effects of Sudden Stratospheric Warmings, EOS, Submitted.