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Dynamical perspective on the middle atmosphere research in Sweden

Dynamical perspective on the middle atmosphere research in Sweden. 2010-03-24, SRS-Meeting, Stockholm Heiner Körnich, MISU heiner@misu.su.se. Overview. The middle atmosphere Impact direction? Research areas Outlook Summary. By Mark R. Schoeberl.

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Dynamical perspective on the middle atmosphere research in Sweden

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  1. Dynamical perspective on the middle atmosphere research in Sweden 2010-03-24, SRS-Meeting, Stockholm Heiner Körnich, MISU heiner@misu.su.se

  2. Overview The middle atmosphere Impact direction? Research areas Outlook Summary

  3. By Mark R. Schoeberl

  4. Dynamical influence goesBottom-up Top-down Middle atmosphere Climate system + Troposphere Local instability “Downward propagation”? Planetary, gravity and tidal waves

  5. Downward propagation of the zonal wind at 60ºN m/s 60 50 40 30 20 10 0 -10 -20 Pressure (hPa) NCEP reanalysis

  6. Downward propagation of the zonal wind at 60ºN drag m/s 60 50 40 30 20 10 0 -10 -20 Pressure (hPa) NCEP reanalysis

  7. Downward propagation of the zonal wind at 60ºN m/s drag 60 50 40 30 20 10 0 -10 -20 Pressure (hPa) NCEP reanalysis

  8. Downward propagation of the zonal wind at 60ºN m/s 60 50 40 30 20 10 0 -10 -20 drag Pressure (hPa) NCEP reanalysis

  9. Noctilucent clouds are very sensitive By Mark R. Schoeberl

  10. Photo by Nathan Wilhelm

  11. Photo by Nathan Wilhelm

  12. NLC properties observed by Odin • Sweden, France, Finland, Canada • launched on February 20, 2001 • 250 kg • sun-synchronous near-polar orbit at ~600 km altitude • 2 instruments: - Sub-mm / mm Radiometer (SMR) - Optical Spectrograph and InfraRed Imaging System (OSIRIS) Photo by Nathan Wilhelm

  13. NLC radii from Odin

  14. Polar winter stratosphere temperatureas planetary wave activity proxy

  15. Polar winter stratosphere temperatureas planetary wave activity proxy NLC radii from Odin VS. After Karlsson et al. (GRL 2007) Signals are on the opposite side of globe!

  16. Interhemispheric coupling – The essential modelTemperature response (shaded) and control mean (contours) NLC ∝- ΔT Körnich and Becker (ASR 2010) -20 -10 -5 -2 -1 1 2 5 10 20

  17. Interhemispheric coupling – The essential modelTemperature response (shaded) and control mean (contours) Change in circulation and NLC Feedback between mean flow and gravity waves Change in the mean flow Körnich and Becker (ASR 2010) Planetary waves in winter tropo-stratosphere. -20 -10 -5 -2 -1 1 2 5 10 20

  18. No interhemispheric coupling- because no gravity waves in the Summer hemisphere Change in the mean flow Körnich and Becker (ASR 2010) Planetary waves in winter tropo-stratosphere. -20 -10 -5 -2 -1 1 2 5 10 20

  19. Northern and southern winter stratosphere as seen by Odin (c) Chalmers

  20. Height of the summer mesopauseKirkwood et al. (GRL 2008) Polar mesosphere summer echos (PMSE) is a proxy for the mesopause height On southern hemishpere more variable Southern hemisphere summer mesopause 2007/2008 unusually high Interhemispheric coupling helps to explain these observations.

  21. Annual cycle in H2O observed by Odin Lossow et al. (JGR 2009)

  22. Annual cycle in H2O observed by Odin Difference in transport circulation through interhemispheric coupling Lossow et al. (JGR 2009)

  23. Probing the stratospheric transport By Mark R. Schoeberl

  24. Stratospheric Age of Air  Stratospheric age: time from entry in the tropics to any point New method: Using water isotopologues observed by Odin combined with a transport model Sanchez et al. (to be submitted to ACP 2010)

  25. Descent observed by OdinUrban et al. (ACP 2009), Orsolini et al. (ACP 2009) Potential temperature

  26. Tracer-tracer correlations by OdinKhosrawi et al. (ACP 2009) • Includes both transport and chemistry • Diabatic descent in Ozone and N2O • Important benchmark for chemical climate models

  27. Mesospheric instability By Mark R. Schoeberl

  28. Summer mesospheric 2 and 5-day wave Belova et al. (AG 2008) Belova et al. (AG 2008)

  29. Summer mesospheric 2 and 5-day wave Local instability could yield Top-down influence? Belova et al. (AG 2008)

  30. By Mark R. Schoeberl

  31. Measuring winds in the stratosphere By Mark R. Schoeberl

  32. Atmospheric Dynamics Mission ADM - Aeolus

  33. Tropopause as key region - Research with PREMIER PREMIER: Process Exploration through Measurements of Infrared and Millimetre-wave Emitted Radiation By Mark R. Schoeberl

  34. Summary Wag the tail: Interhemispheric coupling Stratospheric transport Wag the dog: 2 and 5-day waves? Combining observational data with dynamical models yields a more complete picture of the atmospheric circulation.

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