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A Link between Tropical Intraseasonal Variability and Arctic Stratospheric O 3

A Link between Tropical Intraseasonal Variability and Arctic Stratospheric O 3. Aura Meeting 1-3 Oct 2012, Pasadena. Yuk L. Yung 1 , K.-F. Li 1 , B. Tian 2 , K.-K. Tung 3 , L. Kuai 2 , and J. R. Worden 2 1 California Institute of Technology 2 Jet Propulsion Laboratory

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A Link between Tropical Intraseasonal Variability and Arctic Stratospheric O 3

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  1. A Link between Tropical Intraseasonal Variability and Arctic Stratospheric O3 Aura Meeting 1-3 Oct 2012, Pasadena Yuk L. Yung1, K.-F. Li1, B. Tian2, K.-K. Tung3,L. Kuai2, and J. R. Worden2 1 California Institute of Technology 2 Jet Propulsion Laboratory 3 University of Washington

  2. Outline • Li, K.-F., B. Tian, D. E.Waliser, M. J. Schwartz, J. L. Neu, J. R. Worden, and Y. L. Yung. (2012). “Vertical structure of MJO-related subtropical ozone variations from MLS, TES, and SHADOZ data”Atmos. Chem. Phys.,12 425–436. doi:10.5194/acp-12-425-2012 www.atmos-chem-phys.net/12/425/2012/ • King-Fai Li, Baijun Tian, Ka-Kit Tung, Le Kuai, John R. Worden, and Yuk L. Yung, A link between tropical intraseasonal variability and polar stratospheric ozone, submitted to J. Geophys. Res.

  3. Outline • The Madden-Julian oscillation • Motivation: air quality forecast • Aura O3 data: MLS, TES, TOMS • MJO-modulations in global O3 • What more from Aura?

  4. Madden-Julian oscillation Madden & Julian [1971; 1972], Lau and Waliser [2005], Zhang [2005] • Dominant form of intraseasonal variability in the tropics • Strongest during boreal winters • Slow (~5 m/s) eastward-propagating oscillations in tropical deep convection and large-scale circulation • Life cycle ~ 40–60 days mm/day

  5. Impacts on tracers: Motivation • Operational forecasts can now predicts weather 2 weeks ahead • Impacts of the MJO on the chemical components have only been realized recently • Advanced knowledge of air quality, e.g. Air Quality Index • Helpful for emergency control and release of early warnings to vulnerable

  6. O3 coverage by Aura • MLS + TES • Troposphere to stratosphere • OMI • Total column • HIRDLS • Like MLS, not used here TES OMI

  7. O3: More than tropics Li et al. [2012]

  8. Consistency between Aura Measurements (c) TOMS + OMI Li et al. [2012] Tian et al. [2006]

  9. MJO Teleconnection of Polar O3 • Same patterns from MLS, TES and OMI

  10. MJO Teleconnection from Aura measurements

  11. Connection to Lower Stratosphere Arctic Rossby waves Teleconnection Rui and Wang [1990].

  12. What else can Aura provide us? Tropopause height +O3 +H2O (MLS, TES) +NO2 (OMI) +O3 (TES) +CO2 –CO Red: Under investigation +w +CO (MLS, TES) +CO2

  13. Summary • Possible operational air quality forecasts on intraseasonal timescales • Subtle effects revealed from MJO modulation in chemical tracers • O3 and tropopause motions • Assimilation/Modeling needed

  14. Thank you!

  15. YL Yung (yly@gps.caltech.edu) Aura Meeting 2012 Oct 3, 2012

  16. RMM Phase Space • Real-time Multivariate MJO (RMM) index • Defined from OLR data • The phase space of (RMM1, RMM2) characterizes the MJO phase number

  17. MLS O3 • Microwave Limb Sounder (MLS) • Retrieved from 240 GHz O3 band • Swath products • Nov 2004 – Feb 2010 • Sensitivity from lower stratosphere to upper stratosphere

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