A Link between Tropical A Link between Tropical Intraseasonal Variability and Intraseasonal Variability and
Arctic Stratospheric OArctic Stratospheric O33
Yuk L. Yung1, K.-F. Li1, B. Tian2, K.-K. Tung3,L. Kuai2, and J. R. Worden2
1 California Institute of Technology2 Jet Propulsion Laboratory3 University of Washington
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Aura Meeting 1-3 Oct 2012, PasadenaAura Meeting 1-3 Oct 2012, Pasadena
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.
Outline
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The Madden-Julian oscillation Motivation: air quality forecast Aura O3 data: MLS, TES, TOMS MJO-modulations in global O3
What more from Aura?
Outline
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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
Madden & Julian [1971; 1972], Lau and Waliser [2005], Zhang [2005]
Madden-Julian oscillation
4
mm/day
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
Impacts on tracers: Motivation
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TES OMI
MLS + TES Troposphere to stratosphere
OMI Total column
HIRDLS Like MLS, not used here
O3 coverage by Aura
O3: More than tropics
7Li et al. [2012]
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(c) TOMS + OMI
Consistency between Aura Measurements
Li et al. [2012] Tian et al. [2006]
MJO Teleconnection of Polar O3
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Same patterns from MLS, TES and OMI
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MJO Teleconnection from Aura measurements
Connection to Lower Stratosphere
Rui and Wang [1990].
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Rossby wavesArctic
Teleconnection
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Tropopause height
+O3
+NO2 (OMI)+O3 (TES)
+CO2
+CO2
+w
+H2O (MLS, TES)
–CO
+CO (MLS, TES)
What else can Aura provide us?
Red: Under investigation
Summary
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Possible operational air quality forecasts on intraseasonal timescales
Subtle effects revealed from MJO modulation in chemical tracers O3 and tropopause motions
Assimilation/Modeling needed
Thank you!
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YL Yung ([email protected]) Aura Meeting 2012 Oct 3, 2012
Real-time Multivariate MJO (RMM) index
Defined from OLR data
The phase space of (RMM1, RMM2) characterizes the MJO phase number
RMM Phase Space
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
