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Xun Jiang 1 , David Crisp 2 , Edward Olsen 2 , Susan Kulawik 2 , Charles Miller 2 , and Yuk Yung 3

Investigation of CO 2 Variability From Different Satellite Retrievals. Xun Jiang 1 , David Crisp 2 , Edward Olsen 2 , Susan Kulawik 2 , Charles Miller 2 , and Yuk Yung 3. 1 Department of Earth & Atmospheric Sciences, Univ. of Houston 2 Science Division, Jet Propulsion Laboratory, Caltech

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Xun Jiang 1 , David Crisp 2 , Edward Olsen 2 , Susan Kulawik 2 , Charles Miller 2 , and Yuk Yung 3

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  1. Investigation of CO2 Variability From Different Satellite Retrievals Xun Jiang1, David Crisp2,Edward Olsen2, Susan Kulawik2, Charles Miller2, and Yuk Yung3 1 Department of Earth & Atmospheric Sciences, Univ. of Houston 2 Science Division, Jet Propulsion Laboratory, Caltech 3 Division of Geological & Planetary Sciences, Caltech OCO-2/ACOS Science Team Meeting, Feb 16-17, 2012 1

  2. Overview • Motivation • Data • Comparisons Between Satellite CO2 with In-situ Observations • Variability of CO2 (Seasonal Cycle & ENSO) • Conclusions 2

  3. Motivation • Improve understanding of CO2 variability and its effect on the global climate change using satellite data • Investigate how natural variability (e.g., ENSO) influence the CO2 • Improve CO2 simulations from chemistry-transport models in the future 3 3

  4. Data • Satellite CO2 Retrievals • 1. ACOS/Greenhouse gases Observing SATellite (GOSAT) V2.9 Column CO2 [Crisp et al., 2011; Wunch et al., 2011; O’Dell et al., 2011] • Period: Apr 2009 - Present • 2. Tropospheric Emission Spectrometer (TES) Mid-tropospheric CO2 [Kulawik et al., 2011] • Period: Jan 2006 – Present; Sensitivity Peak: 511 hPa • 3. Atmospheric Infrared Sounder (AIRS) V5 Mid-tropospheric CO2 [Chahine et al., 2005; 2008] • Period: Sep 2002 – Present; Sensitivity Peak: 500-300 hPa • In-situ CO2 Data • 1. NOAA ESRL Cooperative Air Sampling Network Surface CO2 [GLOBALVIEW-CO2, 2010] • 2. TCCON Column CO2 measured by Fourier Transform Spectrometer [Washenfelder et al., 2006; Macatangay et al., 2008] 4

  5. GOSAT Column CO2 in April 2009

  6. Comparison Between Satellite CO2 with In-situ Observations CO2 in April 2009 GOSAT column CO2 AIRS mid-tropospheric CO2; TES lower mid-tropospheric CO2 NOAA ESRL Surface CO2 TCCON column CO2

  7. Comparison Between Satellite CO2 with In-situ Observations Apr 2009 Jan 2010 Oct 2009 Jul 2009 GOSAT column CO2 AIRS mid-tropospheric CO2; TES lower mid-tropospheric CO2 NOAA ESRL Surface CO2; TCCON column CO2

  8. Comparison Between Satellite CO2 with In-situ Observations 24° N Equator 24° S GOSAT column CO2 AIRS mid-tropospheric CO2; TES lower mid-tropospheric CO2 NOAA ESRL Surface CO2

  9. CO2 Seasonal Cycle GOSAT column CO2 AIRS mid-tropospheric CO2; NOAA ESRL Surface CO2; TCCON column CO2

  10. Influences of El Niño on Mid-Trop CO2 El Niño La Niña El Niño– La Niña There is more (less) AIRS mid-tropospheric CO2 in the Central Pacific and less (more) mid-tropospheric CO2 in the Western Pacific during El Nino (La Nina) events. [Jiang et al., 2010]

  11. Influences of El Niño on Mid-Trop CO2 Raw Data Cor: 0.62 Lowpass Data Cor: 0.94 CO2 difference between the Central Pacific (190E-240E; 18S-18N) and the Western Pacific (110E-160E, 18S-18N) (solid lines) GOSAT column CO2 AIRS mid-tropospheric CO2; TES lower mid-tropospheric CO2 Inverted SOI index

  12. Influences of El Niño on MOZART-2 Mid-Trop CO2 El Niño La Niña El Niño –La Niña Color: MOZART2 CO2; White Contour: ECMWF-Interim  (Pa/s) Similar results are seen in MOZART-2 mid-tropospheric CO2, although the amplitude and spatial pattern in the model is a little different compared with that in satellite CO2.

  13. Influences of El Niño on MOZART-2 Mid-Trop CO2 Raw Data Cor: 0.48 Lowpass Cor: 0.65 MOZART2 CO2; Inverted SOI index

  14. Conclusions • Zonal averaged CO2 for three satellite data sets (GOSAT , AIRS, and TES) are consistent with the surface and TCCON column CO2 data. CO2 seasonal cycle amplitudes are larger in the northern hemisphere than that in the southern hemisphere. • During El Niño year, there is more CO2 in the central Pacific and less CO2 in the western Pacific. CO2 difference between the Central and Western Pacific oceans correlates well with the inverted SOI. • Similar ENSO results are seen in MOZART-2 mid-tropospheric CO2, although the amplitude and spatial pattern in the model is a little different compared with that in satellite CO2.

  15. Thank you! 15

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