1. Global Distribution of the Ozone-CO Correlation from TES and Comparison to the GEOS-CHEM Model
Lin Zhang, Daniel J. Jacob, Jennifer A. Logan, Solene Turquety, Kevin Bowman (JPL), Qinbin Li (JPL), Helen Worden (JPL)
AGU Fall
Dec 9, 2005

2. O3-CO correlation: Indicator of ozone production
Parrish et al., JGR1998
Black: observed
Red: GEOS-Chem
Li et al., JGR2002
Ozone-CO correlations in surface and aircraft data have been used to test understanding of ozone production but the data are sparse.
TES observations offer for the first time a global continuous data set of ozone-CO correlations to test model ozone budgets.

3. O3 and CO at 618 hPa in July 2005 TES vs
O3 and CO at 618 hPa in July TES vs. GEOS-Chem (with averaging kernels)
CO at 618 hpa
O3 at 618 hpa
TES
July 2005,
14 global surveys
GEOS-Chem
3-D CTM, 2 x2.5 resolution,
coupled oxidant-aerosol simulation driven by GEOS-4 assimilated meteorological fields

4. Deriving O3-CO correlations from TES data
July 2005, 618 hpa
RMA Slope: 0.86±0.21
R: 0.56
RMA Slope: 0.68±0.22
R: 0.66
Divide the globe into 10ox10o cells
In each cell, calculate the O3-CO correlation and regression coefficients for each month. Each cell has data points for July 2005.
TES and GEOS-Chem profiles are reprocessed using an invariant a priori.

5. Global distribution of the O3-CO correlation
(July 2005, 618 hpa)
ΔO3/ΔCO
Correlation coeff. R
TES
GEOS-Chem with TES AK
GEOS-Chem

6. Effect of measurement error on O3-CO correlations
Apply TES measurement errors to the model field:
ΔO3/ΔCO
Correlation coeff. R
TES
GEOS-Chem with TES AK and measurement error
GEOS-Chem simulated O3-CO correlation agree well with TES observed after accounting for the measurement errors!

7. TES vs. GEOS-Chem scatterplots over selected regions
Southeastern U.S.
Slope: 0.73
R: 0.39
Slope: 0.67
R: 0.80
East Asia
South Africa
Slope: 0.63
R: 0.55
Slope: 0.70
R: 0.56
Slope: 0.52
R: 0.79
Slope: 0.88
R: 0.75
+ TES O GEOS-Chem with TES AK

8. O3–CO correlation: contribution from anthropogenic emissions and biomass burning
(July 2005, 618 hpa)
ΔO3/ΔCO
Correlation coeff. R
GEOS-Chem standard simulation
Sensitivity simulation with anthro. and biomass emissions shut off

9. Thank you for your attention!