1. CO as a Precursor of Ozone and a Tracer of Transport: Evidence from MOPITT Data
J. Kar (UT), H. Bremer (UB), James R. Drummond (UT), F. Nichitiu (UT), J. Zou (UT), J. Liu (UT), Y. Rochon (MSC), J. C. Gille (NCAR), M. N. Deeter(NCAR), G. Francis (NCAR), D. Ziskin (NCAR), J. Warner (NCAR)

2. Carbon Monoxide (CO) Tracer of Precursor of Transport ( ~ few mths)
Ozone
Sink of OH
Use MOPITT CO data to address:
Correlation between CO and O3 in the context of biomass
burning in the tropics (Delineate the causes of ozone variation)
Signature of transport phenomena (Convection, STE?!)

3. MOPITT measures upwelling radiation by gas
correlation radiometry in thermal IR near 4.7 m
and reflected solar radiation near 2.3 m
CO mixing ratio profiles and total columns are retrieved
by Optimal Estimation Technique. Mixing ratios reported at
surface, 850, 700,500,350,250,150 hPa
a Priori  Single and constant over time (variations in
retrievals reflect geophysical variations).
Retrievals on different levels are not independent 
Averaging Kernel (Vertical resolution)
Validation of MOPITT data– MOPITT CO biased by < 8%

5. MOPITT CO and SHADOZ Ozone Profiles at Natal

6. Comparison of MOPITT CO and MODIS Aerosols

7. Comparison of MOPITT CO and SHADOZ Ozone

8. Bremer et al.,2004
JGR (In press)

9. Fire Data From ATSR for MAM, 2001

10. 10 Year Climatology of 10 day Back Trajectories
Courtesy: Sam Oltmans

11. Convection Signature in MOPITT CO Data Near Calcutta(22.3N, 88.2E)

12. Back Trajectories, OLR and SST
Indicate Convective Activity

13. Locations of CO Profiles with Possible Signature of Convection(2002)x x
30-50 x x
Pressure(hPa) x x
CO m.r.(ppbv)

14. STE as seen in MOPITT CO Data near Wallops Island (37.8N, 75.5W)

16. Conclusions:
Distinct seasonal patterns of CO at several SHADOZ
stations indicate strong influence of African and South
American biomass burning.
Enhanced CO columns are consistent with corresponding
enhancement in tropospheric ozone content from sonde
data except at San Cristobal and Paramaribo.
Signatures of Convection and Stratosphere Troposphere
Exchange events can be detected in MOPITT CO data.
Zonal mean height latitude cross sections of CO indicate
convective transport in the southern tropics, possible
signature of downward branch of Hadley cell (NH) and a
seasonal migration of the boundary between the polluted
northern hemisphere and relatively clean southern
hemisphere.