1. WHAT CAN WE LEARN ABOUT UPPER TROPOSPHERIC CO2?
Xun Jiang1,2, Qinbin Li1,3, Moustafa Chahine1, Luke Chen1, Edward Olsen1
Paul Dimotakis1, Yuk Yung4, Jim Randerson5
1JPL 2Univ. Houston 3UCLA 4Caltech 5UCI
The 4th GEOS-Chem Meeting, 4/8/09, Harvard

2. CO2 Weather
July 2003
Chahine [GRL, 2008]

3. SUDDEN STRATOSPHERIC WARMING AND POLAR CO2 AND O3
AIRS CO2 increases while O3 decreases following a SSW event.
Jiang [JAS, submitted]

4. SUDDEN STRATOSPHERIC WARMING cont’d
Before
After
CO2 O3

5. MATSUEDA AIRBORNE FLASK CO2 MEASUREMENTS
JAL flights
(every two weeks)

6. GEOS-Chem SIMULATION OF UPPER TROP. CO2 Jiang [GBC, 2008]
— GEOS-Chem 3D (CMDL BC)
— GEOS-Chem 3D (Source/Sink)
— CJCTM 2D (CMDL BC)
— MOZART2 (CMDL BC)
Jiang [GBC, 2008]

7. (DETRENDED) SEASONAL CYCLE OF UPPER TROP. CO2 — GEOS-Chem 3D (CMDL BC)
— GEOS-Chem 3D (Source/Sink)
— CJCTM 2D (CMDL BC)
— MOZART2 (CMDL BC)

8. SEASONAL CYCLE AMPLITUDE OF UPPER TROP. CO2
2-D CTM
MOZART
GC CMDL
GC S/S

9. SEMI-ANNUAL CYCLE IN UPPER TROPOSPHERIC CO2?
6-month signal not included
2-D CTM 35°N
6-month signal included

10. SEMI-ANNUAL CYCLE: GEOS-Chem RESULTS