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

CO2 Weather

July 2003

Chahine [GRL, 2008]

SUDDEN STRATOSPHERIC WARMING AND POLAR CO2 AND O3

AIRS CO2 increases while O3 decreases following a SSW event.

Jiang [JAS, submitted]

SUDDEN STRATOSPHERIC WARMING cont’d

Before After

CO2

O3

MATSUEDA AIRBORNE FLASK CO2 MEASUREMENTS

JAL flights(every

two weeks)

GEOS-Chem SIMULATIONOF UPPER TROP. CO2

Jiang [GBC, 2008]

— GEOS-Chem 3D (CMDL BC) — GEOS-Chem 3D (Source/Sink)— CJCTM 2D (CMDL BC) — MOZART2 (CMDL BC)

7

— GEOS-Chem 3D (CMDL BC) — GEOS-Chem 3D (Source/Sink)— CJCTM 2D (CMDL BC) — MOZART2 (CMDL BC)

(DETRENDED) SEASONAL CYCLE OF UPPER TROP. CO2

8

GC S/S

GC CMDL

MOZART

2-D CTM

SEASONAL CYCLE AMPLITUDE OF UPPER TROP. CO2

6-month signal not included

6-month signal included

SEMI-ANNUAL CYCLE IN UPPER TROPOSPHERIC CO2?

2-D CTM CO2 @ 35°N

SEMI-ANNUAL CYCLE: GEOS-Chem RESULTS