Global Distribution of CO2 in Mid Troposphere from Global Distribution of CO2 in Mid Troposphere from the Atmospheric Infrared Sounder (AIRS) the Atmospheric Infrared Sounder (AIRS) Measurements Reveal Cross Equator ExchangeMeasurements Reveal Cross Equator Exchange

Yuk L. YungYuk L. Yung1,*1,*, Run-Lie Shia, Run-Lie Shia11, Xun Jiang, Xun Jiang22, Mao-Chiang Liang, Mao-Chiang Liang33, , King-Fai LiKing-Fai Li11, Le Kuai, Le Kuai11, Charles E. Miller, Charles E. Miller44, Moustafa Chahine, Moustafa Chahine44, , Edward T. OlsenEdward T. Olsen44, Luke Chen, Luke Chen44

• Division of Geological and Planetary Sciences, California Institute of Technology, 150- 21 Division of Geological and Planetary Sciences, California Institute of Technology, 150- 21 Caltech, Pasadena, CA 91125Caltech, Pasadena, CA 91125

• Department of Earth and Atmospheric Sciences, University of Houston, The University of Department of Earth and Atmospheric Sciences, University of Houston, The University of Houston, 4800 Calhoun Rd., Houston, TX 77204Houston, 4800 Calhoun Rd., Houston, TX 77204

• Research Center for Environmental Changes, Academia Sinica, 128 Sec. 2, Academia Rd., Research Center for Environmental Changes, Academia Sinica, 128 Sec. 2, Academia Rd., Nankang, Taipei, 115, TaiwanNankang, Taipei, 115, Taiwan

• Science Division, Jet Propulsion Laboratory, California Institute of Technology, USA, Science Division, Jet Propulsion Laboratory, California Institute of Technology, USA, Science Division, Jet Propulsion Laboratory, Pasadena, CA 91109Science Division, Jet Propulsion Laboratory, Pasadena, CA 91109

Photo: Aqua/AIRS Global Carbon Dioxidehttp://svs.gsfc.nasa.gov/vis/a000000/a003400/a003440/index.html

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ModelsModels DataData TransportTransport

Shia, Liang, Miller, Yung, GRL 2006

Seasonal CyclesSeasonal Cycles

MozartMozart

MozartMozart

MozartMozart

MozartMozart

Mozart (3D)Mozart (3D) Boundary ConditionBoundary Condition

MozartMozart

MozartMozart

OutlineOutline

ModelsModels DataData TransportTransport

Chahine et al. 2008

Strow et al. 2007

OutlineOutline

ModelsModels DataData TransportTransport

Compare with Carbon TrackerCompare with Carbon Tracker

Green=NH, Red=SH, Black=FluxGreen=NH, Red=SH, Black=Flux

Fluxes from level 1 to 5Fluxes from level 1 to 5

Green=NH, Red=SH, Black=FluxGreen=NH, Red=SH, Black=Flux

SummarySummary

Data shows evidence for Data shows evidence for enhanced transportenhanced transport

Models shows COModels shows CO22 transport transport

in high tropospherein high troposphere Transport sensitive to KTransport sensitive to Kyy yy

(small scale processes)(small scale processes)

Backup SlidesBackup Slides

Table 1

Of the nearly 7 GT-C/yr net CO2 source created in N.H. 75% is transported into S.H. and 48% is absorbed by the surface of S.H.

Sensitivity Tests, 20% reduction of : Kyy => 10% decrease of the cross equator fluxKzz => 4%PSI => 1%

Distribution of S.H. sink 0-30 deg. S. 75% (source)30-60 deg. S. 30%60-90 deg. S. -5%

Strow et al. 2007

Chahine et al. 2008

Yung et al., CO2 Exchange Across the EquatorAIRS Science Team Meeting 2009