remote sensing of co 2 in the upper troposphere by the atmospheric infrared sounder

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National Aeronautics and Space Administration

Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadena, California

Atmospheric Infrared Sounder

Remote Sensing of CO2 in the Upper Troposphere by the Atmospheric Infrared

Sounder

Jet Propulsion Laboratory

California Institute of Technology

12/10/2007

Xun Jiang, Moustafa T. Chahine, Qinbin Li, Edward T. Olsen, Luke Chen, M. Liang, R. Shia and Yuk Yung

(focus on high-latitude)

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Atmospheric Infrared Sounder Overview

Motivation

Validation of AIRS CO2

Stratospheric Sudden Warming: Influence on CO2 and O3

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Atmospheric Infrared Sounder Motivation

Improve the understanding of the global warming, large-scale dynamics and stratosphere-troposphere interactions

Offer a unique opportunity to validate and improve the vertical transport in the models

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Atmospheric Infrared Sounder Data

AIRS CO2 and O3

Aircraft Data of CO2 from Matsueda et al. [2002], Climate Monitoring & Diagnostics Laboratory (CMDL), and SPURT Aircraft [Hoor et al., 2004]

Ozonesonde data from World Ozone and Ultraviolet Data (WOUDC)

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Comparison Between AIRS CO2 with Matsueda Aircraft Data

CO2 retrieved by Vanishing Partial Derivatives (VPD)M. Chahine, C. Barnet, E.T. Olsen, L. Chen, and E. Maddy [2005, GRL]

SD: -1.14 ± 1.44 ppmv

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Comparison Between AIRS CO2 with Aircraft Data in High Latitude

Dots: Aircraft CO2 weighted by AIRS weighting function Contour: NCEP2 GPH at 500 hPa; Vector: NCEP2 wind vector at 500 hPaCourtesy of Peter Hoor for SPURT CO2 [Hoor et al., 2004] and Dr. Michada for

CO2 at 55N, 83E

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Comparison Between AIRS CO2 with SPURT Aircraft Data

SD: -0.9 ± 1.33 ppmv

Dots: Aircraft CO2 weighted by AIRS weighting function Contour: NCEP2 GPH at 500 hPa; Vector: NCEP2 wind vector at 500 hPa

Version 5 VPD AIRS CO2

● Matsueda CO2 aircraft data

● CMDL CO2 aircraft data ● Michada CO2 aircraft data ● SPURT CO2 aircraft data—— Version 5 AIRS CO2

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

Version 5 VPD AIRS O3

● Ozonesonde Data

—— Version 5 AIRS O3

—— Count of Clusters—— CJCTM 2D—— GEOS-Chem 3D—— J. Logan O3 Climatology

Stratospheric Sudden Warming

Strongest dynamical coupling in the stratosphere-troposphere system

It has important influence on the chemical tracers

Stratospheric Major Warming: averaged 60-80ºN zonal mean winds and 60ºN zonal mean wind reverse sign

[Decrease of vortex area; Less downwelling in the polar region]

Influence of Sudden Stratospheric Warming on CO2 and O3 AIRS- April 2003

AIRS retrieved upper tropospheric CO2 increases while AIRS 300 mb O3 decreases following a sudden stratospheric warming event

40 ppbv

—— AIRS Retrieved CO2 —— AIRS Retrieved O3

—— Zonal Wind at 60N-80N - - - AIRS Temperature at 50N-90N

April 1 April 30

40 ppbv

- - - Model CO2 - - - Model O3

April 1 April 30

Influence of Sudden Stratospheric Warming on CO2 and O3 AIRS- April 2003

AIRS retrieved upper tropospheric CO2 increases while AIRS 300 mb O3 decreases following a sudden stratospheric warming event

—— AIRS Retrieved CO2 —— AIRS Retrieved O3

—— Zonal Wind at 60N-80N - - - AIRS Temperature at 50N-90N

Before SSW After SSW

CO2

O3

Contour: NCEP2 GPH at 500 hPa

AIRS CO2 (Apr 2003) AIRS O3 (Apr 2003)

QuickTime™ and a decompressor

are needed to see this picture.

QuickTime™ and a decompressor

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Conclusions

With AIRS, we monitor the distribution and transport of global CO2 on a weekly basis for the first time.

The latitudinal distribution of AIRS retrievals of upper tropospheric CO2 agrees reasonably well with in situ aircraft observations of CO2 and model simulations.

AIRS retrieved upper tropospheric CO2 increases while AIRS 300 mb O3 decreases following a sudden stratospheric warming event.

Before SSW

After SSW

remote sensing of co 2 in the upper troposphere by the atmospheric infrared sounder

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