References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-9-4797-2009

First year of upper tropospheric integrated content of CO2 from IASI hyperspectral infrared observations

Crevoisier

¹ Chédin

¹ Matsueda

² Machida

³ Armante

¹ Scott

N. A.

Laboratoire de Météorologie Dynamique/CNRS/IPSL, Ecole Polytechnique, Palaiseau, France

Geochemical Research Department, Meteorological Research Institute, Tsukuba, Japan

Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Japan

21 07 2009

9 14 4797 4810

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Simultaneous observations from the Infrared Atmospheric Sounding Interferometer (IASI) and from the Advanced Microwave Sounding Unit (AMSU), launched together onboard the European MetOp platform in October 2006, are used to retrieve an upper tropospheric content of carbon dioxide (CO2) covering the range 11–15 km (100–300 hPa), in clear-sky conditions, in the tropics, over sea, for the first year of operation of MetOp (January 2008–December 2008). With its very high spectral resolution, IASI provides fourteen channels in the 15 μm band highly sensitive to CO2 with reduced sensitivities to other atmospheric variables. IASI observations, sensitive to both CO2 and temperature, are used in conjunction with AMSU observations, only sensitive to temperature, to decorrelate both signals through a non-linear inference scheme based on neural networks. A key point of this approach is that no use is made of prior information in terms of CO2 seasonality, trend, or geographical patterns. The precision of the retrieval is estimated to be about 2.0 ppmv (~0.5%) for a 5°×5° spatial resolution on a monthly time scale. Features of the retrieved CO2 space-time distribution include: (1) a strong seasonal cycle of 4 ppmv in the northern tropics with a maximum in June–July and a minimum in September–October. This cycle is characterized by a backward two-months lag as compared to the surface, by a backward one-month lag as compared to measurements performed at 11 km, and by a forward one-month lag as compared to observations performed at the tropopause (16 km). This is likely due to the time-lag of CO2 cycle while transported from the surface to the upper troposphere; (2) a more complex seasonal cycle in the southern tropics, in agreement with in-situ measurements; (3) a latitudinal variation of CO2 shifting from a South-to-North increase of 3.5 ppmv in boreal spring to a South-to-North decrease of 1.5 ppmv in the fall, in excellent agreement with tropospheric aircraft measurements; (4) signatures of CO2 emissions transported to the upper troposphere. In addition to bringing an improved view of CO2 distribution, these results from IASI should provide an additional means to observe and understand atmospheric transport pathways of CO2 from the surface to the upper troposphere.

References 1

Barbosa, P. M., Stroppiana, D., Grégoire, J. M., and Pereira, J. M. C.: An assessment of vegetation fire in Africa (1981–1991): Burned areas, burned biomass, and atmospheric emissions, Global Biogeochem. Cy., 13, 933–950, 1999.

Barkley, M. P., Monks, P. S., Hewitt, A. J., Machida, T., Desai, A., Vinnichenko, N., Nakazawa, T., Yu Arshinov, M., Fedoseev, N., and Watai, T.: Assessing the near surface sensitivity of SCIAMACHY atmospheric CO2 retrieved using (FSI) WFM-DOAS, Atmos. Chem. Phys., 7, 3597–3619, 2007.

Boering, K. A., Wofsy, S. C., Daube, B. C., Schneider, J. R., Loewenstein, M., Podolske, J. R., and Conway, T. J.: Stratospheric mean ages and transport rates from observations of CO2 and N2O , Science, 274, 1340–1343, 1996.

Buchwitz, M., de Beek, R., Burrows, J. P., Bovensmann, H., Warneke, T., Notholt, J., Meirink, J. F., Goede, A. P. H., Bergamaschi, P., Körner, S., Heimann, M., and Schulz, A.: Atmospheric methane and carbon dioxide from SCIAMACHY satellite data: initial comparison with chemistry and transport models, Atmos. Chem. Phys., 5, 941–962, 2005.

Cahoon, D. R., Stocks, B. J., Levine, J. S., Coter III, W. R., and O'Neill, C. P.: Seasonal distribution of African savanna fires, Nature, 359, 812–815, 1992.

Chahine, M. T., Barnet, C. D., Olsen, E. T., Chen, L., and Maddy, E.: On the determination of atmospheric minor gases by the method of vanishing partial derivatives with application to CO2, Geophys. Res. Lett., 32, L22803, doi:10.1029/2005GL024165, 2005.

Chahine M. T., Chen, L., Dimotakis, P., Jiang, X., Li, Q., Olsen, E. T., Pagano, T., Randerson, J., and Yung, Y. L.: Satellite remote sounding of mid-tropospheric CO2, Geophys. Res. Lett., 35, L17807, doi:10.1029/2008GL035022, 2008.

Chédin, A., Scott, N. A., Wahiche, C., and Moulinier, P.: The improved initialisation inversion method: A high resolution physical method for temperature retrievals from satellites of the TIROS-N series, J. Clim. Appl. Meteorol., 24, 128–143, 1985.

Chédin, A., Hollingsworth, A., Scott, N. A., Serrar, S., Crevoisier, C., and Armante, R.: Annual and seasonal variations of atmospheric CO2, N2O, and CO concentration retrieved from NOAA/TOVS satellite observations, Geophys. Res. Lett., 29(8), 1269, doi:10.1029/2001GL014082, 2002.

Chédin, A., Serrar, S., Scott, N. A., Crevoisier, C., and Armante, R.: First global measurement of mid-tropospheric CO2 from NOAA polar satellites: Tropical zone, J. Geophys. Res., 108(D18), 4581, doi:10.1029/2003JD003439, 2003.

Chédin, A., Scott, N. A., Armante, R., Pierangelo, C., Crevoisier, C., Fossé, O., and Ciais, P.: A quantitative link between CO2 emissions from tropical vegetation fires and the daily tropospheric excess (DTE) of CO2 seen by NOAA-10 (1987–1991), J. Geophys. Res., 113, D05302, doi:10.1029/2007JD008576, 2008.

Chevallier, F., Engelen, R. J., and Peylin, P.: The contribution of AIRS data to the estimation of CO2 sources and sinks, Geophys. Res. Lett., 32, L23801, doi:10.1029/2005GL024229, 2005.

Cooke, W., Koffi, B., and Grégoire, J. M.: Seasonality of vegetation fires in Africa from remote sensing data and application to a global chemistry model, J. Geophys. Res., 101, 21051–21065, 1996.

Crevoisier, C., Chédin, A., and Scott, N. A., AIRS channel selection for CO2 and other trace-gas retrievals, Q. J. Roy. Meteorol. Soc., 129, 2719–2740, 2003a.

Crevoisier, C., Chédin, A., Heilliette, S., Scott, N. A., Serrar, S., Armante, R.: Mid-tropospheric CO2 retrieval in the tropical zone from AIRS observations, Proceedings of the 13th International TOVS Study Conference, 2003b.

Crevoisier C., Heilliette, S., Chédin, A., Serrar, S., Armante, R., and Scott, N. A.: Midtropospheric CO2 concentration retrieval from AIRS observations in the tropics, Geophys. Res. Lett., 31, L17106, doi:10.1029/2004GL020141, 2004.

Crevoisier, C., Nobileau, D., Fiore, A. M., Armante, R., Chédin, A., and Scott, N. A.: A new insight on tropospheric methane in the Tropics – first year from IASI hyperspectral infrared observations, Atmos. Chem. Phys. Discuss., 9, 6855–6887, 2009.

Duncan, B. N., Martin, R. V., Staudt, A. C., Yevich, R., and Logan, J. A.: Interannual and seasonal variability of biomass burning emissions constrained by satellite observations, J. Geophys. Res., 108(D2), 4100, doi:10.1029/2002JD002378, 2003.

Engelen, R. J., Andersson, E., Chevallier, F., Hollingsworth, A., Matricardi, M., McNally, A. P., Thépaut, J.-N., and Watts, P. D.: Estimating atmospheric CO2 from advanced infrared satellite radiances within an operational four-dimensional variational (4D-Var) data assimilation system: Methodology and first results, J. Geophys. Res., 109, D19309, doi:10.1029/2004JD004777, 2004.

Engelen, R. J., and McNally, A. P.: Estimating atmospheric CO2 from advanced infrared satellite radiances within an operational fourdimensional variational (4D-Var) data assimilation system: Results and validation, J. Geophys. Res., 110, D18305, doi:10.1029/2005JD005982, 2005.

Engelen, R. J., Serrar, S., and Chevallier, F.: Four-dimensional data assimilation of atmospheric CO2 using AIRS observations, J. Geophys. Res., 114, D03303, doi:10.1029/2008JD010739, 2009.

GLOBALVIEW-CO2: Cooperative Atmospheric Data Integration Project – Carbon Dioxide. CD-ROM, NOAA ESRL, Boulder, Colorado (also available on Internet via anonymous FTP to ftp.cmdl.noaa.gov, Path: ccg/co2/GLOBALVIEW), 2008.

Gurney, K. R., Law, R. M., Denning, A. S., Rayner, P. J., Pak, B., and TransCom 3 L2 modelers: Transcom 3 Inversion Intercomparison: model mean results for the estimation of seasonal carbon sources and sinks, Global Biogeochem. Cy., 18, GB1010, doi:10.1029/2003GB002111, 2004.

Jacquinet-Husson, N., Scott, N. A., Chédin, A., Crépeau, L., Armante, R., Capelle, V., and 47 co-authors: The GEISA spectroscopic database: Current and future archive for Earth and planetary atmosphere studies, J. Quant. Spectrosc. Ra., 109, 1043–1059, 2008.

Hoelzemann, J. J., Schultz, M. G., Brasseur, G. P., Granier, C., and Simon, M.: The Global Wildland fire Emission Model GWEM: Evaluating the use of global area burnt satellite data, J. Geophys. Res., 109, D14S04, doi:10.1029/2003JD003666, 2004.

Houweling, S., Hartmann, W., Aben, I., Schrijver, H., Skidmore, J., Roelofs, G.-J., and Breon, F.-M.: Evidence of systematic errors in SCIAMACHY-observed CO2 due to aerosols, Atmos. Chem. Phys., 5, 3003–3013, 2005.

Machida, T., Matsueda, H., and Sawa, Y.: A new JAL project: CONTRAIL - Comprehensive Observation Network for Trace gases by AIrLiner, IGAC Newsletter, 37, 23–30, 2007.

Machida, T., Matsueda, H., Sawa, Y., Nakagawa, Y., Hirotani, K., Kondo, N., Goto, K., Nakazawa, T., Ishikawa, K., and Ogawa, T.: Worldwide measurements of atmospheric CO2 and other trace gas species using commercial airlines, J. Atmos. Ocean. Tech., 25(10), 1744–1754, doi:10.1175/2008JTECHA1082.1, 2008.

Maddy, E. S., Barnet, C. D., Goldberg, M., Sweeney, C., and Liu, X.: CO2 retrievals from the Atmospheric Infrared Sounder: Methodology and validation, J. Geophys. Res., 113, D11301, doi:10.1029/2007JD009402, 2008.

Matsueda, H., Inoue, H., and Ishii, M.: Aircraft observation of carbon dioxide at 8–13 km altitude over the western Pacific from 1993 to 1999, Tellus B, 54, 1–21, 2002.

Matsueda, H., Machida, T., Sawa, Y., Nakagawa, Y., Hirotani, K., Ikeda, H., Kondo, N., and Goto, K.: Evaluation of atmospheric CO2 measurements from new flask air sampling of JAL airliner observation, Pap. Meteorol. Geophys., 59, 1–17, 2008.

Nakazawa, T., Miyashita, K., Aoki, S., and Tanaka, M.: Temporal and spatial variations of upper troposphere and lower stratospheric carbon dioxide, Tellus, 43B, 106–117, 1991.

Rumelhart, D. E., Hinton, G. E., and Williams, R. J.: Learning internal representations by error propagation, in: Parallel Distributed Processing: Explorations in the Macrostructure of Cognition, vol. 1, edited by: Rumelhart, D. E. and McClelland, J. L., MIT Press, Cambridge, Mass, 318-362, 1986.

Sawa, Y., Machida, T., and Matsueda, H.: Seasonal variations of CO2 near the tropopause observed by commercial aircraft, J. Geophys. Res., 113, D23301, doi:10.1029/2008JD010568, 2008.

Scott, N. A. and Chédin, A.: A fast line-by-line method for atmospheric absorption computations: The Automatized Atmospheric Absorption Atlas, J. Appl. Meteorol., 20, 556–564, 1981.

Schneising, O., Buchwitz, M., Burrows, J. P., Bovensmann, H., Reuter, M., Notholt, J., Macatangay, R., and Warneke, T.: Three years of greenhouse gas column-averaged dry air mole fractions retrieved from satellite – Part 1: Carbon dioxide, Atmos. Chem. Phys., 8, 3827–3853, 2008.

Shia, R. L., Liang, M. C., Miller, C. E., and Yung, Y. L.: CO2 in the upper troposphere: Influence of stratosphere-troposphere exchange, Geophys. Res. Lett., 33, L14814, doi:10.1029/2006GL026141, 2006.

Stephens, B. B., Gurney, K. R., Tans, P. P., Sweeney, C., Peters, W., Bruhwiler, L., Ciais, P., Ramonet, M., Bousquet, P., Nakazawa, T., et al.: Weak northern and strong tropical land carbon uptake from vertical profiles of atmospheric CO2, Science, 316, 1732–1735, 2007.

Strahan, S., Douglass, A., Nielsen, J., and Boering, K.: The CO2 seasonal cycle as a tracer of transport, J. Geophys. Res., 103(D12), 13729–13741, 1998.

Strahan, S. E., Duncan, B. N., and Hoor, P.: Observationally derived transport diagnostics for the lowermost stratosphere and their application to the GMI chemistry and transport model, Atmos. Chem. Phys., 7, 2435–2445, 2007.

Strow, L. L. and Hannon, S. E.: A 4-year zonal climatology of lower tropospheric CO2 derived from ocean-only Atmospheric Infrared Sounder observations, J. Geophys. Res., 113, D18302, doi:10.1029/2007JD009713, 2008.

Tans, P. P., Fung, I. Y., and Takahashi, T.: Observational constraints on the global atmospheric CO2 budget, Science, 247, 1431–1438, 1990.

Tiwari, Y. K., Gloor, M., Engelen, R. J., Chevallier, F., Rodenbeck, C., Korner, S., Peylin, P., Braswell, B. H., and Heimann, M.: Comparing CO2 retrieved from Atmospheric Infrared Sounder with model predictions: Implications for constraining surface fluxes and lower-to-upper troposphere transport, J. Geophys. Res., 111, D17106, doi:10.1029/2005JD006681, 2006.

Turner, D. S.: The effect of increasing CO2 amounts on TOVS longwave sounding channels, J. Appl. Meteorol., 32, 1760–1766, 1993.

Turner, D. S.: HIRS sensitivity to CO2 mixing ratio and a pragmatic correction term, J. Appl. Meteorol., 33, 1155–1162, 1994.

Yang, Z., Washenfelder, R. A., Keppel-Aleks, G., Krakauer, N. Y., Randerson, J. T., Tans, P. P., Sweeney, C., and Wennberg, P. O.: New constraints on Northern Hemisphere growing season net flux, Geophys. Res. Lett., 34, L12807, 2007.