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The Vertical Distribution of Atmospheric CO 2

The Vertical Distribution of Atmospheric CO 2. Britton Stephens – NCAR/ATD Using NOAA/CMDL data and Transcom3 output Also using data from: LSCE, CSIRO, NIES, and Tohoku Univ. CMDL/CCGG 8/19/03. Outline Motivation – global inverse model uncertainty Data sources

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The Vertical Distribution of Atmospheric CO 2

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  1. The Vertical Distribution of Atmospheric CO2 Britton Stephens – NCAR/ATD Using NOAA/CMDL data and Transcom3 output Also using data from: LSCE, CSIRO, NIES, and Tohoku Univ. CMDL/CCGG 8/19/03

  2. Outline • Motivation – global inverse model uncertainty • Data sources • Model–data comparisons • Caveats, future work • Solicitation of feedback

  3. Annual mean TransCom3 Level 1 Results Gurney et al, Nature, 2002

  4. [courtesy of Scott Denning]

  5. Transcom3 Neutral Biosphere Flux Response

  6. Annual mean TransCom3 Level 1 Results Gurney et al, Nature, 2002

  7. 50-70 N

  8. Potential Problems • Data limited • Assuming flux corrections applied evenly across months • No diurnal cycle in the models • Fair weather bias • Heterogeneity, fossil fuel bias • Non-overlapping time periods

  9. Transcom3 Level 2 Inversion Results

  10. Still more data. . . . Ongoing sites not included in analyses: Fortaleza Santarem Hawaii Yakutsk Novosibirsk Sagami Bay FyodorovskoeSyktyvkar Zotino Bialystok Griffin Schauinsland Thüringen Hungary AEROCARB Network

  11. Caveats / Future Work • Diurnal bias • Time of day data analysis • Subsample a diurnally resolved model • Fair weather bias • Look at COBRA data • Subsample a coupled mesoscale model • Heterogeneity, fossil fuel bias • Look at CO data and model FF gradients • Non-overlapping times • Look at Carr and Sendai trends

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