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- W2000432917 abstract "Large‐scale carbon sources and sinks can be estimated by combining atmospheric CO 2 concentration data with atmospheric transport inverse modeling. This approach has been limited by sparse spatiotemporal tropospheric sampling. CO 2 estimates from space using observations on recently launched satellites (Atmospheric Infrared Sounder (AIRS)), or platforms to be launched (Infrared Atmospheric Sounding Interferometer (IASI), Orbiting Carbon Observatory (OCO)) have the potential to fill some of these gaps. Here we assess the realism of initial AIRS‐based mid‐to‐upper troposphere CO 2 estimates from European Centre for Medium‐Range Weather Forecasts by comparing them with simulations of two transport models (TM3 and Laboratoire Meteorologie Dynamique Zoom (LMDZ)) forced with one data‐based set of surface fluxes. The simulations agree closer with one another than with the retrievals. Nevertheless, there is good overall agreement between all estimates of seasonal cycles and north‐south gradients within the latitudinal band extending from 30°S to 30°N, but not outside this region. At smaller spatial scales, there is a contrast in the satellite‐based retrievals above continents versus above oceans that is absent in the model predictions. Hovmoeller diagrams indicate that in the models, high Northern Hemisphere winter CO 2 concentrations propagate toward the tropical upper troposphere via Northern Hemisphere high latitudes, while in retrievals, elevated winter CO 2 appears instantaneously throughout the Northern Hemisphere. This raises questions about lower‐to‐upper troposphere transport pathways. Prerequisites for use of retrievals to provide an improved constraint on surface fluxes are therefore further improvements in retrievals and better understanding/validation of lower‐to‐upper troposphere transport and its modeling. This calls for more independent upper troposphere transport tracer data like SF 6 and CO 2 ." @default.
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- W2000432917 date "2006-09-09" @default.
- W2000432917 modified "2023-10-15" @default.
- W2000432917 title "Comparing CO<sub>2</sub>retrieved from Atmospheric Infrared Sounder with model predictions: Implications for constraining surface fluxes and lower-to-upper troposphere transport" @default.
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- W2000432917 doi "https://doi.org/10.1029/2005jd006681" @default.
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