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6 Meeting the Challenges of Characterizing Methane Emissions
Pages 179-184

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From page 179...
... There are many benefits of building a strong link between atmospheric measurements of methane concentrations and methane emission inventories, including the discovery of missing sources or processes, improved confidence in the basic data that enter into decisions by companies and governments, and better capability to detect trends over time. The effective interlinking of top-down and bottom-up approaches involves strengthening both approaches, as recommended in Box 6.1.
From page 180...
... Recommendation 1: The National Oceanic and Atmospheric Administration and the National Aeronautics and Space Administration should continue and enhance current atmospheric methane observations and advance models and assimilation techniques used by top-down approaches. FIGURE 6.1  Schematic summarizing the four major recommendations for improving characterization of anthropogenic methane emissions in the United States.
From page 181...
... Meeting the Challenges of Characterizing Methane Emissions 181
From page 182...
... Current models cannot adequately represent smallscale processes that affect measured concentrations, such as planetary boundary layer mixing and diurnal growth, convection, and complex effects of local topography. Advances in atmospheric modeling are needed, as well as innovative model evaluation tools.
From page 183...
... The GHGI has increasingly been used for purposes for which it was not initially designed, including comparisons with top-down estimates of methane emissions in specific regions at specific times. The gridded inventory should be consistent with the national GHGI inventory for integrated total emissions per source and have sufficient documentation to allow the scientific and policy communities interested in regional methane emissions to reproduce and adapt the inventory.
From page 184...
... The Committee calls for a sustained coordinated national research effort to improve top-down and bottom-up estimation and monitoring methods and technologies. These efforts should include results from atmospheric observations, sustained spatial and temporal characterization of methane emissions for key sectors in the United States, improvements in models and assimilation techniques used by top-down approaches, and improvements in estimation techniques and process models.

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