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- GC14A-08: Developing a multiscale plume‐in‐grid model to simulate subgrid plumes for stratospheric aerosol injection.
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NOLA CC
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Hongwei Sun, University of Hawaii at Manoa (First Author, Presenting Author)
Sebastian Eastham, Massachusetts Institute of Technology
David Keith, University of Chicago
Computer models used to understand how aircraft damage the environment usually split the atmosphere into large boxes with a length scale of ∼100 km, ignoring smaller scale variations in pollutants inside the box. Pollution produced by aircraft is released in narrow plumes that are much smaller than the box. Some chemical or physical processes could occur much faster inside a high-concentration exhaust plume than when the same amount of pollution is spread out over the large box, which may produce big errors in calculating the impact of aircraft emissions in the stratosphere where plumes mix slowly. This also causes problems for predicting the impacts of solar geoengineering in which aircraft emit reflective material to cool the planet. One can fix the problem by making the boxes much smaller, which requires too much computer time to be practical.We describe a method using smaller boxes just where they are most needed at the plume. After the plume has spread a bit, our “plume-in-grid” model then eliminates the small boxes and gives the information back to the conventional computer model's big box. This can allow more accurate calculations of the impacts of pollution plumes for a given amount of computing time.
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