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Approach:
Monthly NASA-CASA model estimates of NO emissions from soils were simulated for a nine-state
region of the southeastern USA, as part of the Southern Oxidants Study (SOS). Simulations used a
regional geographic information system (GIS) as the data source for climate drivers, satellite
images, land cover, and soil properties over a 8-km grid resolution. The simulated emissions are
used to place the relative magnitude of soil NO emissions into perspective with other regional
sources of NOx, and to examine spatial and temporal patterns of soil NO emissions across the
region.
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