The Atmospheric Science Data Center (ASDC) has released data for the Western North America (WNA) Back Trajectory (BackTraj) FLEXible PARTicle (FLEXPART) dispersion model. Backward simulations of airmass transport using a Lagrangian Particle Dispersion Model (LPDM) framework can establish source-receptor relationships (SRRs), supporting analysis of source contributions from various geospatial regions and atmospheric layers to downwind observations. For each receptor, the FLEXPART dispersion model, driven by ERA5 reanalysis data, was used to achieve 15-day backwards SPR calculations, proving global simulations at high temporal (hourly) and spatial (1 degree x 1 degree) resolution, from the surface up to 20 km above ground level. This product retains detailed information for each receptor, including the gridded ozone value product, allowing the user to illustrate and identify source contributions to various subsets of ozone observations in the troposphere above WNA over nearly 3 decades at different vertical layers and temporal scales, such as diurnal, daily, seasonal, intra-annual, and decadal.
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