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WNA-BackTraj Data Released

Data Release
Issued
June 13, 2025
Resolved
Data Alert
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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.

Referenced Datasets

Dataset Name Format
Western North American FLEXPART Back Trajectory 1994 Data NetCDF-4
Western North American FLEXPART Back Trajectory 1994-2021 Merge Data NetCDF-4
Western North American FLEXPART Back Trajectory 1995 Data NetCDF-4
Western North American FLEXPART Back Trajectory 1996 Data NetCDF-4
Western North American FLEXPART Back Trajectory 1997 Data NetCDF-4
Western North American FLEXPART Back Trajectory 1998 Data NetCDF-4
Western North American FLEXPART Back Trajectory 1999 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2000 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2001 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2002 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2003 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2004 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2005 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2006 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2007 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2008 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2009 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2010 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2011 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2012 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2013 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2014 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2015 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2016 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2017 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2018 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2019 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2020 Data NetCDF-4
Western North American FLEXPART Back Trajectory 2021 Data NetCDF-4
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Details

Last Updated

March 25, 2026

Published

March 25, 2026