HYSPLIT has also been used in a variety of simulations describing the atmospheric transport, dispersion, and deposition of pollutants and hazardous materials. One of the most common model applications is a back-trajectory analysis to determine the origin of air masses and establish source–receptor relationships. HYSPLIT continues to be one of the most extensively used atmospheric transport and dispersion models in the atmospheric sciences community. The National Oceanic and Atmospheric Admin-istration (NOAA) Air Resources Laboratory’s(ARL) Hybrid Single-Particle Lagrangian Integrated Trajectory model (HYSPLIT) ( Draxler and Hess 1998) is a complete system for computing simple air parcel trajectories as well as complex transport, dispersion, chemical transformation, and deposition simulations. This work presents HYSPLIT’s historical evolution over the last three decades along with recent model developments and applications. See Draxler and Rolph (2012) for further details. Illustration of particulate cesium-137 concentrations originated from the Fukushima Daiichi reactor. More details about volcanic ash simulations can be found at We assume a particle distribution based on four size bins ( Heffter and Stunder 1993). The height of the eruption column is estimated from Collini et al. The source term is based on an empirical formula that relates the height of the eruption column to the mass eruption rate ( Mastin et al. For this illustration, a total of 25 million 3D particles were released from 4 to and transported/dispersed using the GDAS meteorological dataset.
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Įxample of the calculated ash column corresponding to the eruption of the Cordón Caulle volcano in South America for 0600 UTC. Modeled (colored contours) and measured (colored circles) PMCH concentrations (pg m –3) averaged over 48 h corresponding to (a) CAPTEX tracer release 2 from Dayton from 1700 to 2000 UTC and (b) CAPTEX tracer release 7 from Sudbury, Ontario, Canada, from 0600 to 0900 UTC. The dark blue box corresponds to HYSPLIT4 and the light blue boxes correspond to applications that derive from HYSPLIT4. The dark gray shade corresponds to the first three versions of the HYSPLIT system. The light gray shade describes models that influenced HYSPLIT.