Abstract
Backward Lagrangian stochastic models calculate particle trajectories in the atmosphere upstream of an observation point. A feature of these models is the ease with which the vertical flux contribution from surface area sources can be calculated. The flux contribution at an observation point P is found by summing the ratio of the particle vertical velocity at P to the “touchdown” velocity for particles which impact the ground within the source boundary.
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Flesch, T.K. The footprint for flux measurements, from backward Lagrangian stochastic models. Boundary-Layer Meteorol 78, 399–404 (1996). https://doi.org/10.1007/BF00120943
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DOI: https://doi.org/10.1007/BF00120943