Journal ArticleDOI
Criteria for the selection of stochastic models of particle trajectories in turbulent flows
TLDR
In this paper, the relationships between the various criteria are examined for a very general class of models and it is shown that most of the criteria are equivalent and also how a model can be designed to satisfy these criteria exactly and to be consistent with inertial-subrange theory.Abstract:
Many different random-walk models of dispersion in inhomogeneous or unsteady turbulence have been proposed and several criteria have emerged to distinguish good models from bad. In this paper the relationships between the various criteria are examined for a very general class of models and it is shown that most of the criteria are equivalent. It is also shown how a model can be designed to satisfy these criteria exactly and to be consistent with inertial-subrange theory. Some examples of models that obey the criteria are described. As an illustration some calculations of dispersion in free-convective conditions are presented.read more
Citations
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Journal ArticleDOI
Deducing Ground-to-Air Emissions from Observed Trace Gas Concentrations: A Field Trial
TL;DR: In this article, the gas emission rate from an artificial 36m2 surface area source was inferred from line-average concentration (CL) measured by an open-path laser situated up to 100 m downwind.
Journal ArticleDOI
From ERA-Interim to ERA5: the considerable impact of ECMWF's next-generation reanalysis on Lagrangian transport simulations
Lars Hoffmann,Gebhard Günther,Dan Li,Dan Li,Olaf Stein,Xue Wu,Xue Wu,Sabine Griessbach,Yi Heng,Paul Konopka,Rolf Müller,Bärbel Vogel,Jonathon S. Wright +12 more
TL;DR: In this paper, the authors compared the performance of ERA5 and ERA-Interim trajectories for the free troposphere and the stratosphere for the year 2017, and found that ERA5 trajectories exhibited significantly improved conservation of potential temperature in the free tropical and stratosphere, pointing to an improved consistency of ECMWF's forecast model and observations.
Journal ArticleDOI
Surfing, spinning, or diving from reef to reef: effects on population connectivity
TL;DR: The impact of larval behavior extends beyond enhancing the process of self-recruitment by changing population connectivity patterns, and larval survival emerged as a key component for connectivity estimates, the study of which poses a great challenge in tropical ecosystems.
Journal ArticleDOI
A density correction for Lagrangian particle dispersion models
Andreas Stohl,David J. Thomson +1 more
TL;DR: In this article, a Langevin equation that contains a density correction term was proposed to simulate the dispersion of passive tracers in the turbulent planetary boundary layer (PBL), where the density at the boundary layer top may be lower by more than 20% than at the surface, leading to errors in the tracer concentrations on the order of 10% in the presence of vertical wind shear.
Journal ArticleDOI
A three-dimensional backward lagrangian footprint model for a wide range of boundary-layer stratifications
TL;DR: In this paper, a three-dimensional Lagrangian footprint model with the ability to predict the area of influence (footprint) of a measurement within a wide range of boundary-layer stratifications and receptor heights is presented.
References
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Journal ArticleDOI
An Introduction to Probability Theory and Its Applications.
Journal ArticleDOI
Turbulence Structure in the Convective Boundary Layer
TL;DR: In this paper, a boundary layer experiment conducted over a flat site in northwestern Minnesota is discussed, where wind and temperature fluctuations near the ground were measured with AFCRL's fast-response instrumentation on a 32 m tower with MRU probes attached at five different heights to the tethering cable of a 1300 m2 kite balloon.
Book
Theory and Applications of Stochastic Differential Equations
Zeev Schuss,Robert O'Malley +1 more
TL;DR: Presents theory, sources, and applications of stochastic differential equations of Ito's type; those containing white noise; and the role of partial differential equations in this context.