### Abstract

Due to rising or descending air and due to gravity, aerosol particles carry out a complicated, chaotic motion and move downwards on average. We simulate the motion of aerosol particles with an atmospheric dispersion model called the Real Particle Lagrangian Trajectory (RePLaT) model, i.e., by solving Newton's equation and by taking into account the impacts of precipitation and turbulent diffusion where necessary, particularly in the planetary boundary layer. Particles reaching the surface are considered to have escaped from the atmosphere. The number of non-escaped particles decreases with time. The short-term and long-term decay are found to be exponential and are characterized by escape rates. The reciprocal values of the short-term and long-term escape rates provide estimates of the average residence time of typical particles, and of exceptional ones that become convected or remain in the free atmosphere for an extremely long time, respectively. The escape rates of particles of different sizes are determined and found to vary in a broad range. The increase is roughly exponential with the particle size. These investigations provide a Lagrangian foundation for the concept of deposition rates.

Original language | English |
---|---|

Pages (from-to) | 867-881 |

Number of pages | 15 |

Journal | Nonlinear Processes in Geophysics |

Volume | 20 |

Issue number | 5 |

DOIs | |

Publication status | Published - 2013 |

### Fingerprint

### ASJC Scopus subject areas

- Geochemistry and Petrology
- Geophysics
- Statistical and Nonlinear Physics

### Cite this

*Nonlinear Processes in Geophysics*,

*20*(5), 867-881. https://doi.org/10.5194/npg-20-867-2013

**Escape rate : A Lagrangian measure of particle deposition from the atmosphere.** / Haszpra, T.; Tél, T.

Research output: Contribution to journal › Article

*Nonlinear Processes in Geophysics*, vol. 20, no. 5, pp. 867-881. https://doi.org/10.5194/npg-20-867-2013

}

TY - JOUR

T1 - Escape rate

T2 - A Lagrangian measure of particle deposition from the atmosphere

AU - Haszpra, T.

AU - Tél, T.

PY - 2013

Y1 - 2013

N2 - Due to rising or descending air and due to gravity, aerosol particles carry out a complicated, chaotic motion and move downwards on average. We simulate the motion of aerosol particles with an atmospheric dispersion model called the Real Particle Lagrangian Trajectory (RePLaT) model, i.e., by solving Newton's equation and by taking into account the impacts of precipitation and turbulent diffusion where necessary, particularly in the planetary boundary layer. Particles reaching the surface are considered to have escaped from the atmosphere. The number of non-escaped particles decreases with time. The short-term and long-term decay are found to be exponential and are characterized by escape rates. The reciprocal values of the short-term and long-term escape rates provide estimates of the average residence time of typical particles, and of exceptional ones that become convected or remain in the free atmosphere for an extremely long time, respectively. The escape rates of particles of different sizes are determined and found to vary in a broad range. The increase is roughly exponential with the particle size. These investigations provide a Lagrangian foundation for the concept of deposition rates.

AB - Due to rising or descending air and due to gravity, aerosol particles carry out a complicated, chaotic motion and move downwards on average. We simulate the motion of aerosol particles with an atmospheric dispersion model called the Real Particle Lagrangian Trajectory (RePLaT) model, i.e., by solving Newton's equation and by taking into account the impacts of precipitation and turbulent diffusion where necessary, particularly in the planetary boundary layer. Particles reaching the surface are considered to have escaped from the atmosphere. The number of non-escaped particles decreases with time. The short-term and long-term decay are found to be exponential and are characterized by escape rates. The reciprocal values of the short-term and long-term escape rates provide estimates of the average residence time of typical particles, and of exceptional ones that become convected or remain in the free atmosphere for an extremely long time, respectively. The escape rates of particles of different sizes are determined and found to vary in a broad range. The increase is roughly exponential with the particle size. These investigations provide a Lagrangian foundation for the concept of deposition rates.

UR - http://www.scopus.com/inward/record.url?scp=84887004023&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84887004023&partnerID=8YFLogxK

U2 - 10.5194/npg-20-867-2013

DO - 10.5194/npg-20-867-2013

M3 - Article

VL - 20

SP - 867

EP - 881

JO - Nonlinear Processes in Geophysics

JF - Nonlinear Processes in Geophysics

SN - 1023-5809

IS - 5

ER -