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A correlated stochastic model for the large-scale advection, condensation and diffusion of water vapour

Author(s)
Beucler, Tom G.
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Abstract
The statistically steady distribution of water vapour and its characteristics are studied in the framework of the Ornstein–Uhlenbeck (OU) turbulent dispersion model. Particles are advected by a stochastic velocity field with a finite time correlation, and condense as soon as their moisture content exceeds a local saturation value. We discretize the OU model to a finite number of velocity values, and find simple analytical solutions for the bimodal distribution of water vapour and the non‐diffusive moisture flux, which perfectly agree with the corresponding Monte‐Carlo simulations. Furthermore, we show that these simple models produce results that approximate well the OU Monte‐Carlo simulations, suggesting that they could be used as general tools to understand correlated stochastic processes that involve condensation.
Date issued
2016-02
URI
http://hdl.handle.net/1721.1/115304
Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Journal
Quarterly Journal of the Royal Meteorological Society
Publisher
Wiley Blackwell
Citation
Beucler, Tom. “A Correlated Stochastic Model for the Large-Scale Advection, Condensation and Diffusion of Water Vapour.” Quarterly Journal of the Royal Meteorological Society 142, 697 (April 2016): 1721–1731 © 2018 Royal Meteorological Society
Version: Author's final manuscript
ISSN
0035-9009
1477-870X

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