Modelling uncertainty using stochastic transport noise in a 2-layer quasi-geostrophic model
Modelling uncertainty using stochastic transport noise in a 2-layer quasi-geostrophic model
复制标题
在 2 层准地转模型中使用随机传输噪声对不确定性进行建模
DOI:
10.3934/fods.2020010
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发表时间:
2018
影响因子:
2.3
通讯作者:
I. Shevchenko
中科院分区:
文献类型:
--
作者:
C. Cotter;D. Crisan;Darryl D. Holm;Wei Pan;I. Shevchenko
The stochastic variational approach for geophysical fluid dynamics was introduced by Holm (Proc Roy Soc A, 2015) as a framework for deriving stochastic parameterisations for unresolved scales. This paper applies the variational stochastic parameterisation in a two-layer quasi-geostrophic model for a \begin{document}$ \beta $\end{document} -plane channel flow configuration. We present a new method for estimating the stochastic forcing (used in the parameterisation) to approximate unresolved components using data from the high resolution deterministic simulation, and describe a procedure for computing physically-consistent initial conditions for the stochastic model. We also quantify uncertainty of coarse grid simulations relative to the fine grid ones in homogeneous (teamed with small-scale vortices) and heterogeneous (featuring horizontally elongated large-scale jets) flows, and analyse how the spread of stochastic solutions depends on different parameters of the model. The parameterisation is tested by comparing it with the true eddy-resolving solution that has reached some statistical equilibrium and the deterministic solution modelled on a low-resolution grid. The results show that the proposed parameterisation significantly depends on the resolution of the stochastic model and gives good ensemble performance for both homogeneous and heterogeneous flows, and the parameterisation lays solid foundations for data assimilation.
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DOI:
10.1098/rspa.2017.0388
发表时间:
2017-09
期刊:
Proceedings. Mathematical, physical, and engineering sciences
影响因子:
--
作者:
Cotter CJ;Gottwald GA;Holm DD
通讯作者:
Holm DD
影响因子:
3.2
作者:
Shevchenko I
通讯作者:
Shevchenko I
影响因子:
1.9
作者:
Shevchenko I
通讯作者:
Shevchenko I
影响因子:
3.2
作者:
Cooper F
通讯作者:
Cooper F