Stochastic modelling of primitive equation and quasi-geostrophic subgrid turbulence

Jorgen Frederiksen, Vassili Kitsios, Martin Dix, Stacey Osbrough

Research output: Contribution to conferenceAbstract

Abstract

A general method for stochastic and deterministic modelling of subgrid scale turbulence is presented and applied to primitive equation and quasi-geostrophic models of atmospheric and oceanic flows. Dynamical and thermodynamical subgrid-scale parameterisations of eddy drain, net dissipation and stochastic backscatter are calculated for a multi-level primitive equation atmospheric general circulation model. The parameterisations have only moderate variability with height and a cusp behaviour with peaks near the largest retained wave number. They are compared with corresponding results for quasi-geostrophic models of the atmosphere and ocean for which the parameterisations are shown to satisfy scaling laws. Large-eddy simulations (LES) with the subgrid terms very closely reproduce the results of higher resolution direct numerical simulations. The method is shown to produce parameterisations and LES with similar skill for three-dimensional turbulence in boundary layer channel flow.
Original languageEnglish
Number of pages1
Publication statusPublished - 2016
Externally publishedYes
EventEGU General Assembly 2016 - Vienna, Austria
Duration: 17 Apr 201622 Apr 2016
https://www.egu2016.eu/

Conference

ConferenceEGU General Assembly 2016
Abbreviated titleEGU2016
CountryAustria
CityVienna
Period17/04/1622/04/16
Internet address

Cite this