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Validation of the dynamical core of the Portable University Model of theAtmosphere (PUMA)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
2006 (English)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A widely used dynamical core, PUMA (Portable University Model of the Atmosphere),

is validated using the test case specifications introduced by Polvani et al.

(2004). Dynamical cores are essential in every presently used AGCM (Atmospheric

General Circulation Model), and deal with the dry, adiabatic primitive equations.

The validation process is important in order to establish that the dynamical core is

free from bugs, and thereby confirm the validity AGCMs. The test case proposed by

Polvani et al. (2004) consists of a 12 day time-integrated slightly perturbed, baroclinically

unstable, midlatitude jet, and is, together with derivations of the model

equations, completely described in this M. Sc. thesis. The initial condition for the

test case is implemented in PUMA, to a modification in order to carry out the same

test case as in Polvani et al. (2004).

The temperature and vorticity fields are presented and compared. The numerically

converged solutions from PUMA are in strong accordance with the solutions

from Polvani et al. (2004), despite different numerical schemes to solve the equations.

This supports the validity and reliability for future studies with PUMA.

Abstract [sv]

En torr, adiabatisk primitiv ekvationsmodell, PUMA (Portable University Model of

the Atmosphere), valideras genom att jämföra dess lösningar med resultaten som

presenterades av Polvani et al. (2004). Primitiva ekvationsmodeller är en viktig del i

dagens allmänna cirkulationsmodeller. Valideringsprocessen är viktig för att fastslå

att de primitiva ekvationsmodellerna fungerar utan buggar, och därigenom bekräfta

att en viktig del av de allmänna cirkulationsmodellerna fungerar tillfredsställande.

Initialtillståndet som presenterades av Polvani et al. (2004) består av en 12 dagars

tids-integrerad, något perturberad, baroklint instabil polarjet. Initialtillståndet

är, tillsammans med härledningarna av modellekvationerna, fullständigt beskriven

i detta examensarbete. Initialtillståndet implementeras i PUMA, vilken har modifierats

för att konstruera samma testspecifikationer som i Polvani et al. (2004).

Temperatur- och virvlingsfälten presenteras och jämförs. De numeriskt konvergerade

lösningarna från PUMA stämmer väl överrens med lösningarna från Polvani

et al. (2004), trots att olika numeriska scheman använts för att lösa ekvationerna.

Detta stödjer validiteten hos PUMA, vilket ökar tillförlitligheten i framtida studier

med modellen.

Place, publisher, year, edition, pages
, Examensarbete vid Institutionen för geovetenskaper
Keyword [en]
dynamic core validation, PUMA, temperature fields, vorticity fields
National Category
Meteorology and Atmospheric Sciences
URN: urn:nbn:se:uu:diva-303878OAI: oai:DiVA.org:uu-303878DiVA: diva2:974313
Subject / course
Available from: 2016-10-04 Created: 2016-09-26 Last updated: 2016-10-04Bibliographically approved

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