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Our computer system manager, Chris Cooper has now left DAMTP (to defect to Oxford) leaving Nicholas Pinney to take on board some of Chris' role as system manager.
David Sankey has joined the group at DAMTP to work on something to do with the QBO.
Chris Warner is continuing his work on modelling the propagation of a spectrum of gravity waves through realistic middle atmospheres. This is working towards a practical spectral gravity wave parametrization schemes for the UGAMP GCMs.
Using only a saturation spectral profile for gravity waves as a 'chopping function', similar gravity wave drag and energy per unit mass growth with height to Fritts and Lu's observation based work can be obtained. This `Rich man's' scheme and its associated single column model of gravity wave spectrum propagation, are currently being written up as a paper to be submitted to JAS.
Important insight into practical parametrization (`Poor man's') schemes has been achieved and a practical scheme will be written early next year.
John Scinocca is working on the tropospheric forcing of stratosphericthan waves using a 'simplest possible' model. The troposphere is relaxed towards a baroclinically unstable state. There is no large scale inhomogeneity and intermittent bursts of wave one and wave two activity result. John is using the BDM, otherwise known as the SGCM for these studies.
Gudrun Magnusdottir is using wave activity diagnostics to examine baroclinic lifecycles. These can be used to interpret propagation in 2D models. Gudrun aims to use PV inversion algorithms to generate new basic states.
Chris Warner
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