BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Talks.cam//talks.cam.ac.uk// X-WR-CALNAME:Talks.cam BEGIN:VEVENT SUMMARY:Scale-awareness in an energetically constrained eddy parameterisat ion - Julian Mak (HKUST) DTSTART:20231109T140000Z DTEND:20231109T150000Z UID:TALK206791@talks.cam.ac.uk CONTACT:Dr Michael Haigh DESCRIPTION:There is an increasing interest in mesoscale eddy parameterisa tions that are scale-aware\, normally interpreted to mean that a parameter isation does not require parameter recalibration as the model resolution c hanges. Here we examine whether Gent-McWilliams (GM) based version of GEOM ETRIC\, a mesoscale eddy parameterisation that is constrained by a paramet erised eddy energy budget\, is scale-aware in its energetics. It is genera lly known that GM-based schemes severely damp out explicit eddies\, so the parameterised component would be expected to dominate across resolutions\ , and we might expect a negative answer to the question of energetic scale -awareness. A consideration of why GM- based schemes damp out explicit edd ies leads a suggestion for what we term a splitting procedure: a definitio n of a "large-scale" field is sought\, and the eddy-induced velocity from the GM-scheme is computed from and acts only on the large-scale field\, al lowing explicit and parameterised components to co-exist. The procedure is primarily investigated within the context of an idealised re-entrant chan nel model of the Southern Ocean. Evidence is provided that the GM-based ve rsion of GEOMETRIC is scale-aware in the energetics as long as we employ a splitting procedure. The splitting procedure also leads to an improved re presentation of mean states without detrimental effects on the explicit ed dy motions at eddy permitting resolutions. If time\, results from a joint evaluation of the physical and biogeochemical response in an idealised mid -latitude gyre model at eddy permitting resolution will be presented. LOCATION:BAS Seminar Room 330b\; https://ukri.zoom.us/j/93867373517 END:VEVENT END:VCALENDAR