RepeatYearForcingStrategiesforACCESS-OM2

AndyHogg,KialStewart,NicHannah,AndrewKiss,AidanHeerdegen&the

COSIMAteam

ACCESS-OM2Pre-releaseACCESS-OM2pre-releaseandtesFngisunderway:–  Thedefault1°versionbasedheavilyonACCESS-CM2;–  The0.25°versiondevelopedbyARCCSS;– Anew0.1°configura4on,fundedbyCOSIMALinkageProject(ANU,UNSW,BoM,CSIRO,AAD,UTas).

ConfiguraFonsarenowin3rdpre-releasestage,see:

hYps://github.com/OceansAus/access-om2

What’sintheBox?•  BasedonMOM5,CICE5,OASIS-MCTandMATM.•  JRA55forcingsupported.•  Newmethodofse`ngupregriddinginterpolaFonusingESMF.This

isnecessarybecausetheregriddingmethodusedbyOASISwon'tscaleto0.1°.

•  Significantperformanceimprovements,especiallytodowithcoupling.Weexpectthefinalmodeltorunonlyafew%slowerthanstandaloneMOM5.

•  Runoffregriddingisdone,basedonofflineregriddingworkusingthekdtreedatastructurebyRussFiedler(CSIRO).

•  Ironedoutmanycouplingbugs,someofwhichmayhaveexistedforsomeFme.

•  Willincludenew0.1°bathymetry(RussFiedler)

IniFaltesFngModel Resolu4on NCPUs Years/Day Notes

ACCESS-OM2 1° 252 40

ACCESS-OM2-025 0.25° 1455 21

ACCESS-OM2-01 0.1° 5600 ~3 Nottestedyet

IniFaltesFng

ForcingStrategies(thankstoKialStewart)•  MATMisa“file-based”atmosphere•  WeuseJRA55-do(1955-2016)•  “RepeatYearForcing”opFonforspinup•  Pickayearwhichminimisesvariability•  UseMay1990toApril1991