Michael Naughton, Wenming Lu

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Availability of ACCESS City Forecast System to the National Research Community Michael Naughton, Wenming Lu The Centre for Australian Weather and Climate Research – A partnership between the Bureau of Meteorology and CSIRO, Melbourne, Australia M.Naughton@bom.gov.au, L.Wenming@bom.gov.au ACCESS City Forecast System ACCESS City Forecast system, ACCESS-C, is the operational numerical weather prediction system with the highest resolution in the Bureau of Meteorology (BoM). ACCESS-C has spatial resolution of 4km, vertical resolution of 70 levels. ACCESS-C covers 6 domains, South-East Queensland (Brisbane), Sydney, Victoria/Tasmania (VicTas), Adelaide, Perth and Darwin. ACCESS-C runs out to 36 hours and 4 times daily, 00, 06, 12 and 18Z (UTC), nesting within ACCESS Regional (ACCESS-R, 12km): the initial and boundary conditions are interpolated from the larger ACCESS-R analyses and forecasts. DOMAIN ABBR. LAT. RANGE LON. RANGE GRID Brisbane BN -31.00S, -22.04S 148.00E, 156.03E 250x224 Sydney SY -38.00S, -29.98S 147.00E, 155.03E 224x224 VicTas VT -46.00S, -33.04S 139.00E, 150.99E 362x334 Adelaide AD -39.50S, -29.53S 132.00E, 141.98E 278x306 Perth PH -37.00S, -28.04S 112.00E, 122.98E 250x306 Darwin DN -16.00S, -7.97S 128.50E, 139.98E 224x320 NeCTAR Climate and Science Laboratory ACCESS Model Experimental Library: ACCESS-C Standard job Simple Facts for Reference Brisbane ( BN domain, other domains scale with number of grid pints): Using 64 cores Wall time: around 1500 seconds ~ 25minutes CPU time: 95000 seconds ~ 26 CPU hours Input data size: dump (for initial condition) 5.2Gb pi files (for lateral boundary condition) 63Gb Output data size: initial condition 300Mb lateral boundary condition 3.9Gb total forecast data 18 Gb ROSE/CYLC ACCESS-C Suite @ accessdev Remote Jobs @ raijin Easy to run: install the executable, configuration on raijin and suite on accessdev, use the input data available then run it by a single command. Sample forecast data on raijin: easy to compare the output to make sure things are fine. Source code on raijin: modify the physics and compile your own executable to improve UM! BoM Daily initial and boundary conditions available in RDSI supported archive at NCI. Research configurations can also be run for higher resolution (e.g. 1.5km) and other locations. Wiki: https://trac.nci.org.au/trac/access/wiki/AccessModelExperimentLibrary Figure: ACCESS-C running in Cylc Sample Forecast Plots SY Fire Weather Oct 2013 SY Fire Weather Oct 2013 1.5km AD Heatwave Jan 2013 VT Gusty Wind Oct 2013 BN Heavy Rainfall Jan 2013