ACCESS-OM2-01, a global 0.1-degree ocean-sea ice model for...

ACCESS-OM2-01

Kiss, Hogg,Spence, England,

Heil, Oke,Brassington,

Hannah, Fiedler,Heerdegen, Ward

cosima.org.au

ACCESS-OM2-01,a global 0.1-degreeocean-sea ice model

for the next phase of Bluelink

Andrew Kiss ([email protected]),Andy Hogg (ANU), Paul Spence (UNSW), Matthew England (UNSW),

Petra Heil (AAD & ACE CRC, UTas), Peter Oke (CSIRO),Gary Brassington (BOM), Nicholas Hannah (Double Precision),

Russell Fiedler (CSIRO), Aidan Heerdegen (ANU), Marshall Ward (ANU),

ACOMO workshop, 9–11 October 2018, Canberra

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COSIMA: Consortium for Ocean-Sea Ice Modelling in AustraliaACCESS-OM2 is being developed by COSIMA (cosima.org.au)COSIMA is two things:

1. A collaborative consortium within Australia’s ocean & sea ice modellingcommunity that integrates capability from different groups, and

2. A Linkage Project to develop ACCESS-OM2, a global coupledocean - sea ice model

I for nationwide use in ocean and sea ice process studies on timescales up tomultidecadal (at high resolution) or multicentennial (at low resolution)

I to form the dynamical core of Bluelink (OceanMAPSv4.0), to extend Bluelinkreanalyses and forecasts to global coverage, including sea ice

I to inform the development of higher-resolution ocean and sea ice componentsin future versions of the ACCESS coupled climate model

Partners (investigators) include:I Australian Antarctic Division (Heil)I BoM (Brassington)I CSIRO (Oke)I ANU (Hogg), UNSW (England, Spence) & UTas (Heil, Nikurashin)

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The ACCESS-OM2 model suite

I Ocean model: Modular Ocean Model (MOM) 5.1I global (90◦N – 81◦S); tripolar in Arctic; Mercator for 65◦N – 65◦SI three resolutions: 1◦, 0.25◦, 0.1◦ horizontal resolutionI z∗ vertical coordinate, 50 or 75 levelsI Initial condition and salt restoring: World Ocean Atlas 2013v2

I Sea-ice model: CICE 5.1I classic EVP dynamics (for now)I ridging scheme with 5 thickness categoriesI mushy ice thermodynamics at 0.1◦ (for now), 4 ice layers + 1 snow

I Prescribed atmospheric forcing: JRA55-do

I Coupler: OASIS3-MCTI Not included:

I Ice shelf cavities, dynamic ice shelvesI Icebergs, distributed iceberg freshwater fluxI Tides, surface waves (for now!)

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ACCESS-OM2 vs. ACCESS-OM, OFAM3, etc.

I ACCESS-OM2 updates and extends ACCESS-OM and OFAM3

I Uses same MOM, CICE and OASIS versions as ACCESS-CM2 (1◦)

I Builds on experience with ACCESS-OM, MOM-SIS-025 and MOM-SIS-01

I Newer forcing, bathy & sea ice than MOM-SIS-01 (Spence et al., 2017)

ACCESS-OM OFAM3 ACCESS-OM2Ocean MOM 4.1 MOM 4.1 MOM 5.1Sea ice CICE 4.1 — CICE 5.1Coupler OASIS 3.25 — OASIS 3-MCT

Grid global tripolar, z∗ 75◦S–75◦N only, z∗ global tripolar, z∗

Resolution 1◦, 360×300×500.1◦, 3600×1500×51,∆z=5 – 1000m

0.1◦, 3600×2700×75,∆z=1.1 – 198m(also 0.25◦ and 1◦)

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Vertical resolution∆z=1.1 – 198 m (cf. 5 – 1000 m in OFAM3)75 level vertical grid is finer than OFAM3 at all depths other than 100 – 260 mSpacing optimised for resolving baroclinic modes

Relative error in baroclinic modesGrid E (R1) E (R2) E (R3)

KDS75 0.346 0.384 0.408OFAM51 0.490 0.542 0.562

(Stewart et al., 2017)

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ACCESS-OM2 is available in three horizontal resolutionsACCESS-OM2

I 1◦ horizontal grid

I 55–24 km below 60S

I 50, 75 or 100 levels

I fast and cheap∼ 16min/yr on 252 PEs, dt=5400s

I not eddy-resolving

ACCESS-OM2-025

I 0.25◦ horizontal grid

I 13.9–6.0 km below 60S

I 50 levels

I fairly fast, less cheap< 60min/yr on 1960 PEs, dt=1800s

I eddy permitting

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I 0.1◦ horizontal grid

I 5.6–2.2 km below 60S

I 75 levels

I slow, expensive17–24hr/yr on 5559 PEs, dt=450s

I eddy resolving

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Arctic sea ice thickness at 1◦ (Laptev & Beaufort Seas)

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Arctic sea ice thickness at 0.25◦ (Laptev & Beaufort Seas)

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Runs to dateACCESS-OM2 (1◦)

I Many multi-century experiments undertaken

ACCESS-OM2-025 (0.25◦)

I Multiple few-century spinups completed

I Investigating role of Gent-McWilliams and Redi parameterisations at 0.25◦

ACCESS-OM2-01 (0.1◦)

I 40-year spinup under 1984–5 repeat-year forcing

I Interannual run, 1985–2007 (so far)

I New run starting in 1958 planned

All output data (over 100Tb) is available on NCI

I Access from /g/data3/hh5/tmp/cosima via COSIMA Cookbook

I To be published with DOI soon

I Request any additional diagnostics you need

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Surface current speed vs. drifter obs.

top left: 1979 – 2015 mean from drifters obs at 15 m (Laurindo et al., 2017)others: ACCESS-OM2 10-year mean surface current at 1◦, 0.25◦, 0.1◦

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Overturning streamfunction

Time-mean zonally-integrated overturning circulation on density surfaces

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ACC barotropic transport

ACCESS-OM2-01 10-year mean137 Sv at Drake Passage

Obs (WOA & Argo): 175 Sv at DPColin de Verdiere & Ollitrault, JPO 2016

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September ice concentration vs. obs.

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February ice concentration vs. obs.

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Summary

I ACCESS-OM2 suite is a global coupled ice-ocean model at 1◦, 0.25◦, 0.1◦

I Configurations are running; model assessment underway; paper in prep.

I Code, configurations, inputs and outputs are publicly available

I The ACCESS-OM2 suite is a national resource for ocean and sea iceresearch from regional to global scales and operational to climate timescales— contact us if you’re interested!

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Questions?

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Equatorial Pacific 10-year mean temperature & eastward velocity

Across equator at 140W:

thanks to Fanghua Wu

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Horizontal resolution (km)

Global North of 60◦N South of 60◦Smin median max min median max min median max

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23.8 91.7 111.2 24.7 32.7 54.8 23.8 43.0 54.6

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15.4 51.4 111.2 15.4 47.4 56.6 23.8 43.0 54.6

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025 dx

6.0 18.1 27.8 6.2 8.1 13.9 6.0 11.3 13.9

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025 dy

6.0 18.1 27.8 6.0 11.1 13.9 6.0 11.3 13.9

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2.2 7.2 11.1 2.5 3.3 5.6 2.2 4.5 5.6

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0.9 7.2 11.1 0.9 4.4 5.6 2.2 4.5 5.6

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Prescribed atmospheric forcing

Japanese Reanalysis JRA55-do (Tsujino et al., 2018)

I 1958–2018

I 3-hourly, 0.5625◦ liquid and solid precipitation, downwelling longwave andshortwave, sea level pressure, air velocity, humidity and temperature

I Runoff from Antarctica is replaced by climatological runoff (Depoorter etal., 2013), currently deposited at the ice shelf edge

ACCESS-OM2-01, a global 0.1-degree ocean-sea ice model for...

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