High Resolution Global Ocean Model

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Presentation transcript:

High Resolution Global Ocean Model on Earth Simulator By Norikazu Nakashiki (CRIEPI) Yoshikatsu Yoshida (CRIEPI)　　　　 Frank O. Bryan 　 (NCAR) Richard D. Smith 　(LANL)

Earth Simulator High Resolution Global Ocean Model (POP) on ES Super High Resolution Global Ocean Model (ocean stand alone) 　Resolution　　 : 10km x 10km x 40 Level (3600x2400x40) (Pole is shifted on North America) 　Horizontal mixing : Bi-harmonic Mixing　(velocity, temp. sal.） Vertical mixing : Kpp Mixing Time step for integration : 220/day (≒ 6min.) Earth Simulator Fine ・Effect of variability 　（Kuroshio, etc）・Short term Spatial resolution Eddy Resolving Model Direct Meso-scale Eddy Spatial scale : O(10km)～ O(100km) Parameterize Eddy Permitting Model Moderate Resolution Global Ocean Model （climate model：atm.-ocean coupled model）　Resolution : 100km x 100km x 40 Level (320x384x40) 　　　　　　　　　　　　　　　 (Pole is shifted on Green Land) 　 Horizontal mixing : An Isotropic Mixing （velocity）、　　　　　　　　　　　　　　　　 GM Mixing （temp. sal.）　 Vertical mixing : Kpp Mixing 　 Time step for integration : 23/day (≒60min.) Coerce ・Change of mean characteristics ・Long Period　

POP performance on ES (a) wallclock v.s. # of PEs (b) efficiency v.s. # of PEs 1.64 day/century, 70.2 Gflop/s, at 1 degree (4 nodes) 27.1 day/century, 1.60 Tflop/s, at 0.1 degree (120 nodes)

Computed Kuroshio (Annual Mean ) resolution　x1deg resolution　x0.1deg resolution　x0.1deg resolution　x0.1deg

Meridional Heat Transport & Pacific Intermediate Water

Computation on Earth Simulator in FY2003 Computation on Earth Simulator in FY2003 Case Surface B.C. Mixing Scheme Integration Memo Horizontal Vertical FY 2 2 01c Monthly Climatology NCEP(1985-1988) Velocity Bi-harmonic ( am = -0.9e１８ cm２/s ) Tracer (temp. sal.) ( ah = -3.0e１７ cm２/s)　 KPP 20 yr Basic case for sensitivity analysis 01d ( am = -2.7e１８ cm２/s ) GM scheme 15 yr Change Horizontal mixing 3 01g Same as 01c 15yr Weak SFW Flux restoring 02a 2 yr w/ 106L 03c North Atlantic restoring 03g Anisotropic visc. Anisotropic GM horizontal mixing 03i Change topo. ETOPO -> SKKU

Vertical High Resolution w/ 106 L 40 level vs. 106 level

Meridional Section at Eq. Area W/ 40L W/ 40L W/ 106L W/ 106L

Zonal Section near Nansei Islands Northward Velocity at 26.7N Northward Velocity at 27.3N W/ 40L W/ 106L W/ 40L W/ 106L

Current & Front around Japan KR: Kuroshio KF: Kuroshio Front KRE: Kuroshio Extension KCC: Kuroshio Counter Current OY: Oyashio OF: Oyashio Front STCC: Sub-tropical Counter Current STF: Sub-tropical Front NEC: North Equatorial Current TS: Tsushima Current TG: Tsugaru Current SY: Soya Current EK: East Korea Current LM: Liman Current W: Warm Eddy Encyclopedia of Oceanography, Ed. Wadachi

Effect of Horizontal Mixing 01c Vel. 　　: Biharmonic Tracer　: Biharmonic 03g Vel : Anisotropic Visc. Tracer　: Anisotropic GM ② front, warm/cold eddy ④steady eddy ① meandering KE at surface ③1st branch of Tsushima current

Effect of Bottom Topography SKKU Blue →redused Red→enhanced ETOPO SKKU-ETOPO

Kuroshio Japan Sea Volume Transport around Japan (by ETOPO) Izu SST (℃) Soya Volume Transport at Kuroshio (Sv) Tsushima Tsugaru Izu 30-60 Sv　 Kuroshio Tokara 13 Sv Izu Tokara Year Japan Sea Volume Transport in Japan sea (Sv) Tsushima　2.2Sv Tsugaru　1.5Sv Soya　0.7Sv Year

Volume Transport around Japan (by SKKU) Izu 30-60 Sv　 Izu Tokara 13 Sv Tsushima　2.2Sv Tsushima　 Tsugaru　1.5Sv Soya　0.7Sv

Weak Restoring of Surface Flux Surface Heat Flux Surface Fresh Water Flux Bulk-NCEP Restoring

Global Diagnostics (01g) branch Global Diagnostics (01g)

Base case GM Weak SFWF Aniso GM & visc.

Weak SFWF x1deg Aniso GM & visc. GM

1st. phase 2nd. phase J “Kyousei” project (ocean part) FY2002 FY2003 FY2004 FY2005 FY2006 22node 17-18 yrs/day IPCC Run Prediction of Global Warming Feb. ? Sept. ? 20 ? model year High Res. Global Ocean Model (Regional Impact of Global Warming) 50 ? model year J High Res. Atm-Ocean model

Regional Impact Study by High Resolution Global Ocean Model Global prediction (IPCC Run) CCSM2.0 Boundary Conditions Ice　ＣＳＩＭｘ１ Regional effect　(Local & Snapshot) Atm. x1 Flux Coupler Ice Model CSIM4 (x0.1) Land Data Atmosphere Air Density Specific Humidity Sea Level Pressure Air Temperature U Wind, V Wind Precipitation Cloud Fraction Ocean　POP x1 Flux Coupler (CPL6) Data Land Runoff Ocean Model POP1 (x0.1, 40L) Vector/parallel optimization will be finished soon.