Regional High Resolution Reanalysis over European North East Shelf domain
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1 Regional High Resolution Reanalysis over European North East Shelf domain M. Benkiran, E. Greiner (CLS) and Mercator Ocean Team 1
2 Outline REANALYSIS : IBI-1/12, North East Atlantic regional system with tides, The impact of the assimilation of altimeter data Non-filtered, Non-sub-sampled and without the Dynamical Atmospheric Correction ( DAC ) in a model 1/12 degrees (2009). Conclusion and prospects 2
3 IBI-1/12 REANALYSIS IBI-1/ reanalysis: explicit free surface, «time splitting» + Variable volume formulation k-ε : the Generic Length Scale (GLS) formulation (Umlauf and Burchard, 2003) Tides (including potential) : M2, S2, K2, N2, K1, O1, P1, Q1, M4,Mf, Mm Atmospheric pressure forcing Open boundaries from GLORYS2V1 ¼ reanalysis (daily) Data Assimilation: Reduced order Kalman Filter (SEEK formulation) 3D-VAR Bias corrections : for T and S Incremental Analysis Updates (IAU) : Analysis J-2.5 SST Correction in Bulk Quality Control of in situ observation Assimilated Observations: Along track SLA observations From AVISO, usual corrections applied filtering of tides in the Observation Operator H In situ profiles,t & S from CORA3.1 data base Reynolds AVHRR ¼ SST 3
4 IBIRYS1V1 : DIAGS (SLA :J2,J1N, 2009) Misfit = Data Model FCST (Rms Misfit)/(Rms Data) Data Mean Number Misfit Rms Misfit 36 cycles of J2, 26 cycles of J1N
5 Bay of Biscay : TS Diagram Model(2008) vs Clim ( bathy > 200m) FREE RUN REANALYSIS Clim : Blue Line 5
6 Bay of Biscay: TS Diagram Data (CORA3.1) vs Model Forecast ( ), Bathy > 200m ENACW ENACW EASIW MW EASIW MW LDW LSW CORA LDW LSW REANALYSIS LDW : Lower Deep Water LSW : labrador Sea Water EASIW : Eastern Atlantic Sub-arctic Intermediate Water MW : Mediterranean Water ENACW : Eastern North Atlantic Central Water 6
7 MW : Model (monthly: ) vs levitus 2009 model (color) vs Levitus (Contour) ASSIMILATION 7
8 SST : MOD vs L3S L3S (CMS non assimilated, 5x5 Km, Jul-Aug-Sep/2008) Mean bias : SST(CMS) SST(Mod) Warm bias < 0.5 C.5 Free RUN REANALYSIS 8
9 Bay Of Biscay: EKE 09/2009 Intensification of IPC FREE RUN REANALYSIS Currentmeter (non assimilated) vs Model (2.48 W; N) SEP/OCT/NOV/DEC m 620m FREE RUN 9 REANALYSIS
10 Outline REANALYSIS : IBI-1/12, North East Atlantic regional system with tides, The impact of the assimilation of altimeter data Non-filtered, Non-sub-sampled and without the Dynamical Atmospheric Correction ( DAC ) in a model 1/12 degrees (2009). Conclusion and prospects 10
11 OBJECTIVE : TAPAS Sla Data Assimilation TAPAS : Tailored Altimetric Products for Assimilation Systems The Sea Level TAC ( C.Dufau s Poster) Evaluate the impact in IBI-1/12 regional model of the assimilation of alongtrack altimeter SLA Non along-track filtered Non sub-sampled (i.e. 7km instead of 21 Km) Without the high frequency corrections from IBLF and HF wind effect (FSC : Filtered, Sub-sampled and Corrected.) (HF : High Fequency) 11
12 Impact of high frequency data assimilation (Rms Misfit)/(Rms Data) : J2,J1N 2009 (Rms Misfit)/(Rms Data) (Rms Misfit)/(Rms Data) Increase of the misfit in the Irish Sea (may be due to the difference of the tide model used in IBI and data filtering) Reduction of the misfit of the rest of the domain: The western Mediterranean Biascay Bay In the Deep area (Rap<0.4) Mean=0.79 Mean=
13 Impact of high frequency data assimilation Sla Score : J2, 2009 Mean(Misfit) Rms(Misfit )/Rms(Data) Rms(Misfit ) we won a 1 cm Rms (misfit) 13
14 Impact on the scores of insitu data Mean & Rms (Misfit) Temperature No improvement in scores for temperature both Mean and Rms (over all domain) Salinity Slight improvement in both Mean and Rms especially near the surface(0-50m) 14
15 Conclusion & prospects We have good results with a regional model reanalysis, this can be used to force coastal models. Mercator Ocean simulation extended until We have the best scores of assimilation without the correction of the Dac in the model and data. Salinity improvement 0-50 m. Observation error and/or representativeness have to be redefined for this new data. 15
16 16
17 Daily Open Boundary data + Initial condition GLORYS2V1 at Mercator Ocean(1/4 ), 75 levels Obc scheme : 2D : characteritic method (Blayo & al 2005) 3D : 10 points (~60 km) nudging layer with relaxation time scale = 1 day) 17
18 IBIRYS1V1 : DIAGS (SLA) Misfit = Data Model FCST Data Number Impact 7 cm 4 cm 0 cm 02/ /
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