Adaptation of the vertical resolution in the mixed layer for HYCOM

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Presentation transcript:

Adaptation of the vertical resolution in the mixed layer for HYCOM By Cécile Renaudie (Météo France/SHOM) and Rémy Baraille (SHOM), Yves Morel (SHOM), Gwenaëlle Hello (Météo France), Hervé Giordani (Météo France) June 2009 LOM 2009, Miami, Florida Cécile Renaudie

Initial conditions Profile of temperature at the beginning of the simulation and zoom over the first 200m Representative of a winter stratification in the north eastern Atlantic ocean at mid-latitude 1m resolution Only the forcings, KPP and hybgen are activated June 2009 LOM 2009, Miami, Florida Cécile Renaudie

The problem Difference in SST: 0.3°C! Parameters used to define z-levels in HYCOM : h1 (dp00): minimum thickness of the first layer; hmax (dp00x): z-level spacing maximum thickness; stretch (dp00f): stretching factor. Simulation during 20 days Forcings : - wind=20 m/s; - air temperature=1°C; - net radiative flux=0W/m2 32 hybrid layers h1 =1.01m, hmax =1.41, stretch=1.04 Difference in SST: 0.3°C! The mixed layer is poorly represented June 2009 LOM 2009, Miami, Florida Cécile Renaudie

Solution: Adaptive vertical resolution Determination of the mixed layer depth hmix : depth at which a change from the surface density of 0.025 kg/m3 has occurred. If mixed layer=1 layer, it is extended to the last z-level from the previous time step, Nz=number of z-levels; Calculation of the coefficients : if hmix < 20 m : h1 = 1.01 m, otherwise h1 =3 m. stretch is determined to verify the equation: hmax=500m. Filtering : to avoid strong modifications of the vertical grid and with K=10000s, dt=100s June 2009 LOM 2009, Miami, Florida Cécile Renaudie

Experiments and atmospheric forcings Number of layers Vertical coordinate h1 (m) hmax (m) stretch EXP-REF 4476 z 1.00 EXP-CNA 32 hybrid 1.01 1.41 1.04 EXP-CG 3.00 500. 1.18 EXP-A adaptive Case Air temperature (°C) Wind (m/s) Net radiative flux (W/m2) Short-wave flux (W/m2) Number of days Convective 1 20 50 Wind-mixing 15 200 250 Realistic ARPEGE 366 June 2009 LOM 2009, Miami, Florida Cécile Renaudie

Results for the convective case after 20 days June 2009 LOM 2009, Miami, Florida Cécile Renaudie

Results for the convective case throughout time June 2009 LOM 2009, Miami, Florida Cécile Renaudie

Results for the wind-mixing case after 20 days June 2009 LOM 2009, Miami, Florida Cécile Renaudie

Results for the wind-mixing case throughout time June 2009 LOM 2009, Miami, Florida Cécile Renaudie

The realistic case June 2009 LOM 2009, Miami, Florida Cécile Renaudie

Results for the realistic case throughout time June 2009 LOM 2009, Miami, Florida Cécile Renaudie

PLM/PPM June 2009 LOM 2009, Miami, Florida Cécile Renaudie

Conclusions EXP-CNA : poor representation of the mixed layer as it deepens, growing error in SST and in mixed layer structure; EXP-CG : better solution in convective cases, but not adapted to shallow mixed layers; EXP-A : improves the distribution of geopotential levels in the mixed layer; Still some improvements to make : Sensitivity to mixed layer definition; Sensitivity to the damping rate : it could depend on the forcings; 2 and 3 dimensions : still some problems with boundary conditions. June 2009 LOM 2009, Miami, Florida Cécile Renaudie

First results in 3D EXP-CNA EXP-A 31st May 2005 June 2009 LOM 2009, Miami, Florida Cécile Renaudie

June 2009 LOM 2009, Miami, Florida Cécile Renaudie