HiGEM Ocean Surface boundary condition Freshwater balance

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Presentation transcript:

HiGEM Ocean Surface boundary condition Freshwater balance Initial conditions HiGEM 1.3 ? Bug fixes

Ocean volume conservation HadGEM HiGEM

SODA (Simple Ocean Data Assimilation) Reanalysis of ocean circulation using Parallel Ocean Program (POP) 2.1 code Global 0.25 X 0.4 degree, 40 levels, displaced pole grid Forced by ECMWF ERA-40 winds, GPCP surface freshwater flux, observed monthly sea ice Assimilates hydrography (Levitus 2001 MBTs, XBTs,CTDs, floats,moored thermistor chains), in-situ and satellite SSTs Output are monthly mean T, S, U, V, SSH on a 0.5 X 0.5 degree lat-long 40 level grid Data available for 1958-2001 using ERA-40 winds and 2000-2004 using QuikSCAT Carton and Giese, U. Maryland and Texas A&M

SODA Ocean start dump

SODA in HadGEM Nino indicies

SODA in HiGOM Atlantic MOC

Ocean errors in HiGEM1.2 - possible fixes SH sea ice loss - ocean vertical mixing and GM Subsurface warming - subduction within gyres, large scale wind stress, horizontal viscosity and too large diapycnal mixing Florida Current transport - sensitivity to horizontal viscosity Position of NAC and N. Atlantic SST errors - partial cells and horizontal viscosity ACC transport - zonal wind stress, SH sea ice loss, GM and ocean depth Surface boundary condition on freshwater flux Bug fixes - upwind advection scheme and sublimation from sea ice

Heatsink at ocean floor (W/m2) xbylr annual mean year 10