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Cool SST bias #78

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@kieranricardo

Despite a net positive heat flux into the ocean, the SST cools, increasing the TOA radiative imbalance.

Net heat flux from the coupler into the ocean is positive, but net heat from the coupler to the surface ocean layer is negative, with some heat flux entering as penetrating shortwave. Insufficient heath is transported/mixed from to the surface layer, leading to an overall cooling of the ocean surface.

Unsure what's exactly causing the surface cooling, but the ocean is warming below ~180m due to vertical advection.

Image

Looking at depth integrated regions, it looks like almost all the heat from penetrating shortwave 69.7m to 186.1 m is transported to 206.6m to 517.6 m.

Coupler:
0.5m to 0.5 m heat change: -88.652 W/m^2
1.7m to 16.4 m heat change: 65.691 W/m^2
19.2m to 62.1 m heat change: 20.739 W/m^2
69.7m to 186.1 m heat change: 3.590 W/m^2
206.6m to 517.6 m heat change: 0.036 W/m^2
571.6m to 1333.1 m heat change: 0.000 W/m^2
1453.4m to 2834.1 m heat change: -0.000 W/m^2
3012.6m to 4722.5 m heat change: 0.000 W/m^2
4918.8m to 5709.4 m heat change: 0.000 W/m^2

Vertical advection (remap):
0.5m to 0.5 m heat change: 3.421 W/m^2
1.7m to 16.4 m heat change: 20.463 W/m^2
19.2m to 62.1 m heat change: -23.240 W/m^2
69.7m to 186.1 m heat change: -7.400 W/m^2
206.6m to 517.6 m heat change: 3.471 W/m^2
571.6m to 1333.1 m heat change: 1.401 W/m^2
1453.4m to 2834.1 m heat change: 0.151 W/m^2
3012.6m to 4722.5 m heat change: 0.316 W/m^2
4918.8m to 5709.4 m heat change: 16.700 W/m^2

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