Gulf of Carpentaria salinity issues

[kieranricardo]

No description provided.

[ofa001]

@kieranricardo @MartinDix, I only found your run that was 2 years in that was still running this week. Its salinity on the east side of the Gulf of Carpentaria after 24 months of simulations was 36.6. which looked like it should have been at a river mouth.

In The CM2 pi Control after 1440 years in down the East coast of the Gulf, the salinity had increased to a maximum of 37.4, maximum, in the far south were the main river empties into the Gulf and Major flooding often seen (on TV) during the Wet season.

The models are being run with different topography set ups as was seen in the Red Sea, In CM2 the top 5 layers are identical whilst the two layers belw that are a bowl over the Gulf shut off from the shelf. In CM3 there are extra vertical layers and there is an opening to the west in the bowl which is not as deep.

I guess checking the different precip in the CM2 model v GAL9 version is the next step.

[MartinDix]

From cm3-run-18-09-2024-no-zap-no-iceberg as in #32 (comment)

[ofa001]

Hi @MartinDix that definitely does look different from CM2, and I dont think its anything to do with no zapping and no icebergs its the local rivers, and precip and possible the circulation it might be a fraction shallower at that 50point as well more like 40m v 50m everywhere in CM2 5* 10m layers.

[kieranricardo]

Comparing the first 10yrs of CM2 to CM3 over that region (average over the plotted region), it looks like:

• CM3 is getting half the precipitation of CM2 (2.5e-5 kg/m^2 vs 5e-5 kg/m^2)
• Evaporation is about the same: (6.4e-5 kg/m^2 vs 6.5e-5 kg/m^2)
• Run off is about the same: (4.5e-6 kg/m^2 vs 4.76 e-5 kg/m^2)

CM3 10yr average net water flux: -3.1222542e-05 kg/ms^2
CM2 10yr average net water flux: -1.4122122e-05 kg/ms^2

Precipitation plot

Net water flux plot