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[wghuneke]

Suggested figures that go into paper. Add example figure, short description, suggestions for panels/what needs to be changed...

[adele-morrison]

Yes agreed, a comment like “sea ice processes are responsible for x% of the change in freshwater flux” would be fine instead of showing on the plot. Thanks for showing though Andy!

On Sun, Nov 7, 2021 at 1:13 PM, Matthew England @.***> wrote:

Thanks Andy. I think if it’s that similar it can also just be noted in the caption / ms text.

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[AndyHoggANU]

Yep, that works. I will calculate the percentage.

[julia-neme]

First take at figure 8:

It becomes really clear how the increase in DSW comes from the meridional component of the wind!!

[adele-morrison]

Yeah, that's great! Does this have any smoothing applied to it yet? I would argue for removing some of the seasonality on the DSW export lower plot.

On Mon, 8 Nov 2021 at 08:57, Julia Neme @.***> wrote:

First take at figure 8:

[image: figure-8-v1] https://user-images.githubusercontent.com/51519847/140663299-a76fc84c-3c79-4a6d-93d7-307c4f898998.jpg

It becomes really clear how the increase in DSW comes from the meridional component of the wind!!

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[julia-neme]

That one has got 6 month rolling mean, I could do either 12 or annual averages??

[adele-morrison]

Yeah, maybe give them a try, see what it looks like? Alternatively, we could show anomalies for the DSW export (I know we had a discussion on this on Thursday, can't remember if we decided that was a good or bad idea? @AndyHoggANU?), then the seasonality could be removed by subtracting the control climatology.

[julia-neme]

I think we had talk about showing the control as well? Anyways, here are the two options, 12 month running mean and anomalies from control:

[adele-morrison]

I like the 12 month running mean.

[matthew-england-unsw]

Same! :-) PS: interesting to see that the seasonal cycle in DSW anomalies in the WIND+zonal and WIND+meridional cases are ~6 months out of phase, and then approximately cancel out in the total WIND+ case. Could indicate places where zonal winds are cross-shelf I guess. But it's kinda curious that this would be seasonally opposite to the meridional case... ( a side issue of course)

[AndyHoggANU]

Yeah, I see the point, but maybe it is interesting to include the seasonal variation of DSW export -- partly because the meridional and zonal are out of sync!! ANyone else find that interesting?

[matthew-england-unsw]

Haha yes I also saw that and thought it was interesting, see my comment above. :-)

[AndyHoggANU]

OK, if you look at the first draft of figure 8 (not plotted as an anomaly) you can see that what is happening here is that the control has a seasonal peak in summer; this peak is delayed in the zonal wind case and onset earlier in the meridional wind case. So, it might be interesting, but maybe it will be hard to explain succinctly ... so I am now leaning towards saying we should just focus on the 12-month running mean.

[PaulSpence]

Hi Folks, attempt at Fig 6 - calculation of Ekman pumping binned into surface density bins.

I separated the area integration into on shelf, and within perturbation zone off shelf to reveal upwelling in CDW off shelf. The WIND+x and WIND+y are the zonal and meridional wind components of WIND+. Clearly WIND+x dominates the upwelling/downwelling. It is difficult to isolate the upwelling of CDW using surface rho classes since the surface rho changes a lot seasonally and in spatially, as shown below.

[adele-morrison]

Pretty plots Paul! Is something wrong with the WIND+y lines? I'm thinking it should at least be similar to the control (i.e. there should still be upwelling over the open ocean, just no more upwelling perhaps than the control).

Maybe a few north-south transects of temperature with these rho0 isopycnals overlaid would help in identifying on what isopycnal the warm CDW is located?

[PaulSpence]

Re: Is something wrong with the WIND+y lines? I'm thinking it should at least be similar to the control (i.e. there should still be upwelling over the open ocean, just no more upwelling perhaps than the control).

WIND+y is just the dx_tauyf component of WIND+, not the meridional wind perturbation expt. So WIND+x + WIND+y =WIND+

[adele-morrison]

Got it! Sorry!

[wghuneke]

New go on Figure 3 with bottom age and salinity anomalies for WIND+ and WIND-. Figure shows the symmetry between the up and down case and introduces the changes in DSW formation.

I plot the annual average of year 10 (2159), could change the salinity to an average over the last 5 years. (?)

[wghuneke]

Question on Figure 9 on temperature changes: What depth levels and which experiments do we want to show? The temperature response is not really part of the mechanisms we discuss in the paper. The motivation to include a temperature plot was more to inform the community about what all of that means for the temperature and melting...

Here is a go of bottom temperature for the WIND+ and WIND- cases only. Any suggestions?

[adele-morrison]

Looks good. Yeah, I reckon salinity averaged over the last 5 years is good. Perhaps could try enlarging both figures too (e.g. stretch vertical axis of Fig 3, and for Fig 9 put one underneath the other, so they're bigger?).

[PaulSpence]

Some updated Ekman/rho plots for the Amundsen, Denman and Wedell region are here: https://github.com/adele157/easterlies-collaborative-project/issues/20#issuecomment-958479138 Perhaps rho>27.7 for CDW classification?

[matthew-england-unsw]

Question on Figure 9 on temperature changes: What depth levels and which experiments do we want to show? The temperature response is not really part of the mechanisms we discuss in the paper. The motivation to include a temperature plot was more to inform the community about what all of that means for the temperature and melting...

Here is a go of bottom temperature for the WIND+ and WIND- cases only. Any suggestions?

Very nice Wilma! I think surface and bottom temperature responses would be good to plot. Like you said, not because it's core to the mechanism, more for community interest. Not necessarily on same plot either; maybe we want T and S changes for both WIND+ and WIND- on same plot. So one Fig. for surface, one for bottom.

[adele-morrison]

Haha Matt, I was literally writing this at the same time. :)

For the bottom temperature plot, how well can we explain these changes?

The warming regions I think can be easily linked to the changing vertical heat fluxes associated with the change in the lower overturning cell. i.e. Increased winds -> enhancement of lower cell -> warming in upper ocean near and downstream of DSW production regions.

For the cooling (i.e West Antarctica and much of eastern East Antarctica), I'm less sure of the mechanism. I think it may just be that the isopycnals are being pushed down against the coast. It would be interesting to see if this cooling is coming from the zonal, not meridional component of the change. If it is a heaving signal, do we want to show that by plotting a transect somewhere, or calculating the heave component of the temperature change?

[wghuneke]

I prepared the temperature anomaly (at the surface and bottom) figure for WIND+ and WIND-:

• I'm not sure if we need both experiments as there are only very few places where the response is not symmetric (and we show the symmetry throughout the paper, e.g. Fig 3)
• Maybe we can replace the WIND- panels with some figure that explains the cooling response (see Adele's comment above). A transect and/or a map of the depth change of some representative isotherm?
• The bottom salinity is at the moment already shown in Fig 3 which is why I didn't prepared the same figure for salinity. And the surface salinity would be a mirror of the sea ice plot, so maybe not that informative?

[AndyHoggANU]

Here is a revised Fig 8 that I have sent to Julia to review. Others might have comments. If yes, please post them here. Or comment in the pull request. Whatever ...

[julia-neme]

Looks great Andy, thank you! I think we had decided to show 12 month rolling mean though?

[AndyHoggANU]

Oh yeah, you’re right. Well, the code is there now — I just didn’t have time to extend to the other 3 potential versions. Did you want to do that, or should I?

[PaulSpence]

Figure of sea ice velocity and thickness anomalies:

Figure of sea ice transport (volume*velocity) and thickness anomalies:

I think the velocity offers more clarity than the transport.

[adele-morrison]

Yes the transport’s pretty small In the Ross. Thanks for checking! Looks like you got the velocities much smoother too, nice!

On Mon, Nov 22, 2021 at 6:15 PM, Paul Spence @.***> wrote:

Sea Ice Figure of velocity and thickness anomalies: [image: Screen Shot 2021-11-22 at 6 02 22 pm] https://user-images.githubusercontent.com/6644956/142819009-47448e99-539c-4b49-98a8-ed655595cf80.png

Sea Ice Figure of ice ice transport (volume*velocity) and thickness anomalies: [image: Screen Shot 2021-11-22 at 6 12 15 pm] https://user-images.githubusercontent.com/6644956/142819127-5136a274-9a67-4df3-a4ec-792f83ab2f1b.png

I think the velocity offers more clarity than the transport.

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