Databases Galore - 12

Fig. 1

The GISS data on Antarctica was sparse like much of the data from that hostile region.

There aren't even any PSMSL tide gauge stations there.

I finally was able to use the data for all zones combined.

So the graphs (Fig. 1 - Fig. 4) are old in the sense that they only go up to a decade ago, or less.

The big take away is that the sub-surface ocean water, during the times covered, gets above freezing.

The glaciologists I quote here on Dredd Blog indicate that the sub-surface ice will melt when the water temperature is at or near 0 deg. C, 32 deg. F.

Fig. 2

Fig. 3

Other data that will have to be used to fill in the gap from the time the GISS data ends until the present.

That data will have to be the ARGO and AMA data (ARGO Southern Ocean, Antarctic Ocean, AMA same).

Fig. 4

So, I am looking at that data again, although I do not like the "netcdf" data format they use.

Mainly because last time I checked the tools for extracting it were kept close to their vests (perhaps they have a commercial streak in them).

Anyway, I am checking out the status of those sources again, because it has been a year or so since I took a look at ARGO.

The ARGO robotic buoys are quite far away from the coast (Buoy/Float Map).

The closest ARGO float seems to be the 1901251 Argo Profiling Float operated by Britain.

Fig. 5 (Zones bq,br,bm,bn,bo,bq)

Fig. 6  (Zones bq,br,bm,bn,bo,bq)

UPDATE: The ARGO system is still inadequate, because the floats are too far away from Antarctica.

So, I took another look at the same GISS database.

I limited the inquiry to ocean temperatures above 0 deg. C (32 deg. F).

Any water temperature above 0 deg. C (32 deg. F) will tend to cause ice shelves and ice sheets to melt when and where that water contacts the ice.

I made two graphs to help visualize what has been going on down there under the Southern Ocean (a.k.a. Antarctic Ocean).

The graph @ Fig. 5 shows ocean temperatures from 0C (32 F) to 2.4C (36.32 F) at depths from 0m (surface) to 800m (2,625 ft) deep.

Note that the warmest water is at about the 400m (1,300 ft) depth.

The graph @ Fig. 6 shows the high temperature for each year from 1964 to 2006.

What these graphs show is that water warm enough to melt subsurface ice has been around Antarctica for a long time.

To fill in the gap from 2006 to the most recent, one can read some scientific papers published on the subject.

Papers which indicate that warmer water at about the 400m subsurface mark is still melting glaciers in Antarctica:

Warm modified Circumpolar Deep Water, which has been linked to glacier retreat in West Antarctica, has been observed in summer and winter on the nearby continental shelf beneath 400 to 500 m of cool Antarctic Surface Water [even in E. Antarctica].

(Nature). Thus, we can conclude that the beat goes on (Why Sea Level Rise May Be The Greatest Threat To Civilization - 3).

The previous post in this series is here.

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