Thursday, December 14, 2017

Oceans: Abstract Values vs. Measured Values - 6

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Fig. 6
This is a quick update concerning the previous post discussing WOD measurements possibly being outside the maximum / minimum parameters of Appendix 11 in the WOD User Manual (Oceans: Abstract Values vs. Measured Values - 5).

The post showed thermosteric sea level changes that were out side those boundaries, so I began to look into the matter.

The graphs posted (Fig. 1 - Fig. 6) show that WOD in situ temperature measurements are not the problem.

All of the various in situ measurements, TEOS Conservative Temperature (CT) calculations, and Abstract maximum / minimums calculations show that the WOD measurements are within bounds.

It remains to be seen what the problem with the thermosteric sea level changes that were out of bounds is caused by.

I am still researching the issue to determine if it is a TEOS or Dredd Blog bug concerning thermosteric volume calculations.

I will update this series accordingly when I know more.

I moved things around in Fig. 1 so you can see the colors of the Abstract Maximum / Minimum lines (the long ones from 1880 - 2016).

The WOD in situ and CT lines are short red and black lines spanning 1968 - 2016 (right hand side of the graphs).

The Abstract maximum and minimum abstract CT lines are greenish, while the middle (average) abstract CT line is blue.

As you can see, the various configurations of layers and zones are reasonably within the confines of the maximum / minimum ranges.

The salinity measurements were out of bounds (higher than the maximum) so I am checking that out prior to posting the Absolute Salinity graphs.

I am checking the source code closely to see if there is a logical error that would make the salinity go out of bounds.

Even though I doubt that a two or three g/kg value above the maximum, which is what the salinity is showing, would cause the sea level gyrations in the previous post, I am looking closely at all of that.

I suspect that it is more likely to be a TEOS issue, because both the thermosteric volume and the thermosteric sea level gyrations are related.

The next post in this series is here, the previous post in this series is here.

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