Hi Jon,
Oxygen temperature sensors measure the temperature of the membrane inside the oxygen sensor, which is the best number for computation of oxygen concentration from current. This has significant thermal inertia so when the CTD is travelling at about 1 m/s through the water column it lags behind the true water tyemperature.
The same problem is encountered with thermosalinoigraphs. These record conductivity plus two temperatures, one at the ship's hull (ambient sea temperature) plus one in the conductivity cell used to compute salinity (ambient laboratory temperature!).
When we've hit this type of thing before, the response has been that the accessory parameters shouldn't be given standard names, but the way the oceanographic community is going the standard name is becoming mandatory. This is an unresolved issue that needs resolving.
Cheers, Roy.
>>> Jonathan Gregory <j.m.gregory at reading.ac.uk> 02/23/06 9:12 PM >>>
Dear Nan
> Is there a recommentdation for naming secondary parameters,
> for example the water temperature returned by an oxygen sensor?
I don't recall a discussion previously about this.
> It would be a mistake to call this sea_water_temperature
> and risk having it used as a valid temp.
Why would it be a mistake? Is it not a correct temperature? In general I
suppose distinctions about how a quantity is measured ought to be made by
other attributes than the standard name. We could do more work on this.
> By the way, it would be really useful if there *were* a
> search on the email archive, or even a web page concatenating
> it all
The archive page for the email list
http://www.cgd.ucar.edu/pipermail/cf-metadata/
does allow you to download each year separately as a plain text file.
Best wishes
Jonathan
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Received on Fri Feb 24 2006 - 01:08:55 GMT
