>
>
>In principle temperature from a TSG should probably be reported as SSTz but the z is debatable. For example, most ships have seawater intake pipes between 3-20m but the location of the TSG relative to the intake differs on almost every ship. It's possible that the fluid will flow through pipes in the engine room for a minute before reaching the sensor, during which time it is usually heating. To address this issue, we've begun installing remote temperature sensors designed to be nearer to the intake.
>
In the case of a water temperature that is ONLY of use for the salinity
calculation, I'd want to see the same scheme used that we settled on for
the
water temperature of the oxygen sensor, just replacing the sensor name:
"Temperature_of_sensor_for_oxygen_in_sea_water is the instrument
temperature used in calculating the concentration of oxygen in sea
water; it is not a measurement of the ambient water temperature."
This would make it unlikely that your TSG measurements would be misused;
the depth
value should still be the intake depth, since that defines the position
at which the
water for the salinity measurement was taken.
If you apply a bias to make the TSG temperature reflect the external
temperature,
that's a different story. In that case, or for the remote temperature,
you'd report
the nominal (because changing) depth of the intake. For our underway
temperatures,
whether scaled or remote, we don't use SST, we use
sea_water_temperature, because
of this definition:
"For the temperature of sea water at a particular depth or layer, a data
variable
of sea_water_temperature with a vertical coordinate axis should be used."
Cheers - Nan
--
**************************************************************
* Nan Galbraith Upper Ocean Processes Group *
* Woods Hole Oceanographic Institution Woods Hole, MA 02540 *
* http://uop.whoi.edu (508) 289-2444 *
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Received on Wed Aug 15 2007 - 13:21:36 BST
