Daily Archives: January 13, 2017

attp

angech says:

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Victor Venema (@VariabilityBlog) says:
” It is much easier to measure the temperature of the ocean than the temperature or the air over land. Water is a good conductor, thus the temperature of the thermometer is the temperature of the water. Over land it is easy for the temperature of the thermometer to be different because air is a good isolator.”
?
Not sure what you mean.
A thermometer heats to the temperature of the medium it is in. It measures the heat of the medium it is in. If the medium has energy this must transfer to the thermometer. The conductivity might slow or hasten changes in heat moving through the medium but will not effect the temperature being measured at the at the measuring site itself.
Offhand I would say the temperature of the thermometer is always at or very close to and trying to reach the temperature of the medium it is in.
Perhaps you meant changes in temperature.
“The temperature of the water is a very smooth field, over land changing the position of the thermometer or its screen can have large effects, in the ocean it does not”.
In Ocean Acoustic Tomography at Wiki it states
The fact is that currents in water have a much greater effect on rate of change in temperature.
measurements by thermometers (i.e., moored thermistors or Argo drifting floats) have to contend with this 1-2 °C noise, so that large numbers of instruments are required to obtain an accurate measure of average temperature.The ubiquitous small-scale turbulent and internal-wave features of the ocean usually dominate the signals in measurements at single points.
I think this contrasts with your claims.
Windchaser says: January 12, 2017 at 5:14 am
“Angech, are you familiar with the Law of Large Numbers?”
“Yes, I’m not that innocent;(grin)” You and ATTP are right for large numbers. I would contend that ARGO in particular has far too few floats too give meaningful results. It is not suitable for a Law of Large Numbers application.\

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verytallguy says:    January 13, 2017 at 8:39 am
“The thermometer measures nothing other than the temperature of itself.
In air, heat transfer is slow, and radiation may be significant.heat transfer is rapid and unconfounded by radiation in water.”
Thermometers measure the heat of the air and the water at the time said medium is in contact with the thermometer. They do not care about how the medium is being heated, slowly or quickly, just how hot it actually is.
not how quickly or slowly the water or air is heated.
Radiation through or not through a medium is also irrelevant. The thermometer is designed to measure the mediums temperature without the radiation. That is why there is a screen for air temperatures.