Potential temperature

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  • Potential Temperature
definition
  • Measurement of water temperature taking water's compressibility into account, provided no heat exchange of the water sample with its surroundings. This is important because water temperature is higher under the higher pressure conditions of the deep ocean compared to the temperature of that same water at the lower pressure conditions of the ocean surface.  
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Abstract from DBPedia
    The potential temperature of a parcel of fluid at pressure is the temperature that the parcel would attain if adiabatically brought to a standard reference pressure , usually 1,000 hPa (1,000 mb). The potential temperature is denoted and, for a gas well-approximated as ideal, is given by where is the current absolute temperature (in K) of the parcel, is the gas constant of air, and is the specific heat capacity at a constant pressure. for air (meteorology). The reference point for potential temperature in the ocean is usually at the ocean's surface which has a water pressure of 0 dbar. The potential temperature in the ocean doesn't account for the varying heat capacities of seawater, therefore it is not a conservative measure of heat content. Graphical representation of potential temperature will always be less than the actual temperature line in a temperature vs depth graph.

    温位(おんい、英語: potential temperature)とは、気圧、温度の空気塊を圧力 hPaに断熱変化させたときの温度のことである。 温位をとすると、 (は気体定数、は定圧比熱) として表される。

    (Source: http://dbpedia.org/resource/Potential_temperature)

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