Dear Jonathan's W & G,
I would contend that in models "surface_temperature" is the radiating
temperature of the surface and therefore the same as the "skin
temperature". I'm wondering why we need to distinguish between surface
temperature and surface skin temperature. I think users looking for
surface_temperature should find any measurement of the radiating
temperature of the surface.
Karl
On 6/10/13 8:52 AM, Jonathan Wrotny wrote:
> Dear Jonathan Gregory,
>
> I have not yet replied to this e-mail yet from you...thanks for the
> information on the meaning of the various surface temperatures.
>
> Yes, the land skin temperature is actually different from the
> "surface_temperature" standard name since it corresponds to the skin,
> and not the interface, temperature. So, I do believe that an
> additional name will need to be added to account for this land
> analogue to "sea_surface_skin_temperature." Here is my current proposal:
>
> Standard Name: land_surface_skin_temperature
>
> Definition:The surface called "surface" means the lower boundary of
> the atmosphere. The land surface skin temperature is the temperature
> measured by an infrared radiometer, but measurements from microwave
> radiometers operating at GHz wavelengths also exist. It represents the
> aggregate temperature of the skin surface where "skin" means the
> surface medium viewed by a sensor to a vertical depth of approximately
> 12 micrometers.
>
> Measurements of this quantity are subject to a large potential diurnal
> cycle which is primarily due to the balance between heating during the
> day by solar radiation and continual cooling from terrestrial
> (long-wave) radiation emitted by the skin surface.
>
> Canonical Units:K
>
>
> Sincerely,
>
> Jonathan
>
> On 6/7/2013 3:47 AM, Jonathan Gregory wrote:
>> Dear Jonathan W
>>
>>> If my interpretation of all of the surface temperature names is
>>> correct, then there may need to be a modification to the current
>>> definition of "sea_surface_temperature." In particular, this
>>> definition states "It is the temperature of sea water near the
>>> surface (including the part under sea-ice, if any), and not the skin
>>> temperature, whose standard name is surface_temperature." However,
>>> it seems to me that the "surface_temperature" is the
>>> atmosphere/medium interface temperature, and not the temperature of
>>> the medium below the interface (e.g. the skin temperature). So, I'm
>>> wondering if the above sentence in quotes incorrectly refers to the
>>> "surface_temperature" when perhaps it should refer to the
>>> "sea_surface_skin_temperature"?
>> Yes, I think you are right. This definition of sea_surface_temperature may
>> predate the introduction of sea_surface_skin_temperature. The SST is neither
>> the true interface temperature (for which the name is surface_temperature) nor
>> the "skin" temperature, but a bulk temperature applying to a rather ill-defined
>> upper layer of the ocean. There isn't a land analogue for SST.
>>
>> If land skin temperature is different from surface_temperature of the
>> interface, a new name is needed for it, I agree.
>>
>> Cheers
>>
>> Jonathan
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>
>
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Received on Mon Jun 10 2013 - 10:10:35 BST
