Hi Alison: Thanks for this - your modifications are fine and thanks for the help with this, Take care Craig
2008/5/9 Pamment, JA (Alison) <[EMAIL PROTECTED]>: > Dear Craig, > > Thanks for your reply. I too am very pleased that agreement has been > reached. > > I think your descriptions of sea_surface_skin_temperature and > sea_surface_subskin_temperature are fine and can go into the table without > further modification. > > The explanation of sea_surface_foundation_temperature is necessarily rather > more complex than those of the other quantities (in fact, I think it has the > longest description of any name in the table!). Many thanks for reviewing > it with the GHRSST team. I agree that your version is clearer and has a > more logical ordering of the information, which first establishes the > definition of the physical quantity before discussing measurement techniques > and relationships to other SST quantities. In the following I have > suggested two or three further modifications, which I hope you agree are > small and aimed at enhancing clarity and readability, rather than > substantively altering the content. > > sea_surface_foundation_temperature > The surface called "surface" is defined as the lower boundary of the > atmosphere. The sea surface foundation temperature is the water temperature > that is not influenced by a thermally stratified layer of diurnal > temperature variability (either by daytime warming or nocturnal cooling). > The foundation temperature is named to indicate that it is the temperature > from which the growth of the diurnal thermocline develops each day, noting > that on some occasions with a deep mixed layer there is no clear foundation > temperature in the surface layer. In general, sea surface foundation > temperature will be similar to a night time minimum or pre-dawn value at > depths of between approximately 1 and 5 meters. In the absence of any > diurnal signal, the foundation temperature is considered equivalent to the > quantity with standard name sea_surface_subskin_temperature. The sea surface > foundation temperature defines a level in the upper water column that varies > in depth, space, and time depending on the local balance between thermal > stratification and turbulent energy and is expected to change slowly over > the course of a day. If possible, a data variable with the standard name > sea_surface_foundation_temperature should be used with a scalar vertical > coordinate variable to specify the depth of the foundation level. > > Sea surface foundation temperature is measured at the base of the diurnal > thermocline or as close to the water surface as possible in the absence of > thermal stratification. Only in situ contact thermometry is able to measure > the sea surface foundation temperature. Analysis procedures must be used to > estimate sea surface foundation temperature value from radiometric satellite > measurements of the quantities with standard names > sea_surface_skin_temperature and sea_surface_subskin_temperature. Sea > surface foundation temperature provides a connection with the historical > concept of a "bulk" sea surface temperature considered representative of the > oceanic mixed layer temperature that is typically represented by any sea > temperature measurement within the upper ocean over a depth range of 1 to > approximately 20 meters. The general term, "bulk" sea surface temperature, > has the standard name sea_surface_temperature with no associated vertical > coordinate axis. Sea surface foundation temperature provides a more precise, > well-defined quantity than "bulk" sea surface temperature and, consequently, > is more representative of the mixed layer temperature. The temperature of > sea water at a particular depth (other than the foundation level) should be > reported using the standard name sea_water_temperature and, wherever > possible, supplying a vertical coordinate axis or scalar coordinate > variable. > > Best wishes, > Alison > > > > Hello Alison and everyone: > > > > There are several GHRSST-PP science Team members and Oceanographers > > with me at the WMO CLIMAR-III Conference in Poland this week and we > > have reviewed the descriptive text you have prepared for the SST > > standard names. We agree with the standard names. We agree with the > > definitions you have but propose a revised text which we believe is a > > little clearer. I hope that you find this aceptable and thank you for > > all your effort and support over the last 10 months or so. I am > > extremely pleased that we have reached a conclusion and we will finally > > enter the CF namespace > > > > Take care > > Craig > > > > Standard names: > > surface_temperature > > sea_water_temperature (for temperatures at depth) > > sea_surface_skin_temperature > > sea_surface_subskin_temperature > > sea_surface_foundation_temperature > > Description for standard names > > sea_surface_skin_temperature: > > The surface called "surface" defines the lower boundary of the > > atmosphere. The sea surface skin temperature is the temperature > > measured by an infrared radiometer typically operating at wavelengths > > in the range 3.7 - 12 micrometers. It represents the temperature within > > the conductive diffusion-dominated sub-layer at a depth of > > approximately 10 - 20 micrometers below the air-sea interface. > > Measurements of this quantity are subject to a large potential diurnal > > cycle including cool skin layer effects (especially at night under > > clear skies and low wind speed conditions) and warm layer effects in > > the daytime. > > > > sea_surface_subskin_temperature: > > The surface called "surface" defines the lower boundary of the > > atmosphere. The sea surface subskin temperature is the temperature at > > the base of the conductive laminar sub-layer of the ocean surface, that > > is, at a depth of approximately 1 - 1.5 millimetres below the air-sea > > interface. For practical purposes, this quantity can be well > > approximated to the measurement of surface temperature by a microwave > > radiometer operating in the 6 - 11 gigahertz frequency range, but the > > relationship is neither direct nor invariant to changing physical > > conditions or to the specific geometry of the microwave measurements. > > Measurements of this quantity are subject to a large potential diurnal > > cycle due to thermal stratification of the upper ocean layer in low > > wind speed high solar irradiance conditions.. > > > > sea_surface_foundation_temperature: > > The surface called "surface" is defined as the lower boundary of the > > atmosphere. The sea surface foundation temperature is the water > > temperature that is not influenced by a thermally stratified layer of > > diurnal temperature variability (either by daytime warming or nocturnal > > cooling). The foundation temperature is named to indicate that it is > > the temperature from which the growth of the diurnal thermocline > > develops each day, noting that on some occasions with a deep mixed > > layer there is no clear foundation temperature in the surface layer. In > > general, sea surface foundation temperature will be similar to a night > > time minimum or pre-dawn value at depths of between approximately 1 and > > 5 meters. In the absence of any diurnal signal, the foundation > > temperature is considered equivalent to the quantity with standard name > > sea_surface_subskin_temperature. The sea surface foundation temperature > > defines a level in the upper water column that varies in depth, space, > > and time depending on the local balance between thermal stratification > > and turbulent energy and is expected to change slowly over the course > > of a day. If possible, sea_surface_foundation_temperature should use a > > data variable with a vertical coordinate axis to specify the depth of > > the foundation level. > > Sea surface foundation temperature is measured at the base of the > > diurnal thermocline or as close to the water surface as possible in the > > absence of thermal stratification. Only in situ contact thermometry is > > able to measure the sea surface foundation temperature (reporting the > > temperature of sea water at a particular depth using the standard name > > sea_water_temperature and when possible including a data variable with > > a vertical coordinate axis). Analysis procedures must be used to > > estimate sea surface foundation temperature value from radiometric > > satellite measurements of the quantities with standard names > > sea_surface_skin_temperature and sea_surface_subskin_temperature. Sea > > surface foundation temperature provides a connection with the > > historical concept of a "bulk" sea surface temperature considered > > representative of the oceanic mixed layer temperature that is typically > > represented by any sea temperature measurement within the upper ocean > > over a depth range of 1 to approximately 20 meters. The general term > > "bulk" SST is linked to the standard name sea_surface_temperature > > without a vertical coordinate axis. Sea surface foundation temperature > > provides a more precise, well-defined quantity than "bulk" SST and, > > consequently, is more representative of the mixed layer temperature. > > > > -- > > Dr Craig Donlon > > Director of the International GODAE SST Pilot Project Office > > Met Office Hadley Centre, > > Fitzroy Road, Exeter, EX1 3PB United Kingdom > > > > Tel: +44 (0)1392 886622 Mob:07920 235750 > > Fax:+44 (0)1392 885681 > > Skype ID:crazit > > SkypeIn: +44 0141 416 0882 > > E-mail: [EMAIL PROTECTED] > > http://www.ghrsst-pp.org > > ------ > Alison Pamment Tel: +44 1235 778065 > NCAS/British Atmospheric Data Centre Fax: +44 1235 446314 > Rutherford Appleton Laboratory Email: [EMAIL PROTECTED] > Chilton, Didcot, OX11 0QX, U.K. > -- Dr Craig Donlon Director of the International GODAE SST Pilot Project Office Met Office Hadley Centre, Fitzroy Road, Exeter, EX1 3PB United Kingdom Tel: +44 (0)1392 886622 Mob:07920 235750 Fax:+44 (0)1392 885681 Skype ID:crazit SkypeIn: +44 0141 416 0882 E-mail: [EMAIL PROTECTED] http://www.ghrsst-pp.org
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