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This icon derives (and returns) a Thermodynamic diagram data unit. In such a diagram, temperature, humidity (represented by the dew point) and wind values are displayed with respect to pressure. There are mainly four different types of thermodynamic diagrams: Tephigram, Skew-T, Emagram and Stuve, but only the Tephigram diagram is currently implemented in Metview.

The Thermo Data icon can be plotted (using a default visualisation and with the plot area based on the range of data values) or saved as a NetCDF data file. The input data types are observation (upper air BUFR) or model field (GRIB) data.

If access to the output computed values is not required, or for more control of the plotting, use the  icon Thermo View.

The macro language equivalents are  thermo_bufr() and thermo_grib() (depending on the specified data type).

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Specifies how the geographical location, for which the diagram is to be plotted, will be selected. Options are: Coordinates, Area Average and Station.

Coordinates

Specifies the latitude/longitude geographical location for which the diagram is to be plotted. Enter the coordinates (lat/long) of a point separated by a "/" (lat/long). Alternatively, use the coordinate assist button.

Area Average

Specifies a geographical area (lat1/lon1/lat2/lon2) over which an area average value will be used, instead of a point value, to produce the diagram. Enter the coordinates (lat/long) of an area separated by a "/" (top left lat and long, bottom right lat and long). Alternatively, use the coordinate assist button.

Station

Specifies the location for which the diagram is to be plotted. In the Bufr Thermo dialogue, this must define a meteorological station that provides full upper air soundings. In the Grib Thermo dialogue, this may represent any arbitrary geographical point.

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Specifies the way to calculate values at the point location for GRIB thermodynamic diagrams. Options are:

Interpolate - interpolate values from the surrounding grid points (default)

Nearest Gridpoint - using the data of the nearest grid point

Dew Point Formulation

Specifies the equation to compute the Dew Point parameter. Options are: "Saturation Over Water" and "Mixed Phase 0 to -23".

Temperature Param

Specifies the parameter number of the temperature, if the data is a non-ECMWF. ECMWF uses specific parameter numbers different from the WMO ones.

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