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changes.mady.by.user Fernando Ii

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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  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 the data to be used in the plotting of a thermodynamic diagram from observations data. The icon field assist button provides a tailor made MARS request to help with the data specification. The data should be upper air sounding data (VSNS - Vertical Sounding Non-Satellite ). Please note that PILOT observations (winds only) do not have enough data for plotting a thermodynamic diagram.

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GRIB data
GRIB data
Data (Grib Thermo)

Specifies the data to be used in the plotting of a thermodynamic diagram from model field data. The icon field assist button provides a tailor made MARS request to help with the data specification. The data should include gridded model fields of Temperature and Specific Humidity. These parameters must have the same number of levels and they will be used to compute the Dew Point parameter. Fieldsets U and V wind components are optional, but if given they will be used to compute the wind vectors data unit. These two components must have the same number of levels, but not necessarily have the same number of levels of Temperature and Specific Humidity. If the data is given in model levels then a Logarithm of Surface Pressure field must be provided too. The data can be provided as a single GRIB file or as multiple GRIB files.

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