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 This icon derives (and returns) a Thermodynamic diagram data unit. In such 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.

The Thermo data Data icon can be plotted (using default plotting specifications) or saved as a NetCDF data file. The input data type are observations (upper air BUFR) or model field (GRIB) data.

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

The Thermo Data Editor

The Tephigram Thermo Data editor belongs to a type of editor known as family editor which allows related sets of input specifications to be grouped in the same icon editor, each in its own tabbed pane (like the Simple Formula icon - see Figure III-3 on page III-71). The available working input panes are :

Pm Bufr Tephi Thermo - Provides input for tephigrams thermodynamic diagrams based on observation (BUFR) data.

Pm Grib Tephi Thermo - Provides input for tephigrams thermodynamic diagrams based on model field (GRIB) data post 4th April 1995

Pm Pre19950404Grib Tephi - Provides input for tephigrams based on model field (GRIB) data pre 4th April 1995

The two varieties of GRIB data tephigrams exist due to changes in the attributes of the input data - parameter Q changed to Gaussian Grid from Spherical Harmonics.

To operate with this icon first you need to select which output you want to produce by clicking the tab of the corresponding pane.

Data

Drop any icon containing or returning BUFR data. This may be, for example, a MARS Retrieval (of observations) icon, a BUFR file icon or an Observation Filter icon (provided it outputs BUFR, not geopoints).


Data (Bufr Thermo)

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 in case you need some guidance in the data specification. The requested data is upper air sounding data (VSNS - Vertical Sounding Non-Satellite in BUFR-speak). Please note that PILOT observations (winds only) have not enough data for plotting a thermodynamic diagram.

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 in case you need some guidance in the data specification. The requested data are gridded model fields: Temperature, Logarithm of Surface Pressure and Specific Humidity

 

 

Output

Specifies the output format you want. Specify one of the geopoints formats (Geographical Points, Geographical Polar Vectors or Geographical X Y Vectors).

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If set to Ignore, missing data is not included in the output file; this is the default behaviour. If set to Include, missing data will be output to the geopoints file, its value being set to that specified by Missing Data Value. Note that when the output format is one of the two geopoints vector formats, the observation is considered missing if one or both of the parameters are missing.

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