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The Hovmoeller Data Editor
Data
Specifies the data (GRIB icon) from which to derive the average profile. The input GRIB icon must specify a multi-level (pressure or model levels) upper air meteorological variable, in a latitude-longitude or Gaussian grid. If the input data is specified in model levels, you must include the parameter LNSP should you want the vertical axis of the plot in pressure levels rather than model levels when visualising the output. Note that the input fields should be on the same grid. If more than one time and/or forecast step is contained in the GRIB icon, Average returns a set of average cross sections.
Interpolate Values
Specifies whether to interpolate vertically the average cross-section values into a regular set of interpolated vertical levels. Choosing not to interpolate returns an average cross section data matrix with values at the original levels.
Note - if you need to use the average cross section data in calculations further down the stream you should not interpolate.
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The Hovmøller 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. The available input panes are:
Line Hovm - Provides input for Hovmøller diagrams derived from an input transect line.
Area Hovm - Provides input for Hovmøller diagrams derived from an input rectangular area.
Vertical Hovm - Provides input for Hovemøller diagrams derived from an input rectangular area and a set of levels.
Expand Hovm - Provides input for expanding Hovmøller diagrams that have been derived previously.
To operate with this icon first select one of the above options by clicking the appropriate menu option from the Application parameter.
Line (Line Hovm)
Specifies the coordinates of a transect line along which the Hovmøller diagram is calculated. Enter the coordinates (lat/long) of a line separated by a "/" (lat1/long1/lat2/long2). Alternatively, use the coordinate assist button.
Area (Area Hovm or Vertical Hovm)
Specifies the coordinates of the area over which the average profile Hovmøller diagram is calculated. 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.
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Specifies the data (GRIB icon) from which to derive the Hovmøller diagram. The input GRIB icon must specify a time-series of a meteorological variable in a latitude-longitude or Gaussian grid. The assist button provides a default MARS Retrieval icon that you can be modified to suit user requirements.
If the selected option is Area Hovm or Line Hovm and if more than one parameter and/or level is contained in the GRIB icon, Hovmøller Data returns a set of Hovmøller diagrams. However, if the selected option is Height Hovm, the GRIB icon should contain a set of levels for each parameter.
Average Direction (Area Hovm)
Specifies the direction along which the averaging of the variable is performed. Options are North South and East West. For North South, the averaging is weighted by cos(latitude).
Swap Axes
By default, the definition of the vertical and horizontal axes of the Hovmøller diagrams follows pre-defined rules. However, if Swap Axes is set to Yes then the axes will be swapped around.