Tropical CPT Hovmoeller Diagnostic#

Create tropical CPT Hovmoeller plots with contour overlays.

This diagnostic identifies the tropical cold-point tropopause (CPT) by searching for the minimum temperature between configurable pressure bounds and creates, per dataset, one standalone Hovmoeller plot per variable for each of two views:

  • longitude-time (mean over the tropical latitude band, full longitude range)

  • latitude-time (restricted to the tropical latitude band, mean over the full longitude range)

In both views:

  • filled colors (all plots): CPT pressure

  • line contours: CPT temperature, CPT specific humidity, or CPT RH over ice (one variable per figure)

Configuration options#

  • temperature_var: Short name for temperature variable (default: ta).

  • humidity_var: Short name for specific humidity variable (default: hus).

  • geopotential_height_var: Optional short name for geopotential height (default: zg). Used for output only.

  • pressure_bounds_hpa: Two values [top, bottom] in hPa for CPT search (default: [10.0, 500.0]).

  • tropical_lat_bounds: Two values [south, north] in degrees (default: [-20.0, 20.0]).

  • group_by: Metadata facet used to group inputs (default: alias).

  • lon_resolution: Longitude bin width in degrees (default: 2.5).

  • lat_resolution: Latitude bin width in degrees (default: 2.5).

  • plot_filename: Prefix for output file names (default: tropical_cpt_hovmoeller).

  • dpi: Figure DPI (default: 300).