Production cycle

Introduction

To create TM meteo there are a number of possibilities:

• create global grids:
  • directly from ECMWF data;
  • by combining TM data on a fine grid into coarse cells,
    eventually combine some layers in the vertical;
• create zooming grids:
  • as a subset of global TM meteo,
    eventually combine some layers in the vertical;
  • directly from ECMWF data;
  Meteo for a zoomed grids always need to be matched with meteo on a global grid. For example, the average surface pressures should be the same.

For each data field it should be decided how the values on the fine grid are to be weighted in the new value: equal, by area, by mass, ...

Vertical layers are combined into a single level if the TM model is defined for a subset of ECMWF half levels. Similar as for the horizontal combination, for each field one should decide how the data is weighted.

Keys to be specified

To create new TM meteo, the user should specify for each global or zoom grid how it should be created using two keys:

action

How is the data computed:

new

compute from raw ECMWF data;

combine

combine small cells of a parent grid;

subset

select cells from a parent grid.

parent

The name of a parent grid:

globe

a dummy name, denoting the entire globe, only used for creation of 'new' global TM data;

xxxx

the name of a grid used for a data set which is already available.

Requirements for parent set

At the moment, a parent set (not 'globe') should satisfy the following properties:

• should at least cover the extent of the target grid;
• a cell of a parent grid should cover an integer multiple of target cells, or reverse;
• contain all ECMWF layers.

Examples

New global data

Create global 3x2 data on 44 layers from raw ECMWF data:

pp.task.list : mflux temper pv humid cloud sub kzz
 
TMmeteo.area.list : glb3x2
TMmeteo.resol.v : 44

! global 3x2, processed offline for all layers:
TMmeteo.area.glb3x2.lon : -180.0, 3.0, 120
TMmeteo.area.glb3x2.lat : -90.0, 2.0, 90
TMmeteo.area.glb3x2.action : new
TMmeteo.area.glb3x2.parent : globe

For the constant orography field, perform only once:

pp.task.list : oro

Global data through collecting layers

Create global meteo by combining layers from a global 3x2 set:

pp.task.list : mflux temper pv humid cloud sub kzz
 
TMmeteo.area.list : jos3x2
TMmeteo.resol.v : 33

! global 3x2, processed offline for all layers:
TMmeteo.area.jos3x2.lon : -180.0, 3.0, 120
TMmeteo.area.jos3x2.lat : -90.0, 2.0, 90
TMmeteo.area.jos3x2.action : subset
TMmeteo.area.jos3x2.parent : glb3x2

Global fields based on parent set

Create a parent set off global 3x2 data:

pp.task.list : mflux temper pv humid cloud sub kzz
 
TMmeteo.area.list : glb3x2
TMmeteo.resol.v : 60

! global 3x2, processed offline for all layers:
TMmeteo.area.glb3x2.lon : -180.0, 3.0, 120
TMmeteo.area.glb3x2.lat : -90.0, 2.0, 90
TMmeteo.area.glb3x2.action : new
TMmeteo.area.glb3x2.parent : globe

For the constant orography field, perform only once:

pp.task.list : oro

Coarse global, middle zoom, fine zoom zoom

Create global/zoom meteo on 44 layers in a single cycle:

• global 6x4
• zoom 3x2 over South America
• zoom 1x1 over Suriname

Parent set is 'glb3x2'.

TMmeteo.area.list : glb6x4 sam3x2 sur1x1
TMmeteo.resol.v : 44

! global 6x4, combine from 3x2 cells defined by 'glb3x2':
TMmeteo.area.glb6x4.lon : -180.0, 6.0, 60
TMmeteo.area.glb6x4.lat : -90.0, 4.0, 45
TMmeteo.area.glb6x4.action : combine
TMmeteo.area.glb6x4.parent : glb3x2

! South America, subset of 3x2 cells defined by 'glb3x2': TMmeteo.area.sam3x2.lon : -90.0, 3.0, 20
TMmeteo.area.sam3x2.lat : -60.0, 2.0, 40
TMmeteo.area.sam3x2.action : subset
TMmeteo.area.sam3x2.parent : glb3x2

! Suriname, newly produced but matched with parent 'glb3x2':
TMmeteo.area.sur1x1.lon : -60.0, 1.0, 12
TMmeteo.area.sur1x1.lat : 0.0, 1.0, 10
TMmeteo.area.sur1x1.action : new
TMmeteo.area.sur1x1.parent : glb3x2

Global 1x1 surface fields

NOTE: task 'surf' automatically forces the use of the 'glb1x1' grid ...

pp.task.list : surf
 
TMmeteo.area.list : gl11
 
TMmeteo.area.gl11.lon : -180.0, 1.0, 360
TMmeteo.area.gl11.lat : -90.0, 1.0, 180
TMmeteo.area.gl11.action : new
TMmeteo.area.gl11.parent : globe