MARS

Specifies the output grid which can be either a Gaussian or a Latitude/Longitude grid.

grid=<value>

MARS requests specifying grid=av will return the archived model grid. For Latitude/Longitude output, the format is in degrees, i.e. grid = 2.5/2.5, where the first number denotes the east-west resolution (longitude) and the second denotes the north-south resolution (latitude). The grid spacing needs to be an integer fraction of 90 degrees (latitude range from the Equator to the Pole), e.g. 0.225, 0.25, 0.28125, 0.3, 0.4, ...

Output on a Gaussian grid is specified by a letter denoting the type of Gaussian grid followed by an integer (the grid number) representing the number of lines between the Pole and Equator, e.g. 

• grid = F160  - full (or regular) Gaussian grid with 160 latitude lines between the pole and equator
• grid = N320  - ECMWF original reduced Gaussian grid with 320 latitude lines between the pole and equator, see Reduced Gaussian Grids for grid numbers used at ECMWF
• grid = O640 - ECMWF octahedral (reduced) Gaussian grid with 640 latitude lines between the pole and equator

Not all grid names and grid number combinations are supported. Currently, the Gaussian grid names and numbers supported for MARS retrievals are:

MARS requests specifying an unsupported grid will fail. For example, a retrieval request with grid=O123 will return an error.  If the letter denoting the type of Gaussian grid is omitted, e.g. grid=320, a full (or regular) Gaussian grid with 320 grid lines is returned.

Examples

Dissemination

Specifies the format of the dissemination files.

format=<value>

Valid formats are: