Dissemination requirements

STREAM

=

SHORT CUTOFF DAILY ARCHIVE

[SCDA]

DOMAIN

=

GLOBAL

[G]

TYPE

=

ANALYSIS

FORECAST

[AN]

[FC]

USE

=

OFF

BC To indicate that DA stream products will be generated and disseminated as SCDA products - valid only for STREAM=DA,TIME=00/12

TIME

=

* (hours)

Gives analysis or forecast base time 12, 18, 00, 06.

STEP

=

* (hours) default is 00

Gives forecast and analysis time step(s);.

For analysis value is 00.

NB ALL, is not permitted.

PARAM

=

Field name abbreviation

*

NB ALL is not permitted.

Available parameters are listed in Table 4.2.

RESOL

=

*

[AV]

(default 1279)

Positive integer giving the spectral triangular truncation.

(e.g. 10 indicates T10 filtered products required. May only be used with multi-level (i.e. upper air) parameters. May also be used if spectral products are required.)

FORMAT

=

GRIB

[GB]

GAUSSIAN

=

REGULAR

REDUCED

OFF

Indicating Gaussian grid type. Gaussian grid resolution is given by the GRID parameter.

GRID

=

*

*/*

AUTOMATIC [AUTO]

If the form a/b is used, a latitude-longitude grid is defined, where:

a= grid resolution (deg.) along a latitude line (i.e. East/West)

b= grid resolution (deg.) along a longitude line (i.e. North/South)

Both a and b must be 0.125 degrees, or multiples thereof, for latitude

longitude grids.

Note that it is possible to specify different values for a and b to generate a quasi-regular grid system with a different resolution in the West-East direction from that in the North-South direction. This feature is only valid for latitude-longitude grid.

If a single positive integer is coded, it is interpreted as Gaussian grid number for grids defined as GAUSSIAN=REDUCED or REGULAR. The following Gaussian grid numbers are supported: 640, 400, 256, 200, 160, 128, 80, 48 and 32.

AUTOMATIC - values for the parameter GRID will be defined automatically based on STREAM/DOMAIN as well as RESOL/ GAUSSIAN parameter values;

AREA

=

*/*/*/*

Output area definition. Four values (3 decimal places allowed) to provide a user- defined sub-area as North/West/South/East;

Negative values indicate western longitudes and southern latitudes.

ROTATION

=

OFF to switch off rotation (default)

a/b

a = is the latitude of the southern pole of rotation

b = is the longitude of the southern pole of rotation

FRAME

=

OFF to switch off the frame option

n

n is the number of points inward from each edge of defined area required to form a boundary product. The resulting FM 92 GRIB code will contain bits set within the appropriate ate flag to indicate that sections 2 and 3 are both present.

BITMAP

=

OFF to switch off the bitmap option

"filename"

"filename" is the name of a file containing a valid user-defined bitmap specification to build a product by selecting data from points of a latitude-

longitude or a Gaussian grid.

ACCURACY

=

NORMAL

ARCHIVED VALUE

n

[N]

[AV]

(default) - GRIB only

n is the number of bits per packed value. n must not be less than half of default value nor greater then 24.

[N] - Default values are listed in the Table 4.2

[AV] - Resulting field will have accuracy of the originally generated and archived field.

PACKING

=

ARCHIVED VALUE

SIMPLE

SECOND ORDER

COMPLEX

[AV]

[SIM]

[SO]

[CO]

(default)

AV - GRIB packing as currently in use, at the moment SIMPLE for grid point data and COMPLEX for spherical harmonics data.

SIM - simple packing (both grid point and spherical harmonics data);

SO - grid point data only (substantiality reduces the size of GRIB messages);

CO - spherical harmonics data only;

PADDING

=

AUTOMATIC

NONE

n

[AUTO]

[N]

as currently in use (default);

no padding;

n is the number of bytes to which multiple the binary message is padded to with NULL bytes;

The meaning of AUTO is at the moment 120 bytes for GRIB data and 8 bytes for BUFR data. Also, these are the only values supported for n at the moment.

OPTIONS

=

NORMAL

DELAY

NOBACKUP

[NORM] (default)

[DELA]

[NOBACK]

Note:

DELAY causes products to be generated, but not transmitted;

DELAY products can be obtained using the repeat facility.

NOBACKUP causes no backup products to be generated if operations is running late or the operational cycle is missed