Seasonal Forecasting System 3 dissemination requirements

STREAM

=

MULTI MODEL SEASONAL FORECAST

[MMSF]

ORIGIN

=

ECMWF

[ECMWF]]

DOMAIN

=

GLOBAL

[G]

TYPE

=

FORECAST

[FC]

SYSTEM

=

3

[3]

METHOD

=

1

[1]

NUMBER

=

n-ENSEMBLE NUMBER

[0-40]

(TYPE=FC)

LEVTYPE

=

SURFACE

PRESSURE LEVEL

POTENTIAL VORTICITY

POTENTIAL TEMPERATURE

[SFC]

[PL]

[PV]

[PT]

LEVELIST

=

*

1000/925/850/700/500/400/300/200/100/50/10

NB ALL is not permitted;

(See 10.2.2 for LEVTYPE=PT/PV products);

TARGET

=

"destination:dissemination_stream_name"

- destination is a three character destination name;

- dissemination_stream_name is a two character dissemination stream name

(the list of destinations/streams is published on:

https://msaccess.ecmwf.int:9443/do/product/requirements/)

PRIORITY

=

1 - 99

Indicates the transmission priority of a `dissemination stream'.

(value 1 being the highest and value 99 being the lowest transmission priority);

TIME

=

00

Gives forecast base time.

STEP

=

* (hours)

6/to/5160/by/6 (+++ table 10.1)

12/to/5160/by/12 (++ table 10.1)

24/to/5160/by/24 (+ table 10.1)

Gives forecast time step(s);.

NB ALL, is not permitted.

PARAM

=

Field name abbreviation

*

NB ALL is not permitted.

Available parameters are listed in Table 10.1.

RESOL

=

*

[AV]

(default 95)

Positive integer giving the spectral triangular truncation from which products are derived, 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 1.5 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.

80 may be coded to signify an N80 Gaussian grid.

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

Both a and b (positive or negative) must be 0.5 degrees, or multiples thereof.

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

[NORM] (default)

[DELA]

Note:

DELAY causes products to be generated, but not transmitted;

DELAY products can be obtained using the repeat facility.