GRIB2 - PRODUCT DEFINITION TEMPLATE 4.43

Individual ensemble forecast, control and perturbed, at a horizontal level or in a horizontal
layer in a continuous or non-continuous time interval for atmospheric chemical constituents

Created 05/28/2009


Octet No. Contents
10
Parameter category (see Code Table 4.1)
11
Parameter number (see Code Table 4.2)
12-13
Atmospheric Chemical Constituent Type (see Code table 4.230)
14
Type of generating process (see Code Table 4.3)
15
Background generating process identifier (defined by originating centre)
16
Forecast generating process identifier (see Code ON388 Table A)
17-18
Hours after reference time data cutoff (see Note 1)
19
Minutes after reference time data cutoff
20
Indicator of unit of time range (see Code Table 4.4)
21-24
Forecast time in units defined by octet 20 (see Note 2)
25
Type of first fixed surface (see Code Table 4.5)
26
Scale factor of first fixed surface
27-30
Scaled value of first fixed surface
31
Type of second fixed surfaced (see Code Table 4.5)
32
Scale factor of second fixed surface
33-36
Scaled value of second fixed surfaces
37
Type of ensemble forecast (see Code Table 4.6)
38
Perturbation number
39
Number of forecasts in ensemble
40-41
Year of end of overall time interval
42
Month of end of overall time interval
43
Day of end of overall time overall time interval
44
Hour of end of overall time interval
45
Minute of end overall time interval
46
Second of end of overall time interval
47
n ― number of time range specifications describing the time intervals used to calculate the statistically-processed field
48-51
Total number of data values missing in the statistical process
52-63 Specification of the outermost (or only) time range over which statistical processing is done
52
Statistical process used to calculate the processed field from the field at each time increment during the time range
(see Code Table 4.10)
53
Type of time increment between successive fields used in the statistical processing (see Code Table 4.11)
54
Indicator of unit of time range over which statistical processing is done (see Code Table 4.4)
55-58
Length of the time range over which statistical processing is done, in units defined by the previous octet
59
Indicator of unit of time for the increment between the successive fields used (see Code Table 4.4)
60-63
Time increment between successive fields, in units defined by the previous octet (see Note 3)
64-nn These octets are included only if n>1, where nn = 51 +12 x n
64-75
As octets 52 to 63, next innermost step of processing
76-nn
Additional time range specifications, included in accordance with the value of n, Contents as octets 52 to 63, repeated as necessary.


Notes:

(1) Hours greater than 65534 will be coded as 65534.

(2) The reference time in section 1 and the forecast time together define the beginning of the overall time interval.

(3) An increment of zero means that the statistical processing the result of continuous (or near continuous) process, not the
processing of a number of discrete samples. Examples of such continuous process are the temperatures measured by
analogue maximum and minimum thermometers or thermographs and the rainfall measured by a rain guage. The
reference and forecast times are successively set to their initial values plus or minus the increment, as defined by the type
of time increment (one of octets 51,63, 75 ...). For all but the innermost (last) time range, the next inner range is then
precessed using these reference and forecast times as the initial reference and forecast time.


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