GRIB2 - PRODUCT DEFINITION TEMPLATE 4.83

Individual ensemble forecast, control and perturbed, at a horizontal level or in a
horizontal layer in a continuous or non-continuous time interval for aerosol with source or sink

Created 03/01/2023


Octet No. Contents
10
 Parameter category (see Code table 4.1)
11
 Parameter number (see Code table 4.2)
12
 Type of generating process (see Code table 4.3)
13-14
 Aerosol type (see Code table 4.230)
15
 Source or sink (see Code table 4.238)
16
 Type of interval for first and second sizes (see Code Code Table 4.91)
17
 Scale factor of first size
18-21
 Scaled value of first size in metres
22
 Scale factor of second size
23-26
 Scaled value of second size in metres
27
 Background generating process identifier (defined by originating centre)
28
 Forecast generating process identifier (defined by originating centre)
29-30
 Hours after reference time of data cut-off (see Note 1)
31
 Minutes after reference time of data cut-off
32
 Indicator of unit of time range (see Code table 4.4)
33-36
 Forecast time in units defined by octet 32 (see Note 2)
37
 Type of first fixed surface (see Code table 4.5)
38
 Scale factor of first fixed surface
39-42
 Scaled value of first fixed surface
43
 Type of second fixed surface (see Code table 4.5)
44
 Scale factor of second fixed surface
45-48
 Scaled value of second fixed surface
49
 Type of ensmble forecast (see Code table 4.6)
50
 Perturbation Number
51
 Number of forecasts in ensemble
52-53
 Year of end of overall time interval
54
 Month of end of overall time interval
55
 Day of end of overall time interval
56
 Hour of end of overall time interval
57
 Minute of end of overall time interval
58
 Second of end of overall time interval
59
 n - number of time range specifications describing the time intervals used to calculate the statistically processed field
60-63
 Total number of data values missing in statistical proces
63
 Indicator of unit of time for time range over which statistical processing is done (see Code table 4.4)

64-75 Specification of the outermost (or only) time range over which statistical processing is done
64
 Statistical process used to calculate the processed field from the field at each time increment during the time range (see Code table 4.10)
65
 Type of time increment between successive fields used in the statistical processing (see Code table 4.11)
66
 Indicator of unit of time for time range over which statistical processing is done (see Code table 4.4)
67-70
 Length of the time range over which statistical processing is done, in units defined by the previous octet
71
 Indicator of unit of time for the increment between the successive fields used (see Code table 4.4)
72-75
 Time increment between successive fields, in units defined by the previous octet (see Notes 3 and 4)

76-nn These octets are included only if n > 1, where nn = 63 + 12 x n
76-87
 As octets 64 to 75, next innermost step of processing
88-nn
 Additional time range specifications, included in accordance with the value of n. Contents as octets 61 to 72, 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 is the result of a continuous (or near-continuous) process,
not the processing of a number of discrete samples. Examples of such continuous processes are the temperatures measured by
analogue maximum and minimum thermometers or thermographs, and the rainfall measured by a rain gauge.

4.) 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 62, 74, ...). For all but the innermost (last)
time range, the next inner range is then processed using these reference and forecast
times as the initial reference and forecast times.


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