NOAA KLM User's Guide

Section 9.3.1.2

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9.3.1.2 Monthly Mean Radiation Budget Product

Each file contains a single month of monthly mean radiation budget data (25 records). The first record is the header. It contains six types of data: HIRS Night OLR, HIRS Day OLR, AVHRR Night OLR, AVHRR Day OLR, Available Solar Energy, and AVHRR SW Absorbed Radiation. Each type of data is associated with four records (The Northern Hemisphere pair and the Southern Hemisphere pair).

The format of the header record for the Monthly Means (and also the Seasonal and Annual Means)data is shown in Table 9.3.1.2-1.

Table 9.3.1.2-1. Format of Header Record for Monthly/Seasonal/Annual Mean Data.
Field Bytes Type Description
HEADER 1-100 ASCII Text header
SATID 101-102 I*2 The satellite ID
RPTREQ 103-104 I*2 The type of mean:
0=Monthly;
1=Winter;
2=Spring;
3=Summer;
4=Fall;
5=Annual.
RPTYR 105-106 I*2 The four digit year of the initial data.
RPTMO 107-108 I*2 The month of the initial data.
VER 109-110 I*2 Version number of this file format.
RPTOY 111-112 I*2 The four digit year of the latest data contained in the file.
RPTOM 113-114 I*2 The month of the latest data contained in the file.
RPTOD 115-116 I*2 The day of the month of the latest data contained in the file.
SPARES 117-122 I*2 SPARES
MAXCNT 123-124 I*2 The number of records in the file .
SPARES 125- 126 I*2 SPARES
EPOCHY 127-128 I*2 The four digit satellite epoch year (launch year).
EPOCHD 129-130 I*2 The satellite epoch day-in-year (launch day).
EPOCHT 131-132 I*2 The time of day of the satellite launch:
1=morning;
2=afternoon.
TYPREC 133-134 I*2 The record type of this (header) record (=1).
NUMTYPS 135-136 I*2 The number of data types in the file . The maximum number of data types is 35. The current number supported is 6.
NUMRECS

137-138 I*2 The number of records per data type is 4.
TYPENAM 139-208 32 I*2 The names of the number of data types currently supported in the file. There is one name for each of the NUMTYPS supported. 2=HN, 3=GLN, 13=HD, 15=GLD, 24=AS, 26=GS
SPARES 209-6447 I*2 The spare bytes in the header record.

Tables 9.3.1.2-2 and 9.3.1.2-3 contain the format for Records 1 and 2 of the Monthly Mean Data, respectively.

Table 9.3.1.2-2. Format of Monthly Mean Data Record 1 of a Hemisphere Pair.
Field Bytes Type Description
SPARE 1-2 I*2 SPARES
BCDDAY 3-4 I*2 The actual day number, relative to the satellite Epoch, of the first day in the period covered in the filel. (i.e. for monthly means the day is the relative to the first day of the month)
SPARES 5-12 I*2 SPARES
RCTYPE1 13-14 I*2 The indicator for the first record of the hemisphere:
02 = Record 1 for the Northern Hemisphere;
04 = Record 1 for the Southern Hemisphere.
SPARE 15-16 I*2 SPARES
FIELD 17-18 I*2 The Field mnemonic. (See Table 9.3.1.1-4.)
NORS 19-20 I*2 The hemisphere indicator:
0= North;
1= South
BEGINDATE 21-24 2 I*2 The start time as YYYYMM of the data in the record.
SPARE 25-26 I*2 SPARES
ENDDATEF 27-30 2I*2 The end time as YYYYMM of the data in the record.
SPARES 31-276 I*2 SPARES
I2MAP 277-23476 I*2 The mean values of the first 11600 I*2 elements of the 20626 elements of the Equal Areas/Equal Aspect Map


9.3.1.2-3. Format of Monthly Mean Data Record 2 of a Hemisphere Pair.
Field Bytes Type Description
RECTYP2 1-2 I*2 The indicator for the second record of the hemisphere:
03=Record 2 for the Northern Hemisphere;
05=Record 2 for the Southern Hemisphere.
FIELD 3-4 I*2 The Field mnemonic. (See Table 9.3.1.1-4.)
NORS 5-6 I*2 The hemisphere indicator:
0=North;
1= South.
NCELL 7-186 90 I*2 The number of longitude bins in each of 90 latitude bands of the (current) Equal Areas/Equal Aspect Pathfinder Maps starting at the pole and abutting (to the west) the Greenwich Meridian.
SPARES 187-276 I*2 SPARES
I2MAP 277- 18328 I*2 The mean values of the last 9026 I*2 elements of the 20,626 elements of the Equal Areas/Equal Aspect Map
SPARES 18329-22036 I*2 SPARE
E2MAP 22037-23476 I*2 The 720 I*2 mean elements of the equatorial band data for the hemisphere


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