Short Name:
OSDPD0048_52_57

Bi-Weekly and Monthly Mean SST Archive and Accumulation Files from the NOAA TIROS/N Satellite Series

The Bi-Monthly SST Archive tape (SSTFLD) contains a half month archive of 1 X 1 degree satellite-derived SST fields between 70S and 70N. The tape is produced on the 2nd and the 16th of each month and contains daily fields for the previous 20 days. The tape is a 9-track, 1600 bpi, unlabeled, odd-parity, binary tape produced on an IBM 360/195 computer. The tape has two physical files, each ending with a physical end-of-file mark. The first file has only one record (physical) which contains information about the data on the tape and serves as a header file. The second file has 2851 physical records. The first record is a directory record pointing to each of twenty individual fields. Each field has 142 records. The Satellite Monthly Mean Archive tape (SSTMON) contains 12 monthly mean sea surface temperature (SST) fields for one calendar year. File two of the tape is a direct copy of the disk data set NSS.PSATAV.SST.MEANFLD. This archive is created on January 10th every year, archiving the monthly mean fields for the previous year. Data on this tape were derived exclusively from satellite data. The field has a 2.5 X 2.5 degree resolution. For each 2.5 degree box in the field there is a count of the number of observations in the box, the mean, and the standard deviation. The tape is a 9-track, 1600 bpi, unlabeled, odd-parity, binary type produced on an IBM 360/195 computer. The tape has two physical files, each ending with a physical end-of-file mark. The first file has only one record (physical) which contains information about the data on the tape and serves as a header file. The second file has 72 physical records, each containing 12 logical records, containing satellite SST monthly mean data. The Monthly Mean SST Accumulation file (MOMEAN) provides storage for a global 2.5 degree resolution accumulation of SST information leading to a monthly determination of mean SST and standard deviation within each grid box. Boxes are bordered by meridians and parallels which are multiples of 2.5 degrees in latitude and longitude, so that 4 boxes may be combined to produce boxes centered on intersections of meridians and parallels which are multiples of 5 degrees in latitude and longitude. Three quantities are stored for each grid box and are operated twice weekly with newly arrived observations. These are 1) the number of observations occurring in the box, 2) the sum of the measured temperatures, and 3) the sum of these temperatures. From these, a mean temperature and standard deviation are derived for each box at the end of each month. There are 144 X 72 = 10,368 boxes covering the globe. Each requires 3 words--N, T, T2-- or 12 bytes of storage. Seven latitudinal rows of 144 boxes will fit on one track so that 10 2/7 tracks are required each month. Four months' data will be maintained on disk so that a quarterly report can be comprised from the file directly. The fourth month makes provision for lags in processing. One directory record will be needed, and 42 tracks are required in all.

Map of Earth