Cycle 21r1 summary of changes

5 May 1999 Introduction of Cy21r1 of the model changes include:

1. processing and assimilation of raw TOVS/ATOVS radiance data from the NOAA-14/NOAA-15 polar orbiting spacecraft (note that current operational assimilation is reduced t one - NOAA-14 - spacecraft since NOAA-11 failure on 27.2.1999); the move to assimilating raw radiance data (as opposed to the NESDIS pre-processed radiances that were previously used) has required a significant review of the errors assigned to radiance observations in the analysis and new quality control procedures;

2. a complete rewriting of the sea (and lakes) surface temperature and ice concentration software resulting in the correction of several minor inconsistencies.


Cycle changes

Please note

Prior to 2006 information on cycle upgrades has been migrated from the old website to the new website "as is". The information has not been reviewed during the migration.