Email RIS file
Bookmark
Report an Issue

Technical report series on global modeling and data assimilation. Volume 4 : Documentation of the Goddard Earth Observing System (GEOS) data assimilation system, version 1.

Author
Pfaendtner, James
Published
Jan 1, 1995.
Physical Description
1 electronic document
Additional Creators
Seablom, Michael, Stobie, James, Lamich, David, Suarez, Max J., Dasilva, Arlindo, Bloom, Stephen, and Sienkiewicz, Meta
Online Version

Availability

I Want It
I Want It

Finding items...

Restrictions on Access
Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
This report describes the analysis component of the Goddard Earth Observing System, Data Assimilation System, Version 1 (GEOS-1 DAS). The general features of the data assimilation system are outlined, followed by a thorough description of the statistical interpolation algorithm, including specification of error covariances and quality control of observations. We conclude with a discussion of the current status of development of the GEOS data assimilation system. The main components of GEOS-1 DAS are an atmospheric general circulation model and an Optimal Interpolation algorithm. The system is cycled using the Incremental Analysis Update (IAU) technique in which analysis increments are introduced as time independent forcing terms in a forecast model integration. The system is capable of producing dynamically balanced states without the explicit use of initialization, as well as a time-continuous representation of non- observables such as precipitation and radiational fluxes. This version of the data assimilation system was used in the five-year reanalysis project completed in April 1994 by Goddard's Data Assimilation Office (DAO) Data from this reanalysis are available from the Goddard Distributed Active Center (DAAC), which is part of NASA's Earth Observing System Data and Information System (EOSDIS). For information on how to obtain these data sets, contact the Goddard DAAC at (301) 286-3209, EMAIL daac@gsfc.nasa.gov.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19950017109.
Accession ID: 95N23529.
NAS 1.15:104606-VOL-4.
NASA-TM-104606-VOL-4.
REPT-95B00040-VOL-4.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15654668