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Part III. Appendix 3: Data Archive and AccessThe Archive SystemThe Archive System will use coordinated methods for data collection, quality control, archiving,and user access. The system will consist of a distributed network of archive centers, regional datacenters, modeling centers, and data-assembly centers, all interconnected to provide efficient flow ofdata into the IOOS archive and easy access to its data and products (Figure 1). Although data mayflow from observing systems to any of the four types of centers, at least one copy of each observationdesired by IOOS must ultimately reside in an IOOS archive center. For the purpose of IOOS,data will be considered in the Archive System if the following two conditions are met: (1) the dataare held and access is provided by one of the System components, and (2) there are proceduresin place to preserve the data at an archive center. Through this approach data will be under IOOSmanagement early in its life cycle and thereby maximize the amount securely archived and uniformlyaccessible. The IOOS Archive System will take full advantage of the infrastructure, expertise,and historical reference data sets at existing data centers. It is probable and practical that more thanone type of center may be physically collocated, for example, a data assembly center may be an entityat a national archive center. Additional resources (expertise, people, funds) will be needed tomeet the expanding requirements of IOOS.IOOSObservationsArchiveCentersRegional DataCentersModelingCentersData AssemblyCentersArchive SystemData Discovery and Access Interfaces for the Archive SystemUsers and ApplicationsFigure 1. Primary archival (solid lines) and access (dashed lines) data fl ow within the DMAC Archive System ofIOOS. Not shown are the secondary bi-directional archival data fl ow between all the centers and IOOS observationsfl owing directly to users and applications external to the Archive System.198