Physical Oceanography Distributed Active Archive Center

Physical Oceanography Distributed Active Archive Center
Name	Physical Oceanography Distributed Active Archive Center
Abbreviation	PODAAC
Type	Data center
Parent organization	NASA Jet Propulsion Laboratory
Location	Pasadena, California
Established	1980s

Physical Oceanography Distributed Active Archive Center is a NASA-funded data archive and distribution node serving the oceanographic research community. It provides curated satellite-derived and in situ datasets, enabling analysis by scientists involved with NOAA, European Space Agency, NOAA National Centers for Environmental Information, USGS, and academic institutions such as Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, Lamont–Doherty Earth Observatory, and University of Washington. The center supports mission science teams from TOPEX/Poseidon, Jason-1, Jason-2, Jason-3, Sentinel-3, ICESat, ICESat-2, GRACE, GRACE-FO, SeaWiFS, Aqua, Terra, SMAP, and Oceansat series.

Overview

The center archives, curates, and distributes geophysical datasets including sea surface height, sea surface temperature, ocean vector winds, sea ice extent, and ocean color from missions such as Jason-3, Sentinel-6 Michael Freilich, MODIS, and VIIRS. It serves researcher communities connected with Goddard Space Flight Center, Ames Research Center, NOAA NOS, EUMETSAT, JAXA, and ISRO. The archive supports operational stakeholders including NRL, United States Navy, United States Coast Guard, and environmental programs like GOOS, Argo, and GPM.

History and Development

The provenance of the archive traces to data stewardship initiatives related to TOPEX/Poseidon and collaborations among NASA, CNES, NOAA, and CNES/ESA partners. Development milestones intersect with programs such as SeaWiFS and OSTM. Institutional evolution involved coordination with JPL management, Goddard Space Flight Center, and university research groups at Scripps Institution of Oceanography and Woods Hole Oceanographic Institution. Important programmatic events include data reprocessing campaigns tied to Jason-1 reprocessing, algorithm updates associated with GHRSST (Group for High Resolution Sea Surface Temperature) standards, and intercomparisons with Argo float networks and TAO/TRITON arrays.

Data Collections and Services

Collections encompass altimetry from TOPEX/Poseidon, Jason-1, Jason-2, Jason-3, Sentinel-3, and Sentinel-6 Michael Freilich; sea surface temperature from MODIS, VIIRS, and AVHRR; ocean vector winds from QuikSCAT and ASCAT; gravimetry from GRACE and GRACE-FO; and ice products linked to ICESat and ICESat-2. The center curates value-added products such as global mean sea level time series, mesoscale eddy catalogs, and climate indices used by IPCC assessments. Services include data subsetting used by teams at NWS, time series generation employed in studies at Plymouth Marine Laboratory, and climate reanalysis inputs for groups like ECMWF and NCAR.

Technology and Infrastructure

Infrastructure integrates high-performance storage, metadata catalogs compliant with ISO 19115 and CF conventions, and distribution protocols such as OPeNDAP, FTP, and HTTP/REST endpoints used by modeling centers including GFDL and NRL Oceanography. Software stacks include tools aligned with NetCDF, HDF5, GDAL, and visualization via clients used by Panoply and ParaView. The archive leverages cloud and grid resources similar to initiatives by Amazon Web Services, Google Cloud Platform, and Microsoft Azure collaborations elsewhere, and interfaces with community portals such as Earthdata and PO.DAAC-hosted APIs.

Access, Distribution, and User Support

Data access pathways accommodate investigators, educators, and operational users affiliated with Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, Lamont–Doherty Earth Observatory, University of Miami, University of California, San Diego, and international partners like CSIRO and Plymouth Marine Laboratory. Distribution mechanisms include scripted bulk download systems used by groups at NOAA, live web services consumed by EOSDIS clients, and data citation practices consistent with policies from NSF and NASA. User support entails documentation, user forums linked to community efforts such as GHRSST and training workshops co-hosted with Scripps Institution of Oceanography and Woods Hole Oceanographic Institution.

Collaborations and Partnerships

Operational and scientific collaborations span agencies and laboratories: NASA, NOAA, ESA, JAXA, CNES, ISRO, JPL, Goddard Space Flight Center, Ames Research Center, NRL, Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, Lamont–Doherty Earth Observatory, CSIR, CSIRO, Plymouth Marine Laboratory, ECMWF, and NCAR. The center contributes data to global programs including Argo, GOOS, GCOS, and supports climate assessments by IPCC working groups. Partnerships extend to instrument teams from missions such as Jason-3, Sentinel-6 Michael Freilich, MODIS, VIIRS, GRACE-FO, and community projects like GHRSST and IOOS regional associations.

Category:Data archives