1. World Data Centre for Climate - WDCC -
Hannes Thiemann

2. Übersicht Einordung in die wissenschaftspolitische Landschaft
Implementation des WDCC
Inhalt des WDCC
Zugriff auf das WDCC
WDCC Verbund

3. International Council for Science (History)
Founded 1931
represents the evolution and expansion of two earlier bodies
International Association of Academies (IAA; )
International Research Council (IRC; )

4. International Council for Science (ICSU)
In order to strengthen international science for the benefit of society, ICSU mobilizes the knowledge and resources of the international science community to:
Identify and address major issues of importance to science and society.
Facilitate interaction amongst scientists across all disciplines and from all countries.
Promote the participation of all scientists—regardless of race, citizenship, language, political stance, or gender—in the international scientific endeavour.
Provide independent, authoritative advice to stimulate constructive dialogue between the scientific community and governments, civil society, and the private sector.

5. ICSU Activities International Geophysical Year (1957-58)
International Biological Programme ( )
International Geosphere-Biosphere Programme: A Study of Global Change (IGBP)
World Climate Research Programme (WCRP)
DIVERSITAS: An Integrated Programme of Biodiversity Science
International Human Dimensions Programme on Global Environmental Change (IHDP).

6. ICSU
ICSU has several interdisciplinary bodies, whose principal focus is the management and use of large scientific data sets:
the Committee on Data for Science and Technology (CODATA)
the Federation of Astronomical and Geophysical Data Analysis Services (FAGS)
the Panel of the World Data Centres (WDC)

7. WDC system
The World Data Center (WDC) system was created to archive and distribute data (…) . Originally established in the United States, Europe, Russia, and Japan, the WDC system has since expanded to other countries and to new scientific disciplines.
The WDC system now includes 52 Centers in 12 countries. Its holdings include a wide range of solar, geophysical, environmental, and human dimensions data.

8. WDC principles
WDCs are funded and maintained by their host countries on behalf of the international science community.
They accept data from national and international scientific or monitoring programs as resources permit. All data held in WDCs are available for no more than the cost of copying and sending the requested information.

9. WDCC Start: Approved in January 2003
Maintenance: Model and Data (M&D/MPIMET) and German Climate Computing Centre (DKRZ)
Mission: Data for climate research are collected, stored and disseminated
ICSU Policy: long-term archiving and unrestricted data access for scientists
Restriction: Only climate data products in CERA DB, no raw data storage.
Content: Emphasis is spent on climate modelling and related data products.
Co-operation: with thematically corresponding data centres like WDC-MARE (Bremen) and WDC-RSAT (Oberpfaffenhofen)
URL:

10. WDCC + CERA
WDCC is built upon CERA database system at M&D / DKRZ

12. Semantic Data Management
Data consist of numbers and metadata.
Metadata construct the semantic data context.
Metadata form a data catalogue which makes data searchable.
Data are produced, archived and extracted within their semantic context.
Data without explanation are only numbers.
Problems:
Metadata are of different complexity for different data types.
Consistency between numbers and metadata have to be ensured.

13. CERA Hierarchy
Data catalogue

14. Contact
Coverage
Reference
Entry
Status
Parameter
Distribution
Spatial
Reference
Local Adm.
Data Access
Data Org

15. CERA-2 Data Model
Complete with respect to IEEE’s Reference Model for Metadata (Bretherton, 1994)
Browse, Search and Retrieval
Ingest, Quality Assurance, Reprocessing
Application to Application Transfer
Storage and Archive
Reference
“The CERA-2 Data Model” (DKRZ-Report No. 15, 1998)
URL:

16. Interoperability
Supports interoperability due to inclusion of international standards
Directory Interchange Format (NASA, 1998)
FGDC Metadata Content Standard (FGDC, 1996)
ISO Metadata Standard for Geographic Information (ISO 19115)

17. CERA Hierarchy
Data catalogue – “Yellow pages”
Pointer to primary data

18. CERA Pointer Document the location of model raw data
To allow users to locate model raw data quickly
Provide consistency between CERA and the model raw data

19. CERA Hierarchy Storage of application oriented pre-processed data
Data catalogue – “Yellow pages”
Pointer to primary data
Storage of application oriented pre-processed data

20. CERA Data Storage
CERA offers the storage of application oriented, pre-processed data
Could be either the storage of
Aggregated data like monthly means
Range of variables in full resolution (1h/6h-values)
Can be only done for the most relevant production runs

21. 5D Model Data Structure Model Raw Data Structure Application-oriented
6-hour
Storage
Interval
Application-oriented
Data Storage

22. WDC-CLIMATE / Data Content (I)
Climate Model Data (Continuous stream of new data)
IPCC DDC (Data Distribution Centre)
Will be continued for the Fourth Assessment Report
CEOP (Coordinated Enhanced Observing Period) Model output retention and handling Centre
Part of WCRP that was motivated by GEWEX with focus on water and energy cycles within the climate system ( – )

23. WDC-CLIMATE / Data Content (II)
Observational Data
Model related observations: ERA15/40 (ECMWF), NCEP 40 Y. Reanal.
Instrumental data: WOCE (World Ocean Circulation Experiment)
Earth observations: Access to SST's from NOAA AVHRR in cooperation with WDC RSAT (distributed archive)
Project Support (encourage Good Scientific Practice)
HOAPS (Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite Data)
CARIBIC (Civil Aircraft for Regular Investigation of the Atmosphere Based on an Instrumentation Container), MPI Mainz
Different model applications

24. WDCC: some numbers Size of CERA: 170 Tbyte Number of experiments: 410
Number of datasets: 57000
No. of blobs:4.5 billion
Downloads last 12 months

25. User Interface - extract data -
Graphical User Interface
Batch Interface

26. Selection via CERA meta data:
selection of the project
selection of the experiment (=model run)
display of meta data: experiment, quality, datasets
selection of the dataset
display of dataset information
add datasets to “process list”
download to client

27. Batch Interface - jblob -
Java application to allow for batch download of datasets
jblob -datasetname name[ -options ]
jblob –showdatasets "search string"( use '%' as wildcard )
jblob –help
Example:
jblob -datasetname EH4OPYC_SRES_A2_WIND10 -dir /tmp
See hands on session tomorrow

28. WDC Verbund Erdsystemforschung
Wurde am von den 3 deutschen ICSU WDC's in Oberpfaffenhofen gegründet.
WDC for Climate: M&D / DKRZ, Hamburg
WDC MARE (Marine Environmental Sciences): Marum, Bremen und Bremerhaven
WDC RSAT (Remote Sensing for the Atmosphere): DFD/DLR, Oberpfaffenhofen
Verpflichtung:
Langzeit-Datenarchivierung und freier, unbeschränkter Datenzugang für alle Wissenschaftler (ICSU Rules for WDC's und Regeln zur guten wissenschaftlichen Praxis)

29. WDC Verbund Erdsystemforschung Grundsatzerklärung Datenpublikation
Die Daten selbst sollen unabhängig vom archivierenden System eindeutig Identifizierbar, referenzierbar und universell zugreifbar sein (z.B. Vergabe von DOI's).
DFG Projekt "Publikation und Zitierfähigkeit wissenschaftlicher Primärdaten" (Beginn )
Service der Datenzentren
Qualifizierte thematische Datenzentren übernehmen die Rolle für die Archivierung und Publikation von wissenschaftlichen Daten.
Die Zentren garantieren eine langfristige und freie Verfügbarkeit archivierter Daten im Rahmen der Richtlinien der ICSU Weltdatenzentren.
Datenzentren stehen mit ihrer Expertise den Fördereinrichtungen, den Gutachtern und der Wissenschaft beratend zur Verfügung.

30. CERA DB using countries

31. Contact
WDCC:
CERA:

32. Data Group maintaining the WDCC
Michael Kurtz
Hans Luthardt
Michael Lautenschlager
Heinke Höck
Hannes Thiemann
Hermann Winter
Jörg Wegner
Frank Toussaint
Peter Lenzen

33. Thank you for your attention