1. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 1 GCOS/WCRP Working Group on Observational Data Sets For Reanalysis Russell Vose Chief, Climate Analysis Branch

2. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 2 Not a New Idea The requirements of future reanalysis –GCOS Implementation Plan –WCRP Strategic Framework 2005-2015 The need for improved data sets –NASA/NOAA/NSF Workshop on the Development of Improved Observational Data Sets for Reanalysis (2005) –ECMWF/GEO Workshop on Atmospheric Reanalysis (2006) The inaccessibility of daily/subdaily data –GCOS Implementation Plan –Joint Scientific Committee of the WCRP (2006)

3. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 3 A Service-Oriented Group Our main objectives –Review holdings of “data centers” worldwide to identify relevant data sets –Develop a plan for the construction and management of reanalysis-related data sets A break from the past –Each reanalysis center performs each data management task for each individual reanalysis A few respectable accomplishments –Even though the group has only been around since summer (in the Northern Hemisphere)

4. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 4 Veteran Players R. Vose, Chair (NCDC) J. Bates (NCDC) L. van de Berg (EUMETSAT) M. Bosilovich (NASA) J. Comeaux (NCAR) G. Compo (ESRL) P. Jones (UEA) K. Onogi (JMA) P. Steinle (BOM) P. Thorne (UK Met Office) S. Uppala (ECMWF) J. Woollen (NCEP) S. Worley (NCAR) C. Zou (NESDIS)

5. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 5 4 Terms of Reference (TOR) Review data center holdings worldwide Develop a plan for integrated data sets Oversee progress of Implementing Centers Report regularly to AOPC and WOAP

6. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 6 TOR 1: Review Holdings Data centers –NCAR and NCDC –NCEP, ECMWF, JMA, etc. –Environment Canada, South African Weather Service Data types –In situ and remotely sensed –Atmospheric, oceanic, terrestrial observations –Suitable for use in future reanalyses or extremes studies Data acquisition –Work through official channels –Exploit personal contacts

7. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 7 TOR 2: Develop Data Sets Merge holdings –Flag duplicates and assess quality –Include feedback from past reanalyses if possible Develop standards for data management –Version control –Formats and documentation Identify Implementing Centers –For each type of observation Update in real time –In collaboration with operational providers

8. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 8 TOR 3/4: Track Progress Oversee work –Of Implementing Centers –Adjust plans based changes in circumstance Report accomplishments –Of the group and the Implementing Centers –To AOPC and WOAP –2007 report available upon request

10. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 10 Accomplishments Thus Far Integrated Surface Data Set (ISD) –Synoptic data for surface stations worldwide –NCDC/NCAR partnership –Focus on creating data set inventories and adding data sets International Surface Pressure Databank (ISPD) –Subdaily pressure data for surface stations worldwide –NCDC/ESRL/SPWG partnership –Focus on creating version 2 of this data set

11. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 11 Synoptic Data: ISD Variables: - temperature - dew point - wind direction/speed - cloud cover - et al.

12. 21,198 Stations in ISD

13. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 13 4 New Additions to ISD

14. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 14 NCAR/NCDC Data set Inventory

15. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 15 Surface Pressure: ISPD v2 GCOS/AOPC/OOPC Surface Pressure Working Group (SPWG) Identify, retrieve, digitize, and Q/A subdaily surface pressure data Basis for improved circulation fields and new reanalysis products –ESRL 20 th Century Reanalysis –North Atlantic – European 200-250 yr ACRE Reanalyses

16. ISPD v2 Stations in 2000

17. ISPD v2 Stations in 1950

18. ISPD v2 Stations in 1900

19. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 19 30 Source Data Sets for ISPD Global scale –ISD –NCEP-NCAR BUFR archive National –Australian Bureau of Meteorology –Climate Database Modernization Program (U.S.) –Environment Canada –Hadley Center Regional –READER (Antarctica) –WASA (Northern Europe, Greenland)

20. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 20 Accomplishments to Come Integrated Global Radiosonde Archive v2 (IGRA) –Upper air data for stations worldwide –Focus on adding datasets Satellite Heritage Diagram (SHD) –Inventory of satellite platforms, instruments, periods –Critical component is linking platform with data provider

21. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 21 Variables: - pressure - geopotential height - temperature - dew point depression - wind direction/speed Upper Air Data: IGRA v2

22. 1536 Stations in IGRA v1

23. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 23 Goal: Add Datasets to IGRA China (1970s and 1980s) and Mexico Air Force and MIT datasets (pre-1964) Bronnimann acquisitions (primarily Europe) NCEP and ECMWF collections CDMP data –Malawi, Senegal, Kenya, Mozambique, Niger, U.S., Zambia French West African data –Benin, Burkina Faso, Cameroon, Central African Republic, Chad, Congo, Gabon, Ivory Coast, Guinea, Mauritania, Niger, Senegal, Togo

24. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 24 Satellite Heritage Diagram Part of NOAA-NCDC’s Scientific Data Stewardship initiative Coordinate inventories of satellite data holdings with data centers SHD lists historical and operational platforms, instruments, operational periods Next step is linking each platform with the data provider

26. ACRE Workshop Zurich, Switzerland, June 23-25, 2008 26 Summary Group should benefit the reanalysis community –Review holdings of “data centers” worldwide to identify relevant data sets –Develop a plan for the construction and management of reanalysis-related data sets Several accomplishments are already at hand –ISD and ISPD –IGRA and the Satellite Heritage Diagram We need feedback from you –High-priority data sets –Other activities