L arge-scale U ncoupled A ction U pdate

1. GSWP Large-scale Uncoupled Action Update Paul Dirmeyer Taikan Oki

2. GSWP Large-scaleUncoupledActionUpdate Paul Dirmeyer Taikan Oki

3. GSWP GLASS Framework

4. GRP GMPP GHP

5. US-GEWEX Project Office (Water Cycle Office) SSG US US

6. nd Global Soil Wetness Project • Multi-model investigations into variability and predictability of the global • surface water and energy cycles • This phase of the project will take advantage of: • The10-year ISLSCP Initiative 2 data set • The ALMA data standards developed in GLASS • The infrastructure developed in the pilot phase of GSWP • GSWP-2 represents an evolution in multi-model large-scale land-surface modeling with the following features: • The ten year length of the ISLSCP Initiative 2 allows for a better investigation of interannual land surface climate variability. • The ISLSCP Initiative 2 data set will contain more than one rendition of many global fields, produced by different methods and scientists. This gives us a straightforward means to investigate LSS sensitivity to the choice of forcing data sets. • Application and further development of the methods of calibration and validation of LSSs with in situ and remote sensing data. www.iges.org/gswp/ gswp@cola.iges.org

7. GSWP-2 data sets GSWP-2 data sets for parameter specification, meteorological forcing, and validation have been produced. The data sets are based on the ISLSCP-Initiative II data, but many of the fields represent additional processing, such as the production of “hybrid” data sets combining gridded observations (low temporal resolution) with model reanalysis (high time resolution). This hybridization removes systematic errors in the reanalysis data, providing a superior set of forcing data for the land surface models.

8. GSWP Information System Results will be made available to participants as data sets accessible from one or more GrADS/DODS servers (GDS). Using the ALMA data exchange standards, and DODS subsetting capabilities, individual LSSs will be able to run globally each time step, each grid point from start to finish, or in any other sequence of integration. Additionally, standard and customizable browse images will be made available to the public via the web. ALMA:www.lmd.jussieu.fr/ALMA/ DODS:www.unidata.ucar.edu/packages/dods/ GDS:grads.iges.org/grads/gds/ LIS:lis.gsfc.nasa.gov/

9. The data sets have been posted online for community access. There are three DODS servers for accessing the data directly over the internet: North America: http://www.monsoondata.org:9090/dods/ Europe:  http://dods.ipsl.jussieu.fr/ Asia:  http://ftp.tkl.iis.u-tokyo.ac.jp:9090/dods/ The North American and Asian servers are GDS. There is also FTP access to the individual files at: ftp://monsoondata.org/(password required) and direct HTTP access to files at: http://dods.ipsl.jussieu.fr/ Data servers

10. DODS Access • The DODS (now called OpenDAP) framework allows clients such as model codes, visualization software, or other programs to access large and varied data sets from servers on the internet, just as if they were accessing files on local computer disks (http://www.unidata.ucar.edu/packages/dods/, http://opendap.org/). • To use this new technology, some additional software must be installed on the client’s home system (usually DODS-enabled libraries for existing software or compilers). • An FAQ page has been set up to help GSWP participants with these and other issues at: http://www.iges.org/gswp/faq.html.

11. ICC • Optical or Internet Submission • Status (Taikan?)

12. IIS-UT DB System • 500TB HDS • Receiving AVHRR, VISSR and MODIS • GSWP DC • Will be used for CEOP DC • JMA GPV

13. AMS 2004 • There will be a GSWP-2 session at the AMS 18th Conference on Hydrology, AMS Annual Meeting (Seattle, Washington, USA, 11-15 January 2004) to present preliminary results of the experiment. • 12 Abstracts submitted to GSWP-2 session. Scheduling now underway.

14. GRP/GMPP exchange via GSWP-2 • Plans are being made for a collaborative effort between GRP and GMPP. • Bill Rossow has been communicating with Paul Dirmeyer and Jan Polcher about using GSWP estimates of surface (latent and sensible) heat fluxes over land for helping to close the global surface energy budget. • GSWP will also pursue sensitivity studies using ISCCP estimates of surface radiation for model forcing, compared to SRB and reanalysis estimates, to understand how uncertainty in our estimates of radiation propagate into the terrestrial hydrologic cycle.

15. Validation issues in GSWP-2 Preliminary work at COLA • Assessment of in situ data • Assessing existing global data sets • Remote sensing efforts

16. “SCAN’t” • Very few operational stations during 1994-95 • Data unreliable before ~1997

17. Soil Wetness In situ measurements Global Soil Moisture Data Bank • Very few and scattered soil wetness measurements. Some of the best long-term networks have decayed in last decade. Still gaps.

18. Long-term model-derived and remote sensing products: Comparison of existing global data sets 1950-1999 1948- 1979-1999 1979- 1988- * 1992- * No data 6/1990-12/1991

23. Surface soil wetness • ERS product much better than SSM/I (which is really a surface water product, even though it is called a soil wetness index). • R2 performs poorly for sfc SW as well. • Data for China and Mongolia do not overlap the ERS period (1992-).

24. Top 1m soil wetness • R2 is clearly inferior. • Other products have strong/weak regions

26. For anomalies, CPC product appears best for column soil wetness, GOLD (GSWP-style) is 2nd. • GOLD is better on total signal (better phasing of annual cycle). • ERS is very good, but only available for surface, and record is shortest of all products. Performance of various products Sfc 1m

29. Finally • 15 September deadline for baseline runs will probably slip to October. • Start on QC, comparison, and test cases this Fall. • Public presentation of preliminary results at AMS (Seattle, Jan 2004).