Contributing Centres to S 2 S database Archiving

Contributing Centres to S 2 S database Archiving centre (3) Data provider (11) ECCC NCEP IRI ECMWF UKMO Météo France ISAC HMCR KMA CMA JMA Bo. M Slide 1 ECMWF Informal Seminar 11 November 2016

S 2 S Models Timerange Resol. Ens. Size Freq. Hcsts ECMWF D 0 -46 T 639/319 L 91 51 2/week On the fly UKMO D 0 -60 N 216 L 85 4 daily NCEP D 0 -44 N 126 L 64 4 4/daily ECCC D 0 -32 0. 45 x 0. 45 L 40 21 weekly Bo. M D 0 -60 T 47 L 17 33 2/weekly Fix JMA D 0 -34 T 319 L 60 25 2/weekly Fix KMA D 0 -60 N 216 L 85 4 daily CMA D 0 -45 T 106 L 40 4 daily Fix 1886 -2014 CNRM D 0 -32 T 255 L 91 51 weekly Fix 1993 -2014 2/monthly 15 CNR-ISAC D 0 -32 0. 75 x 0. 56 L 54 40 weekly Fix 1981 -2010 6/month 1 HMCR D 0 -63 1. 1 x 1. 4 L 28 20 weekly Fix 1981 -2010 weekly 10 Slide 2 ECMWF Informal Seminar 11 November 2016 Hcst length Hcst Freq Past 20 y Hcst Size 2/weekly 11 4/month 3 1999 -2010 4/daily 1 On the fly 1995 -2014 weekly 4 1981 -2013 6/month 33 1981 -2010 3/month 5 On the fly 1996 -2009 4/month 3 daily 4 On the fly 1993 -2015 Fix

S 2 S models Slide 3 Models Ocean coupling Active Sea Ice ECMWF YES UKMO YES NCEP YES ECCC NO NO Bo. M YES Planned JMA NO NO KMA YES YES CNRM YES ISA-CNR NO NO HMCR NO NO ECMWF Informal Seminar 11 November 2016

S 2 S Database current status Open access to researchers since May 2015 from ECMWF and Nov. 2015 from CMA. Subset of the database also available in netcdf from IRI data library. Currently, data from all centres except KMA (will become available soon) are available. Total size of the database so far: 43 Tbytes - real-time: 7 Tbytes - re-forecasts: 36 Tbytes Plans – End of 2016: all 11 Data Providers – Add new ocean sub-surface and sea-ice variables – Compute and archive indices such as MJO RMMs, SSW index, Weather regimes, Tropical storm tracks, Monsoon indices to be available for the research community from ECMWF and IRI servers. Slide 4 ECMWF Informal Seminar 11 November 2016

New variables to be added Atmosphere: Vertical Velocity (currently archived at 500 h. Pa only) to be archived in all pressure levels: from 1 st January 2017 in some S 2 S models Ocean/sea-ice variables: • • • Sea surface salinity Depth of 20 deg isoth Mixed layer depth Heat content at top 300 m Salinity in top 300 m U surface current V surface current Sea surface height Sea ice thickness These new variables will be archived in netcdf in MARS. Work is ongoing to archive ocean data in the MARS system (project for ERA-CLIM 2). New variables will not be ready for all the S 2 S models straight away. For models with fixed climatology, we may need to wait the next version of these model. Slide 5 ECMWF Informal Seminar 11 November 2016

ECMWF S 2 S website: s 2 s. ecmwf. int CMA website: s 2 s. cma. cn Slide 6 ECMWF Informal Seminar 11 November 2016 http: //apps. ecmwf. int/datasets/data/s 2 s

Use of the S 2 S database § § 600 registered users from 65 countries at ECMWF 140 register users mostly from China at CMA ECMWF Server Slide 7 ECMWF Informal Seminar 11 November 2016

BAMS article on S 2 S database to be published in Jan 2017 Slide 8 ECMWF Informal Seminar 11 November 2016 October 29, 2014

S 2 S model documentation Slide 9 ECMWF Informal Seminar 11 November 2016 October 29, 2014

Initialization of land surface Documentation § A questionnaire has been produced by GEWEX/GLASS § The S 2 S Project Office has sent the questionnaire to 11 the data providers § So far 9 have replied, and the soil initialization documentation is now included in their model documentation in the ECMWF S 2 S website. § Have not replied yet: NCEP and HMCR Slide 10 ECMWF Informal Seminar 11 November 2016 October 29, 2014

Questionnaire on Land ICs 1. What is the land surface model (LSM) and version used in the forecast model, and what are the current/relevant references for the model? Are there any significant changes/deviations in the operational version of the LSM from the documentation of the LSM? 2. How is soil moisture initialized in the forecasts? (climatology / realistic / other) • If “climatology”, what is the source of the climatology? • If “realistic”, does the soil moisture come from an analysis using the same LSM as is coupled to the GCM forecasts, or another source? Please describe the process of soil moisture initialization. • If “other”, please describe the process of soil moisture initialization. • Is there horizontal and/or vertical interpolation of initialization data onto the forecast model grid? If so, please give original data resolution(s). • Does the LSM differentiate between liquid and ice content of the soil? If so, how are each initialized? • If all model soil layers are not initialized in the same way or from the same source, please describe. 3. How is snow initialized in the forecasts? (climatology / realistic / other) • If “climatology”, what is the source of the climatology? • If “realistic”, does the snow come from an analysis using the same LSM as is coupled to the GCM forecasts, or another source? Please describe the process of soil moisture initialization. • If “other”, please describe the process of soil moisture initialization. • Is there horizontal and/or vertical interpolation of data onto the forecast model grid? If so, please give original data resolution(s) • Are snow mass, snow depth or both initialized? What about snow age, albedo, or other snow properties? 4. How is soil temperature initialized in the forecasts? (climatology / realistic / other) • If “climatology”, what is the source of the climatology? • If “realistic”, does the soil moisture come from an analysis using the same LSM as is coupled to the GCM forecasts, or another source? Please describe the process of soil moisture initialization. • If “other”, please describe the process of soil moisture initialization. • Is the soil temperature initialized consistently with soil moisture (frozen soil water where soil temperature ≤ 0°C) and snow cover (top layer soil temperature ≤ 0°C under snow)? • Is there horizontal and/or vertical interpolation of data onto the forecast model grid? If so, please give original data resolution(s) • If all model soil layers are not initialized in the same way or from the same source, please describe. October 29, 2014 Slide 11 ECMWF Informal Seminar 11 November 2016