1. Hand out: Mars document Content of Sample data Summary from previous meeting with NASA on December 19 th, 2005 Summary from NCEP meeting on NR Comments from ESRL-GSD Comments from RSRL-PSD Presentation and handout Posted at http://www.emc.ncep.noaa.gov/research/osse/NR

2. 1.Period of the Nature run a.Winter and Summer 2.Format of the nature run a.Grib1, Grib2, netCDF b.Model format i.Spectral and model levels ii.Pressure level grid point iii.Low resolution a.1degx1deg 3.Distribution method a.Internet, tape, HDD 4. Variable to be included a.Fixed values used for modeling b.Subset or all c.Post processed values 5. Question to ECMWF a.Technical b.Cost c.Policy Agenda

3. Need one or two good new nature runs which will be used by many OSSEs. Preparation of the nature run consumes a significant amount of resources. If different NRs are used the results can not be compared. Search for the New Nature Run Many nature runs will delay the delivery of the OSSE results

4. New Nature Run (proposed) (ECMWF proposal modified by NCEP and NASA) Low resolution Nature Run (L-NR) Low resolution (T511, L91) with 3 hourly dump Two half year runs for summer and winter. Extra month to remove the drift. (Discard the first month) Daily SST and ICE (Provided by NCEP) Select one or two of the most interesting periods Get initial conditions from L-NR High resolution NR (T799, L91) with 30 min dump Archived in MARS system

5. Sample Data Set ECMWF pre-operational test-suite (expver=29) 24 hour forecast from 10 January 2006 T799, 91 model levels 1.4 GB Surface data 125MB 1x1 degree lat lon 21 level pressure data 30MB Available from http://www.ecmwf.int/datasvc/download/d/download/044d12c4e5f17e76864ef3e030fba3ec Linked from http://www.emc.ncep.noaa.gov/research/osse

6. Summer Summer: 2005 was most active Winter High resolution daily SST and ice available after 2001 Looking for an active year and ElNino year 9798 seems to be active. Data impact for ElNino year may be biased. High resolution SST needs to be processed A year with many storms may not be same as a year with many interesting weather systems Unless there are any significant reason it is sensible to choose the latest year. We have to watch out for winter 2005-2006 Period for the nature runs Suggestion: Spring 2005-Spring 2006

7. Gale Storm Hurricane Force Total 2004-05 5051 2107 440 7598 2003-04 4741 2102 317 7106 2002-03 4299 2088 263 6704 Warnings issued by OPC/NCEP Courtesy of George Bancroft Jim Hoke Eastern Pacific Ocean was active during the winter of 2004-2005 Storm activities over the US main land may be different Storm track diagnostics By Mark Chandler and Jeffrey Jonas http://data.giss.nasa.gov/stormtracks http://data.giss.nasa.gov/stormtracks /

8. Data Format MARS Take ECMWF model out put in spectral and model level There is an option to save as pressure level or isentropic level. Mars will convert to grid space. NOMADS(NCEP) Take post processed fields (pgbfile) in grid space pressure levels http://www.nomad3.ncep.noaa.gov/ncep_data/ Grib1: standard data format. Grads can read Grib2: compress the data better than Grib 1 netCDF: preferred by research community Archive systems

9. You and all prospective users of the NR will have access to the THORPEX MARS server, where the NR will be stored. Should be open access. Then you have full access to the MARS retrieval software, and can costomize your retrieval requests yourself, and issue them yourself. Should be very flexible. I do not yet know the practical limits of how much data could be delivered in a given time - if it is too slow for very large data sets then you might need a US distribution. MARS server Communication with Erik Andersson The IFS (ECMWF's fc model) includes the codes to post-process to pressure levels and/or isentropic levels. The post-processed data are written out of IFS as spherical harmonics, on those levels, in grib. These are then archived in MARS. Subsequently, when the user retrievs data he/she can choose to have the raw spherical coefficients data (possibly truncated), or invoke the horizontal interpolation options within MARS to have the data delivered on any regular Lat/long grid (e.g. 1x1), or on the model's Gaussian grid, for example. The sample data set that you received earlier did not include any isentropic-coordinate data - would that be required too??

10. What format of the data we will consider the official Nature run, which everyone simulate arbitrary data. Definition of the Nature run

11. Sample data T799 Model output1.55 GB 1.4GB/period (T799) + 125MB sfc data 1x1 deg lat-lon 21 level30MB T511 Model output.6GB ?? Low resolution NR (3 hourly one year) T511 spectral2TB Grid data4TB 1x1 lat-lon 21 level100GB High resolution NR (30 min One month) T799 spectral2.5 TB Grid data5 TB Data transfer 1MB/sec2.5TB/month Data size (in Grib 1)

12. High speed internet between NCEP and ECMWF 100Mb/sec- practically 1MB/sec 0.5TB/week About 5TB of NOMADS data are transferred each month Tape Capacity 200GB Most Reliable NCEP has STK9940B tape drive and take 3hour to down load Some institute has LTO There are various type of tapes Tape drive cost about $5K (GSFC does not have tape drive) HDD Price is about $1.00-$1.50/1GB 1.6TB-2TB disk with USB2 are available. Save man power Need extra care for shipping Used by JMA to transfer data between Earth simulator and JMA Security issue may be involved Media

13. Features: Removable hard drive rack to allow quick swapping of hard drives should a drive fail 10/100/1000 Gigabit Ethernet port and Jumbo Frame capability for higher transfer speeds Memeo™ Easy Backup Software Included Four USB 2.0 ports, allowing 4 simultaneous USB connections Built-in FTP server functionality TeraStation 1.6 TB Similar product from LaCie $1600 6.6x8.7x9.5 in 16.9 lb Window, Linux,

14. Options Archived at ECMWF at model out put format Submit MARS request remotely Request to ECMWF and create tape or HDD Produce Archive data for NOMADS format Regular lat-lon grid pressure level in grib Extract at NCEP Low resolution 1x1 lat-lon data in pressure level Save in MARS system as low res or full resolution pressure level data and extract using MARS

15. Question 1. Is it easier to create pressure data and send to NCEP server as archiving spectral out put to MARS system at ECMWF. 2. Can we consider that pressure level data as NR not spectral component. 3. If data is prepared for NOMADS data base it may be possible to post from NCEP but involve significant amount of work. 4. Any cost we have to deal with.

16. NCEP Michiko Masutani NASA/GSFC Lars-Peter Riishojgaard(GMAO), Oreste Reale(GLA) Joe Terry (SIVO) JCSDA John LeMarshall, Wayman Baker, James Yoe NESDIS Thomas J. Kleespies SWA G. David Emmitt, Steven Greco THORPEX Pierre Gauthier(DAOS), David Person(USA), Zoltan Toth (GIFS) ESRL Tom Schlatter (GSD), Jeff Whitaker(PSD) Met Office Richard Swinbank Contacts for the new Nature Run ECMWF Erik Andersson