610.1/GMAO GEOS-5 Data Production Overview Gi-Kong Kim GESDIS Staff - August, 20101

Office Head Michele Rienecker ESMF Production I&T; Ops SW; Production; Sys admin SSD I & Forecasts; ODAS; LDAS; Var & Pred IT Liason Modeling AGCM; LSM; OGCM; CGCM; Integration Constituents Ozone; Aerosols; Ocean Bio; CCC Assimilation Satellite Data; Analysis; Monitoring & Valid; OSSEs GMAO has been established as a core resource in the development and use of satellite observations through the integrating tools of models and assimilation systems. Global ocean, atmosphere and land surface models are developed as components of assimilation and forecast systems as well as for addressing the weather and climate research questions. The GEOS-5 data assimilation system (DAS) is based on the GEOS-5 Atmospheric General Circulation Model (AGCM) integrated with the Gridpoint Statistical Interpolation (GSI) Analysis. Introduction to 610.1/GMAO & GEOS-5 GESDIS Staff - August, Focus of the presentation: Introduce GESDIS staff to the GEOS-5 production at a high level and the collaboration between GES DISC and GMAO for the end-to-end GEOS-5 production operations

GMAO Products Page:

GEOS-5 Data Assimilation GESDIS Staff - August, GEOS-5 integrates the observations and models to produce the best representation of the atmospheric state GEOS-5 covers the entire globe with physically consistent data

GEOS-5 Data Assimilation Schematic GESDIS Staff - August, 20105

Production Streams GESDIS Staff - August, Near Real Time (NRT): Assimilation products (DAS), Forecasts ( Reprocessing for Instrument Teams Long-term re-analysis: MERRA Customized products: - CERES team: uses controlled set of input obs to minimize data shock when a new data type is introduced in the mid-stream - YOTC

TypeDescription# of Var (175 total) Freq inst2d_met_x2D meteorological state, instantaneous at the surface, on a single-level, or vertically integrated 278/day inst3d_met_p3D meteorological state, instantaneous on pressure coordinates84/day tavg2d_met_x2D meteorological state, time-averaged at the surface, on a single-level, or vertically integrated 798/day tavg3d_prs_v3D pressure information, time-averaged on lcv coordinates34/day tavg3d_dyn_v3D dynamics fields, time-averaged on lcv coordinates144/day tavg3d_cld_v3D cloud & precipitation fields, time-averaged on lcv coordinates 104/day tavg3d_met_e3D meteorological fields, time-averaged on lcv coordinate layer edges 64/day tavg3d_mst_v3D moisture tendency fields, time-averaged on lcv coordinates74/day tavg3d_tmp_v3D temperature tendency fields, time-averaged on lcv coordinates 114/day tavg3d_wnd_v3D wind tendency fields, time-averaged on lcv coordinates104/day GEOS NRT Assimilation Products GESDIS Staff - August, V5.2.0 data are in HDF-4 at ½ deg spatial resolution. The next version, v5.6.2, will be in HDF-5 at ¼ deg.

GEOS-5 Data Users GESDIS Staff - August, EOS Instrument Teams: CERES, MLS, TES, CALIPSO, MODIS/Land Science Support: GMI-CTM, GEOS-CHEM (Harvard), U of MD, … Other Projects: GEWEX/CEOP, POWER, FLASHFlux, SRB, YOTC, GLDAS, Flood Warning, SPARC-IPY, JAXA/SMILES, … Field Experiments: Recently ARCTAS, TIGERZ-II, HIPPO, GloPac, GRIP (Aug, 2010) General Users of MERRA products at GES DISC/MDISC

Input Observations for NRT Production GESDIS Staff - August, Most of the input data for NRT are obtained via GES DISC. Some of the input data for non –real time use are obtained directly from other sources such RSS, ECMWF, NCAR, … All the input data are in BUFR format Currently working with NRT AIRS data team at GES DISC to acquire AIRS radiance data from LANCE. Data TypeSourceActive/PassiveTime Period Used TEMPERATURE Radiosonde, Aircraft, Dropsonde Sea Surface, Surface Marine NCEP GDAS Active 8/14/ Present PRESSURE METAR, Land Station, Marine Surface Radiosonde Station NCEP GDASActive8/14/ Present RADIANCES AQUA AIRS & AMSUA AMSUA, AMSUB, HIRS3 NOAA SERVER NCEP GDAS Active 8/14/ Present WINDS Radiosonde, PIBAL, Wind Profiler, NEXRAD, Aircraft, Dropsonde, Surface Marine Atlas Buoy, Water Vapor, IR/VIS Cloud Drift NCEP GDAS Active 8/14/ Present MOISTURE Radiosonde, Surface Marine TMI Rain Rate Dropsonde NCEP GDAS Active Passive 8/14/ Present OZONE SBUV NCEP GDASActive8/14/ Present

Data Processing GESDIS Staff - August, Processing done using HEC resources at NCCS - Uses queues of sizes ranging from 144-cpu (1/2 deg) to 720-cpu (1/4 deg) on the NCCS ‘discover’ system - GCM performance scales well as the number of CPUs is increased, but less so with GSI - Throughput: 6dd/d – 10dd/d, 30dd/d desired (MERRA: 10dd/d) (On the average, GEOS-5 system is upgraded once a year) - High throughtput vs high spatial resolution * NRT production timeline Z L 7pm 1am 7am 1pm 7pm Data 18z 0z 6z 12z 0Z 5-day Fcst 6Z DAS Post Proc 18Z DAS Post Proc 0Z DAS Post Proc 12Z DAS Post Proc 12Z 5-day Fcst AIRS GDAS AIRS GDAS AIRS GDAS AIRS GDAS

Quality Assurance GESDIS Staff - August, Online QA - Input observations are screened before the analysis - Output QC by QuADS (range check, hydrostatic check,..) Offline product quality assessment - Monitoring meeting held weekly - Various analysis and monitoring tools are developed and used E.g., OBS2HTML diagrams, forecast skill scores, O-F and O-A stats, comparison with data from other centers (NCEP, ECMWF,..)

Data Distribution GESDIS Staff - August, NRT data and MERRA via GES DISC - NRT data distributed to subscribed users after predefined subsetting. - MERRA: On web-based online data system with various tools for data search and order (Mirador), subsetting, data transport (ftp, openDAP, GDS), visualization (Giovanni). MERRA user metrics ( show that data are being accessed by users from over the globe at a steady rate. - mdisc: NCCS data portal for mission support and science collaborators - Forecasts as well as assimilation products are made available for mission support - Data retained online for 6 months - GRIP mission support page:

Source for more information GESDIS Staff - August, GMAO research page: Technical report: ‘The GEOS-5 Data Assimilation System – Documentation of Version 5.0.1, 5.1.0, and 5.2.0’