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Providing Operational GSI and EnKF to the Research Community: 2016 Update

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17th Annual WRF Users Workshop, 27 June -1 July, 2016, Boulder, CO Providing Operational GSI and EnKF to the Research Community: 2016 Update Hui Shao1,2, Ming Hu1,3, Don Stark1,2, Chunhua Zhou1,2, and
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17th Annual WRF Users Workshop, 27 June -1 July, 2016, Boulder, CO Providing Operational GSI and EnKF to the Research Community: 2016 Update Hui Shao1,2, Ming Hu1,3, Don Stark1,2, Chunhua Zhou1,2, and Kathryn Newman1,2 1 Developmental Testbed Center (DTC) Center for Atmospheric Research (NCAR)/Research Applications Laboratory (RAL) 3 National Oceanic and Atmospheric Administration (NOAA)/Earth System Research Laboratory (ESRL) 2 National Special acknowledgement to Xin Zhang, Christina Holt, Zaizhong Ma,Yanqiu Zhu, John Derber, Michael Lueken, Mariusz Pagowski, the National Centers for Environmental Prediction (NCEP) Environmental Modeling Center (EMC), and other code developers and collaborators Sponsored by NOAA and NCAR (supported by NSF) Data Assimilation (DA) Software Gridpoint Statistical Interpolation (GSI) analysis system: Originally developed by NCEP/EMC Community system since 2009 Active developers from various operational and research institutes and agencies Centralized support through the Developmental Testbed Center (DTC) Operational applications: NCEP: Global Forecasting System (GFS), North American Mesoscale system (NAM), Hurricane WRF (HWRF), Real-Time Mesoscale Analysis (RTMA) NOAA: Rapid Refresh (RAP), High-Resolution Rapid Refresh (HRRR) NASA: Goddard Earth Observing System (GEOS) Air Force: Mesoscale forecast analysis system Ensemble Kalman Filter (EnKF) based analysis system: Originally developed by NOAA/ESRL Community system since 2015 Applications: Operational as part of the GFS data assimilation (GDAS) system (GSI-EnKF hybrid) Can be used for regional models and systems, e.g., HWRF, NAM, ARW 2 Enhanced Connections with Developers Data Assimilation Review Committee Meets regularly to communicate about ongoing GSI and EnKF development and coordinate development plans Reviews all code changes committed to the code repository New membership added in April 2016: Joint Center for Satellite Data Assimilation (JCSDA) JCSDA NOAA/ f ni. o PSD/U d Marylan NCEP/ EMC NASA/ GMAO GSI/EnKF DTC (chair) NC A R NOAA/ GSD NESDIS AF Research community Member added in 2016 Members since 2010 Member added in 2011 Members added in What s New? GSI v3.5/enkf v1.1 - Release scheduled for July 2016 Supported DA Techniques GSI: 2DVar 3DVar 3D (hybrid) EnVar 4D (hybrid) EnVar EnVar : Variational (Var) DA using ensemble background covariances Hybrid: Variational DA using a combination of climatological and ensemble covariances - Nomenclature adopted from Lorenc (2013) Will be implemented for NCEP GFS in 2016 EnKF: using GSI as the observation operators (assimilating same observation types as GSI) Ensemble Square Root Filter (EnSRF) Parallelization scheme based on NCAR Data Assimilation Research Testbed (DART) toolkit Local Ensemble Transform Kalman Filter (LETKF) 5 4D Hybrid EnVar Climatological (Static) background error covariance Incorporating ensemble backgrounderror information through extended control variable yt=1 yt=2 yt=k t Enst=1 Enst=2 Enst=k x : analysis increment vector n: n-th ensemble member k: k-th time bins Bf: Static background error covariance α: extended control variable L: correlation matrix H: foreword operator y: observation vector R: observation error covariance 4D increments prescribed through linear combination of 4D ensemble perturbations plus static contributions 6 Time-variant Information from 4D EnVar 3DVar Posters: P24-Zhou, Chunhua, et. al, Initial assessment of the GSI-based 4D hybrid ensemblehybrid variational data assimilation and its application for regional forecasts 3D P25EnVarNewman, Kathryn, et. al, Investigating the capability of GSI four-dimensional ensemble variational data assimilation for WRF-ARW applications Hybrid 4D EnVar! 7 Enhanced Capabilities: GSI-Chem Re-introduced GSI-chem capabilities Created regression tests for GSI-chem (regular maintenance) Assimilates pm2.5, pm10, and the Moderate Resolution Imaging Spectroradiometer (MODIS) Aerosol Optional Depth (AOD) Tested for the Community Multi-scale Air Quality (CMAQ) model and WRF-chem Future: Satellite: VIIRS, OMI, GOES-R ABI, etc VIIRS dust/smoke masks Extend CRTM for aerosol beyond GOCART Bias (left) and spatial correlations (right) with and without pm2.5 DA (Mariusz Pagowski, 2014) 8 New Features: All-sky Microwave Radiance DA AMSU-A: channels 1-5, and 15 over ocean Thick clouds that were excluded from clear sky assimilation are now assimilated under all-sky condition Rainy spots are excluded from both conditions Symmetric observation error Situation-dependent observation error inflation New all-sky bias correction Clear sky O-F for Cloud liquid water (CLW) Observed CLW All sky (Yanqiu Zhu, 2015) 9 New Data Types: Himawari-8 AHI Advanced Himawari Imager (AHI) clear-sky radiances Water vapor channels 8, 9, and 10 QC based on SEVIRI mask Newcloud instruments/data: Impact study using GSI 4D pm10 EnVar Aerosl: ISS-RapidScat winds CTL GOES CAWV AMV AMV AMV+RAD GCOMW1 AMSR2 RAD GPM GMI Megha-Tropiques SAPHIR Himawari AHI Acronyms should be found from GSI and EnKF s user s guide (Zaizhong Ma, 2016)! 10 Observations Types (I) Radiosondes Conventional Pibal winds Synthetic tropical cyclone winds Conventional aircraft reports ASDAR aircraft reports MDCARS aircraft reports Dropsondes Surface land observations Surface ship and buoy observation Wind profilers: US, JMA Tall tower winds SSM/I wind speeds Satellite wind & retrievals MODIS IR and water vapor winds GMS, JMA, METEOSAT, and GOES cloud drift IR and visible winds GOES hourly IR and cloud top winds QuikSCAT, ASCAT, and OSCAT wind speed and direction ISS-RapidScat winds GOES CAWV AMV AVHRR winds EUMETSAT and GOES water vapor cloud top winds METAR cloud observations SSM/I and TRMM TMI precipitation estimates Doppler radial velocities VAD (NEXRAD) winds Radar Reflectivity Mosaic Radar Tail Doppler Radar (TDR) radial velocity and super-observation Flight level and Stepped Frequency Microwave Radiometer (SFMR) High Density Observation (HDOB) from reconnaissance aircraft GPS precipitable water estimates GPS GPS Radio occultation (RO) refractivity and bending angle profiles Doppler wind Lidar data Others SBUV ozone profiles, MLS (including NRT) ozone, and OMI total ozone SST Tropical cyclone VITAL (TCVital) PM2.5, PM10 AOD: MODIS 11 Observations Types (II) SBUV: n17, n18, n19 HIRS: metop-a, metop-b, n17, n19 Satellite Radiance GOES_IMG: g11, g12 AIRS:aqua AMSU-A: metop-a, metop-b, n15, n18, n19, aqua AMSU-B: metop-b, n17 MHS: metop-a, metop-b, n18, n19 SSMI: f14, f15 SSMIS: f16, f18, f19 GCOMW1 AMSR2 AMSRE: aqua GPM GMI SNDR: g11,g12, g13 Megha-Tropiques SAPHIR IASI: metop-a, metop-b Himawari AHI GOME: metop-a, metop-b OMI: aura SEVIRI: m08, m09, m10 ATMS: Suomi NPP CRIS: Suomi NPP Acronyms should be found from GSI and EnKF s user s guide 12 Other Update: GSI algorithm/application update Added new AMV algorithm (requires a new BUFR table) Improved quality control (QC) for regional assimilation of Global Positioning System Radio Occultation (RO) bending angle Updated observation thinning algorithms Added capability to output ensemble spread Updated near surface sea temperature (NSST) capability Updated RTMA capability Updated HWRF/GSI capability EnKF update Fixed threading bugs in LETKF Use LAPACK routine for eigenanalysis Added new namelist options Added capability to update multiple time background ensembles Optimized code and improved computational efficiency Libraries update Switched to new version of the Community Radiative Transfer Model (CRTM) (v2.2.3) Added capability to use the NCEP I/O library nemsio Some diagnostic and/or fixed files might have been modified as well 13 Code Test Repository code tests: EMC & DTC Operational parallel tests: operational centers Community release tests: DTC Compilers Versions PGI V12.5, V13.3, V13.9, V14.7, V14.9, V14.10, V15.1, V15.7, V15.10, V16.1 Intel V12.1.0, V12.1.4, V12.1.5, V13.0.1, V13.1.1, V13.1.2, V14.0.1, V14.0.2, V14.0.3, V15.0.0, V15.0.1, V15.0.3, V16.0.0, V16.0.1, V GNU V5.3.0, V6.1.0 All changes made during code tests are committed back to the code repository 14 Call for Research Contributions Repository access Open to researchers Contact the DTC for applications Code transition support DTC visitor program: Proposals to work directly with the GSI system and/or the NOAA EnKF system are strongly encouraged. Year-around applications Apply via the DTC visitor program website: DTC DA webpage: GSI: EnKF: (shared helpdesk and contact) 15 Future Plans Annual code release is scheduled for early July 2016 Community GSI v3.5, EnKF v1.1 Improved helpdesk support Transitioning to a RT ticketing system with better tracking Unified compilation build system Operational centers and the research community will use the same multiple-platform build tool Code test and evaluation Apply 4D EnVar to HRRR Encourage community contributions and collaborations 16 Acronyms and Abbreviations NASA: National Aeronautics and Space Administration GMAO: Global Modeling and Assimilation Office NESDIS: National Environmental Satellite, Data and Information Service GSD: NOAA ESRL s Global Systems Division PSD: NOAA ESRL s Physical Sciences Division AF: Air Force 17
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