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Initial Results of Wind Lidar Observing System Simulation Experiments

Initial Results of Wind Lidar Observing System Simulation Experiments. Zaizhong Ma and Lars Peter Riishojgaard Joint Center for Satellite Data Assimilation & University of Maryland Baltimore County Michiko Masutani NCEP Environmental Modeling Center. Overview:. Wind Lidar OSSEs

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Initial Results of Wind Lidar Observing System Simulation Experiments

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  1. Initial Results of Wind Lidar Observing System Simulation Experiments Zaizhong Ma and Lars Peter Riishojgaard Joint Center for Satellite Data Assimilation & University of Maryland Baltimore County Michiko Masutani NCEP Environmental Modeling Center

  2. Overview: • Wind Lidar OSSEs • OSSEs setup • Initial results • Anomaly Correlation coefficients (500hPa Geopotential Height) • Tropical Wind RMSE (200hPa and 850hPa) • Summary and Future work Working Group on Space-based Lidar Winds, Miami

  3. Wind LidarOSSEs: • Impact experiments carried out as part of NASA-NOAA Joint OSSE collaboration • Common Nature Run supplied by ECMWF • Shared simulation of reference observations; contributions by NESDIS, GMAO, NCEP, et al. • Wind Lidar OSSE project funded by NASA (Kakar and Lee) under ROSES 2007 Working Group on Space-based Lidar Winds, Miami

  4. Experiment Setup: • NCEP GFS coupled with GSI data assimilation system • GFS at T-126 horizontal resolution • “OSSE period”: July 01-Aug 15，2005 (simulated) • Most observing systems used for routine operational NWP included, except GPSRO and IASI Total rejection rate around 6% Number of lidar observations per analysis cycle (shown only for 00Z) Working Group on Space-based Lidar Winds, Miami

  5. Experiment Setup (cons): • Four experiments, all verified against Nature Run • CTRL : Assimilating the “observation” from NR, except Lidar wind data • NOUV : CTRL without raob (220, 221 and 232) • NONW: CTRL without all wind data • DWL : CTRL + hybrid Satellite lidar wind data 0112 July …… 1500 Aug 0118 July Cycling experiments with 6h assimilation window from July 01 to Aug 15, 2005 EXP: CTRL, NOUV, NONW, DWL 5-day Forecast 5-day Forecast Five-day forecast launched every day at 00, 06, 12, 18Z Working Group on Space-based Lidar Winds, Miami

  6. 500hPa HGT anomaly correlation coefficients NH SH 1.8% 0.8% More fine scales Working Group on Space-based Lidar Winds, Miami

  7. Time series of 500hPa geopotential height AC NH SH Day 1 Candidates for additional study Day 3 Day 5 Working Group on Space-based Lidar Winds, Miami

  8. Time series of 500hPa geopotential height AC (con.) NH: 500hPa SH: 500hPa Working Group on Space-based Lidar Winds, Miami

  9. RMSE: 200, 850hPa Wind error in tropics 200hPa 850hPa Working Group on Space-based Lidar Winds, Miami

  10. Time series of 200, 850hPa Wind RMSE in tropics 200 hPa 850 hPa Day 1 Day 3 Day 5 Working Group on Space-based Lidar Winds, Miami 10

  11. Time series of Wind RMSE in tropics Forecast: Day 1 Forecast: Day 5 Working Group on Space-based Lidar Winds, Miami

  12. Summary and Future work: • A comprehensive OSSE system has been developed under the Joint OSSE collaboration • Initial results simulating expected impact of GWOS observations on NCEP GFS system are very encouraging • Small positive impact in North Hemisphere (~ 1%) • Larger positive impact in South Hemisphere (~ 2%) • Very large positive impact in tropics • Future work: special case study (shown in Slide 7), increasing horizontal resolutions (T382) … Working Group on Space-based Lidar Winds, Miami

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