Observing System Simulation Experiments at CIMSS

1. Observing System Simulation Experiments at CIMSS By CIMSS/OSSE Team : Bob Aune ; Paul Menzel ; Jonathan Thom Gail Bayler ; Chris Velden ; Tim Olander and Allen Huang Cooperative Institute for Meteorological Satellite Studies University of Wisconsin 7 June, 1999

3. Road Map 1) Geostationary Interferometer Initial Focus Soundings (S) = T, Td Winds (W) Soundings plus Winds Soundings, Winds plus Conventional Data (CD) 2) First: Simulated Products; Followed by Derived Products from Simulated Radiances 3) Investigation of LIDAR Winds on top of S, W, and CD

10. UW-NMS Domain in the Eta 104 grid

11. OSSE Control (Nature) Verification

12. OSSE Control (Nature) Verification

13. OSSE Control (Nature) Verification

19. 4. Assess The Impact The impact of the observations will be assessed by objectively measuring the ability of each observing system to steer the resulting 12-hour forecasts toward the “true” atmosphere. Observation count T/Td* WIND#Experiment None None No Observations (NO) = NO OBS ~5000 ~6000 Geo. Radiometer (GR) = GEO-R ~5000 ~6000 Geo. Interferometer (GI) = GEO-I ~6200 ~12000 Perfect Observations (PO) = OPTIMAL * : profile # : vector

29. Wind Objectives 1) To assess the value of wind observations to operational mesoscale numerical weather forecasts in a controlled environment 2) To assess the incremental value of current and future geostationary infrared/visible, and LIDAR wind measurements

30. Wind Profile OSSE Simulated Error for Clear Water Vapor Winds (m/s) Pressure (mb) GEO-R GEO-I* 200 N/A 4 300 6 4 400 5.5 3.5 500 5 3 700 N/A 2.5 * Projected 30-40 % improvement over Geo-R

31. Wind Profile OSSE Simulated Error for Cloudy Water Vapor & IR Winds (m/s) Pressure (mb) GEO-R GEO-I* 200 5.5 3.6 300 5 3.3 400 4.5 2.9 500 4.5 2.9 700 4.0 2.6 850 3.5 2.3 * Projected 30-40 % improvement over Geo-R Cloud altitude defines wind level

32. Winds OSSE Results

33. Winds OSSE Results - Continued Winds OSSE results are preliminary

34. Winds Versus Soundings

35. Winds Versus Soundings - Continued

36. Current Status 1) OSSE is designed, implemented, and pilot experiment conducted. 2) Winds counterpart, sounding profiles, are successfully assimilated and forecast impact assessed for a case study. 3) Winds assimilation is performed and is under detailed analysis now. 4) CIMSS OSSE home page: http://cimss.ssec.wisc.edu/model/osse/osse05.html

37. Plans for the On-going Work 1) Simulate winds using radiances 2) 14 day test periods (winter and spring) 3) Conventional observing system evaluation 4) Low Earth Orbit (LEO) OSSE 5) Temperature/water vapor sounding and winds combined OSSE 6) LIDAR wind OSSE

38. Hurricane Bonnie Wind and Cloud Fields Wind Vectors : Red - 1 km level Green - 14 km level Clouds : Light gray - Ice Cloud Dark Gray - Water Cloud

39. Hurricane Bonnie Wind and Cloud Fields Wind Vectors : Magenta Stream Lines : Green (@ 4 km) Clouds : Light gray - Ice Cloud Dark Gray - Water Cloud

40. GOES Radiances Simulation Verification

41. Wind Tracking Verification

42. Wind Tracking Verification - Continued