1 / 18

Rolf Langland NRL-Monterey

Plans for Evaluation of Lidar Wind Observations at NRL-Monterey. Working Group on Space-Based Lidar Winds 05 Feb 2008. Rolf Langland NRL-Monterey. Outline of Talk. T-PARC plans - Falcon and P-3 Data Assimilation Issues Potential Benefit of Space-Based Lidar Wind Observations.

elwyn
Télécharger la présentation

Rolf Langland NRL-Monterey

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Plans for Evaluation of Lidar Wind Observations at NRL-Monterey Working Group on Space-Based Lidar Winds 05 Feb 2008 Rolf Langland NRL-Monterey

  2. Outline of Talk • T-PARC plans - Falcon and P-3 • Data Assimilation Issues • Potential Benefit of Space-Based Lidar Wind Observations

  3. Falcon plans: T-PARC 2008 airport base: Atsugi, Japan (tbc with US Navy) alternative airports: Okinawa, Misawa, Iwo Jima (?), Korea (?) flight time: 90 h plus 30 h for transfer planned schedule (depending on funding) total: 7-8 weeks incl. transfer/integration takeoff in Germany: 21 Aug 2008 arrival in Japan: 24/25 August 2008 last day in Japan: 4 October (~6 weeks in Japan) arrival in Germany: 7/8 October real-time data: dropsondes near real-time: aircraft in-situ, lidar quicklooks non-realtime: lidar data lidar aircraft manager: Andrea.Hausold@DLR.DE max. range: 1350-1600 NM max altitude: 12.8 km (42 kft)

  4. Falcon plans: T-PARC 2008 wind lidar data: horiz resolution: ~10 km vert. resolution: 100 m number of wind profiles in Japan: 5400 number of profiles on transfer though Siberia: 1800 (the permission for observations in Russia is not certain yet) expected lidar coverage based on the experience from A-TReC 35% for 10-km horizontal resolution 55% for 40-km horizontal resolution Research interests: observation targeting extratropical transition of tropical cyclones and downstream impact value of new observing systems (lidars) tropical moisture export

  5. NRL plans: T-PARC 2008 • Targeting Guidance for TC forecasts – • NOGAPS singular vectors • Adjoint-based observation impact evaluation (after reanalysis with T-PARC lidar observations) • Conventional observation addition and denial forecast experiments (after reanalysis)

  6. NOGAPS Singular Vector Targeting Guidance Observation Target Time Forecast Verification Time Target area for additional observations

  7. Example of NOGAPS-NAVDAS Adjoint-based Observation Impact Effect of observations on 24-hr fcst error norm Reduction Increase

  8. Data Assimilation Issues for Lidar Observations • Procedures for super-obbing or thinning of raw data • Quality control – innovation checks • Specification of observation and representativeness error

  9. Potential Benefits of Space-Based Lidar Observations • Will observations fill gaps in current observing network (esp. 500-800 mb layer?) • Will observations be in forecast error source regions? • More accurate than other wind observations? • How much data will be provided, and how frequently ?

  10. Current GEOSAT Wind Coverage 500 – 700 mb 300 – 500 mb 700 – 800 mb 800 – 900 mb Impact of JMA – MTSAT wind observations

  11. Error Source Regions – Sensitivity to Initial Conditions January 2007 – 0000 and 1200UTC Analyses NOGAPS - NAVDAS

  12. Observations in the North Pacific Region 60N 130W 140E North Pacific Ocean 20N

  13. North Pacificregion observationdata count - NAVDAS 04 Feb 2007 (00,06,12,18UTC) Total = 97,183 obs = 6.7% of global data Ob Data Count

  14. North Pacific Region Observation Variable Count - NAVDAS 04 Feb 2007 (00,06,12,18UTC) Ob Data Count

  15. North Pacific observationimpact sum - NAVDAS Change in 24h moist total energy error norm (J kg-1) 1-31 Jan 2007 (00UTC analyses) Error Reduction

  16. North Pacific forecast error reductionper-observation Change in 24h moist total energy error norm (J kg-1) 1-31 Jan 2007 (00UTC analyses) Error Reduction (x 1.0e5) Ship Obs Targeted dropsondes = high-impact per- ob, low total impact

  17. End of Presentation !

  18. Global observationdensity - NAVDAS 04 Feb 2007 (00,06,12,18UTC) Excluding Aircraft & Satwind Observations All Observations Excluding Aircraft Observations Than over land More satellite data over ocean Number of data in 5deg x 5deg lat-lon areas

More Related