1 / 16

Deutscher Wetterdienst status report

17th North America-Europe Data Exchange Meeting 28-28 May 2004, Montreal. Deutscher Wetterdienst status report. Reinhold Hess. Montreal 2004. Deutscher Wetterdienst status report. Overview: Main Events in NWP since the last report Pseudo Temps Data Usage 1D-Var for ATOVS

ahava
Download Presentation

Deutscher Wetterdienst status report

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. 17th North America-Europe Data Exchange Meeting 28-28 May 2004, Montreal Deutscher Wetterdienst status report Reinhold Hess Montreal 2004

  2. Deutscher Wetterdienst status report • Overview: • Main Events in NWP since the last report • Pseudo Temps • Data Usage • 1D-Var for ATOVS • Modis Polar Winds • SATOBS with QI • AIRS • Related Research at DWD • Résumé ReinholdHess, 2 Montreal 2004

  3. Main Events in NWP since the last report Model System: GME (Global Model): hydrostatic, icosahedral-hexagonal grid, mesh size ~60km terrain following hyb. coordinate, 31 layers forecast range: 174h initial dates 00, 12 UTC and 48h for 18 UTC new: prognostic cloud ice, prognostic sea ice Analysis: OI, 3-hourly intermittent analysis, observation window +/- 1.5h observations: conv., AIREP, AMDAR, ACARS, SATEM (NOAA 15, 16), SATOBS (GOES E and W, GMS, Meteosat 5 and 7), PAOB new: MODIS-Winds, PSEUDO-temps cutoff: 2h30 (for forecasts) ReinholdHess, 3 Montreal 2004

  4. Main Events in NWP since the last report Model System: LM (Local Model): non-hydrostatic, rotated latitude-longitude grid, mesh size 7km terrain following hyb. coordinate, 35 layers forecast range: 48 for initial dates 00, 12, 18 UTC new: prognostic cloud ice, prognostic rain Analysis: continuous nudging observations: conv., AIREP,AMDAR,ACARS cutoff: 2h30 variational soil moisture analysis ReinholdHess, 4 Montreal 2004

  5. Assimilation of IFS Pseudo Temps (operational since Dec 17 2003) Use Profiles of IFS/4D-Var Analyses as Temps for OI/GME Assimilation one time per day for 0 UTC into Main Analysis only Data Coverage ReinholdHess, 5 Montreal 2004

  6. Data Usage (ATOVS) Assimilation of 1D-Var Profiles in OI Status: Trial Experiments • Level 1c ATOVS from UKMO (NOAA 15, 16 and 17) • Channel Choice: AMSU-A 5-14 (HIRS deferred) • Bias-Correction: UKMO-Style (scan angle and mass, A4 and A9) • MW Rain/Ice-detection (Kelly and Bauer/ECMWF) • Assimilation as SATEMS in OI (geopotential thicknesses, PWC) ReinholdHess, 6 Montreal 2004

  7. Data Usage (ATOVS) Monitoring: • Time Series of observed and • simulated brightness • temperatures • Selection: • variable (also differences) • satellite • area • channel Routine Monitoring Auto-Alarm (email) ReinholdHess, 7 Montreal 2004

  8. Data Usage: ATOVS Trial Experiment 20040222-20040307 red: Routine with (Pseudo T.), green: Routine (without Pseudo T.) , blue: 1D-Var 0 UTC 12 UTC ANOC GEOP 500 hPa ReinholdHess, 8 Montreal 2004

  9. Data Usage: Modis Polar Winds • operational use of Modis Polar Winds (CIMMS Product) • usage only for assimilation run due to timeliness • comparison of NOAA/NESDIS and CIMMS Product under way 0 UTC 12 UTC ANOC GEOP 500 hPa ReinholdHess, 9 Montreal 2004

  10. Data Usage: SATOBS in BUFR with QI • comparison with conventional SATOBS • evaluation of QI as ECMWF • slight improvement for southern hemisphere • neutral for northern hemisphere • thinning from 60 to 200 km neutral • interest in pre-thinned data product ReinholdHess, 10 Montreal 2004

  11. Data Usage: AIRS Status: • Work has started to assimilate advanced infra-red sounders • Data Reception/Storage of AIRS-Data (thinned, 324 channels) • Monitoring (Global Coverage, “Tartan-Plots”) Plan: • Assimilate directly or as profile-product in 3D-Var in 2006 ReinholdHess, 11 Montreal 2004

  12. Related Research at DWD Development of PSAS (3D-VAR) (physical space assimilation system, dual space, observation space) Minimisation in Observation Space rather than Model Space • Conventional 3D-VAR (MSAS, Model Space Assimilation System) • solve: • PSAS (OSAS, Observation Space Assimilation System) • solve: • more flexibility in definition of B • observation space smaller than model space !?! • minimisation costs become quadratic in number of observations ReinholdHess, 12 Montreal 2004

  13. Assimilation of AIRS (IASI) Work Plan: • 12/2004 Technical Environment 1D-Var (Monitoring, Data Selection) • 12/2005 Experiments, Tuning, Cloud Detection, etc. • 12/2006 Assimilation with 1D-Var (OSAS/3D-Var) • (Interest in Products!!!) Related research at DWD: • Adaptive vertical Error Correlations for 1D-Var • Flexible Error Correlations for OSAS/3D-Var • Ensemble Kalman Filter ReinholdHess, 13 Montreal 2004

  14. Related Research at DWD Adaptive Vertical Error Correlations for 1D-Var (depending e.g. on vorticity) ReinholdHess, 14 Montreal 2004

  15. Status and Plans Résumé: • Operational Use of SATEMS, SATOBS, Modis-Winds (CIMMS) • Pre-Operational: ATOVS with 1D-Var and OI (substituting SATEMS) • Operational Interests in • BUFR-SATOBS • Modis-Winds (NOAA/NESID) • Quickscat Scatterometer • AIRS • Prototype of OSAS/3D-Var (direct Assimilation of ATOVS, AIRS) • but also Interest in AIRS/IASI-Retrievals ReinholdHess, 15 Montreal 2004

  16. Deutscher Wetterdienst status report Many thanks for your attention! ReinholdHess, 16 Montreal 2004

More Related