Recent work using Satellite winds at the Deutscher Wetterdienst (DWD)

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Presentation transcript:

Recent work using Satellite winds at the Deutscher Wetterdienst (DWD) Alexander Cress Deutscher Wetterdienst, Frankfurter Strasse 135, 63067 Offenbach am Main, Germany alexander.cress@dwd.de Introduction Recent changes in satellite wind usage New projects (HR AMVs / NWPSAF – DWD cooperation) Use of scatterometer data Aeolus plans Summary 14th Internat. Wind Workshop Alexander Cress

The deterministic NWP-System of DWD Global-Modell ICON grid size: 13 km vertical levels: 90 Grid area: 173 km2 Hybrid DA 13km VarEnKF Flow dependent B: BVarEnKF = αBLETKF + (α-1)B3DVAR Incremental analysis update SST, SMA and snow ana ICON-EU Nest over Europe grid size: 6.5 km Vertical levels: 60 forecasts: Grid area: 43 km2 COSMO-DE (convection resolving) grid size: 2.8 km vertical levels: 50 forecasts: 3-hourly Girid area: 8 km2 Det LETKF replaced nudging 14th Intern. Wind Workshop 2018 Alexander Cress

The probabilistic NWP-System of DWD ICON-EPS; M40 grid size: 40 km vertical levels: 90 grid area: 1638 km2 Ensemble DA 40 member 40km LETKF. Horizontal localization radius 300km. Relaxation to prior perturbations ( 0.75). Adaptive inflation (0.9 - 1.5). SST perturbations Soil moisture perturbations (experimental) ICON-EU Nest over Europe grid size: 20 km vertical levels: 60 forecasts: grid area: 407 km2 COSMO-DE-EPS; M20 grid size: 2.8 km vertical levels: 50 Forecasts: 3-hourly grid area: 8 km2 Ensemble DA 40 member 2.8 km LETKF SST pertubations Soil moisture pertubations 14th Intern. Wind Workshop 2018 Alexander Cress

Data coverage Operationel Geo: GOES 15/16 Metop 8/11 Himarawi-8 Polar: AVHRR from Metop 3 / 4 single and dual the NOAA series MODIS from Terra and Aqua

Changes in operationel usage of satellite winds since the last meeting Use of Dual Metop AMV winds Replacing Meteosat 10 by Meteosat 11 winds Filling the gap over eastern America by GOES 16 winds ScatSat ocean winds in parallel routine 14th Intern. Wind Workshop 2018 Alexander Cress

all AMVs except dual Metop data AMV Obs minus FG statistics Crtl plus dual Metop – Crtl all AMVs except dual Metop data Positive impact using the other AMVs on both hemispheres Slightly more AMV data active 14th Intern. Wind Workshop 2018 Alexander Cress

Forecast Scores Wind 300 hPa Crtl Crtl + Dual Metop Positive impact using Dual Metop on both hemispheres Larger on the Southern Hemisphere in higher troposphere 14th Intern. Wind Workshop 2018 Alexander Cress

Obs –FG statistics Comparison Meteosat 10 / Meteosat 11 Meteosat 10 global Meteosat 11 Bias 1.69 0.93 3,76 0.86 2.17 1.16 4.15 1.00 Std 6.37 4.08 9.03 3.86 6.72 4.13 9.15 3.83

Obs –FG statistics Comparison GOES 16 / GOES 15 GOES 16 global GOES 15 Bias 0.24 0.23 0.19 0.26 Std 4.85 3.44 3.96 3.56 14th Intern. Wind Workshop 2018 Alexander Cress

Crtl (ohne GOES 16 und Meteosat11) Exp: Mit Goes16 und Meteosat 11 AMVs

Use of high resolution AMV winds derived by NWC SAF Run the NWC SAF software to derive high resolution AMV Winds in house Software: NWC SAF Software v2013. The new version (v2016) runs in test modus The available patches are incoparated (Katja Hungersdörfer) Area: EUROPA B (defined in house)   Output: AMVs in EUMETSAT Bufr format # Wind guess use flag WIND_GUESS 0 ; no use of model winds DWD regional model system (COSMO/KENDA) is able to use HR AMVs similar to global system First monitoring experiment started 14th Intern. Wind Workshop 2018 Alexander Cress

Use of high resolution AMV winds derived by NWC SAF HR AMV monitoring started in Jan 2018 First results lock promising A lot of wind obs. in competition with AMVs in Kenda area (radisonde, aircraft, MODE-S, radial winds) Not easy to show impact Long experiments needed => expensive Evaluation software has to be adapted IR VIS WV BIAS -2.00 -0.63 -0.47 -0.16 -1.21 -0.08 RMS 4.96 3.45 3.28 2.98 5.01 3.94 STD 4.54 3.39 3.25 2.97 4.98 3.93 14th Intern. Wind Workshop 2018 Alexander Cress

NWP SAF – DWD cooperation AMV monitoring

NWP SAF – DWD cooperation AMV-Calipso lidar height monitoring

Use of scatterometer data Operationel use of ASCAT onboard Metop 3/4 Pre-operationel use of ScatSat Operational use of Altimeter data (Janson 2/3, SARAL) Wind speed bias correction of Scatterometer/Altimeter data Relative difference of obs – fg rms between exp. with and without ScatSAT data for ASCAT observations mean: 98.64 %

Aeolus Wind Lidar work Aeolus will be launched in 2018 Observation will be HLOS Level 2B Cal/Val rehearsal dataset provided by ECMWF The data has been regenerated (in March 2018) with the most recent processing chain: E2S v4.01, L1B v7.01 and L2B v3.00. Data are provided in Bufr Format Bufr reading is finished Observation operator implemented One day data assimilation with test data conducted Looking forward on the real data 14th Intern. Wind Workshop 2018 Alexander Cress

Summary Dual Metop data show postive impact for differnt seasons AMVs operational since summer 2017 Quality of Meteosat 11 AMVs comparable to Meteosat 10 operational since March 2018 Qulaity of GOES 16 AMVs slightly better than GEOS 13, show potive impact operational since April 2018 HR AMVs production - derived from NowCasting SAF software – successfully implemented and first monitoring experiments started NWPSAF-DWD cooperation started => monitoring of Lidar-AMV heights ScatSat winds in data assimilation system tested => operational this summer Aeolus Wind Lidar test data in DA integrated 14th Intern. Wind Workshop 2018 Alexander Cress

Thank you for your attention! Questions? APSDEU-12/NAEDEX-24 Data Exchange Meeting Alexander Cress