1 / 25

NWC SAF/High Resolution Winds Product

This document presents the validation, use, and plans for the High Resolution Winds v2013 (HRW) product by NWC SAF. It discusses the main changes introduced in the v2013 version, including trajectory calculation and quality control updates. The document also highlights the requirements for future versions of HRW and provides information on the validation of HRW against radiosonde winds and other algorithms.

hardyb
Download Presentation

NWC SAF/High Resolution Winds Product

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. NWC SAF/High Resolution Winds Product 25th February 2015 2015 NWC SAF Users’ Workshop Madrid, Spain Javier García-Pereda (jgarciap@aemet.es)

  2. Index I. High Resolution Winds v2013 - Validation of High Resolution Winds v2013. - Use of High Resolution Winds v2013. II. Plans for High Resolution Winds v2016 - Inclusion of Cloud Microphysics. - Adaptation to GOES-N satellite series. III. Requirements for High Resolution Winds later versions

  3. High Resolution Winds v2013 High Resolution Winds (HRW) is the NWC SAF Product providing High density sets of Atmospheric Motion Vectors (AMVs) for near real time applications considering up to 7 MSG/SEVIRI channels (HRVIS, VIS06, VIS08, IR108, IR120, WV062, WV073) Latest HRW version (v4.0, v2013) released in August 2013. Example of HRW v2013 AMV outputs for 9 June 2014 at 1545Z

  4. High Resolution Winds v2013 • Main changes introduced in HRW v2013: • 1. Calculation of trajectories through • the continuous tracking of the same tracer in consecutive slots • (AMV and Trajectory output provided as two different/specific BUFR files). Example of HRW v2013 One hour and Three hour Trajectory outputs for 09 June 2014 at 1545Z 4

  5. High Resolution Winds v2013 • Main changes introduced in HRW v2013: • 2. Update of the Quality Control process, • to version currently implemented at EUMETSAT/MPEF AMV Quality Control • (including a Quality index without use of forecast contribution). Quality index with forecast contribution 26 December 2009, 1200Z QI ≥ 70% QI ≥ 74% QI ≥ 78% QI ≥ 82% QI ≥ 86% QI ≥ 90% QI ≥ 94% QI ≥ 98% Quality index without forecast contribution 26 December 2009, 1200Z

  6. High Resolution Winds v2013 Main changes introduced in HRW v2013: 3. Default calculation of AMVs without use of NWP wind guess in the tracking process, through additional code optimizations, so reducing the dependence from NWP data. 4. Option to provide HRW AMV BUFR output in a format exactly similar to the one for EUMETSAT/MPEF AMVs easing its use for NWP model assimilation. 5.Formal review and recommenting of all HRW code for its clearer understanding by anyone who wants to read and use the code. 6

  7. Comparing Validation statistics against Radiosonde winds for the default configuration of HRW v4.0 (v2013) respect to previous ones (Jul 2009-Jun 2010, Europe & Mediterranean region, “Basic scale AMVs”): Validation of HRW v2013 > There are reductions in the mean NMVD/NRMSVD with very significant increases in the amount of AMV data [x 5 !!].

  8. Validation of HRW v2013 The Validation for HRW v2013 has also verified: • The good validation of “Detailed scale AMVs”, with a smaller tracer size of 12x12 pixels and even better validation statistics (smaller NMVD, NRMSVD): • The possibility to use all AMVs with QI ≥ 1%, with mean NRMSVD ≤ 0.50: 8

  9. Validation of HRW v2013: NWP SAF NWC SAF/HRW AMVs included since 2013 in the NWP SAF AMV Monitoring: http://nwpsaf.eu/monitoring/amv/14_12/density_ukv.html http://nwpsaf.eu/monitoring/amv/14_12/map_ukv.html It is a monthly updated Verification of NWC SAF/HRW AMVs around the British Isles, in comparison with Eumetsat AMVs, including: - Speed scatterplots. - Spatial distribution of validation parameters. 9

  10. Validation of HRW v2013: NWP SAF The comparison of NWC SAF with Eumetsat/MPEF AMVs shows: - The very high density of HRW data (1-2 orders of magnitude larger). - Similar, often better, validation parameters (specially since Mar.2014, with +40 hPa for NWC SAF AMVs at High levels) * More info: “Results of the AMV assimilation at the Met Office”, by Crispian Batstone et al. on Wednesday 10

  11. Validation of HRW v2013:Intercomparison study NWC SAF/HRW AMVs have also been included in the 2014 AMV intercomparison study by CIMSS/University of Wisconsin. The study compared operational AMVs from next institutions: - BRZ: Brazil Weather Forecast and Climatic Studies Center (CPTEC/INPE) - CMA: China Meteorological Administration (CMA) - EUM: EUMETSAT - JMA: Japan Meteorological Agency (JMA) - KMA: Korea Meteorological Administration (KMA) - NOA: National Oceanic and Atmospheric Administration (NOAA) - NWC: NWC SAF 11

  12. Validation of HRW v2013:Intercomparison study NWC SAF/HRW and EUMETSAT/MPEF AMVs stand out against the other algorithms because of their use of “CCC height assignment method”. NWC SAF/HRW AMVs show often the best validation statistics (against both Radiosonde winds and NWP winds): > Pressure rms. > Speed rms. > Vector rms. Verification of AMV algorithms against Radiosonde (up) and NWP winds (down) in Exp. 4. (17 Sep 2012 1215Z, operational height assignment). 12

  13. Validation of HRW v2013:Intercomparison study The key might be the extensive but exigent search of tracers by NWC SAF/HRW algorithm: > Under similar conditions than the other AMV algorithms, a smaller amount of HRW AMVs but with very good statistics is calculated. > Under operational configuration, a very large amount of HRW AMVs also with good statistics is calculated. BRZ CMA KMA NOA EUM JMA NWC NWC (pres (opera cribed) tional) ** More info: “2014 AMV Intercomparison Study” by David Santek et al., http://www.nwcsaf.org/HD/files/vsadoc/AMV_Intercomp_Extended_Abstract_v3.pdf 13

  14. Use of HRW v2013 WMO’s Coordinated Group on Meteorological Satellites (CGMS) has formally recognized in its 40th Meeting Report (Lugano, 2012):  “NWC SAF/HRW software fulfills requirements to be a portable standalone AMV calculation software due to its easy installation and usability”  “A continuous exchange of information about usability and improvements of the software exists through the NWC SAF Helpdesk”  “Alternatives exist as portable standalone AMV calculation software, but they are not as advanced in terms of documentation and do not have an existing Helpdesk”  “Appreciation is expressed to the NWC SAF for preparing HRW software, for helping overcome obstacles in the use of AMVs by both operational and research users, and for its contribution to the harmonisation of AMV products” 14

  15. Use of HRW v2013 WMO’s Coordinated Group on Meteorological Satellites (CGMS) has formally recognized in its 40th Meeting Report (Lugano, 2012):  The software has been successfully adapted by some CGMS members (Japan Meteorological Agency, Korea Meteorological Administration).  These member express in the Report that NWC SAF/HRW is: - An important tool for development. - Modular, well documented, well suited as “standalone AMV software”. 15

  16. Use of HRW v2013 Some examples of use of AMVs are going to be presented at this Workshop: 1. The MetOffice has started to include HRW AMVs in its operational Unified Model NWP data assimilation (British Isles Region, 1.5 km resolution). > Since February 2014: 100-400 hPa HRW AMVs. > Since June 2014: also 400-900 hPa HRW AMVs over sea.  “Results of the AMV assimilation at the Met Office”, by Crispian Batstone et al. 2. Other Meteorological services are also testing the use of HRW AMVs: > In NWP data assimilation:  “The use of the High Resolution Winds in the AROME mesoscale model at the Hungarian Meteorological Service” by M.Putsay et al. > As AMV algorithm with other Geostationary satellites (like COMS in Korea):  “NWC SAF Products in NMSC/KMA” by E. Sohn > Inside other Forecasting/Nowcasting tools:  “Using NWC SAF Products in the Weather Forecasting Process at DWD” by J. Asmus  “NWC SAF/EXIM product” by A. Jann  “NWC SAF/Convection products” by J.M. Moisselin 16

  17. Next version (HRW v2016) will have next improvements: 1. Modification of the AMV height assignment with NWCSAF/Cloud Microphysics products. 2. Adaptation of HRW algorithm to GOES-N satellite series. Plans for HRW v2016

  18. Plans for HRW v2016: Inclusion of Microphysics Modification of the AMV height assignment with NWCSAF/Cloud Microphysics: Several studies (P.Lean et al., Á.Hernández-Carrascal, K.Salonen & N.Bormann, 2014) suggest to consider AMVs at a level lower than the cloud top. A relationship has been found to exist between the “AMV best fit pressure level” and the NWCSAF/Cloud Microphysics, considering next steps: 1. “AMV Cloud phase”, “AMV Liquid water path” for liquid AMVs (LWPAMV), “AMV Ice water path” for Ice AMVs (IWPAMV) are calculated considering pixel information provided by NWCSAF/Cloud Microphysics products (available during daytime!) and formulas provided by “CCC height assignment method”. 18

  19. Plans for HRW v2016: Inclusion of Microphysics 2. Displaying for “Ice phase AMVs”/“Liquid phase AMVs” the Relationship between IWPAMV/LWPAMV and the Pressure difference with the Radiosonde best fit level: > AMV best fit level lower than Cloud top (Negative values of Press.Diff.) > Linear increase with IWPAMV /LWPAMVof Press.Diff. with the best fit level (CorrIce – IR/WV ch. ~ 0.98!), up to a max. IWPAMV, over which it becomes constant. 19

  20. Plans for HRW v2016: Inclusion of Microphysics 3. Defining a correction of the AMV pressure level with the relationship Pressure difference with the best fit level(IWPAMV/LWPAMV) Before: After: > Improvement in all parameters (Number of AMVs, NBIAS, NMVD, NRMSVD).  Already implemented in the software code! Could be even released as a patch for HRW v2013 now! 20

  21. Plans for HRW v2016: Adaptation to GOES-N Adaptation of HRW algorithm to GOES-N satellite series (GOES 13, 14, 15): > This process will prove how well NWC SAF software, and specifically NWC SAF/HRW algorithm, can work with other Geostationary satellites. > This process is an initial step for adaptation to other Geostationary satellite series later on. > AMVs will be extracted from: - 0.6 μm High resolution visible channel (1 km resolution) - 10.7 μm Infrared channel (4 km resolution) - 6.5 μm Water vapour channel (4 km resolution)  Now in phase of development. 21

  22. Requirements for HRW later versions Some recommendations have already been received for HRW algorithm during CDOP-3 (2017-2022) From the Coordinated Group on Meteorological Satellites (CGMS): 1. HRW should expand its algorithm to other satellites.  Specific plans exist for (together with the rest of NWC SAF products): - Adaptation to Himawari 8/9 series (~ v2017). - Adaptation to GOES-R and MTG Imager series (~ v2020). 2. HRW should integrate improvements suggested/developed by external users. “NWC SAF Visiting Scientist Activities” give the chance to finance and integrate AMV procedures in HRW algorithm, in parallel to those developed by the NWC SAF team. 22

  23. Requirements for HRW later versions From the 11th and 12th International Winds Workshop (2012, 2014): 1. Collaboration/share of software code with other AMV producers encouraged to compare methods/algorithms. 2. Investigation of “Nested tracking” technique. “Stereo height assignment” technique. “Mesoscale Quality indicators”. Provision of additional “Speed and height error estimates”. “Best fit height respect to NWP model” for AMV analysis. 3. Research on AMV retrieval and AMV profiles with hyperspectral data (like MTG Sounder Radiances or T/q profiles)  MTG Sounder only available in 2021 or later.  The need to extract first corresponding Radiances or T/q profiles, suggests that this could only be operative in CDOP-4. 23

  24. Requirements for HRW later versions From NWC SAF Users Survey (AMVs needed by ~70% of answers!): 1. Option to process other Cloud products for AMV height assignment (like EUMETSAT/MPEF OCA product). 2. Increasing of temporal/spatial density of AMVs, specially at low levels (In line with the use of new satellites series like MTG Imager):  More evaluation of smaller tracer sizes/temporal gaps.  “Mixed method” between Nominal and Rapid scan, with AMVs calculated in Nominal scan cycles, with Tracking verification considering Rapid scan cycles. 3. Extension to additional Geostationary satellites  Not foreseen: 5 geostationary series already in initial plan for CDOP-3!  Maybe through NWC SAF User collaborations and VSAs? 24

  25. Many options have been defined for HRW algorithm in CDOP-3, and many more are expected during this “Users’ Workshop”. Please help us to define what you might need, and what might be most important for your use of HRW algorithm! For any need or help, do not hesitate to contact me:  through email (jgarciap@aemet.es)  or at any moment during this “Users’ Workshop”. Thank you very much for coming! Javier García-Pereda Requirements for HRW later versions 25

More Related