IWW recommendations

by Mary Forsythe — last modified Nov 25, 2015 07:21 AM

IWW12.1. Producers and users to discuss and agree provision of further information characterising the AMV derivation for enhanced QC and error characterisation (e.g. height error estimates from pixel-based cloud schemes, information on the correlation surface, contrast, etc).

IWW12.2. Satellite operators to consider coordination of orbits for scatterometer instruments and to provide open and timely access to data in order to maximise independent coverage and benefits to nowcasting and NWP from assimilation of scatterometer wind data

IWW12.3. All producers to consider during design of future derivation systems for next generation satellites the ability to handle existing and where possible earlier generations of satellites (with some expected code modularity to reflect the different channel availability etc). This will remove the need to maintain more than one system, ensure more consistent and improved approaches are applied to all operational satellites and will greatly simplify the approach to reprocessing.

IWW12.4. IWWG community to agree a new standard BUFR template, which when rolled out should be adopted by all producers. 

IWW12.5.  IWWG to consider the best approach to increase visibility of AMVs as a driver for design and operations of GEO through WIGOS etc (investigate the role of winds in the design and operation of future satellite constellations, as described primarily in the Manual on WIGOS and requirements for wind observations in WMO’s Observing Systems Capability Analysis and Review Tool (OSCAR)). 

IWW12.6.  Continue research into improved derivation and assimilation of high resolution winds for use in high resolution data assimilation and nowcasting.

IWW12.7. IWWG to undertake a 3rd AMV Intercomparison study in the 2018-2020 timeframe that will study the effect of using higher spatial, temporal, and spectral resolution imagery from the newest satellite series (Himawari 8/9 or GOES-R) on AMV derivation. The IWWG to coordinate with the ICWG in this study to gain an improved understanding of the cloud microphysics and its potential use for improving retrieved AMVs.  Apply a NWP SAF analysis type approach to the results and dig deeper into differences observed by the various satellite operators in order to understand why some algorithms perform better in some situations than others.

IWW12.8.  Recognise increased usage of pixel-based cloud products by AMV  derivation schemes and benefits of discussion between experts in both areas.  Attendance by ICWG Andrew Heidinger at IWW12 was very useful and recommend that this is repeated at future workshops with representative from IWWG also at ICWG meetings.

IWW12.9. MISR data to be made available in BUFR on the GTS (DONE). NWP  Centres encouraged to undertake further evaluation and share results via the  IWW NWP mailing list. Also to consider inclusion of monitoring online  (e.g. via NWP SAF). 

IWW12.10.  Recommend for future workshops to encourage those presenting posters to bring along A4 print outs and one slide to introduce their work.

IWW12.11.  Reprocessing of AMVs, and in particular funding of early GOES satellites and MODIS to be raised at joint CEOS-CGMS WG

IWW12.12. Encourage collaboration and sharing of software between producer centres to compare the methods and algorithm components. In particular AMV producers encouraged to provide a detailed description of their QI and  cloud height methods. The IWW website could accommodate this information.

IWW12.13.  All AMV producers to include a common QI using the same standard formulation. 

IWW12.14. To help prepare for GOES-R: NESDIS to make available an offline test dataset of SEVIRI AMVs processed with the GOES-R algorithm in ASCII, including all available meta-data (from nested tracking and with information on cloud parameters), covering several months within the past year (two seasons). NWP centres to assess and provide feedback.

IWW12.15. To use the intercomparison dataset and the collocated lidar/AMV dataset to investigate in greater detail height assignment issues, in particular in the tropical region. Collaboration with the cloud retrieval community is encouraged.

IWW12.16. Participants encouraged to discuss with climate colleagues the potential of AMVs for climate applications both as direct measurements and through assimilation in reanalyses. Consider also whether there is a requirement for production using a common algorithm. 

IWW12.17  Encourage continued support and collaboration between AMV producers and feedback from users to help improve the quality of AMV datasets, particularly with a view to securing long-term AMV provision over the Indian Ocean region.  

IWW11.1. All AMV producing centres are encouraged to investigate how to provide enhanced situation-dependent error estimates of wind and pressure with new derivation techniques.  NWP centres are encouraged to work with producers on the evaluation.

IWW11.2. A second AMV derivation intercomparison project should be carried out and the results presented at IWW12 in 2014.

IWW11.3. IWWG co-chairs to kick off an activity to pull together the latest research on high resolution wind production and usage and to encourage increased focus on this theme at IWW12.  This will involve input from NWP centres (to investigate need for this data in high resolution models and how best to assimilate) and data producers (how best to adapt the derivation).

IWW11.4. Satellite providers should investigate the potential of global AMVs from tandem satellites: dual Metop, MODIS/VIIRS and the future Sentinel 3A/B.

IWW11.5. The Canadian Space Agency is encouraged to realise the PCW mission, which will deliver unprecedented continous images in the Arctic region.

IWW11.6. Recommendation to the Chinese State Oceanic Administration and partner agencies to make global HY-2A scatterometer data available to the international community and investigate the possibility of real-time data dissemination.

IWW11.7. Recommendation to the US Navy to continue the processing of Level 2 Windsat data for use by NWP centres.

IWW11.8. NWP centres to provide information on radiosonde wind observation errors and, where relevant, typical observation errors for situation-dependent AMV error schemes on the NWP SAF AMV usage pages.

IWW11.9. The NWP SAF analysis reports should be made available three months before the corresponding International Winds Workshop.

IWW11.10. All AMV producing centres are encouraged to evaluate nested-tracking and report their results at IWW12.

IWW11.11. All AMV producing centres are encouraged to further evaluate height assignment techniques including investigation of stereo approaches and use of other datasets (A-train, Concorde-IASI, MISR) for intercomparisons.

IWW11.12. Satellite operators are recommended to maintain or include water vapour imaging capabilities on future polar orbiting satellites.

IWW11.13. JPL are recommended to provide MISR winds with improved timeliness (<5 hr). NWP centres are encouraged to evaluate MISR winds and to consider the reprocessed data for inclusion in reanalysis projects such as the ECMWF ERA-CLIM program.

IWW11.14. Satellite producers should continue research in the use of hyperspectral data for AMV retrievals.

IWW11.15. All AMV producing centres are encouraged to make use of model best-fit height comparisons for assessment of operational changes.  Ideally a standardised process for producing model best-fit pressures should be agreed.

IWW11.16. The NWC SAF are encouraged to propose a mechanism for providing wider support for their stand-alone AMV software package including how suggestions from external users are integrated into the package and flexibility to handle satellites other than Meteosat (addressed via CGMS-40 EUMETSAT-WP-11).

IWW11.17. All data producers are encouraged to provide any data for NWP centres in BUFR format.


IWW10.1. NWP centres to coordinate a joint AMV and scatterometer denial study (possibly two 6 week periods), also looking at adjoint sensitivity statistics where available.  Aim to summarise in a report to the WMO GOS impact workshop and IWW11, both due to be held in the first half of 2012.

IWW10.2. AMV producers to undertake a new AMV derivation inter-comparison using the latest software and a new study period.  Plan to repeat at intervals and report results at the IWWs.

IWW10.3. ECMWF, EUMETSAT, CIMSS and the Met Office to discuss options for a new simulation study. A key area to address is the association of errors with cloud type and evolution (testing the passive tracer assumption), although several other items could be investigated with this technique.

IWW10.4. Co-chairs to summarise the proposed approach to address the points raised in the plenary discussion on developing portable software (see CGMS-38 EUM-WP-42).  The NWC SAF, producers and co-chairs to undertake work to address the key actions.

IWW10.5. Co-chairs to set up a wiki page and initiate discussion on improving the derivation and assimilation of high resolution winds.

IWW10.6. Co-chairs to put together a summary of the recommended process for testing and implementing derivation changes to be attached to the IWWG web pages.  Producers and NWP centres to consider amending their strategy in-line with the agreed process.

IWW10.7. Encourage NESDIS to take part in AMV reprocessing efforts in support of reanalyses.

IWW10.8. Encourage all scatterometer data producers to consider providing global data in near-real-time to support NWP.

IWW10.9. Encourage reprocessing of scatterometer data in support of reanalyses.

IWW10.10. Height assignment is recognised as a major error source for conventional AMVs. IWW10 presentations highlighted the potential of the stereo-based height approach used for MISR winds.  We strongly encourage renewed efforts to evaluate MISR winds in NWP and support proposed initiatives to develop MISR follow-on (e.g. MISR-lite) which consider the timeliness and coverage requirements of NWP.

IWW10.11. Support and encourage efforts to develop hyperspectral wind products.

IWW10.12. Support the Canadian proposal for satellites in highly-elliptical orbit.

IWW10.13. Encourage increased efforts to validate AMV height assignment using the A-train, model, sonde, and profiler data.

IWW10.14. Encourage continued efforts to generate physically-based AMV vector and height error estimates to be sent with each wind.

IWW10.15. Encourage further development of the IWWG web pages, particularly to help with IWW10.4 and other collaborative projects.  Increase profile of pages by encouraging links to the site from elsewhere.

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