====== About the ITWG DA/NWP Working Group ======

by [[:author:leannea|Leanne Avila]] — last modified May 07, 2021 08:01 AM

===== Working Group on Data Assimilation and Numerical Weather Prediction =====

Co-Chairs: [[mailto:fiona.smith@bom.gov.au|Fiona Smith]] (Bureau of Meteorology) and [[mailto:brett.candy@metoffice.gov.uk|Brett Candy]] (Met Office)

==== Aim and Scope ====

The aim of the Working Group on Data Assimilation and Numerical Weather Prediction is to increase the impact of satellite data in NWP. The group considers sounding instruments currently in orbit that build on the "TOVS heritage", such as ATOVS, SSMI/S, ATMS, AIRS, IASI and CrIS. The group achieves its goals by exchanging ideas and information on new techniques and progress and by providing a means of communication between NWP centres, satellite agencies and other groups engaged in work with satellite data.

The scope of the group includes global models and regional models as well as high resolution models. The group's recommendations and actions are to make satellite data and metadata easily available for NWP centres to use, to provide feedback to satellite agencies on any practical difficulties being experienced with the data and for NWP centres to share information and experiences on techniques and assumptions. Occasionally the group suggests new areas of work or advises NWP centres to change their data processing in a particular way. The most obvious example was in promoting the assimilation of radiances rather than sounding products.

==== Impact of Sounding data in NWP ====

Starting with ATOVS in 1999, the use of sounder data has become widespread with many NWP centres reporting strong positive impact, especially when directly assimilating the radiances.

Adjoint-based sensitivity studies have shown that the impact of satellite sounding data is far larger than for any other observation type within a variational analysis system. Observing system experiments (OSEs) also show that the impact of observations, particularly from ATOVS and IASI is comparable to or larger than that from radiosondes.

To find out more about the use of microwave and infrared sounder data, the ITSC proceedings are a vital source of information. Regular progress reports and reports on OSEs are provided by meteorological services. For results of OSEs including satellite data OSEs see link to the latest [[https://meetings.wmo.int/impact-workshop-7/SitePages/Presentations.aspx|WMO workshop]] on the subject (7th WMO Workshop on the Impact of Various Observing Systems on NWP , held virtually, 30th Nov - 3rd Dec 2020).

==== ITWG NWP Working Group Reports ====

The reports of the NWP Working Group from previous ITSC conferences are provided here in PDF format

  * {{:groups:itwg:nwp:wg_reports:itsc23_nwp_wg_report.pdf|ITSC-23, Online, June 2021}}
  * {{:groups:itwg:nwp:wg_reports:nwp_wg_2019.pdf|ITSC-22, Saint-Sauveur, November 2019}}
  * {{:groups:itwg:nwp:wg_reports:nwp_wg_report_itsc-21.pdf|ITSC-21, Darmstadt, Germany, November 2017}}
  * {{:groups:itwg:nwp:wg_reports:nwpwg_itsc20.pdf|ITSC-20, Lake Geneva, USA, October 2015}}
  * {{:groups:itwg:nwp:wg_reports:itsc19_nwp_wg_report.pdf|ITSC-19, Jeju, South Korea, March 2014}}
  * {{:groups:itwg:nwp:wg_reports:itsc18_nwp_wg_report.pdf|ITSC-18, Toulouse, France, October 2011}}
  * {{:groups:itwg:nwp:wg_reports:nwp_report_from_itsc-17.pdf|ITSC-17, Monterey, USA, April 2010}}
  * {{:groups:itwg:nwp:wg_reports:itsc16_nwp_wg_report.pdf|ITSC-XVI, Angra dos Reis, Brazil, May 2008}}
  * {{:groups:itwg:nwp:wg_reports:itsc15_nwp_wg_report.pdf|ITSC-XV, Maratea, Italy, October 2006}}

==== Interactions with other groups ====

This ITWG working group is a long standing sub-group of the Radiation Commission of the International Association of Meteorology and Atmospheric Sciences (IAMAS).

From time to time, the group also discusses relevant issues for radiative transfer models and radio frequency interference: these issues are fed back to the respective ITWG sub-groups that lead on these matters.

  * [[:groups:itwg:rtsp:start|Radiative transfer and surface property models]]
  * [[http://cimss.ssec.wisc.edu/itwg/groups/frequency/|Radio frequency interference]]

==== Useful Links ====

  * [[https://www.nwpsaf.eu/|The NWP SAF]]
  * [[http://www.jcsda.org/|The Joint Center for Satellite Data Assimilation]]

==== Monitoring and Data Quality Resources ====

  * [[https://www.nwpsaf.eu/site/monitoring/nrt-monitoring/|NWP SAF monitoring]] - includes links to many operational monitoring plots, not just SAF members
  * [[https://confluence.ecmwf.int/display/FCST/Observations+data+events|ECMWF record of observation issues]] - includes all types of satellite data

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