1. Ayrton Zadra and Keith Williams (WGNE co-chairs) WMAC5 25/04/16
WGNE activities
Ayrton Zadra and Keith Williams (WGNE co-chairs)
WMAC5 25/04/16

2. Working Group on Numerical Experimentation:
Jointly established by the WCRP and the WMO Commission for Atmospheric Sciences (CAS)
Responsibility of fostering the development of atmospheric circulation models for use in weather prediction and climate studies on all time scales and diagnosing and resolving shortcomings.
…aka building better models!
A distillation of the Terms of Reference…..
Advice, liaison
Co-ordinated experiments
Workshops, publications, meetings

3. Selection of current WGNE activities:
MJO-Task Force
Drag project – comparison on momentum budgets
Seamless working (AMIP & Transpose-AMIP methodologies)
Establishing importance of aerosols – level of complexity required across different timescales
Cloudy-radiance – comparing methods used in data assimilation
Grey-zone – joint project with GASS
Evaluation and verification
NWP performance (more variables - TC’s, precipitation)
Polar verification
Climate metrics
Issues with verification against own analysis

4. WGNE MJO Task Force (Steve Woolnough and Daehyun Kim)

9. WGNE Drag Project (Ayrton Zadra)
Main goal: compare the parametrized or physics component of this surface stress, i.e. the stress from parametrizations such as the planetary boundary layer (PBL) and the subgrid orographic (SGO) schemes.
Basic output requested: x- and y-components of the
parametrized stress, in units of N/m2, averaged over the 1st day (24h) of a month of forecasts. The months proposed were Jan and Jul 2012.

10. Comparison of averaged surface torque components – winter month

11. Comparison of averaged surface torque components – winter month

12. Comparison of averaged surface torque components – winter month

13. WGNE Drag Project Recent developments, ongoing and planned activities
Website and 1st report submitted to participants
Concept paper in preparation (to be submitted to BAMS)
Results presented at
21st Symposium on Boundary Layer and Turbulence (Jun 2014, Leeds, UK)
World Weather Open Science Conference (Aug 2014, Montreal, Canada)
Workshop on Angular Momentum Budget (April 2015 at Univ. Reading, organized by Dr. T. Shepherd)
Julio Bacmeister is project’s main contact with climate community
additional output for CMIP6 (for free atmosphere momentum balance, following TEM approach)
participated in Workshop on CMIP5 Model Analysis and Scientific Plans for CMIP6, Oct 2015, Dubrovnik, Croatia
ECWMF to organize a workshop on “Drag processes and their links to large-scale circulation”, in Sep 2016

14. WGNE/WGCM climate metrics and diagnostics panel (Peter Gleckler)

15. WGNE aims around verification and evaluation:
Encourage more interaction between the Climate Metrics and Diagnostics Panel and the Joint Working Group for Forecast Verification Research
Develop more seamless, comprehensive, process-orientated evaluation and verification methodologies across timescales (including seasonal!)
From a WGNE point of view, the main purpose of verification and evaluation is to indentify model deficiencies and possible causes with a view to fixing the model errors, rather than as a beauty contest.

16. WGNE future directions
Main aim to focus core activity of improving weather and climate models
Build stronger links with GASS and GLASS (concern over current lack of GASS chair(s)).
Continue to develop understanding on systematic model errors and work with GEWEX groups to address these.

17. Other short-term goals
Comparison of model momentum budgets
Consolidate results, engage with more participants, expand to climate (SPARC)
Importance of aerosols for weather and S2S
Expand cases, refine protocols, expand beyond NWP angle, etc. Links to EUMETCHEM
Support to S2S
Systematic error workshop, special focus on teleconnections
Support to PPP (PCPI)
Verification (quality of (re-)analyses), observational system design, etc.
Support to HIW
Support to CMIP
Particularly encourage NWP participation in HighResMIP (seamless agenda; counterpart of Tranpose-AMIP)

18. 5th WGNE Systematic Errors workshop
(probably) June 2017
Montreal Canada
The principal goal is to increase understanding of the nature and cause of errors in models used for weather and climate prediction.

19. Working Group on Numerical Experimentation:
Responsibility of fostering the development of atmospheric circulation models for use in weather prediction and climate studies on all time scales and diagnosing and resolving shortcomings.
Where does coupled NWP live?
Should “atmospheric circulation” be removed from above?

20. Thank you