Duration: 2-4pm (CET) both days (second day optional or shorter if business completes on day one)

Attendees

ISSI team members: Stephen English (ECMWF), Catherine Prigent (CNRS), Ben Johnson (UCAR/JCSDA), Emmanuel Dinnat (NASA/GSFC), Jacqueline Boutin (CNRS), Stuart Newman (Met Office), Magdalena Anguelova (NRL), Thomas Meissner (RSS), Masahiro Kazumori (JMA), Fuzhong Weng ( LSW/CMA).

Invited Experts: Christophe Accadia (EUMETSAT), Mike Bettenhausen (NRL), Nic Nalli (NOAA), Yang Han (CMA/NSMC), Chunwen Wei (CMA/CAMS), Cristina Lupu (ECMWF), Marco Matricardi (ECMWF), Bill Bell (ECMWF), Mario Echeverri Bautista (KNMI).

Report

Agenda

1. Introduction (Steve and Catherine) 2pm-2.05pm

2. Review Actions from Meetings-1 (20-22 November) and 2 (30 April) 2.05pm-2.30pm

The actions from the first meeting were most closed, as recorded in the draft meeting-1 report from 20-22 November. Some additional action items arose from the second meeting. All are listed below.

• A1_1: All scientific papers to be shared amongst the group, as some are more difficult to obtain. These can be linked to from the ISSI web page.
• A1_7: Fuzhong Weng: The model will be compared to the model from Fuzhong Weng, who will also approach Ming Chen and Mark Liu to see if they wish to contribute to this effort.
• A1_8: Stu Newman: The two scale model will also be used to calculate IR emissivities and compared to Stu Newman’s results, to see how realistic this is.
• A2_1: Jacqueline Boutin’s model will be made available once the paper is published.

Note: Paper shared by JB 6/11

• A2_2: Maggie Anguelova: The formula for the revised foam model will be sent to the group.
• A2_3: Thomas Meissner: The Zhou data is not available yet. More lab measurements to be done, but not possible due to the shut-down. Question about the possibility to have dielectric measurements from Zhou at L-band for pure water. Share update in group at next meeting.
• A2_4: Lise Kilic: Some issues with the water vapor model and/or inputs at that stage in the comparison with GMI to be fixed.

In addition the points of guidance for the activity will be reviewed.

• A goal of the activity is not only to create a model, but also one with uncertainty estimated. Therefore in the code design we need to propagate uncertainty information from estimates of uncertainty in the model parameters.
• The group agreed that as this model aspires to be reference quality, it should not be tuned to a specific instrument, even one (e.g. GMI) that is considered to be of a higher reference quality.
• The model should also predict the wind direction component for the full Stokes vector. Windsat data and the existing RSS code can be used for validation. Mike Bettenhausen will investigate making the best quality reprocessed data available, but if not the real time data product is available e.g. archived at ECMWF.
• The group’s activities are on a best endeavours basis. The NWPSAF could be approached for resources (some limited resources have been made available from the Visiting Scientist budget of the NWPSAF). All group members will investigate possible sources of funding to allow more extensive activities.
• It was noted that if the code is submitted to the IEEE system it gets a DOI number. They provide tests and keep the code. However to update a new version must be submitted (and accepted) and another DOI allocated. So this is something to do only with mature code versions, and then with major updates in the future.
• The group discussed the issue of licencing of the code? Apache-2 open source license is a possibility. All group members to consider further to enable a clear decision on this when the code reaches the point for wider dissemination.

4. Summaries of progress

Presentations are anticipated as follows on each activity area:

1. 2.30pm-3pm Status of code (lead: Emmanuel Dinnat, Ben Johnson) and discussion
2. 3pm-3.30pm Dielectric Model Uncertainty (lead: Thomas Meissner)
3. 3.30pm-4.00pm Foam models (lead: Maggie Anguelova)
4. Close of 7/12
5. 2.00-2.20pm Comparisons update (Lise Kilic) (Lise Kilic)
6. 2.20-2.40pm Summary of L-band dielectric model (Jacqueline Boutin)
7. 2.40-3.00pm IR emissivity models (Nick Nalli NOAA)
8. 3.00-3.20pm Initial MW/IR model comparison (Stu Newman Met Office)

5. 3.20pm-3.50pm Agree tasks for next 6 months

6. 3.50-4.00pm AOB, discussion of plans for next meeting and close