Minutes of the code management group meeting 16/09/2014

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UKCA Code Management Meeting, 16 Sep 2014 (tele-conference)

Participants:
Met Office: Nick Savage (NS), Mohit Dalvi (MD), Colin Johnson(CJ), Fiona O'Connor (FC), Jane Mulcahy (JM)
Leeds: Graham Mann (GM)

Apologies: Cambridge: Luke Abraham (LA), Alex Archibald (AA)
Oxford: Zak Kipling (ZK)
Leeds: Sandip Dhomse (SD)

Actions from this Meeting

  • NS to circulate to all the method to access ukca_bugs emails through Outlook.
  • ALL. Communicate any foreseen UKCA improvements to FOC before next Code Mgmt meeting
  • JM to check whether settings, branches in vn8.4 Release candidate are consistent with GA6/7 assessment job and also attempt tuning of SO2 scavenging parameters.
  • NS/LA. Add standing agenda item on Bug Reporting.
  • NS to email Nicolas B. regarding participation in CMG meetings/ process.
  • NS. Create doodle poll for next meeting

Actions Carried forward from Last Meeting

  • CJ to circulate plots of radical concentrations in stratosphere showing odd banded structure, including version with different photolysis scheme options. Ongoing.
  • CJ to email LA re problems with SO2 diagnostics for emissions. Issues related to using ASAD diagnostics package Ongoing
  • CJ to open ticket and start work on resolving inconsistencies in aerosol chemistry schemes. (unused tracers-CS2, missing chemistry in CHEST, above diagnostics) Ongoing
  • GM check 8.4 versus 7.3 GLOMAP-mode code and report any bug fixes to Mohit. Ongoing

Agenda Items

Status of release job

Details of Release Candidate are available at: Vn8.4_GA4.0_Release_Candidate:_xkawa
Based on the evaluation of results it was felt job is not yet fit-for-purpose with respect to aerosols/ AOD and some tunings related to EPS values and SO2 scavenging should be tried.
Status to be re-assessed at next CMG.

Bug Reporting

Strategy document on UKCA bugs management is available here.
Process to be followed involves user emailing ukca_bugs@metoffice.gov.uk with details; one of the recipients to populate the table and CMG to review status at each meeting.


Additional invitees

UM9.1 update

  • 9.1 will be released soon. NS to add UKCA specific release notes to the UKCA website (as for earlier releases). There are three key things to be aware of at this release.
    • The non transported prognostics are now controlled via option codes as for the tracers and so do not need STASH changes to turn them on
    • From this release there will be no more User STASHmaster files. Instead users will need to edit the STASHmaster_A in their branch (rose-meta/um-atmos/vn9.0/etc/stash/STASHmaster) and ensure that their suite installs this and uses it correctly.
    • Namelist reads also need some additional work as now only PE0 reads the namelists and broadcasts the names. This means some additional code is needed beyond just adding new items to the relevant names.

Priorities for future releases

Some ideas from the round table were:

  • 150+ tracers.
  • Ammonium nitrate
  • Dry deposition consistency between aerosols and gases
  • Dry deposition to cope with flexible land surface tiling
  • Solver improvements from JWCRP post
  • Nenes activation scheme
  • Plume scavenging of gas phase tracers
  • Any fixes for NOy problem
  • GLOMAP Aerosol coupled to Fast-JX
  • Improved heterogeneous chemistry in stratosphere (based on scheme used in troposphere)
  • Speciated CFC (depends on 150+ tracer updates)
  • Improved aerosol microphysics in stratosphere
  • improved BL ncuelation (organics)
  • modal dust

All to add to above list if necessary. Discuss and prioritise at next meeting.

Issues for UM project board

  • Testing. NS has already contributed. Any other thoughts on this to Luke.
  • Challenges of submitting code for use with Rose. CJ expressed concern that the additional work now needed when adding new code to the trunk will completely negate the benefits of having a shared repository. Devlopers will look at the long list of things they have to do and turn off. This will mean we do not get an increase in the number of developers outside the Met Office lodging code. We need to look for ways to streamline the process.

Date of next meeting

LA to set up doodle poll for next meeting in September. Not week of IGAC (22-26 September) or AEROCOM (September 29 to October 2).

AOB

  • CJ asked if he could add the new diagnostics associated with ammonium nitrate into STASH 38.101-200. This has been used in the past by strat-trop exchange diagnostics. Agreed that this is now dealt with by section 50.
  • CJ also thank NS for work as UKCA code owner.