TM5 4DVAR meeting4-9-2014

Agenda

• TM5 4DVAR Main branch

• Priorities LOT3

• TM5 mp

• New feature wish list

• Meeting format etc.

Main branch

• Where? [SF ..?]

• Who maintains it?

• What should it contain?

• How to organize updates?

4D-var Tree

default sourishmultitracer

sanderCH4 project

“cy1”

JRC version

SourceForge versions

• current versions considered in “merge” project

defaultmulti tracer

sourishmulti tracer

sanderCH4 project

“cy1”

JRC version

SourceForge versions

defaultmulti tracerCH4 project

defaultmulti tracerCH4 projectJRC features

Merging procedure

• Compare codes, identify differences• Difference found ?

– Add to discussion page on SourceForge Wiki (t.b.d.)– If difference does not alter result:

• Make one version the new standard

– If difference does alter result:• Initially keep both alive, add temporary flag to rcfile• After discussion decide if:

– both stay supported, with new flag in rcfile– one version becomes new standard, other is removed

Benchmark tests

• Two benchmark test:

PyShell test JRC testProvided by: Sander H. Peter B.Tracer(s) CH4 CH4Optim Emissions

Bias parameters ?EmissionsInitial concentrations

Observations PointGOSAT “PROXY”

Point

Time period 2 months 14 months

• While testing, the merge versions should reproduce both benchmarks exactly.

F.U.Q. - Frequently Unanswered Questions• Why is the PyShell code inside TM5 ?

base/branches/var4d-mt/src/ bin/ rc/ optimizer/ py/ f2py/scripts/rc/

TM5/base/branches/whatever/src/ bin/ rc/PyShell/base/branches/var4d-mt/optimizer/ py/ f2py/ scripts/ rc/

Alternative:

+ better separation of model versions+ split in 4D-var settings and model related settings

F.U.Q. - Frequently Unanswered Questions (2)• Is TIPP still used ?

– Put it on SourceForge in a ‘tools’ directory ?(also put ‘vpp’ in there?)

• Are emission time profiles still used? (for example for fire emissions at daily resolution)Now categories could have different time resolutions already.

Wish list (long term)• bias parameter optimization

– satellite data:-> JRC approach will be done within framework project-> SRON approach part of “sander” branch?

– point observations (N2O) : t.b.d.

• Rodenbeck scheme (for coupling regional models)• Monte Carlo approach for uncertainty estimates• log-normal p.d.f.’s for uncertainty in parameters• …

TM5mp & 4DVAR

• Motivation: Modern computers & 4DVAR

• Allow higher resolution simulations, more years, more tracers, etc.

• Draw back: No zoom

• But PyShell facilitates switching between model versions

Next …

• Do we agree that TM5mp 4DVAR has high priority?

• If so, how to organize this.

New feature wish list 1

• GM: Simplify RunTM5.py• GM: Get rid of the shared pool of rc-keys.• GM: ‘simple’ rather than ‘fancy’ python

coding.• GM: Simplify the code tree (e.g. get rid of

branches in the main branch).• GM: Document Python classes and methods.• GM: Get rid of the logging module.

• SB: Read one day of meteo at once• SB: Fix phlb_t in the adjoint• SB: Implement Chevalliers 4DVAR time

splitting• SB: Let VPP calculate the AK• SB: Fix problem with adjoint and zoom• SB: 3 hourly meteo in 4DVAR

New feature wish list 2

• Look for volunteers.

• Pay Arjo?

• We could use these meetings to evaluate progress and prioritize tasks.

How to deal with the ‘new feature wish lists’

• Frequency

• Size

• Telecon tool

• Archiving / Minutes

• Else?

About these meetings