Processing the land cover for the CMIP7 Scenarios (high and low):
Progress has been made and code is being cleaned up for compatible python functions that can be applied to both the historical and scenario input data.
ESM1.6 1pctCO2, 1pctCO2-bgc and 1pctCO2-rad runs are done:
Results show reduced land climate (gamma_L) and co2 (beta_L) feedback parameters compared to ESM1.5. Compared to the CMIP6 ensemble, ESM1.5 was already low so ESM1.6 may be even lower again. Not inherently a bad result but will need to have a dig around to understand why we’re lower than ESM1.5.
Check regional patterns, initial conditions, climate drivers (perhaps an effect of lower mean global temperature in picontrol or changes in precipitation patterns over SAmerica).
Concentration-driven historical run is going but not with formal ACCESS-NRI configuration release. Still awaiting that configuration to be finalised and will need to re-run.
Need to have the concentration-driven run finished (up to 1979) to get AMIP runs going too
CMIP7 LUMIP
Offline land model simulations with and without land-use change. Includes land-hist and land-amip.
Are we committed to contributing to this MIP? It is not a deliverable under any existing project and has always been left as a question mark as part of NESP.
Important to contribute to this LUMIP to position ourselves as land modeling experts in ACCESS and better position ourselves as the team leading land modeling across projects (TRENDY, CMIP).
Largely follows the TRENDY protocol but uses the same land model versions as those in the coupled models i.e. equivalent CABLE science as used in ACCESS-ESM1.6. This means .
Would require a few things in collaboration with ACCESS-NRI:
Requires running CABLE and ACCESS resolution
Regridding TRENDY forcing to ACCESS grid
Probalby need to choose an appropriate weather generator to convert daily TRENDY forcing into sub-daily forcing for CABLE. Consult with Juergen on this.
Set up gridinfo file properly with initial conditions
Ian flagged: We don’t have currently have capability to do land-use change (including thinning) in the offline CABLE model. Getting the same code into CASA should be straightforward but the I/O will be tricky, including MPI. Will need discussion with NRI team (Claire, Lachlan, others) on how to do this.
ESM1.6 pre-publication QC (led by Christine)
ACCESS-ESM1.6 Carbon Cycle Evaluation:
Land, ocean, atmosphere
Key metrics to look at?
ACCESS-NRI Land and Coupled Modelling Workshop – Abstracts due tomorrow
Fire in CABLE:
Ian has been working on getting BLAZE working without POP in a CABLE development branch. Implementing it into ACCESS would require bunch of extra work including new state variables, updating the restart, working through the large number of differences across CABLE branches between this dev branch and the ACCESS-ESM1.6 branch.
Discussed experimental design that will make use of ACCESS-ESM1.6 CMIP7 configs.
New piControl spinup required with new land cover map that includes all necessary tiles to be initialised, this includes necessary tiles for (i) NVIS+LUH3 version of Australian land cover, and (ii) Global ESM1.5+LUH3 version of Australian land cover (same processing used as global land cover in ESM1.6; no NVIS data incorporated).
This new spinup will allow us to branch off different historical (and subsequent AMIP) experiments to evaluate the impact of (i) updating the land cover distribution (no change in tree types/parameterisations i.e. PFTs 2 and 4 are in place of any new PFTs 12 and 13, respectively), and (ii) updating tree PFTs to include Australian PFTs 12 and 13 (where NVIS tells us to) which includes new parameterization and AusTraits data.
ESM1.6 Carbon Cycle Evaluation (Alex):
Results against the GCB show that ESM1.6 has largely improved across the board relative to ESM1.5
Further evaluation is needed. (i) Account for uncertainty and variability in the benchmarking data, (ii) look at evaluating the seasonal cycle of atmospheric CO2.
Action items:
Alex: Generate new land cover map for spinup of Australian experiment.
Alex has already documented three planned publications: (1) Land model description for ACCESS-ESM1.6, (2) New Australian vegetation for ACCESS-ESM1.6, (3) Global carbon cycle evaluation (land+ocean+atmosphere).
ACCESS-ESM1.6 Land Cover for Scenarios:
First draft of H-Scenario land cover is available: /g/data/p66/ajn563/ACCESS-ESM/ESM1.6/luh3-1-1/scenarios/H-Scenario/ACCESS_vegfrac_scen_h.nc. This includes combination of Australian NVIS vegetation (with Aus PFTs) and global processing.
There are new tiles that appear in the scenarios that we never initialised in the spinup or historical period. What to do about these?
If we’re adding new crop and there’s existing grass in that grid cell, take fields (e.g. temperature, moisture, albedo, lai, etc) from the grass and assign them to the crop.
Consensus is that introducing new tiles during a scenario (in 2022) that were never initialised in the spinup or historical runs should be okay, so long as the required fields are given physically plausible values in the restart at the beginning of the run. This would require running Lachlan’s restart ancillary generation script to fill these tiles with grid cell or searched values (we can specify what rules to use) once to the restart before running to the scenario.
Rachel will test this out.
There is one problematic erroneous grid cell that was accidentally assigned 100% DBL in the historical.
(Claire) CABLE4 technical discussion:
Scoping and planning around fire in ACCESS:
Need a plan for this going forward. What are the priorities? What are user needs? What is ACCESS-NRI’s strategy around model support?
We should allocate some time as a group (CSIRO+others) to discuss if/when/how to bring fire into ACCESS.
E.g. which ACCESS model version to bring it into? What would be the applications and purpose going forward? What technical requirements would we need to consider such as integration with UM? How much back-porting would be required to get fire into ACCESS-ESM1.6 and the ESM version of CABLE3? OR should we just forge onto a CABLE4 and ACCESS-ESM1.6.
Who should be involved: Ian, Tilo, Rachel, Alex, Jhan, NRI folks
Action items:
Rachel to test scenario runs with new land cover and see what happens on new tiles.
Alex to generate land cover for VL-scenario to see if we get new tree PFT tiles appearing as well.