Meeting Minutes 2024: Atmosphere Working Group

[heidi (Heidi Nettelbeck, ACCESS-NRI Atmosphere Modelling Team Lead)]

Notes from each meeting of the Atmosphere Working Group held in 2024 are added as a reply to this topic.

Make each reply a wiki post , that way other attendees can edit the notes. This can greatly reduce the burden of note-taking allowing that person to participate fully in discussions without worrying too much about missing important details.

[sonyafiddes]

Atmosphere WG Meeting 22.02.2024 minutes
22 Feb 2024
15 participants on Zoom
From: UNSW, BoM, Monash, ACCESS-NRI, CSIRO, UTas, UKMO

Matt Woodhouse:

• Welcome & Acknowledgment

Chermelle Engel – Tutorial on STASH

• We are talking about the ACCESS model, which is a complex model with a lot of details
• Writing output needs to be carefully considered with respect to time stepping and variables. This is a very complex task and also depends on particular needs (eg. forecasts, reanalysis, climate scale)
• In ACCESS this done via STASH (cudos to those who built it!) which is very flexible but modification needs to be done carefully
• Pre-defined STASH packs provide default settings that would meet the majority of users (hopefully).
• In the RNS there are five default STASH packs, plus the option to set your own either in the GUI or by creating your own STASH packs.
• Creating your own STASH packs gives you flexibility to turn on and off your outputs as you need it (eg. for a period of particular interest).
• Example of Canberra hailstorm where Chermelle creates new STASH profiles and requests (watch the recording).
• Chermelle recommends turning on really high-res stuff only for the specific period you are interested in

James Warner, UKMO, visiting the BoM: ‘K-Scale: Scale interactions within the Tropical Easterly Jet’

• Comparison of two configurations over the tropics RAL3.9 and GAL9 in the UM at 10km resolution
• Representation of regional scale convection may impact at the global scale; an up-scale impact
• Tropical Easterly Jet has important implications for the Indian and West African Monsoon
• GAL9 produces are very large jet, larger than ERA5, RAL3 produces a closer jet to ERA5
• When you have consistent physics with the driving model and the regional model you get similar results to the parent model, mixing physics (between driving model and regional model) can introduce differences
• In GAL9: Weaker convection, poleward branch of Hadley Cell is weaker, altering the jet
• Improving convection could help global models resolve issues with Indian Monsoon
• James is here for another week if you have more questions

Heidi Nettelbeck: ECR and student engagement:

• Can we encourage students and ECRs to attend these meetings
• Let Heidi know if you have ideas in how to get people more engaged
• Matt suggests the words ‘working group’ could put people off

Community updates

Belinda roux (BoM)

• BARPA-R are available on the NCI, BARRA R2/RE2 is also available
• ACCESS-AE is under development now, as is the data assimilation for ACCESS-A
• BARPA-C and BARRA-C are also under development
• Joint BoM-RND/UM workshop on convective scale modelling 9-13th September

Matt Woodhouse (CSIRO)

• We have a year to do model configuration, tuning and evaluation before deck experiments must start.
• Next FY model testing and tuning (long simulations & spin up), documentation
• 25/26 FY deck experiments must begin
• Time is VERY short
• Right now no one is funded to do any CMIP7 dev… Rachel Law is trying to coordinate this, including large support from ACCESS-NRI and NCI. A lot of science needs to come from BoM and Universities.
• Ideally, CM3 and ESM3 will have new physical climate model (UM13x), new ocean model (MOM6), new sea ice model (CICE6) and new land surface (CABLE4)
• Unfortunately, for CMIP6 no tuning was done for ACCESS atmosphere… this was not ideal so hopefully we can do better this time around
• Get involved: ACCESS Evaluation Hackathon is happening in a few weeks – this is a good way to get involved. Follow the CMIP7 announce topic CMIP7 Announce
• See recording for info-graphics
• The fast-track proposal is currently open for comment for CMIP7, if you would like to contribute there.
• Fresh-eyes in CMIP is a network of ECRs to work with CMIP.
• See recording for info-graphics / links

Steve Sherwood (UNSW)

• W21C is in process of advertising a tranche of new postdocs, ads should be appearing soon.

Heidi Nettelbeck: Storage and Compute

• We have 875kSUs and 95TB of storage to use this quarter. Post on the forum if you would like to utilise some of this. Start a New Topic in the Atmosphere Experiment sub-category and it will automatically populate the topic with a template.

Next meetings:

• Should we have a fixed time?
• Next one will probably be late March – date TBD
• Interest in doing a joint meeting with the forecast & prediction WG on the single column model, likely in April
• Agenda is open to all to contribute!

[Claire_Vincent]

Atmosphere WG Meeting 27.03.2024 minutes

25 Attendees on Zoom:
Heidi Nettelbeck, Claire Vincent, Yi Huang, Matt Woodhouse, Sonia Fiddes, Paul Leopardi, Steve Sherwood, Zhangcheng Pei, Chris Chambers, Andrew King, Marty Singh, Robyn Schofield, Craig Bishop, Davide Marchegiani, Chermelle Engel, Tim Raupach, David, Greg Roff, Chang Xu, Clemente Lopez-Bravo, Kim Reid, Emma Howard, Charmaine Franklin, S Cooper, Claire Courage.

Welcome new Members:

• Zhangcheng Pei (Jason) - UTAS - Running regional nesting suite over Davis Antarctica
• Andrew King - Unimelb
• Chris Chambers - Unimelb - Working on ACCESS AUS2200 - SST Sensitivity case studies
• Robyn Schofield - Unimelb - Atmospheric Chemist - representation of chemistry and aerosols in the model
• Craig Bishop - Unimelb - AUS2200 interests

Discussion: ACCESS over larger regional fixed domain - eg tropical domain - is there value in developing this capability?

→ Options discussed:

• Tropical Channel → How big would it have to be? Met Office have a tropical channel domain over the whole tropics with over 8000 grid points
• Expanded AUS2200 domain with Indian / Pacific Ocean rather than tropical.
• Different physics for tropical domain? → No, the new version of RAL2.3 has unified mid-latitudes and tropics
• Simulations to explore MJO / moisture questions - how is the moisture getting to the leading edge of the MJO? The MetOffice channel experiments might be too short for this.
• How large a domain do we need to generate an MJO ?
• If we make a fixed domain, it should be tropical and including part of the sub-tropics, and interactions with the tropics.
• Simulations could support monsoon feedbacks, wind induced surface fluxes → we need a simulation with a good monsoon. Could design experiments with prescribed winds, so test whether the wind / surface flux feedbacks are changed.
• Radiative-Convective-Equilibrium simulations with the ACCESS model? → There is an idealised configuration for the UM, but it is not in the nesting suite.
• A flexible domain might be a better approach. Chris Chambers & Dale Roberts are already making progress with moving the Aus2200 domain to the east.
• Craig suggests sending out a wider call for experiments - include on Hive Forum, but also to wider audience (email, CoEs, AMOS, etc.).

Atmosphere Community Updates:
Updates from the three University nodes about Weather of the 21st Century:

• Steve Sherwood (UNSW): Currently hiring Post-docs across 5 partner unis on:

  • Weather Systems Dynamics,
  • Climate Variability and Weather Systems,
  • Weather Systems in a Warmer World,
  • Weather Resources,
  • High-impact weather
  • Modelling Science.
    Centre will hire modelling specialists on topics of ocean, atmosphere, land, ML and AI. Positions either already advertised, or on the way to being advertised. W21C will have a modelling lead CI, who will coordinate with NRI.

• Marty Singh (Monash): - At Monash there will be one level B and four level A post-docs. Positions close around 7th April.

  • Experiments with idealised warming / idealised SST anomalies.
  • Fine-scaled coupled interactions - one of the goals to develop a regional coupled model at high-res.
  • Energy resources - simulations to support that.

  Priorities:

  • Moveable regional domain with variable res
  • Couple regional model
  • Implement Physics changes / experiments
  • Documentation

  Centre is focussed around ACCESS. Science drive, experiments support science questions.

• Andrew King (Melbourne): W21C will try to run common experiments that are useful to multiple people

  Positions on High-impact weather under climate change, Tropical Variability, Coastal Wind Resources. Level B atmospheric modelling - focussed on high-resolution model development. Tropical variability position, with focus on the monsoon - high resolution tropical simulations would be particularly useful. High-impact weather - phenomena like fog, will heavily use the ACCESS model. Coastal wind resources - high resolution modelling of coastal processes, including high-resolution coupling.

  Question: Will there be a process to become an affiliate, for those who are not CIs?

  • Students can get involved in some aspects of the centre, even if not supervised by CI in the centre.
  • Opportunity for others to become AIs / PIs.

Storage and Compute resources for Atmosphere WG

• Compute: We have 875 KSUs for Q2/2024. Submit on the Forum.
  Please make a topic on Forum to apply for KSUs → see How to Apply for Atmosphere WG Resources post for guidance.

• Storage: ACCESS-NRI has storage available (100TB).
  Move towards storage in experiment folders, instead of data being stored in people’s personal directories. Working group storage is temporary, until data is published.

Next Atmosphere WG meeting:

• Trial a fixed meeting time slot: Wednesday 2-3pm (Monthly)
• Next meeting end of April / early May (TBC)

[Matt_Woodhouse (Matthew Woodhouse)]

Joint meeting between Forecasting & Prediction, and Atmosphere working groups
8 May 2024
Chaired by Kim Reid
27 participants from both WGs, full range of institutes

Debbie Hudson (BoM), F&P WG overview
Intro to F&P working group: data assim, seasonal prediciton, machine learning, for forecasting modelling - activities not currently supported by NRI
Key activities:
Identify how NRI could support DA and ML in the future
Use F&P to bring together community working on ML for modelling and prediction
Scope interest in community usage of ACCESS-S. Started running training on ACCESS-S
Keen to hear feedback comments on how NRI could support ML and AI

How ACCESS-NRI could support ML/AI

The FPWG welcomes your feedback on this document. Please provide comments/input by using the reply function, or editing directly in the google-doc version (in track-changes) How ACCESS NRI could support ML/AI Machine learning (ML) infrastructure is the software and hardware foundation required for the development and deployment of ML models. Although ML models and infrastructure implementations differ widely depending on the application, there are core components of ML infrastructure that can …

You can also provide input/comments by reply on the Hive document, or in track-changes in the google doc: How ACCESS NRI could support ML/AI - Google Docs

Charmaine (BoM), Atmos WG overview
Intro Atmos WG: goal is to establish and support a community, identifying areas for collaboration
Yi Huang (UniMelb), overview of uni research
Matt Woodhouse (CSIRO), overview of CSIRO research

Martin Dix (CSIRO, NRI), Single Column Model
SCM has full UM physics, not UKCA (UKCA require advective tendencies of all the species. Could perhaps be derived from the UM)
runs from rose/cylc like full model
easy to run debugger, fast, netcdf output
ideal platform for developing and testing code
Bethan White (BoM): development example using SCM to test a sea breeeze parameterisation
Charmaine: SCMs have also proven to be really useful for explaining different cloud feedbacks across climate models https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2013MS000246

Calum Knight (UTas)
Introduction to EMC2, an open-source ground-based lidar and radar instrument simulator and subcolumn generator for large scale models
now able to use with ACCESS / UM
Aiming to lodge back into repository so that it will be much easier to use with UM output

Discussion – find collaborations between groups
Craig Bishop – any interest in developing a TL or adjoint model?
Kim – could EMC2 be useful for estimating rainfall over Southern Ocean, where there are sparse observations? Sonya – yes, that’s one of the objectives. Yi – rainfall relatively easy, mixed phase is daunting

EMC2? How easy is it to learn how to use?
Took Calum a few months, creating model class was biggest task.

Bethan – COSP available in UM, very useful package

Julie – how does DA benefit non-direct users of DA? Outside of Bureau there is no capacity for using DA. Running models from observed initial conditions would be valuable

Matt: Newtonian relaxation available in AM2/CM2, and also RNS. Can be used to provided initial conditions to atmospheric simulations

Chun-Hsu has spectral nudging working in UM

Heidi: think about possibilities for sessions around NRI annual meeting in September

Charmaine: don’t forget to register for Momentum workshop

[cnf (Charmaine Franklin)]

Atmosphere WG Meeting 12.06.24 minutes

Presentation from Matt Woodhouse - Regional simulations with aerosols

• Work to develop a modelling system to simulate and understand impacts of marine cloud brightening (injection of sea salt aerosol into the atmosphere to increase cloud cover and reduce surface shortwave radiation and hence surface warming)
• Have set up the Regional Nesting Suite (RNS) to run with GLOMAP-mode. The suite runs an N216 global model simulation to provide the nested regional domains with the LBCs. The global model is nudged to ERA-5. The first large domain is 20km resolution and is running with the RAL3 configuration, noted that this is not designed for 20km resolution. And then another 4km smaller nested domain.
• Have “coupled” the RNS to EMS, an ocean model with biogeochemistry. The “coupling” is offline and involves running the atmosphere and ocean models uncoupled for a day, and then sharing the different models’ forcing data.
• A case was shown where increasing sea salt aerosol did have a response in the model.
• Discussion covered the need to assess simply turning on the convection scheme with it’s default settings in the regional model configuration that does not use the convection scheme. For this modelling application where the focus is on clouds, the impact of the convection scheme is likely to be significant. Also discussed how coral stress can be reduced by dimming clouds without needing to have a large impact on cooling ocean temps.

Presentation from Martin Dix - Ancillary files

• Ancillary files, with static or time varying, get added to the initial conditions through the reconfiguration
• There is new code for the ancil generation ANTS, but some ancils are still produced using the older code CAP
• Master files are available for present day and at different resolutions
• Ancil generation is not simply interpolation to the required grid, but there are many changes that are needed and performed for consistency and this is done with the ANTS/CAPS software
• Coupled model must have same mask for atmosphere and ocean, start with ocean and interpolate to atmosphere
• Need to be careful producing ancillary files for high resolution grids, e.g. no Port Philip Bay in ~10km global model mask
• Apart from observational datasets, some ancils come from UM runs or ERA5, e.g. aerosol climatologies come from climate runs
• Standard locations for ancil master data on gadi, work in progress to organise the ESM1.5 and CM2 ancils
• Modifying ancils, need to be careful with ensuring everything matches, mule and ANTS much better tools than those available in the past

Heidi - Experiment proposals for next quarter and ACCESS-NRI Workshop

• Start a New Topic in the Atmosphere Experiment sub-category and it will automatically populate the topic with a template. Have a look at previous proposals to see the level of detail required.
• Please think about breakout session topics for ACCESS-NRI Workshop and reply to email sent today.
• Will have a working group meeting on Thursday 5th September. Half day meeting, half day tutorial probably on RNS

Charmaine - Bureau Convective Scale Workshop

• Poster abstract submission will open late next week for the in-person poster session

AOB

• Sonya mentioned would be good for the ACCESS-NRI to develop tools to postprocess model output and provide training
• Yi mentioned evaluation tools and the desire to have these tools that people have and will develop as part of a shared resource

[Claire_Vincent]

Atmosphere WG meeting 24/07/2024 minutes

1. Processing AUS2200 output using ACCESS-MOPPeR (Paola)

Version stable from next week

Documentation at access-mopper.readthedocs.io/en/class/gettingstarted.html

Require two steps:

1. Creating mapping file (csv file with names of CMIP style variables, matched to name of variable in UM output.

2. Run the post-processing

.yaml file - enter details about the model simulations, job submission details and global attribute details

Why do we need to post-process?

• to get meaningful variable names
• to put everything on the same grid
• to prepare data to publish
• to reduce the amount of files you’re keeping
• to get pressure levels
• to define new derived variables etc.

What does CMORise mean?

• Tool used to post-process CMIP data, forcing data to their standard, with precise axis definitions etc.
• What you need to do for things like CMIP6, CORDEX etc.

Will the .yaml files be the same for every model run?

• Variable list might be mostly the same if you’re using the same model - may be able to use the same mapping if the experiments are basically the same setup.
• Only takes 10 seconds to run on Gadi.
• More complex process is adding extra mappings etc.

Does it also handle the raw UM output (pp files)?

• No
• You can add a step to include most of what the archiver does to output netcdf from the experiments.
• It would be useful if Dale’s code from AUS2200 that does this be ported to different UM regional versions. Code to do this is in suiteID: U-cs142. Note creation step and verification step. Using UM2NetCDF4.

Does it work on the ocean?

• Yes, it should

Does it handle odd dimensions (eg. AOD has 7 levels)?

• Possibly. Send Paola more details.

All the tables / mappings are on the website

https://github.com/ACCESS-Community-Hub/ACCESS-MOPPeR/tree/main/src/data

ACCESS-MOPPeR/mappings at main · ACCESS-Community-Hub/ACCESS-MOPPeR

Most recent documentation

https://access-mopper.readthedocs.io/en/class/gettingstarted.html

2. Do we want an atmospheric model catalogue? (Navid)

Info from Navid about COSIMA cookbook

• develop configs
• analysis, science (main)
• perturbation runs
• run global ocean models

“My coding efforts have lasting impacts and help others move forward!”
→ Share code, notebooks, etc
→ Cookbook is collection of curated and well documented notebooks

“Let the intake catalogue and model simulations unite us!”
Everything is on a git-hub, including documentation and examples. Cosima-recipes.
How would this look for the atmospheric model?
Sample intake catalogue for AUS2200

How are students / people new to coding encouraged to feel confident to contribute?

• focus on friendly community
• encouraged to make small contributions at first - eg post a question
• at the latest hackathon, tutorials at different levels from beginners to advanced users were held, including how to make pull requests etc. Students gradually become familiar with it, discussing things publicly

Intake catalogue - added builder class to make it easier to add more things int.

ACCESS-NRI has someone new starting to work on intake catalogue. If you have model output that you would like to catalog with intake, please get in touch.

3. WG compute resources user report (Sonya)

Doing big evaluation of ACCESS-AM2 model. CCNs are not well representing in models - impacts radiation and precipitation in southern ocean. Data from 7 voyages in Southern Ocean.

Taken all CCNs and compared with ACCESS model running with aerosol model. ACCESS-CM2 but without ocean (prescribed SSTs).

Eight experiments. Experiments re-run with ACCESS-NRI compute due to problem with DMS climatology in anciliary files in initial runs.

Results: CCN captured well at Kenanook/Cape Grim, but poor elsewhere.

To be presented at ACCESS-NRI workshop in more detail.

4. BoM R&D workshop (Charmaine)

Registrations nearly at capacity, can still register for online attendance

5. ACCESS-NRI workshop (Heidi)

Abstract submission closes this weekend. Please submit your abstract! Next meeting of this group will be at the workshop.

[cnf (Charmaine Franklin)]

Atmosphere WG Annual Meeting minutes 5/9/24

Science talks

• Christian Jakob: Atmospheric modelling needs to build the weather-climate bridge

  • 21st Century Weather Research Program - atmospheric modelling needs
  • Weather systems science needs models and obs
  • Higher resolution GCMs shown to better represent trends and SST warming patterns
  • Need a 25km global model (resolution sits in between coupled NWP and seasonal)
  • Need a large domain ~5km convection permitting model
  • Discussed links between climate drivers and weather systems, and the need for higher res models to better represent the associated weather and forcings such as topography
  • Need a 1km Australian model
  • Need LES resolution relocatable small-domain model
  • Qs: Need to move on from AUS2200, great start but have other needs and want more flexibility for running different domains and resolutions. Noted that the regional nesting suite can do what is needed, seems like education and training is the key thing missing rather than developing the technical infrastructure

• Shaun Cooper: ACCESS-AE: a national, km-scale numerical weather prediction ensemble system

  • Introduction to ensemble science and the motivations for running ensembles to quantify uncertainty
  • ACCESS-AE: 12 members, 2.2km resolutions, RAL3.2, 48 hour forecasts
  • Perturbations from IC, LBC, physics parameters
  • Dec 10 - 17 2023 trial to test developments to the random parameter scheme, TC Jasper, fog, fire weather, tornado, heavy rainfall
  • Fractions skill score to assess ensemble precipitation performance, ACCESS-AE precip compared to GPM shows good skill and the new random parameter scheme is marginally more skilful for small rain accumulations with an increase in skill at higher rainfall accumulations
  • Spread/skill relationship for near surface fields, temp and winds, new random parameter scheme shows better spread/skill relationship with the increase in spread greater than the increase in RMSE
  • Qs: ACCESS-TC model could be replaced with a larger domain ACCESS-AE, the current domain is not large enough. FSS is state of the art metric to assess spatial performance and spread/error shows that the ensemble is under spread, as are all convective scale ensembles, limit of running members is compute resources. Note that ACCESS-AE is a research system running at NCI using the regional ensemble nesting suite (same functionality as the regional nesting suite so you can run any domain at any resolution with multiple nests).

• Mathew Lipson: A BARRA-R2 driven Regional Nesting Suite

  • Suite to assess JULES changes on 12km resolution GAL9 regional climate simulations
  • IC and LBC provided by BARRA-R2 with frames on disk, daily updating SST from ERA5
  • Ran through the tasks in the suite and compute requirements
  • 13 month simulation completed compared near surface temperature to AWS and BARRA-R2, not as accurate
  • Specific humidity also not as accurate as BARRA-RS but clearly not expected to be
  • Rainfall has a different pattern and biases compared to BARRA-R2
  • Can set up a smaller nested region, e.g. 1.5km, since this is the nesting suite
  • 12km model is cheap to run compared to convective scale national models
  • Discussed outstanding technical issues and whether the community is interested
  • Qs: Rainfall bias from tropical Australian variability, benefits of comparing driving data ERA5 and BARRA-R2 would be interesting particularly given the issues with land initialisation, no evaluation of land surface from 13 month simulation yet

• Thi Lan Dao: Joint modulation of coastal rainfall in Northeast Australia by local and large-scale forcings: Observations versus AUS2200 simulations

  • Coastal rainfall affected by both local variability and large scale climate, aim to understand the interactions between these
  • Using AUS2200 as need km-scale model to represent local processes, ERA5 with BARRA-R2 soil moisture
  • 3 MJO events, 180 days
  • Compared simulations to radar derived rainfall, captures the coastal rainfall reasonably well so the model is a viable tool to understand the processes responsible for generating the rainfall patterns
  • Analysed vertical cross-sections to understand off-shore/onshore rainfall propagation, noted the role of the sea breeze and density current in the lowest levels as well as the background wind
  • For rainfall over land, convergence of sea breeze and westerly winds
  • Limited samples to fully understand scale interactions

• Claire Vincent/Andrew Brown: ACCESS modelling for coastal processes

  • Planned activities: coastal winds, using high res models to understand BL structure
  • Motivation: wind farms and the need for more energy when solar stops for the day
  • Assessed diurnal cycle of wind from BARRA for 3 regions coast, off shore, inland
  • Night time peak in wind inland, daytime complex orography, night off shore
  • Assessed winds at Gippsland where Australia’s first off shore wind farm will be located
  • Variability of winds translates into large changes in wind power
  • Sea breezes in the UM have been assessed in various studies in various regions, as turbines are at ~300m really need to understand the vertical structure of the sea breeze, BARRA at 12km looks good
  • Also looking at diurnal cycle of convective gusts to understand wind variability
  • BARPA-R vs BARPA-C demonstrated the need for km-scale models to capture high winds
  • Science questions: role of sea breezes in modulating off shore winds, are there strategic locations for wind energy that would help balance power demand, role of SST gradients and coastal land, can those processes be resolved in high- resolution coupled models
  • Qs: Will look at more than Victorian coastline but around the country, higher density of vertical levels in the model BL would be useful - note that this is what the UM vertical levels sets do, how well are downdraft gusts represented - we know that 4km model looks much better than 12km

Discussion

Reference datasets

• Update from ACCESS-NRI (Clare Richards)

• ACCESS-NRI has NCRIS funding for storage of community reference data sets

• Datasets that are accessible, trustworthy and (re)useable

• High level process described includes review, prioritise, propose, approve, release, maintain

• Atmosphere WG requests grouped into different data sources

• Scott noted that any data sets from the Bureau at NCI that are useful for the community should be flagged, as discussions about NCI maintaining data sets are occurring

• Total storage available to ACCESS-NRI 600TB, looking to expand

• Takes a lot of effort to document and curate data so want to understand what the community highest priorities are

• WG needs and priorities

  • Discussion on Group 2 data
  • Matt on ERA5 processed data for nudging, needed for composition modelling, 3 people currently using this plus 2 more soon. Want the full time series, question about the temporal resolution required. Can’t use the NCI ERA5 data. Bec has scripts, they want ACCESS-NRI to develop their scripts and take over the data curation and management.
  • Sonya on SST ancillary file data, needed for AMIP runs using CABLE, uses Met Office data but processed onto grid for ACCESS AMIP.
  • Chermelle on OSTIA SSTs, OSTIA is high resolution so would be useful for AUS2200 and km-scale models rather than using ERA5.
  • Yi on GPM, AGCD, Bureau AWS. GPM is possibly supported already by Paola. AGCD useful for land WG too. Up to date data required (3 months ideally), but that means working with the Bureau who generate the data and updating takes a lot of effort. Bureau station data needed for high temporal resolution model assessment - think the community needs to be clear about what they want e.g. temporal resolution as there is 1 min data available for some stations, what time period, etc.

Atmosphere Cookbook (Heidi)

• Navid has helped setup a GitHub repository with some Atmosphere ‘recipes’ to analyse model output
• Collated on the Atmosphere-Cookbook Github repo to share and document resources with community
• The cookbook uses ACCESS-NRI Intake Catalogue to load data (e.g., currently from Aus2200 and CMIP6 data)
• Anyone can contribute (or get help) by opening a new Github issue
• Went through the repository, showed Chris’s recipes to produce plots, went through an example to show how to modify to read in different data, variables, etc
• Yi and Chris note that they think this will be useful to help new users get started
• Emma asked whether this will be compatible with ESMValTool or other existing community tools, which was noted would be good but ESMValTool uses its own ecosystem but could be some similarity with some recipes
• Paul asked about the scope, COSIMA does produce publication quality figures
• Clare noted that this could provide information about what datasets are being used
• Matt asked about data ingestion. Heidi noted that you can only use this through the ACCESS-NRI Intake Data Catalogue, but as Matt pointed out there is a need for quick looks of lots of experiments that won’t go into the intake catalogue. Needs a data ingestion script that doesn’t use intake catalogue - what data format, UM file or netcdf, most users only look at netcdf model data.
• Discussion about data conversion, many existing tools.
• Should we have an Atmosphere Cookbook Hackathon?
• How is attribution of contributions acknowledged?
• You can add your model data to ACCESS-NRI Intake Catalogue, which is used to load data for the Cookbook recipes. Sonya Fiddes is keen to contact ACCESS-NRI to do this.

[Paul.Gregory]

Atmosphere WG Meeting 23/10/24 minutes

15 participants

Luke Harrison - Update from ACCESS APS2-APS3 changes and impacts on cloud clover over the Great Barrier Reef.

• Working on Marine Cloud Brightening (MCB)
• Using aerosols to increase albedo of low marine clouds
• Using CSIRO eReefs currently forced with BARRA-R1. Before that tthey were using ACCESS-R.
• Large difference in Oktas over summer periods (Dec-May) from 2015-16 b/w BARRA R1, R2 and ACCESS-R.
• Compared against Himawari-8 cloud products.
• Even though the Himawari cloud is probably biased high (because it can’t detect low clouds under high ones), results suggest the models continue to underpredict amounts of low cloud.
• Q : from Charmaine. Cloud cover doesn’t necessarily take into account optical properties (e.g. surface radiation, optical depth)
• Q : From Yi. Dan Harrison has a report where we compared cloud cover statistics against different satellite cloud products. Products with active sensors are probably a better source of ground truth.
• Q : From Paul. Celiometer data at coastal airports another source of ground truth?

Charmaine Franklin - R&D workshop summary

• First joint workshop with the UM Momentum partnership.
• UKMO has had operational convective-scale modelling (UKV) since 2010. BoM since 2017 (ACCESS-C2).
• Collaboration to build a km-scale science configuration that works at mid-latitude and tropics (RAL3)
• 265 registrations with strong international presence and Australian academic community.
• A lot of talks on the NextGen model (Lfric) as UM development has now ceased.
• RAL3.3 has been approved and regional suites (nesting, ensemble nesting and coupled) are being updated to UM13.5. Will be available on NCI soon!
• RAL3.0 can miss heavy rainfall due to implementation with new cloud microphysics suite CASIM
• Convective Scale Evaluation Toolkit (CSET) tutorial was very popular
• LFric training was held next week, both global and regional. Visualisation is different as the grid is no longer a regular lat/lon
• Good interaction b/w researchers and forecasters
• Workshop website contains all the presentations and slides

Zhangcheng Pei - UTAS. Antarctic Cloud simulation

• Running UM v13.0 in RAL3.1 (CASIM + Bimodal) at 1.5 km at 10 minute resolution, embedded in ERA5 centred at Davis station on Antarctic coast.
• Case studies on significant snowfall.
• Experiments with aerosol climatologies, changing Cloud Drop Number, improved orography and V21 INP parameterization.
• Aerosol climatology underestimates aerosol concentrations.
• V21 INP enhances liquid water and improves downwelling long-wave radiation, at the cost of overly diminishing short-wave radiation.
• Uses EMC squared simulator to allow model/obs comparison which may be of greater interest. This is now integrated into a suite to allow pseduo lidar/radar products (in this case)
• Q : Yi, what kind of temperature ranges are we looking at?

Clare Richards - ACCESS NRI updates on records and datasets

• Frameworks for reference datasets and requests.
• Hoping to speed up approval processes.
• For Atmosphere WG requests, publication of AUS2200 datasets has been approved, currently in-progress (catalogue IDS and DOI etc). Should be ready in a few weeks
• Three datasets for next release are:
  • OSTIA SSTs,
  • SST/SIC Ancillary files
  • UM nudging based on ERA5 at N96

Heidi - ACCESS NRI quick updated on resource availability.

• Still have 228 kSU for gx60. Apply if you need resources if you need to run an experiment.
• ‘Use it or lose it!’
• Applying for Atmosphere WG Resources

Next date?

• Pencilled in for Thu 28th?

[cchambers (Christopher Chambers)]

Meeting Minutes 4 Dec 2024: AUS2200/ACCESS-NRI Atmospheric Modelling WG Meeting
14 participants

Intro
Yi – AUS2200 as a CLEX project is winding down
2 science talks were scheduled, but Ewan Short had to cancel today.

Andrew Brown – Sea breeze climatology and characteristics. – preliminary results.

• 21st Century project,
• Renewable energy – strong daily cycle in supply.
• How cycles in diurnal wind can play a role in coastal regions.
• Sea breezes affect wind power.
• Develop method to detect sea breezes from model data.
• Regional ACCESS config RNS for targeted sea breeze regions.
• Sea breeze detection using frontogenesis method using moisture -“moisture frontogenesis”.
• Issue – many other regions of signatures – convection etc., making detection tricky – additional constraints needed.
• Method 2 – rate of change of moisture convergence.

2nd part of plan

• RNS 1 km resolution centred on 1) Bass Strait 2)NSW coast – several months to a year simulations.
• Other tests – surpress SST variability, use high-res ocean model output.
• Wishes to run tests to try different model options and setups if SUs are available.

Questions/comments for Andrew

Paul G. about what methods BOM uses for sea breeze detection
Chermelle about whether to do back to back simulations or one continuous simulation.
Peter S. Restart and perhaps nudging could help for long simulations.
Gradients in relative humidity as alternative.
Matt L. long simulation – 72 hour cycles vs free running.
Cycles – step changes in temperature etc., problem.
Long runs need updating SST and soil moisture.

Yi Huang - AUS2200 Story

• Initially AUS2200 project was led by Todd L.
• Captures a broad range of scales in one domain at consistent convective resolving resolution.

Aims of AUS2200

• Unite the national atmospheric community
• Make efficient use of resources
• Do transformative science that has clear path to impact
• AUS400 was predecessor 400 m resolution used huge amount of resources such as a week of wall time. So AUS2200 was aimed to give a balance of high-res vs resource consumption.
• Dale Robert in particular improved efficiencies. 10 to 18 times speedup.
• Opened up longer simulations for more cases.
• 16 Experiments and all data is now published thanks to Paola Petrelli and ACCESS-NR
  dois available for the data.
• Hooman’s led work – convective rolls, downward mixing leading to dry air and bushfire development.
• Chris C – role of SST in ECLs with Coral Sea most important.
• Dao Lan – MJO and local scale impacts on QLD rain. PhD.
• hanks to Scot Wales for producing tutorials/guide.

Chermelle Engel – Limited Area Modelling

• Aim – make RNS easily workable for more people.
• Bounday conditions – ERA5, blockiness in land surface data, ERA5-land better (0.1 degrees) but GRIB issues regarding getting the best resolution.
• Land options accessible in Rose Suite, can choose between ERA5-land or BARRA2-R

Comments
Yi - Move towards ACCESS-NRI supported config of RNS

Heidi Nettelbeck - ACCESS-NRI Atmosphere team 2024/25 Work Plan

• ACCESS-Hive Forum - use RNS subcategory for further discussion.
• ACCESS-NRI Atmosphere team 2024/25 Work Plan. 6-member team.
• Regional Model development (ACCESS-NRI supported configuration of RNS, 2-level nest)
• Later development, CABLE instead of JULES for land surface
• Ancillary tools:
  • development of AMAMI (convert um files to netcdf, modify, etc.)
  • Generating ancillary suites for climate models
    and more.
• ACCESS-ESM Earth System Model:
  - ESM1.5 release and ESM1.6 for CMIP7 fast-track experiments
  - Later, ESM3 release
• ACCESS-CM Coupled Model:
  - CM2 release
  - CM3 development: NUOPC instead of OASIS (more flexible coupler); Merge NUOPC coupling and AM3 development
• ACCESS-AM Atmosphere Model:
  - AM3 beta release with post-processing
  - High-resolution global AM3 testing in collab. 21st Century Weather
• Cross-organisation projects
  - Releases of ACCESS models
  - ACCESS-Hive Docs and Forum support
  - Model Optimisation
  - Working Group liaisons
  and more…

Wrap-up

• Yi – resources available for simulations- consider
• Next WG meeting in February 2025