Meeting Minutes 2023: Atmosphere Working Group

Notes from each meeting of the Atmosphere Working Group 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.

Atmosphere WG kick-off Meeting 17.05.2023 minutes

17 May 2023 (10:00-11:45)

24 participants online via zoom

From: BoM, CSIRO, UTas, UNSW, NRI, UoM, CLEX, Monash

Noted that Zoom is problematic for BoM users, banned on Bureau laptops

Slides: AtmosWG_kickoff_170523.pdf (2.3 MB)

Welcome and acknowledgment

  • Acknowledgement of traditional owners

Round table intros

  • 1 minute intros from all attending
  • Wide variety of backgrounds in community: research interests, UM expertise, atmospheric modelling expertise


  • ACCESS-NRI created to support development and research with the ACCESS modelling system

ACCESS-Hive and Forum

Intro to Atmosphere WG

  • Key aims – establish Australian atmospheric modelling community, currently missing

Why are you / we here?

  • Community building: atmos modelling community hasn’t been as well organised as other communities, e.g. land, ocean. Would be great for atmos community to reach that level of community organisation. Stronger to have a coherent voice, rather than singular voices.
  • Identify strategic priorities
  • Several people identified as being new to UM. Atmos WG is way to access training, docs, tools etc? Acknowledged that this is a priority for NRI. Noted that different ACCESS configs require different training
  • Advanced training would also be valuable for more experienced users – allow them to solve more complex problems
  • Think outside of box in delivering training / info. Videos?

Terms of reference of Atmos WG

Structure / near-term objectives

  • Structure / content of meetings
    • Previous ACCESS evaluation meetings (held a few times a year by Lawrie Rikus at BOM) are missed by community. Resurrect those in some format?
    • Science presentations, long / short
    • User problem solving, new and experienced
    • What are people planning, where are the gaps?
    • Pick a topic every meeting? Have discussion around that. Where is atmos community placed? e.g. CMIP ambitions. Noted that there is an Earth System WG. How to integrate model in community? Promote use of UM. How to collaborate between WGs, communities
  • Community experiments
    • what does community want?
    • goal for hackathons
    • establish as community resource
    • publicise pre-existing simulations that could be valuable
  • How to reach non UM users, e.g. WRF community

Meeting frequency

  • other WGs meeting fortnightly
  • what is community preference?
    • Great to have at least one in person meeting per year, make it a full day
    • otherwise ~6 meetings per year? Or monthly? Do we have enough to discuss to meet monthly?
    • Initially it is important to communicate what we are all doing, higher frequency might help with that
    • Forum has a post for topic suggestions
    • Monthly meetings initially, mix of science / technical topics
      • how to use forum would be valuable
      • Several 10-12 min talks, informal discussion style? Or a single longer 20 minute talk? Lightning talks also to cover intros etc?
      • Meeting length 1 hour

Compute resource

  • Atmos WG has 1.25 MSU available
  • Guidelines to be released shortly, used for community experiments

Atmosphere WG Satellite meeting: to be held during ACCESS-NRI annual workshop 5-8 September 2023. More details to follow!

** Note** Please watch the Atmosphere Announce topic on the ACCESS-forum to receive information on upcoming meetings and events! This youtube video explains how to watch a topic on the ACCESS-Hive Forum.

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Atmosphere WG Meeting 22.06.2023 minutes

** 22 June 2023 (11:00-12:00)
14 participants online via Teams

  1. Admin:
  • Yi Huang volunteered to take today’s meeting minutes.
  • Sonya Fiddes volunteered to take the next meeting’s minutes (in July).
  • Need volunteers for science talks next meeting - ideas welcome!
  1. Science talks:

a) ACCESS-A: Development of the Australian domain convective-scale numerical weather prediction model (Shaun Cooper, Belinda Roux, Mat Lipson BOM).
Questions/discussions: What resolution is used for ensemble runs? What GPM products are used for rainfall evaluation.

b) Atmospheric modelling over the Southern Ocean (Sonya Fiddes, AAPP)
Questions/discussions: Uncertainties of aerosol climatology over the Southern Ocean. Observed vs simulated radar reflectivities.

  1. WG Training needs:

General needs:

  • What Scott Wales has originally setup (BOM documentation?) was useful for beginners.
  • Strengthened links with the Met Office to feed changes into model development.
  • Helplines (e.g. answering specific questions).

ACCESS-NRI Workshop (Sept 5-8) specific needs:

  • Training on how to make changes in the UM code/ to the trunk (currently need a lot of hand-holding from Met Office).

What do students need:

  • Documenting model setup and simple instructions to run the model, including an overview of basic aspects like where ancillaries are stored.
  • Rose-cylc tutorial for any configuration (basic-level users)

Other suggestions for basic-level users:

  • It would be useful for a new model user to document the difficulties and problems they encountered along the way and how their problems got resolved (for more experienced users this is somewhat foggy).

Do we need a AUS2200 training session at the ACCESS-NRI Workshop?

  • ACCESS-NRI encourages ECRs to learn and run the model.
  • Hackathons are useful exercises, but focused more on coding, post-processing, using tools to analyse of model data.
  • The level of training similar to what was provided at the UM training workshop would be helpful (people could learn to run a model for real).
  1. Documentation:
  • Addressed in the above discussion on training needs, but further discussion needed.
  • Navigating around ACCESS-Hive remains a bit challenging. These training videos are helpful.
  1. UM research activities:
    Regarding this table, some people cannot see the “Edit” button on the bottom RHS of this wiki post. Heidi followed up on this issue and apparently you need to have a Trust Level 1 to edit a wiki post on the forum, which can be achieved simply by reading only 10 minutes of forum posts.
    If you still have difficulties filling out this table, then you can reply directly to the post and we will add it in the table.

  2. ACCESS-NRI Workshop (5-8 Sept ):
    Yi Huang gave an update from program committee meeting:

  • Program has not yet been finalised, but a general training plan was developed.
  • Confirmed that we only need one day Atmosphere WG meeting.
  • People encouraged to think about what specific training activities we can help organise.
  1. ACCESS-NRI resources:
  • Brief summary given of the resource allocation guidelines.
  • People encouraged to propose their ideas on the forum.
  • People encouraged to use remaining resources for Q2 2023 (2.5MSU in total).
  • AUS2200 is currently using ~500KSU for a reduced SST experiment for the 2022 QLD/NSW flood event.

Atmosphere WG meeting 25.07.2023 minutes

25 July 2023 (14:00-15:00)
18 participants online via Zoom
From: UNSW, CLEX, BoM, Monash, UniMelb, ACCESS-NRI

1. Admin

  • Introduction and agenda (Yi Huang).
  • Tim Raupach volunteered to take today’s meeting minutes.

2. Science presentation (Hooman Ayat)

  • Authors: Hooman Ayat, Todd Lane, Michael Reeder, Yi Huang, Scott Wales, and thanks to Holger Wolff and Dale Roberts.
  • Key drying mechanisms during frontal passages for 2019/2020 fire season.
  • Questions/discussion: differences between observed and modelled winds (Charmaine Franklin), dry air vs. dry surface/soil moisture (Claire Vincent)

3. UM research activities (Heidi Nettelbeck)

  • Collating experience within the group - please add to the research activities table on hive forum.
  • Link to table: Atmospheric modelling research activities using the UM
  • Table includes contact emails so can be in touch if there is overlap.
  • To get edit permissions you need to have spent 10 minutes looking at forum posts.

4. Combined working group meeting with forecast and prediction WG (Charmaine Franklin)

  • Forecast and prediction WG is interested in the single column model
  • Single-column models are useful for understanding parameterisations, good for idealised studies. Separates dynamics from physics. Assumes independence of columns so less relevant for high-res model.
  • Meeting will probably be organised by Martin Dix. Martin adds:
    • Single-column models also useful for debugging.
    • Working in latest version of the UM.
    • Could drive it with ERA5 similar to AUS2200.
  • Are people interested in learning more about the single-column model at NCI? Yes, there is interest.
  • Combined WG meeting will be after workshop in September.

5. ACCESS-NRI workshop update

Program (Yi Huang):

  • Two day workshop, first day will include invited keynote speakers; updates for the community.
  • Second day to focus more on science, including invited talks from individual working groups; breakout sessions.
  • Breakout sessions to be interdisciplinary.
  • For our group we need to:
    • Nominate someone to give an update on Day 1.
    • Think about who we want to give science talks on Day 2.
  • Program link:
  • Workshop to be Hybrid though in-person preferred.
  • Talk length ~15 minutes.

Training session at NRI workshop (Roger Edberg):

  • Will be opening registrations for the training shortly.
  • Multi-group effort to bring program together.
  • Two longish sessions to make up the day; strong focus on ARE services from NCI.
  • Note introduction to rose/cylc with CM2/AUS2200 examples.
  • Working to get a space with good AV/network to ensure smooth running of the training.

AUS2200 training (Yi Huang):

  • Lots of interest in being able run the high-res UM, so plan is for a half-day, more targetting training session on the Thursday.
  • Follows on from rose/cycl training and gives more detail on AUS2200 configurations, regional modelling suite.
  • In particular designed to show people how to run the regional nesting suite over a subset of the domain with the AUS2200 configuraiton.
  • Also to cover viewing model output.
  • Training for 3-4 hours in hybrid form.
  • Possibility of opening registrations to aid in planning.
  • Heidi notes there are polls on the forum to determine interest.

WG meeting at workshop (Charmaine Franklin):

  • Charmaine proposes that we take discussion on how to use our WG meeting time to the forum.

6. Admin (Yi Huang)

  • Next meeting is 2-3 pm 15 August.
  • Calendar invites are available via the forum (Heidi).

Atmosphere WG meeting 15.08.2023 minutes

15 August 2023 (14:00-15:00)
11 participants online via Zoom
From: UNSW, BoM, UniMelb, ACCESS-NRI

1. Admin (Heidi Nettelbeck)

2. Science presentation (Tim Raupach)

  • Assessing changes to hail hazard across Australia
  • In a warming climate, there is a general tendency of reduced hail frequency, but increased hail size.
  • Mainly running WRF, some AUS400. Also keen to run ACCESS models for future studies.
  • Questions/discussion:
  1. What’s WRF HAILCAST; what is needed to run it (Charmaine Franklin)?
    Only profile information needed, two versions (including offline one) are available (Tim Raupach).
  2. Particle size distribution used in microphysics schemes is developed for extratropics – not suitable for tropical conditions. Suggested that Tim test different particle size distribution using ACCESS models (Charmaine Franklin).
  3. Observations may be available in more populated regions, e.g., SE Asia (Martin Dix).
  4. AUS2220 training will use the 2022 Canberra hailstorm as a training case (Yi Huang).

3. ACCESS-NRI workshop update (Heidi Nettelbeck)

  • ACCESS-NRI Workshop / Training Day / WG Day registration reminder
  • Registration nearing capacity, closes 20.08.2023

4. Atmosphere WG day 07.09.2023 planning update (Charmaine Franklin)

  • 3 science talks on topics that haven’t been discussed much in previous WG meetings;
    Speakers: Martin Singh, Matt Woodhouse, Christian Jakob.
  • Other suggestions: lighting presentations (participation open to all to present current or future work relevant to the WG)
  • Discussion session on WG Day (45min): call for ideas on discussion topics – post ideas on the forum!
  • Action item: Heidi to email Atmosphere WG day attendees regarding their participation in lighting presentations


  • Reminder subscribe to Calendar invite to our Atmosphere WG meetings – remind colleagues to do so! (Heidi Nettelbeck)
  • Suggestions on experiments to be run as a community case (Atmosphere WG has resources to support this). Post your ideas on the forum! (Charmaine Franklin)
  • Next meeting is 7th September (9.30-5pm) at the ACCESS-NRI Workshop.

Atmosphere Working Group meeting 07.09.2023

Participants: 18 in-person, 10 online

Session 1: 9-10:30 Thursday 7 September 2023

Lightning talks

  • Charmaine Franklin - Regional atmospheric modelling activities at BoM
  • Heidi Nettelbeck - ACESS-NRI atmosphere liaison, Atmospheric model team lead
  • Belinda Roux - BoM Earth System Modelling Group - Atmosphere. Development of ACCESS A/AERegional Model Evaluation and Development (RMED)
  • Sonya Fiddes - Australian Antarctic Program Partnership, IMAS, UTAS. Using ACESS-AM2 to look at southern ocean radiation biases.
  • Kim Reid - ACCESS-S2 to enhance sub-seasonal scale precipitation. Also looking at AUS2200 to look at how temperatures in the coral sea influenced the 2022 extreme rainfall.
  • Sramana Neogi - ACCESS AMIP configuration to understand how much we can learn about climatology from short-duration runs.
  • Davide - Research Software Engineer at ACCESS-NRI. Use UM in geo-engineering. Contributed to development of Hive. Working on workflow for editing ancillary files.
  • Thi Lan Dao - PhD student UoM. Understand heavy rainfall signal under different combinations of large-scale variability. Using AUS2200 to look at heavy rainfall over Coastal Queensland.
  • Jasmeen Kaur - Working on Hive.
  • Claire Vincent - Tropical Variability, using AUS2200 for tropical rainfall experiments. Working on ACCESS-S2 and tropical modes rainfall predictabilty.
  • Scott Wales - ACCESS Ensemble modelling , Couple modelling
  • Christian Jakob - Director of W21C. Scientific Interest - convection in weather and climate
  • Yi Huang - UoM - Key Interests Cloud and Precipitation. Cloud, climate interaction, physical & dynamical processes. Uses modelling and field work. Cloud-atmosphere interactions over GBR & Antarctic sea-ice.
  • Mark Mallet - Australian Antarctic Partnership Program. Work with observations & ML. Supervising PhD student running regional UM over Southern Ocean. Observational campaigns.
  • Marty Singh - Monash. Mostly idealised modelling.
  • Matt Woodhouse - CSIRO - Resolving atmospheric composition in ACCESS
  • Xinhui Wang - Interested prospective student
  • Dale Roberts - part of CLEX CMS. AUS2200 production. Analysis of large datasets from a software level.
  • Kial Steward - ANU, primarily running laboratory experiments. Interested in idealised setups. Polar vortices, jets, stratospheric variability etc.
  • Greg Roff - BoM. ACCESS Antarctic Model. Two trials - Jan, September.

Science Talks @ Atmosphere WG meeting

1. Marty Singh: Process understanding using model hierachies - examples from convection permitting modelling

Experiments / wish list of ACCESS configurations that could support research:

  • Doubly periodic RCE
  • Tropical Channel
  • Simple Physics
  • Aqua Planet
  • Mechanism Denial (COOKIE etc)

Christian - profile of low level cooling and upper level heating - looks like stratiform profile.
Marty - this is part of the story, but do you get statiform profiles due to the heating profile, or the other way around?
Kial - Question about Double Periodic RCE
Marty - Convective heating balances radiative heating. Use RCE to examine problems around moist convection. Easy to simulate in both models. Also used to study convective aggregation. Experiments into why this happens and what the processes are - led to ways of looking at the real atmosphere.
Charmaine - UM sub-km scale simulates convection too early and too shallow. Could idealised model help understand what is going on.
Marty - Idealised modelling allows you to isolate processes
Scott - UM does support some idealised modelling configurations. There is some documentation, not sure how up-to-date it is. Aquaplanets are not that hard.
Christian - Strategy - we need a plan to incentivise people to develop these configs. Idealised model versions in the UK?
Scott - A lot of material exists, but people may not know about it.
Christian - nudged runs are useful semi-idealised config that would be useful for people to use.
Sonya - nudged runs need full ERA5 model levels - a lot of data is required. A full set of ERA5 model levels would be really useful.
Christian - nudging can maybe be done usig model levels too?
Kial - ERA5 project on NCI - pressure levels.
Marty - Is there an imbalance between storage versus compute at NCI? At the moment, a lot more compute hours than storage.
Christian - A lot of storage is from LEIF grants.
Kial - Can we design better ways of using /scratch - eg download and delete.
Sonya - ERA5 model levels 12.5GB per day

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Science talks @ Atmosphere WG meeting


2. Christian Jacob ARC COE The Weather of the 21st Century

  • “21st Century Weather” what they want to be called
  • We know the Earth will get warmer, extremes will get more extreme
  • But location specific information on extremes is less certain
  • People want localised information to make decisions - need to know about future weather rather than global mean states
  • Weather change is a grand challenge of climate science
  • The climate is made up of weather, so we need to understand the weather in order to understand the climate. Weather is blobby and complex
  • Climate change will make us more weather dependent (e.g. renewable energy)
  • What happens to clouds or winds in the future will affect our future energy generation and climate change adaptation
  • Centre will have 3 major areas: 1) Circulation Change (Weather Systems, Climate Variability, Climate Change). 2) Weather change (Weather Systems, Weather Resources, High-impact Events). 3) Modelling (hi-res coupled modelling)
  • Goal by 2026 global 25km coupled model, regional Aust. domain 1km
  • By 2028 large domain 3km eg Indian and Pacific Ocean and Australia
  • Km-scale global models by 2030
  • Strong collaboration with the NRI especially through the CMS team
  • Often, climate models break at high resolution. Re-tuning necessary.
  • Difference in future ENSO projections with different resolutions
  • Decline in global atmospheric modelling in Australia but lots of work in regional modelling
  • Transition to new version of the UM will occur during lifetime of the centre (unless delayed - highly likely)


Sonya Fiddes - global ACCESS model is old and is missing updates around microphysics. Hard to include global ACCESS model changes in the new UM versions, which is why they use the regional model which is more up to date.

Rachel Isphording - High res models needs high res obs for evaluation. Are there discussions with the BoM on this? BoM is a partner.

Yi Huang - What is the COE going to do differently from other international centres doing high resolution modelling? Going to collab and use resources with them. But focus is on understanding Australian weather. Goal is underlying science not predictions or projections.

AUS2200 is the starting point for the new centre and high resolution modelling.

Claire Vincent - Nocturnal jets important for wind energy generation and models currently do a poor job of simulating these. Need for easily relocatable (domain) high resolution model in research sector not just the BoM.

Heidi - how is that different from AUS2200? Relocatable aspect is the key difference

Charmaine Franklin - NRI needs to move away from ‘configuration’ thinking

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Science talks @ Atmosphere WG meeting


3. Matt Woodhouse

Overview of ACCESS composition-climate modelling capabilities

  • Modelling, fieldwork, lab measurements - the three-legged stool of atmospheric chemistry
  • Land emits lots of gas that interacts with the atmosphere. [Chemical] composition connects different parts of the earth system.
  • Lots of stuff (that emits gases) floating around the Southern Ocean and Antarctica. Connected coupled system.
  • Capability starts with people - small group of atmospheric composition modelling in Australia. Mostly at CSIRO + UTAS
  • Composition in ACCESS. UKCA is the framework for chemistry composition. Advection, emission, deposition. Handles chemistry schemes
  • Lots of advected tracers makes it very expensive
  • GLOMAP-mode is the aerosol scheme (included in ACCESS-CM2, ocean optional, can nudge to the ERAs)
  • Coupled to cloud and radiation schemes
  • GLOMAP is a big improvement but also why ACCESS became much more expensive. GLOMAP explicitly represents aerosol size distribution. Necessary for cloud-aerosol feedbacks/decent radiative forcing
  • ACCESS-CM2-Chem includes full chemistry (tropospheric and stratospheric). Simulates ozone hole.
  • NRI has new visualisation specialist - Owen Kaluza. Valuable outreach tool.
  • Work on stratospheric ozone. Ozone hole better simulated in later ACCESS versions (with interactive chemistry). Ozone affects SAM which is important for Australian weather.
  • CM2-Chem 1.9x more expensive than CM2
  • UM nesting suite over Great Barrier Reef - reef restoration and adaptation program partnership
  • Assessing how the GBR is responding to coral bleaching and potential interventions
  • Southern Ocean simulations planned (Sonya Fiddes)
  • Past success: missing source of marine aerosol, addressing bias in ozone deposition over the ocean, Lightning NOx parameterisation, biases in stratospheric ozone
  • Make sure improvements are fed back to model development and included in UKESM/2
  • Future applications: transition to hydrogen economy and consequences (future CMIP input), Southern Ocean warm bias, Ozone hole recovery, stratospheric impacts from volcanoes (next Pinatubo, Hunga Tonga)
  • Big Questions: To chem or not to chem? Does Australia want/need and Earth System Model? Do we have compute/storage?


Charmaine - focus is on marine aerosols, what about land? This is due to focus on Southern Ocean. Limited by number of people in Australia working on this to cover land too.

Can get rid of some things in GLOMAP to make it cheaper but need to evaluate new configurations. “GLOMAP-lite”

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Breakout Discussion @ Atmosphere WG meeting


  • Matt W - Lots of things we may want but how much capacity does the NRI have?
  • Heidi N - NRI has 4 people in the atmosphere team
  • The NRI needs input from the community on what is needed including around documentation and tools. Hive is useful for documentation and training- a starting platform.
  • What the NRI supports needs to pass through the Scientific Advisory Committee and Board.
  • Matt W- could write instructions of nudging. Need for processing ERA5 data for nudging/input data.
  • Heidi - use the forum for raising issues
  • Claire-challenge with prioritising tasks. Procedure necessary. AUS2200 hackathon led to Python scripts in various states on accessing and plotting data etc. Could be developed for future AUS2200 users as tutorials. Guides for accessing AUS2200 data in an efficient way would be helpful.
  • Yi - propose wishlist on the forum. Need community input to prioritise resources.
  • Atmosphere WG meeting has monthly meetings - open to feedback on these including around scheduling.
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Atmosphere WG meeting minutes, 19/10/23

13 participants, online via zoom
BoM fire alarm / drill delayed some from joining initially

Andy Hogg, NRI update, and framing for reference datasets
NRI will receive additional $9.6m over next four years. Used for:
• Contribution to CMIP7 development
• Contribution to LFRIC
• Machine learning
• compute and storage
Reference datasets:
• NRI internal meeting in 1.5 weeks to discuss proposed reference datasets. Then presentation to NRI SAC. Then NCI.
• ~2 PB across the NRI. Some may be used to adopt datasets currently supported by NCI, LIEF.

Datasets discussion
SST / SI ancillary files, Sonya Fiddes
• udpated AMIP inputs for use in AM2
• Have been used by Martin
• 1870 to 2019ish, later years provided by Sonya
• Need support to generate updated files. Martin: good candidate for NRI support

Obs4MIP, Martin Dix and Sonya Fiddes
• clouds, radiation, precip
• already on ESGF, but not on NCI
• not all variables needed

AUS2200, Yi Huang
• mix of input data, and observations datasets
• Reanalysis data
◦ EAR5
◦ BARRA(2?)
• BoM data
◦ Radar
◦ AWS, hourly?
• Satellite precip data
• Global radiosonde data
• Aircraft data: AMDAR
• time periods for datasets?
◦ Some simulations back to 2013
◦ plenty of use outside of Aus2200
• Himawari. Already available? RR5?

ERA5 for nudging
• Matt to write up
• need for NRI support to process data into appropriate format
• ERA40 / ERA-int already available

Ancillary file generation
• which models? Some already supported

NRI meeting in about 1.5 weeks to prioritise, need to detail well before then

Aus2200 proposal, Yi Huang, 256 kSU, 4.5 TB storage
No other requests at the moment

Future presentation suggestions
Martin, single column model
CMIP7 update

Science talk
Chun-Hsu Su “Introduction of BARRA2 for ACCESS-NRI Atmosphere WG”
Presentation slides:
191023_BARRA_preso_AtmosWG.pdf (1.4 MB)
Meeting recording: to be uploaded soon.

Next meeting
29.11.2023 at 14:00 (Wednesday)
Interest in a talk by Martin Dix on the Single Column Model (SCM) or combined meeting with Forecasting and Prediction WG?

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Atmos WG meeting minutes
30 Nov 2023

19 participants on zoom

Compute and storage update, Claire Carouge
NRI Merit Allocation Scheme
• guidelines published, assessment criteria
ACCESS-NRI Merit Allocation Guidelines - ACCESS-NRI
• request templates being prepared
• Proposals requested in 2024 Q1
• Will start from 2024 Q2. In mean time compute is available
• all WGs will get 100 TB storage
• size of resource is expected to grow over time
Reference datasets
• currently determining priorities for storage; finalising plan
• more news at end of this year, or early next

Aus2200 support update, Andy Hogg
working out where NRI can add value, where are priorities?
Welcome to Chermelle, who will be working on Aus2200 at NRI
priorities, discussion
• upgrade suite to RAL3.2
• create / improve tutorial (reduce barrier to entry)
• catalogue runs that have already been completed; make output available
• address post-processing challenges; common analysis tools?
• Document creation of ancillary files etc
• Yi: would be good to have a supported suite, NRI maintained? Discussion around what is supported re: resolutions, moving domains, physics packages
• query from Chermelle: how should outputs be formatted? BARRA style? Or UM style? What should first-time user be presented with? Clear need for documentation about how to change output.
• Dale: AUS2200 - A complete guide — CLEX CMS Wiki
◦ documentation growing steadily

Comparing the fire weather dynamics during the high-impact bushfire events in Australia using high-resolution regiognal simulations, Hooman Ayat
• science presentation: slides??

Reflections on Atmosphere WG’s first year
• challenging to get people involved; where are ECRs?!
• See this post on forum to add ideas/suggestions around increasing engagement

Next meeting
In early Feb, conscious of the AMOS conference in Canberra


Atmosphere WG Meeting 22.02.2024 minutes
22 Feb 2024
15 participants on Zoom

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!

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.


    • 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)