Hi all,
There will be no CMWG meeting this month - see you in November!
Thanks,
Mike
Hi everyone,
Please be advised Dr Eric Larour (JPL) will be giving a talk as part of the ACCESS-NRI Cryosphere Modelling Working Group meeting next Wednesday 13th Nov from 9-10 am AEST.
Details as follows:
Title : Modeling negative feedback in sea-level change using the Ice Sheet and Sea-Level System Model
Abstract: Sea-level change contributed by polar ice sheets depends on a geodetically compliant redistribution of ice and water masses around the world. The solid-Earth response to a change in ice mass also induces uplift of the bedrock close to the grounding line, which can represent a significant negative feedback; stabilizing grounding line retreat or at least delaying it. Here, we use the Ice Sheet and Sea Level System Model to understand the sensitivity of this negative feedback to different model parameterizations, including mesh resolution, temporal resolution, as well as rheology of the solid-Earth. Our results point at controls on grounding line retreat that are more significant than previously anticipated and showcase the impact of a geodetically compliant system such as ISSM in understanding complex interactions between different components of the sea-level system.
Zoom: Launch Meeting - Zoom
Meeting ID: 869 4272 8844
Password: 687542
Please feel free to forward to interested colleagues and hope to see you there!
Dear all,
We’re putting together the schedule for the 2025 CMWG meetings. This year we’re aiming to hear from a more diverse bunch of ice sheet modellers and cryosphere scientists. Ping us if you have any ideas for speakers!
And in the meantime, below are the meeting dates for your calendars. Time TBC depending on the time zone of the speaker, but we’ll give you at least one month’s notice.
Jan - no meeting
26 Feb (Ralf Greve)
19 March (Nick Golledge)
16 April (Speaker TBC)
21 May (Speaker TBC)
18 June (Speaker TBC)
16 July (Speaker TBC)
5 Aug (Qingyao Lai)
Sept - no meeting (ACCESS workshop)
Oct (Speaker TBC)
Nov (Speaker TBC)
Dec - no meeting
Looking forward to seeing you on the 26 Feb!
Cheerio,
Felicity
1 Like
Hi folks, this seminar on Thurs may be of interest:
1 Like
Hi everyone,
Prof Ralf Greve from Hokkaido University’s Institute of Low
Temperature Science will be giving a talk as part of the ACCESS-NRI Cryosphere Modelling Working Group meeting next Wednesday 26 Feb from 11:30 am -12 pm Canberra/Sydney/Melbourne/Hobart time.
Details as follows:
Title: Towards ISMIP7: Spinning up the Greenland ice sheet using a transient,
multi-phase method
Abstract: Simulating the future ice-sheet contribution to sea-level rise requires
initial conditions of the recent 3D dynamic/thermodynamic state of the
ice sheet in question. Since observational data are limited, numerical
tools are required to obtain these initial conditions, which can be
classified into assimilation methods and spin-up methods. Here, we
discuss a multi-phase spin-up for the Greenland ice sheet, simulated
with the model SICOPOLIS. It consists of the following steps: (1) a
100-ka steady-state calibration phase that includes preliminary tuning
of the basal sliding coefficient, (2) a freely evolving glacial phase
from the Eemian interglacial until the Last Glacial Maximum (LGM), (3) a
deglaciation phase from the LGM until the early Holocene, (4) a final
Holocene phase from the early Holocene until today that includes
fine-tuning of basal sliding and topography-nudging with the observed
topography as a target. This produces a present-day ice sheet that
includes the thermal, sea-level, and glacial-isostatic-adjustment
signals. We use the initialized ice sheet to carry out selected
future-climate test simulations.
Bio: Ralf Greve is a professor at Hokkaido University’s Institute of Low
Temperature Science in Sapporo, Japan. A physicist by training, he works
mainly on the dynamics and thermodynamics of the Earth’s ice sheets by
means of numerical modelling. Ralf Greve is the author/co-author of more
than 100 peer-reviewed scientific papers and two textbooks on ice
dynamics and continuum mechanics, serves as an Associate Chief Editor
for the Journal of Glaciology and maintains the open-source ice sheet
model SICOPOLIS.
Zoom: Launch Meeting - Zoom
Meeting ID: 847 3427 5772
Password: 643764
Please feel free to forward to interested colleagues and hope to see you there!
Cheers,
Chen
Thanks once again to Ralf Greve for a really interesting talk!
For those of you who missed Ralf’s presentation, or if you would like to watch it again - please find the link to the cloud recording below:
Link: CMWG February 2025 Seminar - Ralf Greve
Passcode: @w089?y6
We hope to see you all at the next CMWG meeting on Wednesday 19 March where we will be hearing from Nick Golledge - and remember to watch this page for any updates!
Thanks,
Chen, Felicity, Lenneke and Mike
Hi everyone!
To gather suggestions and ideas for potential training topics for the 2025 ACCESS-NRI Community Workshop (in Melbourne from 8-12 Sept.), the ACCESS-NRI training team has created a poll 
on the ACCESS-Hive Forum.
We would love to hear feedback from all community members about the training sessions they’d like to see this year!
There are 3 main ways to add or vote on the suggestions (similar to StackOverflow):
1. 
Choose up to 10 options from the existing options on the poll.
2. 
Add a new suggestion by hitting the 
button.
3. ↑ You can also upvote any suggestion found in the replies.
We are looking forward to meeting you at the working group meetings as well 
.
Please note that the poll will close on 2025-03-30T13:00:00Z.
Thanks heaps!
Jasmeen Kaur
ACCESS-NRI User Training Team
1 Like
Hi all,
Our next CMWG meeting will be held on 19th March from 10-11 am Melbourne/Canberra/Hobart time (AEDT). The agenda is as follows:
- Seminar by Prof Nick Golledge (Victoria University, Wellington; see below), 10.00-10.50
- Other business
Nick Golledge will be speaking to us on “Warming climates drive abrupt ice sheet regime shifts”.
Overview: The way that ice sheets respond to climate is most commonly investigated through the lens of changes in mass or ice volume. Yet ice sheets exhibit vastly different behavioural regimes under different climates, and so far these regime types have been largely unexplored. In this talk I will present a suite of ice sheet simulations that illustrate different ice sheet regime types, how they arise, and how they switch abruptly from one type to another.
Zoom link
Meeting ID: 847 3427 5772
Password: 643764
Looking forward to seeing you all there!
Felicity
1 Like
We’d like to thank Nick Golledge for presenting such a great talk this month entitled “Warming climates drive abrupt ice sheet regime shifts”.
For those of you who missed Nick’s presentation, or if you would like to watch it again - please find the link to the cloud recording below:
Link: CMWG March 2025 Seminar - Nick Golledge
Passcode: BG9dL.?l
We hope to see you all at the next CMWG meeting on Wednesday 16 April (time TBC) - and remember to watch this page for any updates!
Thanks,
Chen, Felicity, Lenneke and Mike
1 Like
Dear all,
Our CMWG meeting is cancelled today. Apologies for late notice!
Cheers,
Felicity
Hi all,
Our next CMWG meeting will be held on 21st May from 4:15 - 5 pm Melbourne/Canberra/Hobart time (AEDT). The agenda is as follows:
- Updates from the CMWG, 4:15 - 4:30 pm
- Seminar by Ann Kristin Klose (see below), 4:30-5 pm
Title: Tipping dynamics in the Earth system: From transient to committed and irreversible changes
Abstract: Positive feedbacks at play in several parts of the Earth system may drive nonlinear, self-amplifying and potentially irreversible changes upon crossing a critical threshold (tipping point). While often described in terms of simple bistable systems, recent research has shown that such tipping dynamics may be far more complex in space and time.
Using the Antarctic Ice Sheet as an example, we explore the diverse set of complex trajectories associated with tipping dynamics in the Earth system, spanning multiple timescales. In particular, based on process-based ice-sheet modelling covering a wide range of uncertainties combined with complex systems theory, we systematically assess the transient , committed and irreversible Antarctic ice loss in response to warming projected over the next centuries.
We show that the multi-millennial impacts of the projected warming on the Antarctic Ice Sheet may be profound: The unprecedented rates of warming, much faster than the long response time of the Antarctic Ice Sheet, lead to a substantial sea-level commitment, which may be triggered over the next decades and centuries already under a lower-emission pathway. What is more, we find that such projected large-scale ice-sheet changes could be long-lasting, if not irreversible, even with a reduction in warming in a peak-and-decline trajectory, depending on the magnitude and duration of peak warming.
Bio: Ann Kristin Klose is a PhD student in Climate Physics at the University of Potsdam and the Potsdam Institute for Climate Impact Research (PIK). Her PhD project, embedded in the EU-H2020 project PROTECT, aims at understanding the Antarctic Ice Sheet as a complex system. Ann Kristin studied Environmental Sciences and Modelling at the University of Oldenburg (Germany) and at the University of Bergen (Norway), and completed a research stay at the British Antarctic Survey (UK) during her PhD.
Please note the change of Zoom details for the meeting this month below:
Zoom link
Meeting ID: 838 2271 5274
Password: 643764
See you all there next Wednesday!
Chen
1 Like
Hi all,
Just reminder that this month’s CMWG meeting is on today from 4:15pm (Melbourne, Canberra, Hobart time) with our invited speaker Ann Kristin Klose presenting from 4:30pm onwards (^^ full details above).
Hope to see you all there!
Thank you to Ann Kristin Klose for a fantastic presentation this month entitled “Tipping dynamics in the Earth system: From transient to committed and irreversible changes.”
For anyone who missed the talk, or for those who would like to watch it again, please find the Zoom cloud recording details below:
Link: CMWG May 2025 Seminar - Ann Kristin Klose
Passcode: 5Py.TeL6
We hope to see you all at the next CMWG meeting on Wednesday 18 June (time TBC) - and remember to watch this page for any updates!
Thanks,
Chen, Felicity, Lenneke and Mike
Hello CMWG,
Just a reminder that abstract submission for the 2025 ACCESS Community Workshop are closing at COB Sunday 15 June - that is in 3 days!
Submissions will have the ability to nominate a preference for either a talk or a poster slot and it would be fantastic to see a strong Cryosphere-related science presence this year! Additionally, any CMWG-related posters will also have the opportunity to be displayed at the Cryosphere Community Working Group Meeting / Science Day on Friday 12 September.
This is a safe space and submissions from everyone in the Cryosphere community are welcome - especially those from students, Early Career Researchers (ECRs) and those underrepresented in the research community. We know great science is being done and we’d love for you to share it with the community!
Submit your abstract here before COB Sunday 15 June.
In the submission form, you will be asked for a title and a 200-word (max) abstract. Please follow these guidelines to learn more about creating your abstract.
Guidelines for oral presentations and posters can be found here.
KEY DATES:
- 16 June: Registrations for the ACCESS Community Workshop and ACCESS Training Day open
- 15 June: Abstract Submission closes
- 15 July: Final Program available
- 8-12 September: 2025 ACCESS Community Workshop
For all workshop details, see the 2025 ACCESS Community Workshop page.
Looking forward to seeing you all at the Workshop!
CMWG Co-Chairs and the Program Committee, 2025 ACCESS Community Workshop
Hi all,
Our next CMWG meeting will be held this Wednesday 18th June from 4:00-5 pm Melbourne/Canberra/Hobart time (AEST). The agenda is as follows:
- Updates from the CMWG, 4:00 - 4:15 pm
- Seminar by Dr Shivani Ehrenfeucht 4:15-5 pm
Title: Incorporating subglacial hydrology into sea level rise projections: variations in model configuration
Brief overview: This talk will cover ice sheet-subglacial hydrology coupling for both Greenland and Antarctica, including projections for the Petermann (Greenland) and Thwaites (Antarctica) Glaciers. Some key considerations around ice sheet-subglacial hydrology coupling will be discussed, as well as some of the parameters / modelling choices that are most impactful.
The Zoom details are as follows:
Zoom link
Meeting ID: 847 3427 5772
Password: 643764
Looking forward to seeing you on Wednesday.
Cheerio,
Felicity
Just a reminder that the corrected Zoom link for today’s meeting is as above:
The Zoom details are as follows:
Zoom link
Meeting ID: 847 3427 5772
Password: 643764
– From the ACCESS Community workshop committee –
Are you a student or Early Career Researcher interested in climate and weather science and modelling?
Join us at the 2025 ACCESS Community Workshop! Connect with other researchers using the same models and tools as you and discover new software tools that could transform your research!
The ACCESS Community Workshop will take place 8-12 September 2025 in Melbourne and we are welcoming students and Early Career Researchers (ECRs) to contribute and attend. The Workshop takes place over 4 days: 2 days of presentations, 1 training day, and 1 day devoted to specific domain working groups (Land Surface, Machine learning for Climate and Weather, Atmosphere, Ocean and Sea ice, Cryosphere and Earth System modeling). Scholarships are available to support ECR/student travel and attendance via the abstract submission.
Who is the ACCESS community?
If your work uses ACCESS models - be that developing models, running models, or analysing model output, then you are part of the ACCESS community! We also welcome researchers using other climate models or considering using ACCESS models to be involved.
This event is hosted by Australia’s climate simulator (ACCESS-NRI), which provides the software engineering expertise to create open-source models, data and tools in collaboration with Australian research communities.
What’s in it for you?
- Learn about Australia’s ACCESS climate models and tools you might use within your own research
- Learn about the broad range of exciting science being done with ACCESS models
- Connect with other climate and weather researchers who get it - who encounter similar technical hurdles and triumphs in their research
- Attend the dedicated student/ECR social event where you can swap coding stories, make new friends, or simply unwind with people who understand what you’re working on
- Talk to ACCESS-NRI staff – the research software engineers who co-develop, maintain and improve the software infrastructure – in person, so you know who to contact for modelling help in the future
- Attend hands-on training opportunities on the use of ACCESS models and outputs, as well as other skills including handling large datasets, model evaluation tools, machine learning in climate models, and advanced Git and GitHub – all skills valued by research institutions, industry, and government agencies
- Present your work - if you have a talk or poster from a previous occasion, bring it along to expose your research to a wider audience
Ready to advance your climate and weather research? Don’t miss this opportunity and apply now!
Visit https://www.access-nri.org.au/access-community-workshop-2025/ to submit your abstract and apply for a scholarship.
Extended abstract sumission dates:
- Abstract submissions for oral presentations close 22 June Submit an abstract
- Poster submissions (with 1-minute lightning talks) close 20 July.
- Scholarships available for students and ECRs