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