climateprediction.net (CPDN) is a research project that uses Internet-connected computers to do research in climate science. You can participate by downloading and running a free program on your computer.

CPDN is based at the University of Oxford.

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CPDN project downtime from Tuesday 3:30pm (UK time)
I hope you all had a good festive break. Just to let you know that the CPDN project will be going offline from tomorrow (Tuesday) at 3:30pm (UK time). This is in order to conduct some essential backend maintenance work. It is expected that this work may take several days to complete. Thank you in advance for your patience.

Update: this work has now been completed.
5 Jan 2026, 12:44:48 UTC · Discuss

Project PAREST - New batches
Project description: Exploring the role of circulation biases in limiting seasonal predictability

Recent work has shown that operational seasonal forecast models have deficient responses to predictable forcing (e.g. ENSO) on seasonal timescales. These appear to be linked to persistent circulation biases in the atmosphere – similar issues are also found in coupled climate models used to make projections on longer timescales. In this OpenIFS@home project we will create perturbed model parameter ensembles to generate a range of different atmospheric states and explore which atmospheric circulation biases act to limit circulation signals in the extratropics.

This project is led by scientists at the University of Reading, Meteorology Department.

For more details of the batches, please see the CPDN Forums.

Technical details:
App: OpenIFS 43r3 Multi-core Linear grid Tl319L91
Linux only.
4 physical cores required.
Expected task run-time: 2-7 days depending on hardware and boinc client settings.
Checkpoint files for this app are 4.5Gb.

This application has a peak memory usage of 26Gb. Only one task will be sent to each host at a time.

To contribute to this project you must enable the 'OpenIFS Tl319' option on the CPDN Project Preferences page on your CPDN web account and have enough free resource in the boinc client for the task.

Please ensure you have 'Leave non-GPU applications in memory whilst suspended' enabled. This prevents a restart from checkpoint files which is costly.

Please raise any issues/questions on our forums.
10 Nov 2025, 13:44:06 UTC · Discuss

Project DEPICT-SNOW: New batches
Project description:
While global mean snowfall is projected to decrease due to global warming, it remains unclear how the extreme snowfall will respond to global warming. This UK Research and Innovaton (UKRI) funded MSCA project aims to study the response of extreme snowfall in the upcoming decades to future global warming. The project will run three large-ensemble seasonal weather forecast experiments including one control and two sensitivity experiments to accomplish the project objectives. It is anticipated that the results will significantly improve our understanding of future extreme snowfall change.

Technical details:
App: OpenIFS 43r3 Multi-core Linear grid Tl319L91
Linux only.
4 physical cores required (not user changeable).
Expected task run-time: 4-6 days depending on hardware.
Checkpoint files for this app are 4.5Gb.
Each set of model output files is 22Mb.

Please note to contribute to this batch you must enable the 'OpenIFS Tl319' option on the CPDN Project Preferences page on your CPDN web account and have enough free resource in the boinc client for the task.

Please also ensure you have 'Leave non-GPU applications in memory whilst suspended' enabled. This prevents a restart from checkpoint files which is costly.

This application has a peak memory usage of 26Gb. Only one task will be sent to each host at a time.

Please raise any issues/questions on our forums.
13 Aug 2025, 15:25:43 UTC · Discuss

Release of a new multicore configuration of the OpenIFS application
A new multicore configuration of the OpenIFS application, known as Tl319, is being released by CPDN. This is the first time CPDN has deployed a multicore app and we believe the first time BOINC has been used for large memory applications.

As this configuration has a peak total memory requirement of 26Gb, we have introduced a new option under the 'CPDN Project Preferences' found in 'Your account' which must be selected in order to receive workunits using this configuration. Please ensure your machine has enough resources assigned to the boinc client even if this option is selected. CPDN will soon release batches for several projects using this configuration. For further information and discussion on this new app and batches, please use the forums.
22 Jul 2025, 10:29:24 UTC · Discuss

Statement on the recent disruption to the climateprediction.net project
We profoundly apologise for the disruption of the last few days to the project. We apologise for any lost workunits you have had during this period. Any workunits that were aborted during this period you will receive full credit for. This period represents an attempted rebranding of the project. Any future change on this scale including to the name of the project to be more representative of the research supported will be completed following significant testing to reduce impact. For the foreseeable future we will continue to use the name 'climateprediction.net'. Please use the project forum if you have any questions.
18 Sep 2024, 15:51:08 UTC · Discuss

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