About
My research
I'm investigating (warm-)cloud microphysics and its implementation in climate models. In particular, I'm finding out what we can learn from the Superdroplet Method (SDM; Shima et al. 2009) about rain formation in tropical shallow cumulus.
My focus is on deciphering if our fundamental theories of cloud microphysics, as modelled by SDM, can explain the macrophysical properties of precipitation and shallow cumulus cloud patterns — i.e. properties which we can actually observe "in the field". To do this I created a SDM called Cleo, which I am currently using in idealised simulations to test the convergence properties of SDM (with increasing number of superdroplets, for example), as well as Cleo's computational efficiency.
If you are interested in my research, want to conduct a project, or collaborate with me, please feel free to contact me!
Cleo
Cleo — new superdroplet model for high computational performance
Cleo is an open-source superdroplet model in C++/Kokkos designed to run efficiently on high-performance computers. It's flexibly designed to model all the major warm-cloud microphysical processes — condensation/evaporation, droplet collisions and their motion — and is easily extendable beyond warm clouds.
You can find out more about Cleo from its website and model description papers.
yoctoyotta1024 / CLEO
github.com/yoctoyotta1024/CLEO →Lagrangian super-droplet model for warm-cloud microphysics, written in C++ with Kokkos for performance-portable HPC. Open source under BSD-3-Clause; documentation and build instructions at yoctoyotta1024.github.io/CLEO.
Bayley, C. J. A., Naumann, A. K., Poydenot, F., Vogel, R., Stevens, B., Shima, S.-I. — Cleo: the numerical methods of a new superdroplet model including a droplet breakup algorithm (v0.52.0)
Bayley, C. J. A., Kölling, T., Naumann, A. K., Vogel, R., Stevens, B. — Cleo: the fundamental design of a new superdroplet model for high computational performance (v0.39.0)
Publications
Selected papers & preprints
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In prep.
Bayley, C. J. A., Ware, E., Arabas, S. — SDM as a Numerical Benchmark for Warm-Rain Processes?
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In prep.
Windmiller, J., Groß, S., Stevens, B., Ament, F., Mayer, B., Wendisch, M., Wu, Y., et al. incl. Bayley, C. J. A. — PERCUSION's contribution to ORCESTRA
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2026
Bayley, C. J. A. & Niebaum, N. (equal contribution), Poydenot, F., Naumann, A. K., Sarkar, M., Vogel, R. — Constraining Rain Evaporation from Shallow Clouds in the Trades using an Observation-Based Superdroplet Model
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2026
Bayley, C. J. A., Naumann, A. K., Poydenot, F., Vogel, R., Stevens, B., Shima, S.-I. — Cleo: the numerical methods of a new superdroplet model including a droplet breakup algorithm (v0.52.0)
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2026
Bayley, C. J. A., Kölling, T., Naumann, A. K., Vogel, R., Stevens, B. — Cleo: the fundamental design of a new superdroplet model for high computational performance (v0.39.0)
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2026
Bayley, C. J. A. — Design and First Applications of Cleo, a Flexible Superdroplet Model for Warm-Cloud Physics on High-Performance Computers
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2025
Segura, H., Bayley, C. J. A., et al. — A single tropical rainbelt in global storm-resolving models: the role of surface heat fluxes over the warm pool
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2023
Kasoar, M., Bayley, C. J. A., Wells, C., Voulgarakis, A. — A Negative Feedback on El Niño Events Caused by Extreme Fire Activity in Equatorial Asia
Full list and citation metrics on Google Scholar · verified record on ORCID 0000-0002-4540-9382
Academic Record
Positions & education
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2026 — presentPostdoctoral Researcher — Susanne Hasselmann FellowshipMax Planck Institute for Meteorology, Climate Physics Department
- Co-supervising a PhD student
- Awarded funding to hire a research software engineer as part of the PHEONIX European Lighthouse code project
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2022 — 2026PhD, Climate Physics — summa cum laudeMax Planck Institute for Meteorology (oral defence: magna cum laude, 1.0)
- Created Cleo, a C++/Kokkos implementation of the super-droplet method, from scratch
- Proposed and led two NatESM sprint projects; working with two research software engineers for a total of one year
- Radar and radiometer operator aboard HALO during the ORCESTRA field campaign
- Co-supervised a Master's student to a co-first-author publication
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2017 — 2021BA & MSc, Natural Sciences (Physics) — First Class HonoursUniversity of Cambridge, Robinson College
- Microsoft Research Prize for Master's project (91.6%)
- Mathers Prize in Physical Natural Sciences
- College Scholarship and College Prize
Resources
Tools & tutorials I've found useful
An eclectic selection of references for new students and research software engineers
Coding resources
- PythonPython Crash Course: A Hands-On, Project-Based Introduction to Programming — book by Eric Matthes
- C++Effective Modern C++ — book by Scott Meyers; and matt.sh/howto-c by Matt Stancliff
- JuliaIntroduction to Julia (talk) by George Datseris
- Condadocs.conda.io — see the very useful cheatsheet
- Git & GitHubSoftware Carpentry: Git Novice; and this DKRZ Tech Talk by Wilton Loch, Pradipta Samanta and Georgiana Mania
- Markdownw3schools: Markdown introduction
Climate research tools
Contact
Get in touch
Happy to hear from prospective collaborators, students, or others generally interested!
Pronouns: she/her