Software presented in "CYCLIM: a semi-automated cycle counting tool for generating age models and palaeoclimate reconstructions"

The software presented accompanies the paper "CYCLIM: a semi-automated cycle counting tool for generating age models and palaeoclimate reconstructions" (Forman & Baldini, 2025, https://doi.org/10.5194/cp-21-2485-2025). The tool uses a matched filtering approach to automate cycle counting but allows the user to amend the output. Age uncertainty is quantified in the form of algorithmic uncertainty and can be propagated to proxy uncertainty.  

Usage

Please see the attached PDF file for an example of the GUI interface.

To get started, open and run the Python script. Instructions are included within both the Python file and the application itself. 

Dependencies

CYCLIM requires the following Python packages (the app will notify you if any are missing):

• numpy; >=1.26.4,<2.3.0
• pandas; >=2.2.3,<3.0
• matplotlib; >=3.10.0,<3.11
• scipy; >=1.13.0,<2.0
• Pillow; >=10.4.0,<11.0
• pwlf; >=2.2.1,<3.0

If any dependencies are missing, please install them and re-run the script.

Examples Used in the Paper

For the data used in the example runs, please see: 

• Kuhnert, H., Pätzold, J., Hatcher, B., Wyrwoll, K.-H., Eisenhauer, A., Collins, L. B., Zhu, Z. R., and Wefer, G.: A 200-year coral stable oxygen isotope record from a high-latitude reef off Western Australia, Coral Reefs, Springer-Verlag, 1–12 pp., https://doi.org/10.1007/s003380050147, 1999.
  • Data available at: https://www.ncei.noaa.gov/access/paleo-search/study/1856
• Warken, S. F., Fohlmeister, J., Schröder-Ritzrau, A., Constantin, S., Spötl, C., Gerdes, A., Esper, J., Frank, N., Arps, J., Terente, M., Riechelmann, D. F. C., Mangini, A., and Scholz, D.: Reconstruction of late Holocene autumn/winter precipitation variability in SW Romania from a high-resolution speleothem trace element record, Earth Planet Sci Lett, 499, 122–133, https://doi.org/10.1016/j.epsl.2018.07.027, 2018.
  • Data available at: https://doi.org/10.1594/PANGAEA.909989
• Forman, E. C. G., Baldini, J. U. L., Jamieson, R. A., Lechleitner, F. A., Walczak, I. W., Nita, D. C., Smith, S. R., Richards, D. A., Baldini, L. M., McIntyre, C., Müller, W., and Peters, A. J.: The Gulf Stream moved northward at the end of the Little Ice Age, Commun Earth Environ, 6, https://doi.org/10.1038/s43247-025-02446-3, 2025.
  • Data available at: https://www.ncei.noaa.gov/access/paleo-search/study/42999