Articles | Volume 44, issue 1
https://doi.org/10.5194/angeo-44-287-2026
https://doi.org/10.5194/angeo-44-287-2026
Regular paper
 | 
23 Apr 2026
Regular paper |  | 23 Apr 2026

Effect of a non-hydrostatic core-mantle boundary on the nutations and Length-of-day of Mars

Marta Folgueira López, Véronique Dehant, Mihaela Puica, and Tim Van Hoolst

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Cited articles

Baland, R. M., Yseboodt, M., Le Maistre, S., Rivoldini, A., Van Hoolst, T., and Dehant, V.: The precession and nutations of a rigid Mars, Celest. Mech. Dyn. Astr., 132, 47, https://doi.org/10.1007/s10569-020-09986-0, 2020. 
Broquet, A., Plesa, A.-C., Klemann, V., Root, B. C., Genova, A., Wieczorek, M. A., Knapmeyer, M., Andrews-Hanna, J. C., and Breuer, D.: Glacial isostatic adjustment reveals Mars's interior viscosity structure, Nature, 639, 109–113, https://doi.org/10.1038/s41586-024-08565-9, 2025. 
Buffett, B. A., Mathews, P. M., and Herring, T. A.: Modeling of nutation and precession: Effects of electromagnetic coupling, J. Geophys. Res., 107, https://doi.org/10.1029/2000JB000056, 2002. 
Charalambous, C., Pike, W. T., Kim, D., Samuel, H., Fernando, B., Bill, C., and Lognonné, P.: Seismic evidence for a highly heterogeneous Martian mantle, Science, 389, 899–903, https://doi.org/10.1126/science.adk4292, 2025. 
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Short summary
Mantle mass anomalies can deform Mars’ core–mantle boundary (CMB). Unlike Earth’s mainly degree 2–order 2 pattern, Mars’ Tharsis and crustal dichotomy cause multiple deformation types. Here, researchers studied how dynamic CMB topography affects Mars’ nutations and length-of-day (LOD). They found the main (though tiny) effect on nutations comes from degree 2–order 2, while LOD changes are too small to detect.
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