Time Periodic Solutions for 3D Quasi-Geostrophic Model García López, Claudia 3D quasi-geostrophic equations Periodic solutions Bifurcation theory Eigenvalue problems C.G. has been partially supported by the MINECO-Feder (Spain) research Grant Number RTI2018098850-B-I00, the Junta de Andalucia (Spain) Project FQM 954, the MECD (Spain) research grant FPU15/04094, and the European Research Council through Grant ERC-StG-852741 (CAPA), T. H. has been partially supported by the ANR grant ODA (ANR-18-CE40-0020-01), and J. M. has been partially supported by MTM2016-75390 (Mineco, Spain) and 2017-SGR-395 (Generalitat de Catalunya) This paper aims to study time periodic solutions for 3D inviscid quasi–geostrophic model. We show the existence of non trivial rotating patches by suitable perturbation of stationary solutions given by generic revolution shapes around the vertical axis. The construction of those special solutions are done through bifurcation theory. In general, the spectral problem is very delicate and strongly depends on the shape of the initial stationary solutions. More specifically, the spectral study can be related to an eigenvalue problem of a self–adjoint compact operator. We are able to implement the bifurcation only from the largest eigenvalues of the operator, which are simple. Additional difficulties generated by the singularities of the poles are solved through the use of suitable function spaces with Dirichlet boundary condition type and refined potential theory with anisotropic kernels. 2022-02-09T13:28:22Z 2022-02-09T13:28:22Z 2021-12-13 journal article Published version: García, C., Hmidi, T. & Mateu, J. Time Periodic Solutions for 3D Quasi-Geostrophic Model. Commun. Math. Phys. (2022). [https://doi.org/10.1007/s00220-021-04290-w] http://hdl.handle.net/10481/72758 eng info:eu-repo/grantAgreement/EC/H2020/852741 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ open access Atribución-NoComercial-SinDerivadas 3.0 España Springer