A numerical method for detection of unstable periodic orbits on attractors of nonlinear models is proposed.   The method requires similar techniques to data assimilation.   This fact facilitates its implementation for geophysical models. https://www.remtavares.com/best-offer-Merrick-Backcountry-Grain-Free-Kitten-Pate-Canned-Wet-Cat-Food-5-5-oz-Cans-Case-of-24-p14288-limited-choice/