What is the 18 year lunar cycle4/14/2024 Unfortunately, this much shorter cycle is not directly observed in the observational data, making it a challenge to determine how the pattern manifests itself. In particular, every ~2 weeks the moon makes a complete north-south-north declination cycle that likely has a huge impact on the climate as it sloshes the subsurface thermocline (cite the paper by Lin & Qian 1). That may indeed be the case, but it likely pales in comparison to the other so-called long-period tidal cycles. The premise of the paper is that the ocean will show modulation of mixing with a cycle of ~18 years corresponding to the 18.6-year lunar declination cycle. ![]() Paper under review “The modelled climatic response to the 18.6-year lunar nodal cycle and its role in decadal temperature trends”
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