The 18.6-year lunar nodal cycle and its modelled effect on the oceans

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• Prof. Manoj Joshi
• Monday 05 December 2022, 14:30-15:30
• Unilever Lecture Hall (and zoom https://us02web.zoom.us/j/84313398848?pwd=b1RaNGV5cm1jQ1hIOXBLd1hQRzdGQT09 ).

If you have a question about this talk, please contact lj384.

The 18.6-year lunar nodal cycle arises from variations in the angle of the Moon’s orbital plane. Previous work has linked the nodal cycle to climate but has been limited, either by the length of observations analysed, or geographical regions considered in model simulations of the pre-industrial period. Here we examine the global effect of the lunar nodal cycle in multi-centennial climate model simulations of the pre-industrial period. We find cyclic signals in global and regional surface air temperature having amplitudes of 0.05K or so, ocean heat uptake and ocean heat content. The timing of anomalies of global surface air temperature and heat uptake are consistent with the so-called slowdown in global warming in the first decade of the 21st century, also displaying warmer than average Arctic surface temperatures at the same time. We comment on other features of the response and implications for decadal climate prediction

This talk is part of the Centre for Atmospheric Science seminars, Chemistry Dept. series.

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