Acta Geodynamica et Geomaterialia

Title: DECADAL CYCLES OF EARTH ROTATION, MEAN SEA LEVEL AND CLIMATE, EXTITED BY SOLAR ACTIVITY
Authors: Chapanov Yavor, Ron Cyril and Vondrák Jan
DOI: 10.13168/AGG.2017.0007
Journal: Acta Geodynamica et Geomaterialia, Vol. 14, No. 2 (186), Prague 2017
Full Text: PDF file (1.0 MB)
Keywords: Earth rotation, solar activity, mean sea level, climate, ENSO, decadal cycles
Abstract: The solar activity affects all surface geosystems, including weather and climate indices, winds, rains, snow covers, mean sea level, river streamflows and other hydrological cycles. The mean sea level and polar ice changes cause common variations of the principal moments of inertia and Earth rotation with decadal, centennial and millennial periods. The mean sea level, Earth rotation and climate indices have also some oscillations with periods below 40 years, whose origin is not connected with the known tidal and solar effects. The shape of solar cycles is rather different from sinusoidal form, so they affect geosystems by many short-term harmonics. A possible solar origin of decadal variations of Earth rotation, mean sea level and climate indices is investigated by the harmonics of Jose, de Vries and Suess cycles with centennial periods of 178.7, 208 and 231 years. The common decadal cycles of solar-terrestrial influences are investigated by long time series of Length of Day (LOD), Mean Sea Level (MSL) variations at Stockholm, El-Niño/Southern Oscillation (ENSO), temperature and precipitation over Eastern Europe, Total Solar Irradiance (TSI), Wolf’s Numbers Wn and North-South solar asymmetry. A good agreement exists between the decadal cycles of LOD, MSL, climate and solar indices whose periods are between 12-13, 14-16, 16-18 and 28-33 years. The new linear models of the decadal common Earth and solar cycles may help for long term forecasts of many global and local changes.