Solar variability and the search for corresponding climate signals

Instrumental and paleodata from the last centuries are investigated to get circumstantial evidence for external influences on the Earth's climate mach ine. Such influences could be of extraterrestrial and/or anthropogenic orig in. Anthropogenic influences are separated from solar on superdecadal time scales and on a hemispheric level using a non-linear regression model. The function to be explained is the northern hemispheric temperature. The model contains two forcing components explicitly: A parameterized anthropogenic component, which describes the aggregated effect of greenhouse gases, aeros ols and other anthropogenic climate impacts. A solar component, which descr ibes the solar variability history. The solution of the regression model al lows, under certain assumptions, a functional separation of the variability components and provides an estimation of their relative contributions to g lobal warming during the last 140 years.