Re-evaluating the role of solar variability on Northern Hemisphere temperature trends since the 19th century
Willie Soon, Ronan Connolly, Michael Connolly Abstract Debate over what influence (if any) solar variability has had on surface air temperature trends since the 19th century has been controversial. In this paper, we consider two factors which may have contributed to this controversy: Several different solar variability datasets exist. While each of these datasets is constructed on plausible grounds, they often imply contradictory estimates for the trends in solar activity since the 19th century. Although attempts have been made to account for non-climatic biases in previous estimates of surface airtemperature trends, recent research by two of the authors has shown …