HadCM3 model simulation including orbital forcing only from 12/850 to 11/1850. The dataset is divided into atmosphere monthly mean and ocean monthly mean files. All files are in netcdf format.
Orbital forcing has played a minor role on global annual temperature variation during the last Millennium. Prior to industrialisation, volcanism has been the largest contributor to naturally forced large-scale variability. While orbital forcing is strongest on time-scales of Millions of years, the axial precession causes changes in seasonal insolation at millennial timescales.
Here we investigate the effects of orbital forcing on long-term temperature trends in model simulations and proxy reconstructions of the Last Millennium. We show that in contrast to any other forcings, orbital forcing induces a strong seasonal signal in modelled surface temperatures, lagging behind the forcing by one to two months. We find that seasonal proxy reconstructions can reproduce a similar trend pattern as found in climate models and that they roughly agree on the magnitude of the Millennial trend. Our work emphasises the importance of using seasonally homogeneous data for reconstructing low frequency data.
Luecke, Lucie; Schurer, Andrew. (2021). HadCM3 model data used in the article "Seasonal long-term trends during the last Millennium strongly influenced by orbital forcing" by Lucie Luecke, Andrew Schurer, Rob Wilson and Gabriele Hegerl, 0850-1850 [dataset]. University of Edinburgh. School of GeoSciences. https://doi.org/10.7488/ds/3136.