A new paper is out by Rodolfo G. Cionco and Willie W. H. Soon: “Short Term Orbital Forcing (STOF): A quasi-review and a reappraisal of realistic boundary conditions for climate modeling“.
The abstract above states that the two authors found “important relative differences of up to +- 5%, which correspond to 2.5 W/sqm in the daily mean insolation“. They conclude: “this previously unrecognized error could have a significant impact in initial and boundary conditions for any climate modeling experiment.”
Willie Soon, a Harvard astrophysicist and skeptic of AGW science, wrote in an email:
To our best understanding, this new insolation calculation should supersede/replace the previous outputs provided by Berger & Loutre (1991) and Laskar et al. (2004) and their related publications especially since all these previous calculations/databases have not accounted for the modulating effects from STOF. “
The scientists summarize in the paper that the error “could spread and propagate with time especially when intra-annual insolation quantities are required” and that “the sensitivity of initial climate conditions to these differences should be addressed“.
In other words: it’s back (again) to the drawing board for the beleaguered climate modelers.
The full paper can be downloaded from: https://www.researchgate.net/profile/Rodolfo_Cionco All the supplementary data, both programs and input databases are available here: https://1drv.ms/f/s!Apqs4Ax-5XDXggROueG7s6FC8bqs.