Hi all, I finally found the source of my insolation issue. Just an error in the scripts I used to handle the raw GCM outputs. The mean annual, globally averaged value of FSOL that I obtain is now much closer to SOLC = 342 W.m-2 : 342.3 W.m-2 without ALLOW_INSOLATION and 341.7 W.m-2 with it. Many thanks again, Alexandre