Identifying climate model structural inconsistencies allows for tight constraint of aerosol radiative forcing od Regayre, LA, Deaconu, L, Grosvenor, DP, Sexton, DMH, Symonds, C, Langton, T, Watson-Paris, D, Mulcahy, JP, Pringle, KJ, Richardson, M, Johnson, JS, Rostron, JW, Gordon, H, Lister, G, Stier, P, Carslaw, KS