date: Wed, 20 Jul 2005 10:58:48 -0600 (MDT) from: Bette Otto-Bliesner subject: [Wg1-ar4-ch06] Basis for radiative forcings in Figure 6.3.1-2 to: wg1-ar4-ch06@joss.ucar.edu Hi all, Here are the numbers I used for the radiative forcing panel of Figure 6.3.1-2. GHGs - PMIP-2 concentrations for LGM and PreI: LGM PreI CO2 185 280 CH4 350 760 N2O 200 270 - Ice cores measurement uncertainties of +/- 5 ppm for CO2, +/- 20 ppb for CH4, +/- 10 ppb for N2O from Jacqueline Fluckiger, Valerie, and Dominique. - TAR formulas to convert to radiative forcings, uncertainties in calculation both as per discussions with Ramaswamy. radiative forcing: CO2 -2.22, uncertainty range -1.87 to -2.60 W/m2 CH4+N2O -0.54, uncertainty range -0.40 to -0.68W/m2 Mineral Dust - Claquin et al. (2003) Table 1, deltas Exp1-3. r.f. = -1.4, uncertainty range -1 to -2 W/m2 Continental ice sheet and sea level - PMIP-1 estimates from Taylor et al., will update to PMIP-2 values if they become available for the SOD r.f. = -3, uncertainty range -1.9 to -4 W/m2 Vegetation - calculations by Crucifix based on his recently accepted paper in Climate Dynamics r.f = -1.2, uncertainty range 1.0 to 1.4 W/m2 Bette ______________________________________________ Bette L. Otto-Bliesner Climate Change Research National Center for Atmospheric Research 1850 Table Mesa Drive / P.O. Box 3000 Boulder, Colorado 80307 Phone: 303-497-1723 Fax: 303-497-1348 Email: ottobli@ncar.ucar.edu ______________________________________________ _______________________________________________ Wg1-ar4-ch06 mailing list Wg1-ar4-ch06@joss.ucar.edu http://www.joss.ucar.edu/mailman/listinfo/wg1-ar4-ch06