date: Wed, 20 Jul 2005 10:58:48 -0600 (MDT)
from: Bette Otto-Bliesner <ottobli@ucar.edu>
subject: [Wg1-ar4-ch06] Basis for radiative forcings in Figure 6.3.1-2
to: wg1-ar4-ch06@joss.ucar.edu

<x-flowed>

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
</x-flowed>
