Saturday, March 17, 2012

2558.txt

date: Wed, 20 Jul 2005 10:58:48 -0600 (MDT)
from: Bette Otto-Bliesner <ottobliatXYZxyzr.edu>
subject: [Wg1-ar4-ch06] Basis for radiative forcings in Figure 6.3.1-2
to: wg1-ar4-ch06atXYZxyzs.ucar.edu

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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: ottobliatXYZxyzr.ucar.edu
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