N_r99PDX

Purpose of simulation: Estimate the effect of BC on global and Arctic climate

Contact person: Alf Kirkevåg (alf.kirkevag@met.no)

Revision Number: r99

Production computer used: Cray XT3 in Bergen (hexagon)

Production date: October - November 2010

Storage locations: NorStore (/norstore_osl/projects/NS2345K/noresm/cases/N_r99PDX)

Storage space: 1500 Gb at NorStore

Projects: EarthClim/ACCESS

Publications:

Papers in preparation: Sand et al. (submitted)

Simulation name(s): N_r99PDX, where X = yr116, noBCyr116, noBCdepyr116

Compset name used: NAER2000

Model type: Fully coupled

Type of run: Initial

Simulation period: 92 years

Spin-up period: 116 years

Ensemble runs: No

Resolution: f19_g19 = 1.8×2.5

Emission year(s): 2000 (aerosols and precursors), but BC emissions set to 0 for X = noBCyr116. For X = noBCdepyr116 BC emissions are for year 2000, but deposition of BC on snow and sea-ice is set to 0.

Emission inventories IPCC AR5

Frequency for output: Monthly (for atm, ocn and lnd)

Active/changing forcing agents: Direct and indirect (1. & 2.) effects by anthropogenic SO4, POM and BC. The effects of all BC is found from the difference between the experiments (X yr116 and noBCyr116, and the effect of BC deposited on snow and sea-ice is found from the difference between (X yr116 and noBCdepyr116.

Tuning parameters which are changed relative to the host model CAM4:

rhminl: 0.90 lower RH threshold for formation of low stratiform clouds (0.91 in CAM4)

critrp: 5.0 mm/day maximum prcipitation rate for suppression of autoconversion of cloud water (0.5 mm/day in CAM4)

r3lc: 14 um critical mean droplet volume radius for onset of autoconversion (10 um in CAM4)