NF2006to2008r164

Model-run description for a simulation with CAM4-Oslo (NorESM1-M)

Purpose of simulation: Model validation for Arctic PD conditions

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

Revision Number: r164

Production computer used: Cray XT6 in Bergen (hexagon)

Production date: October 2013

Storage locations: NorStore (/norstore_osl/projects/NS2345K/noresm/cases/NF2006to2008r164/)

MET Norway (local disk)

Storage space: 9 Gb at NorStore, 25 Gb at MET Norway

Projects: EarthClim/ACCESS

Publications:

Papers in preparation: Glantz et al. (submitted)

Simulation name(s): NF2006to2008r164

Compset name used: NF_2006-2008_AER_AMIP_OBS

Model type: Stand-alone cam (atmosphere) default with prescribed ocn/ice (ocean and sea-ice)

Type of run: Branch

Simulation period: 3 years

Spin-up period: 0 years in the branch run itself, but continued from 1979-2005

Ensemble runs: No

Resolution: f19_f19 = 1.8×2.5

Emission year(s): 2006 - 2008 (aerosols and precursors)

Emission inventories RCP8.5 from IPCC AR5

Frequency for output: Monthly

Active/changing forcing agents: In principle, direct and indirect (1. & 2.) effects by anthropogenic SO4, POM and BC, but aerosols were run offline (CAM4-Oslo aerosols do not affect the model meteorology, only prescribed aerosols and CDNC from CAM4 )

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)