======  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)

**Data owner:**             Alf Kirkevåg (alf.kirkevag@met.no) 

**Revision Number:**        r164  

**Ensemble runs:**          No    

**Production computer used:** Cray XT 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:**           [[http://onlinelibrary.wiley.com/doi/10.1002/2013JD021279/full|Glantz et al. (2014)]]

**Papers in preparation:**  

**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

**Initialisation:**         Data from the end of a 1979-2005 AMIP simulations 

**Resolution:**             f19_f19 = 1.8x2.5

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

**Emission inventories**    RCP8.5 from IPCC AR5 

**Greenhouse gases:**       Prescribed concentrations 

**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 ) 

**Special considerations:**

**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)