[MITgcm-support] Large runoff causes negative salinity
Jean-Michel Campin
jmc at mit.edu
Sun Jun 19 17:58:16 EDT 2016
Hi Mattia,
You may want to try to set:
useRealFreshWaterFlux=.TRUE.,
in main parameter file "data", namelist: PARM01
This would remove the need to convert surface fresh-water into a salt-flux
(more realistic, specially since you are using non-linear free-surf).
But if you don't want to switch on RealFreshWaterFlux, you could
still try to set:
convertFW2Salt=-1., (again, same file & namelist)
so that the conversion will use the local salinity (instead of a constant value)
Cheers,
Jean-Michel
On Sun, Jun 19, 2016 at 02:56:25PM -0400, Mattia Almansi wrote:
> Hi Ryan,
>
> I'm currently using the advection scheme 33.
> Attached are my data and data.exf files.
>
> Thanks,
> Mattia
>
>
>
> - Here is the contents of the data file attached:
>
> #
> # ******************************
> # Model parameters
> # Continuous equation parameters
> # ******************************
> &PARM01
> viscAz =1.E-5,
> diffK4T=0.0,
> diffKzT=1.E-5,
> diffK4S=0.0,
> diffKzS=1.E-5,
> viscAhGridMax=0.25,
> viscC2Leith=0.0,
> viscAhGrid=0.0,
> useAnisotropicViscAGridMax=.TRUE.,
> viscA4GridMax=0.25,
> viscC4Leith=1.0,
> viscA4Grid=0.0,
> no_slip_sides=.TRUE.,
> no_slip_bottom=.TRUE.,
> bottomDragQuadratic = 0.001,
> rigidLid=.FALSE.,
> implicitFreeSurface=.TRUE.,
> #--- z* - begin
> nonlinFreeSurf = 4,
> exactConserv = .TRUE.,
> select_rStar = 2,
> hFacInf = 0.01,
> hFacSup = 2.5,
> #--- z* - end
> #--- - debugMode in eedata
> debugLevel = 3,
> eosType='JMD95Z',
> readBinaryPrec=64,
> writeBinaryPrec=64,
> useSingleCpuIo=.TRUE.,
> globalFiles=.TRUE.,
> hFacMin=0.1,
> hFacMinDz=5.,
> allowFreezing=.FALSE.,
> HeatCapacity_Cp = 3986.D0,
> gravity = 9.8156,
> gBaro = 9.8156,
> rhoNil = 1027.D0,
> implicitDiffusion=.TRUE.,
> implicitViscosity=.TRUE.,
> vectorInvariantMomentum=.TRUE.,
> staggerTimeStep=.TRUE.,
> tempAdvScheme=33,
> saltAdvScheme=33,
> MultiDimAdvection=.TRUE.,
> &
>
> # **************************
> # Elliptic solver parameters
> # **************************
> &PARM02
> cg2dMaxIters=1000,
> cg2dTargetResidual=1.E-13,
> &
>
> # ************************
> # Time stepping parameters
> # ************************
> &PARM03
> nIter0=0,
> endTime=259200.0,
> deltaT=30.0,
> tauCD=0.,
> cAdjFreq=0.,
> abEps=0.1,
> forcing_In_AB=.FALSE.,
> chkptFreq=604800.,
> pChkptFreq=864000.0,
> dumpFreq=21600.,
> diagFreq=0.,
> monitorFreq=3600.,
> &
>
> # *******************
> # Gridding parameters
> # *******************
> &PARM04
> usingCartesianGrid=.FALSE.,
> usingSphericalPolarGrid=.TRUE.,
> delZ= 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
> 13, 14, 203*15,
> ygOrigin=+56.79340,
> xgOrigin=-46.95949,
> delY= [see attached file]
> delX= [see attached file]
> rSphere = 6371.D3,
> &
> # **********
> # Data Files
> # **********
> &PARM05
> bathyFile='Bat_irm2kmGlacAuto.bin',
> hydrogThetaFile='Temp_Initial_irm2kmGlacAuto.bin',
> hydrogSaltFile='Salt_Initial_irm2kmGlacAuto.bin',
> uVelInitFile='Uvel_Initial_irm2kmGlacAuto.bin',
> vVelInitFile='Vvel_Initial_irm2kmGlacAuto.bin',
> pSurfInitFile='Eta_Initial_irm2kmGlacAuto.bin',
> # set to false to avoid checking for theta=0 and salt=0 when we start with
> sea ice temp and salt
> checkIniTemp=.TRUE.,
> checkIniSalt=.TRUE.,
> &
>
> # Open boundaries
> &PARM06
> &
>
> # KPP Mixing scheme
> &PARM07
> &
>
>
>
>
> - Here is the contents of the data.exf file attached:
>
> #
> # *********************
> # External Forcing Data
> # *********************
> &EXF_NML_01
> #
> useExfCheckRange = .TRUE.,
> exf_iprec = 64,
> exf_yftype = 'RL',
> &
> #
> # *********************
> &EXF_NML_02
> # format
> # startdate1=YYYYMMDD
> # startdate2=HHMMSS
> # *********************
> #
> atempstartdate1 = 20061231,
> atempstartdate2 = 000000,
> atempperiod = 10800.0,
> #
> aqhstartdate1 = 20061231,
> aqhstartdate2 = 000000,
> aqhperiod = 10800.0,
> #
> evapstartdate1 = 20061231,
> evapstartdate2 = 013000,
> evapperiod = 10800.0,
> #
> precipstartdate1 = 20061231,
> precipstartdate2 = 013000,
> precipperiod = 10800.0,
> #
> uwindstartdate1 = 20061231,
> uwindstartdate2 = 000000,
> uwindperiod = 10800.0,
> #
> vwindstartdate1 = 20061231,
> vwindstartdate2 = 000000,
> vwindperiod = 10800.0,
> #
> # swfluxstartdate1 = 20061231,
> # swfluxstartdate2 = 013000,
> # swfluxperiod = 10800.0,
> #
> # lwfluxstartdate1 = 20061231,
> # lwfluxstartdate2 = 013000,
> # lwfluxperiod = 10800.0,
> #
> swdownstartdate1 = 20061231,
> swdownstartdate2 = 013000,
> swdownperiod = 10800.0,
> #
> lwdownstartdate1 = 20061231,
> lwdownstartdate2 = 013000,
> lwdownperiod = 10800.0,
> #
> climsststartdate1 = 20061231,
> climsststartdate2 = 120000,
> climsstperiod = 86400.0,
> # restoring timescale for sea sur. temperature
> climsstTauRelax = 86400.0,
> #
> runoffstartdate1 = 20061231,
> runoffstartdate2 = 000000,
> runoffperiod = 86400.0,
> #
> atempfile = 'atemp_EraInterim3h_irm2kmGlacAuto_20061231_20070112.bin',
> aqhfile = 'sphum_EraInterim3h_irm2kmGlacAuto_20061231_20070112.bin',
> uwindfile = 'uwind_EraInterim3h_irm2kmGlacAuto_20061231_20070112.bin',
> vwindfile = 'vwind_EraInterim3h_irm2kmGlacAuto_20061231_20070112.bin',
> evapfile = 'evapr_EraInterim3h_irm2kmGlacAuto_20061231_20070112.bin',
> precipfile = 'preci_EraInterim3h_irm2kmGlacAuto_20061231_20070112.bin',
> # lwfluxfile = 'nlwfl_EraInterim3h_irm2kmGlacAuto_20061231_20070112.bin',
> # swfluxfile = 'nswfl_EraInterim3h_irm2kmGlacAuto_20061231_20070112.bin',
> lwdownfile = 'dlwfl_EraInterim3h_irm2kmGlacAuto_20061231_20070112.bin',
> swdownfile = 'dswfl_EraInterim3h_irm2kmGlacAuto_20061231_20070112.bin',
> climsstfile = 'OstiaDailySst_irm2kmGlacAuto_20061231_20070112.bin',
> runoffFile = 'runoff_Glacier_irm2kmGlacAuto_20061231_20070112.bin',
> runoftempFile = 'runoftemp_Glacier_irm2kmGlacAuto_20061231_20070112.bin',
> &
> #
> # *********************
> &EXF_NML_03
> &
> #
> # *********************
> &EXF_NML_04
> &
> #
> # *********************
> &EXF_NML_OBCS
> obcsNstartdate1 = 20061231,
> obcsNstartdate2 = 000000,
> obcsNperiod = 86400.0,
> #
> obcsSstartdate1 = 20061231,
> obcsSstartdate2 = 000000,
> obcsSperiod = 86400.0,
> #
> obcsEstartdate1 = 20061231,
> obcsEstartdate2 = 000000,
> obcsEperiod = 86400.0,
> #
> obcsWstartdate1 = 20061231,
> obcsWstartdate2 = 000000,
> obcsWperiod = 86400.0,
> #
> ##### SEA ICE OBCS
> #
> siobNstartdate1 = 20061215,
> siobNstartdate2 = 000000,
> siobNperiod = 2635200.0,
> #
> siobSstartdate1 = 20061215,
> siobSstartdate2 = 000000,
> siobSperiod = 2635200.0,
> #
> siobEstartdate1 = 20061215,
> siobEstartdate2 = 000000,
> siobEperiod = 2635200.0,
> #
> siobWstartdate1 = 20061215,
> siobWstartdate2 = 000000,
> siobWperiod = 2635200.0,
> &
>
> 2016-06-19 13:18 GMT-04:00 Ryan Abernathey <ryan.abernathey at gmail.com>:
>
> > Hi Mattia,
> >
> > This could be related to your advection scheme. Please provide your full
> > data and data.exf files in order to help people diagnose the problem.
> >
> > -Ryan
> >
> > On Sun, Jun 19, 2016 at 1:02 PM, Mattia Almansi <mattia.almansi at jhu.edu>
> > wrote:
> >
> >> Dear all,
> >>
> >> I'm setting up a configuration which includes part of Greenland's East
> >> coast.
> >> I'm having some issues with the runoff: the salinity output field is
> >> negative where the runoff is large. There are some large runoff values
> >> (e.g. 1.e-4 m/s into the fjords) because I want to include both glacier
> >> runoff and solid ice discharge.
> >> Is there any way to avoid this problem?
> >>
> >> Thanks in advance,
> >> Mattia
> >>
> >> --
> >> Mattia Almansi,
> >> Ph.D. Student,
> >> Johns Hopkins University,
> >> Department of Earth and Planetary Sciences,
> >> 315 Olin Hall - 3400 N. Charles Street, Baltimore, MD 21218
> >>
> >> e-mail: mattia.almansi at jhu.edu
> >>
> >> _______________________________________________
> >> MITgcm-support mailing list
> >> MITgcm-support at mitgcm.org
> >> http://mitgcm.org/mailman/listinfo/mitgcm-support
> >>
> >>
> >
> > _______________________________________________
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> > MITgcm-support at mitgcm.org
> > http://mitgcm.org/mailman/listinfo/mitgcm-support
> >
> >
>
>
> --
> Mattia Almansi,
> Ph.D. Student,
> Johns Hopkins University,
> Department of Earth and Planetary Sciences,
> 315 Olin Hall - 3400 N. Charles Street, Baltimore, MD 21218
>
> e-mail: mattia.almansi at jhu.edu
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support
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