[MITgcm-support] Large runoff causes negative salinity
Mattia Almansi
mattia.almansi at jhu.edu
Wed Jun 22 13:22:06 EDT 2016
Hi Jean-Michel,
I tried to set useRealFreshWaterFlux=.TRUE., and it works! There aren't
negative salinities and results are reasonable.
Thank you,
Mattia
2016-06-19 17:58 GMT-04:00 Jean-Michel Campin <jmc at mit.edu>:
> 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
> > >>
> > >>
> > >
> > > _______________________________________________
> > > MITgcm-support mailing list
> > > 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
>
>
>
> > _______________________________________________
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> > MITgcm-support at mitgcm.org
> > http://mitgcm.org/mailman/listinfo/mitgcm-support
>
>
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>
--
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
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