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Errors about changing topography in WACCM

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xiaxin@lasg_iap_ac_cn

New Member
Hi  I want to change the topography in WACCM （eg. Reduce the height of mountains）. I made changes to PHIS, SGH, SGH30 in the topo file. Howerer, it always died out within a few minutes.  PS, I use CESM 1.0.4, case compset: FW, res: f19_f19 Error message in the log file is:*******************************************Opened file origin.cam2.h1.1979-01-01-00000.nc to write         125 Opened file origin.cam2.h2.1979-01-01-00000.nc to write         126 Opened file origin.cam2.h3.1979-01-01-00000.nc to write         127 Opened file origin.cam2.h4.1979-01-01-00000.nc to write         128  filew failed, worst i, j, qtmp, q =            1           4 -1.501219885893109E-252  2.064539803665195E-267  filew failed, worst i, j, qtmp, q =            1          55 -5.603381093681555E-166  1.499971372258972E-224  filew failed, worst i, j, qtmp, q =            1          55 -1.104077389905825E-162  6.833000159141414E-226  filew failed, worst i, j, qtmp, q =            1          84 -6.501329917614364E-035  9.858784748701748E-037 QNEG3 from TPHYSBCb:m=  4 lat/lchnk=  904 Min. mixing ratio violated at    1 points.  Reset to  1.0E-12 Worst =-2.2E-11 at i,k=   4  1  filew failed, worst i, j, qtmp, q =            1          57 -2.898403113253403E-181  1.019470732001682E-233  filew failed, worst i, j, qtmp, q =            1          55 -1.027621033154234E-183  6.559284865460349E-227forrtl: severe (174): SIGSEGV, segmentation fault occurredImage              PC                Routine            Line        Source             ccsm.exe           0000000000B50B5C  tp_core_mp_xtpv_          468  tp_core.F90ccsm.exe           0000000000B5B273  tp_core_mp_tp2c_          119  tp_core.F90ccsm.exe           0000000000B44852  sw_core_mp_c_sw_          309  sw_core.F90ccsm.exe           0000000000A865F9  cd_core_                  732  cd_core.F90ccsm.exe           00000000007A399C  dyn_comp_mp_dyn_r        1820  dyn_comp.F90ccsm.exe           00000000005CA842  stepon_mp_stepon_         420  stepon.F90ccsm.exe           0000000000471000  cam_comp_mp_cam_r         225  cam_comp.F90ccsm.exe           0000000000465C70  atm_comp_mct_mp_a         549  atm_comp_mct.F90ccsm.exe           00000000004085C6  ccsm_comp_mod_mp_        2166  ccsm_comp_mod.F90ccsm.exe           000000000041699D  MAIN__                     91  ccsm_driver.F90ccsm.exe           0000000000405EDC  Unknown               Unknown  Unknownlibc.so.6          000000310C01ECDD  Unknown               Unknown  Unknownccsm.exe           0000000000405D69  Unknown               Unknown  Unknownforrtl: severe (174): SIGSEGV, segmentation fault occurredImage              PC                Routine            Line        Source             ccsm.exe           0000000000B50B5C  tp_core_mp_xtpv_          468  tp_core.F90ccsm.exe           0000000000B5B273  tp_core_mp_tp2c_          119  tp_core.F90ccsm.exe           0000000000B44852  sw_core_mp_c_sw_          309  sw_core.F90ccsm.exe           0000000000A865F9  cd_core_                  732  cd_core.F90ccsm.exe           00000000007A399C  dyn_comp_mp_dyn_r        1820  dyn_comp.F90ccsm.exe           00000000005CA842  stepon_mp_stepon_         420  stepon.F90ccsm.exe           0000000000471000  cam_comp_mp_cam_r         225  cam_comp.F90ccsm.exe           0000000000465C70  atm_comp_mct_mp_a         549  atm_comp_mct.F90ccsm.exe           00000000004085C6  ccsm_comp_mod_mp_        2166  ccsm_comp_mod.F90ccsm.exe           000000000041699D  MAIN__                     91  ccsm_driver.F90ccsm.exe           0000000000405EDC  Unknown               Unknown  Unknownlibc.so.6          000000310C01ECDD  Unknown               Unknown  Unknownccsm.exe           0000000000405D69  Unknown               Unknown  Unknownforrtl: severe (174): SIGSEGV, segmentation fault occurredImage              PC                Routine            Line        Source             ccsm.exe           0000000000B50B5C  tp_core_mp_xtpv_          468  tp_core.F90ccsm.exe           0000000000B5B273  tp_core_mp_tp2c_          119  tp_core.F90ccsm.exe           0000000000B44852  sw_core_mp_c_sw_          309  sw_core.F90ccsm.exe           0000000000A865F9  cd_core_                  732  cd_core.F90ccsm.exe           00000000007A399C  dyn_comp_mp_dyn_r        1820  dyn_comp.F90ccsm.exe           00000000005CA842  stepon_mp_stepon_         420  stepon.F90ccsm.exe           0000000000471000  cam_comp_mp_cam_r         225  cam_comp.F90ccsm.exe           0000000000465C70  atm_comp_mct_mp_a         549  atm_comp_mct.F90ccsm.exe           00000000004085C6  ccsm_comp_mod_mp_        2166  ccsm_comp_mod.F90ccsm.exe           000000000041699D  MAIN__                     91  ccsm_driver.F90ccsm.exe           0000000000405EDC  Unknown               Unknown  Unknownlibc.so.6          000000310C01ECDD  Unknown               Unknown  Unknownccsm.exe           0000000000405D69  Unknown               Unknown  Unknownrank 26 in job 1  c0109.cm.cluster_40240   caused collective abort of all ranks  exit status of rank 26: killed by signal 9 How do i solve this error? Is there any thing else I need to change? Thanks in advance!xin 
 
J

jedwards

CSEG and Liaisons
Staff member
This is an indication of a CFL condition.   My guess is that your change in the topography created a large inbalance in the atmospheric initial condition and the model is trying to compensate.   One possible solution is to set the timestep very small and run for a few days, then write a new initial condition file and start from that with the default timestep.  You should also consider updating to a newer version of the model.   1.0.4 is quite out of date
 
S

santos

Member
As Jim Edwards says, it's likely that some spinup is needed. Note also that the CAM topography files are typically smoothed as described here:http://www.cgd.ucar.edu/cms/pel/papers/LBCT2015GMD.pdfUnsmoothed data is likely to cause the model to be less stable, though maybe that is less of a concern if you are simply reducing heights in a file that has already been smoothed. It depends on what exactly you are doing?
 
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