QNEG3 problem

[jyangdas@gmail_com]

Hi:

I can run coupled CCSM3 successfully. But when I change the solar constant to be 25% or 75% of present level, the model is blowing up after several years' run. The logout message is like this:

25: QNEG4 WARNING from TPHYSAC , lchnk = 37; Max possible LH flx exceeded at 1 points. Worst excess = -4.7795E-09 at i = 15
20: significant conservations error water after hk_evap count 2 nstep 44898 chunk 150 col 14
20: 1.79163918825345858 1.79163918523175036 -0.324103535064446113E-02 -0.290433629502700907 -0.324103837235277699E-02 -0.168351524365756363E-08
21: SPHDEP: ****** MODEL IS BLOWING UP *********

or like this:

QNEG3 from zm_convr/Q:m= 1 lat/lchnk=277 Min. mixing ratio violated at 1 points. Reset t
o 1.0E-12 Worst =-9.6E-07 at i,k= 11 18
25: significant conservations error energy after zm_evap count 1 nstep 43070 chunk 277 col 11
25: 2944957948.60852194 2944956059.96286488 -9566.48291921615601 -11455.1285762005991 -11455.1285762005991 -0.641312899848366598E-06
25: significant conservations error water after zm_evap count 2 nstep 43070 chunk 277 col 11 25: 5.57999262063174317 5.57932636118415193 -0.678591440150453806 -0.679257699598044828 -0.679257
699598044828 -0.106455300611233656E-03

Does any body can help me?

Jun Yang

 

[eaton]

The line that indicates the problem is

SPHDEP: ****** MODEL IS BLOWING UP *********

This usually means that a CFL condition has been exceeded and that the timestep needs to be reduced.