[MITgcm-support] PTRACERS Initialization

[Ryan Abernathey]

Hello,

I'm trying to do a tracer advection using an online model. Everything  
is working fine using
PTRACERS_Iter0 = 0,
PTRACERS_initialFile(1)='tracer0.bin',
etc.

However, I would like to add the tracer after the model has spun up a  
bit, so I just set
PTRACERS_Iter0 = 2000

This made the tracer zero at all timesteps. I found this in the  
documentation (http://mitgcm.org/r2_manual/latest/online_documents/node237.html 
):
"PTRACERS_Iter0 which is the integer timestep when the tracer  
experiment is initialized. If nIter0  = PTRACERS_Iter0 then the  
tracers are initialized to zero or from initial files. If nIter0  >   
PTRACERS_Iter0 then tracers (and previous timestep tendency terms) are  
read in from a the ptracers pickup file. Note that tracers of zeros  
will be carried around if nIter0  < PTRACERS_Iter0. "

This seems to explain my problem, but I still don't understand the  
best way to accomplish my goal.

I just want to start the tracer from my initialFile at an advanced  
timestep.

Thanks!
__________________
Ryan Abernathey
rpa at mit.edu
MIT Ph.D. Student
Program in Oceans Atmospheres & Climate
http://web.mit.edu/rpa/