DGVM Spinup

[maria_kvalevag@cicero_uio_no]

I am running CLM3.5 offline with DGVM. It is stated in the DGVM user guide to run the spin up for few hundred years. The offline simulations requires NCEPDATA as input, but are there available NCEPDATA going back that far? I use the Qian.T62.1948 -2004, i.e. 56 years, så how is it possible to run the model for as much as 200 years? Is it possible to do some sort of cycling of the atmopsheric inputdata?

Thanks,

 

[slevis]

Theoretically you can cycle through your 56 yrs multiple times using certain namelist options, but I'm not certain that these options work in clm3.5. The alternative that I've used is to trick the model into thinking that there's more data by linking the 1948-2004 files to other years, eg:

ln -s $oldyear-$month.nc $newyear-$month.nc

where oldyear ranges from 1948 to 2004 and newyear ranges from 2005 to whatever (and/or from whatever to 1947).

Sam