Sea Ice Ancil Problem

[ata27]

Hi,

I am having an issue getting a job running using a sea ice field that I have been given from a different resolution model run. The job I want to run is a N48L60 7.3 job. I have been given some ancils from a N96L38 run and have used convsh to convert the ancils to N48L60 ncdf files and then xancil to recreate the ancils (at the new resolution). By doing a series of swaps of the ancils I found that the new job falls over when I include the regrided sea ice with the .leave file suggesting that the model dies in convection.

In convsh I extrapolated the seaice over 2 neighbours and in xancil I made sure to use land fraction as the mask for the sea ice.

I was just wondering if this a common problem that other users have encountered before? Or if any one has an idea about other things I could try when converting the ancils?

Thanks!

Alex

[jeff]

Hi Alex

When you created the ice ancillary files did you also create the corresponding sst files? Could you let me know the umui job id and where the xancil job files are, thanks.

Jeff.

[ata27]

Hi Jeff,

Thanks for the reply. I think I actually got the sea ice to work. But I had to use a bilinear interpolation not an area weighted one. Does that sound reasonable for a variable like sea ice? In my mind thinks like surface emissions should be interpolated using area weighting to maintain the mass emitted but I dont have a feel for when or when not this bilinear interpolation is suitable? Is there a general rule of thumb you can suggest?

As ever thanks!

Alex

[jeff]

Hi Alex

Glad you got it working now. As for when to use which method of interpolation, that is not an area I know much about you probably know more than me.

Jeff.