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What is the nean of "chunk"?

A

abnian@163_com

New Member
Hi everyone!
What is the neaning of "chunk"?what is the differentiation between ''prescribed sulfur" and "prognostic sulfur"?
Thank you!
 
R

rneale

Rich Neale
CAM Project Scientist
Staff member
A chunk refers to the collection of atmospheric columns 'ncols' that is assigned to a particular mpi tasks. The key thing is that the columns are not necessarily physically adjacent to each other, and are distributed to the individual mpi tasks in a (hopefully) computationally efficient way.

Prescribed sulphur means there are no time-dependent sources and sinks of sulphur and it is advected by the model winds. Prognostic means the constituent in question has sources and sinks and is advected by the model winds.
 
R

rneale

Rich Neale
CAM Project Scientist
Staff member
Just one error I spotted in my response. Prescribed sulphur is NOT advected by the model winds. It is essentially a fixed quantity - apologies.
 
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