swuerth@berkeley_edu
New Member
Hello all,I am using CAM 5fv (1deg x 1deg) for a CO2 budget analysis, and my analysis depends on column-integrated dry air mass being conserved at each grid box. I have outputted instantaneous values for U, V, and PDELDRY for each 30-minute time step and have used this output off line to quantify (d/dt)(column-summed dry air mass) and column-summed horizontal divergence of dry air mass. If total column dry air mass is conserved, the sum of these 2 terms should be zero at each grid box. However, I am finding that the divergence term’s magnitude is much larger (in some places more than 10x larger) than the time derivative term. I am wondering if my approach or assumptions are flawed in some way, or if I should be using an air mass (i.e. PDELDRY) other than the one outputted to the history file. Maybe I need to save the dry air mass before some filter is called? Thanks.