sdeastham
commented
1 month ago Disabling the remapping used to account for vertical velocity seems to fix this issue. See the below (noting that vertical velocity was zero for both this and the previous image):
I will put a temporary kludge in place to disable vertical velocities, but a longer-term fix will be needed (potentially involving the use of a pressure coordinate instead of altitude).
In the current version of APCEMM, a strange striping seems to occur. If all transport and ice growth processes are turned off, and the contrail size is expanded to 5 times normal, you can see this evolving over several time steps. This is generally somewhat difficult to observe, but does bias simulations and may increase in visibility with decreasing time step length. Results below are from a simulation with a one minute transport time step and fixed meteorology (100 meter discretization, which appears to be related to the odd striping pattern frequency):
Additional debugging suggests this is occurring during the call to remapVariable. Further diagnosis is underway.