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In this effort, we use a box model to test MAM and its components in isolation from the resolved atmospheric dynamics and other parameterized processes (e.g., clouds and radiation). The box model is updated to the MAM version used in the current E3SM (i.e., they share the same code and data structure), so that we can verify the same code and merge any code improvements to E3SM more easily. We have developed offline drivers for aerosol microphysical processes including water uptake, nucleation, condensation, coagulation, aging, and redistribution of particles among modes of different size ranges. In addition to performing unit tests for individual aerosol processes, the box model is also used to test numerical convergence for time integration of multiple processes and the impact of operator splitting. We show two examples in this presentation: 1) verification of the numerical solution for trace-gas condensation in terms of time step convergence; and 2) evaluation of the aerosol water uptake parameterization in MAM by varying the ceiling values of relative humidity.
Poster
MAM_poster_2019_E3SM-All-hands_Mtg_42x42.pdf