This is to document a new procedure for generating atm initial condition file from analysis data. The essence of the workflow is no different than the commonly used ones (e.g., CAM tool interpic) for generating initial condition for new grids from existing ones, namely, horizontal and vertical remapping from source data grid to target grid. The emphasis of this workflow is to make use of builtin functionalities of the powerful NCO. Necessary intermediate steps are introduced to facilitate the use of NCO utilities to generate dynamically reasonably balanced initial conditions that are most likely ready for model simulations without additional spinup to filter fast gravity waves. This is effectively realized by adjusting surface pressure field to account for the mismatch in topography between the source and destination grids. The workflow is first put together to generate input files for SCREAM project's initialized simulations using IFS analysis provided by the DYAMOND Initiative. It can be easily adapted to other analysis or model data, including remapping from initial conditions from other SE grids used in by EAM.
The following illustration uses ne512 as target grid and IFS analysis as source data. The workflow will be streamlined to minimize user input and the intermediate codes (esp. IDL) will be hardened for portability.
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