FlexGrid

NOTE: This page is being actively edited right now and the information might be incomplete.

FlexGrid documentation by Jiawei Zhuang (jiaweizhuang@g.harvard.edu)

Overview

FlexGrid is a new functionality in GEOS-Chem v11-02 to unify all metfield I/O routines by HEMCO.

HEMCO's interface and regridding&cropping capability allow users to

• Set up a nested simulation over any custom domains without changing model's source code.
• Explicitly control each meteorological variable in configuration files to perform various experiments (an interface resembling GCHP).

FlexGrid implementation plan

The table below shows the implementation plan for FlexGrid:

Stage	Detail	Status
Stage 1: Read metfields by HEMCO	Enable the compile option "MET=flexgrid" to read any NetCDF-format metfields through HEMCO. This unifies "MET=geosfp" and "MET=merra2"	Will be included in v11-02
Stage 2: Implement custom nested simulations	Enable the compile option "NEST=cu" (custom) to allow custom nested simulations.	Will be included in v11-02
Stage 3: Grid-independent GEOS-Chem classic	Unify compile options "GRID=xxx" by moving all grid size parameters and resolution-dependent parameters to run-time configuration files.	No specific plan right now. Need to be traded off against the nested-GCHP development.

FlexGrid Stage 2 User's Guide

=== Issues to discuss