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 variables in configuration files to perform various experiments (an interface resembling GCHP)

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	Unifying compile options"GRID=xxx" by moving all grid size and related parameters to run-time configuration files.	No specific plan right now. To do be traded off against the nested-GCHP.