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This PR updates submodule HEMCO_CESM to version 2.1.0 and adds new ERS tests for CAM-chem in HEMCO. The new version of HEMCO_CESM includes fixes to allow ERS tests of CAM-chem with HEMCO to pass if restarted on the hour. The new tests (10hr) do this, allowing us to demonstrate that the issue with current ERS tests (9hr) is understood to be caused by restarting mid-hour.
Part of this fix is also to use a new HEMCO_Config.rc file which specifies hourly rather than monthly read of aviation emissions. This is necessary to force vertical regridding to model pressure levels at the highest frequency possible in HEMCO (hourly).
Additional improvements in this update are:
See issue discussion at #856
See HEMCO_CESM updates related to the ERS test problem at ESCOMP/HEMCO_CESM#41