upgrade OPAC aerosol with more advanced MERRA2 aerosol

[AnningCheng-NOAA]

Description

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Upgrade the 5 degree by 5 degree low resolution OPAC aerosol with MERRA2 aerosol

Solution

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read and interpolate the new MERRA2 data set to couple with radiation and microphysics

Alternatives

If applicable, add a description of any alternative solutions or features you've considered.
N/A

Testing:

1. Have you tested the code changes? On what platforms? code has been tested in DELL, Hera, and Orion
2. Have you run regression test in ufs-weather-model or ufs-s2s-model with code changes? yes

• Will the baseline results change? yes
• If yes, please give brief explanation of your code updates on the regression test.
  the code changes can be fully tested in suites csawmg.

Dependent PRs:

Directly reference any issues or PRs in this or other repositories that this is related to, and describe how they are related. Example:

• required to support noaa-emc/GFDL_atmos_cubed_sphere/issues/<issue_number>
• adding README file for workflow testing purposes NCAR/ccpp-physics#2
• associated ufs-weather-model/pull/451