Tag name (The PR title should also include the tag name):
Originator(s): @jimmielin

Description (include issue title and the keyword ['closes', 'fixes', 'resolves'] and issue number):

• Closes CCPPize prescribed_volcaero (prescribed volcanic aerosol) #363 - this is the CAM-SIMA version of prescribed_volcaero; will NOT go back to CAM since the tracer_data interface is different

List all namelist files that were added or changed:
A schemes/chemistry/prescribed_volcanic_aerosol_namelist.xml

List all files eliminated and why: N/A

List all files added and what they do:

A       schemes/chemistry/prescribed_volcanic_aerosol.F90
A       schemes/chemistry/prescribed_volcanic_aerosol.meta
  - new scheme

List all existing files that have been modified, and describe the changes:
(Helpful git command: git diff --name-status development...<your_branch_name>)

M       test/test_suites/suite_tracer_data_test.xml
  - add to existing tracer_data BAM test

List all automated tests that failed, as well as an explanation for why they weren't fixed: N/A

Is this an answer-changing PR? If so, is it a new physics package, algorithm change, tuning change, etc?
New physics package for the tracer data test.

If yes to the above question, describe how this code was validated with the new/modified features:
Updated snapshot; tested with CAM snapshot for correctness