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How the prescribed aerosols are interpolated in CAM4?

Dear all, I am using the input file named "aero_1.9x2.5_L26_1850-2005_c091112.nc" to do some prescribed-aerosol simulations, and I would like to change the aerosol amount in certain months. In this file, the date of the first year ranges from 18490115 to 18491215, and the date of the second year ranges from 18550115 to 18550115.  In order to specify the aerosol amount, I am wondering how the aerosol for the year 1850, 1851, ... ,1854 is generated?  Thanks! 
 
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