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Should total MERRA-2 black-carbon surface deposition be calculated from four variables (BCDP001/002 + BCWT001/002), or should BCSD001/002 sedimentation also be included, and would including them cause double counting?

While processing the MERRA-2 monthly files, I noticed that: BCWT001 = 0 for every valid grid cell that I checked. Initially, I observed this over the HKH region, but I subsequently checked the variable over the global MERRA-2 domain, and BCWT001 appears to remain zero everywhere. BCWT002, in contras...

I am working with NASA MERRA-2 aerosol diagnostic data to calculate long-term black carbon (BC) deposition over the Hindu Kush Himalaya (HKH) region. I would appreciate clarification regarding which MERRA-2 variables should be combined to calculate total BC deposition. Data product: MERRA-2 tavgM_2d...