## PM 2.5 unit conversion from kg/m3 to kg/m2

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dinesh_5497
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### PM 2.5 unit conversion from kg/m3 to kg/m2

I have data from merra 2 for sea salt mass concentration, the unit is kg/m3 , i need it in kg/m2 for my application. I like value for length scale which needs to multipled to it. How to find a length scale for specific location.

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### Re: PM 2.5 unit conversion from kg/m3 to kg/m2

Hello,

A MERRA-2 subject matter expert will respond soon.

Regards,

mbosilov
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### Re: PM 2.5 unit conversion from kg/m3 to kg/m2

dinesh_5497 wrote: Sat Mar 09, 2024 10:55 am America/New_York I have data from merra 2 for sea salt mass concentration, the unit is kg/m3 , i need it in kg/m2 for my application. I like value for length scale which needs to multipled to it. How to find a length scale for specific location.

mbosilov
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Joined: Thu Apr 16, 2020 9:03 am America/New_York
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### Re: PM 2.5 unit conversion from kg/m3 to kg/m2

dinesh_5497 wrote: Sat Mar 09, 2024 10:55 am America/New_York I have data from merra 2 for sea salt mass concentration, the unit is kg/m3 , i need it in kg/m2 for my application. I like value for length scale which needs to multipled to it. How to find a length scale for specific location.
Hi, I am assuming that you are using a variable SSSMASS25. The surface layer height varies in space and time. You can find HLML (Height of the lowest model layer, units m) in tavg1_2d_flx_Nx (M2T1NXFLX): Surface Flux Diagnostics. I hope that helps.

dinesh_5497
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### Re: PM 2.5 unit conversion from kg/m3 to kg/m2

Based on your answer, i need to download HLML from tavg1_2d_flx_Nx (M2T1NXFLX) and multiply with the SSSMASS.