cov2cf return with w/m2

[LiangChen3519]

Hi, this is super useful package to play with raw flux data. Thanks for your efforts. But, when I read the document, I found that, the unit for C flux is W/m2, which is a energy unit, So, I was wondering, which is the right unit after applied the cov2cf function,

Thank you in advance.

[noctiluc3nt]

Thank you for your comment.

The units for the flux are like this: formula: CO2 flux = air density * cov(w,c) units: kg/(m² s) = kg/m³ m/s kg/kg

So the flux is in the end in kg/(m² s), when you have given c as a mixing ratio [kg/kg] and vertical wind [m/s] and air density [kg/m³]. As the CO2 flux is usually not taken into account in the surface energy balance, it does not necessarily have to be in W/m². I updated the documentation accordingly.