Trace elements: Units and Downsampling

For trace element data, which unit would you consider as standard?

mass unit (eg. ng/g, ng etc.)

amount of substance unit (eg. mmol/mol, mol etc.)

Other

Clear selection

Please add any comments regarding trace element units here:

For trace element data that is generated at a higher resolution to stable isotope data from the same speleothem sample, which methods do you use for downsampling? Please can you briefly describe this below. (e.g. Interpolation with different settings for weighting and smoothening, some functions in Python, MATLAB etc...)