_id	Variable in file	Common Name	Description	Units
1	Sample date (YYYY-MM-DD)	Date	Sample date	""
2	Depth	Depth	Sample depth	m
3	Salinity	Salinity	Sea ice salinity is the salt content of sea ice, often on the Practical Salinity Scale of 1978.	psu
4	Gaseous Hg	Gaseous Mercury	The concentration of mercury in the gaseous form, including elemental mercury and dimethylmercury	fM
5	Total Hg	Total Mercury	The concentration of all mercury species that can be oxidized by Bromine monochloride (BrCl)	pM