Conversion Factors, Datums, and Abbreviations and Acronyms

Conversion Factors

Multiply	By	To obtain
Length
centimeter (cm)	0.3937	inch (in)
kilometer (km)	0.6214	mile (mi)
meter (m)	3.281	foot (ft)
meter (m)	1.094	yard (yd)
Volume
liter (L)	0.2642	gallon (gal)
cubic meter (m3)	264.2	gallon (gal)
cubic meter (m3)	35.31	cubic foot (ft3)
cubic meter (m3)	0.0008107	acre-foot (acre-ft)

Concentrations of chemical constituents in water are given in milligrams per liter (mg/L) or micrograms per liter (µg/L).

Datum

Vertical coordinate information is referenced to the National Geodetic Vertical Datum of 1929 (NGVD29).

Abbreviations and Acronyms

δ15N	delta nitrogen-15
δ18O	delta oxygen-18
‰	parts per thousand
δ2H	delta hydrogen-2
3H/3He	ratio of hydrogen-3 to helium-3
3H	hydrogen-3
3He	helium-3
δ3He	delta helium-3
4He	helium-4
N2	nitrogen gas
Ne	neon
NH4	ammonium
NO3	nitrogen
mm	micrometer
EMMA	End-member mixing analysis
PCA	principal component analysis
SLAP	Standard Light Antarctic Precipitation
VSMOW	Vienna Standard Mean Ocean Water