attributes_nes-lter-nutrient-transect.txt

attributeName	attributeDefinition	class	unit	dateTimeFormatString	missingValueCode	missingValueCodeExplanation
cruise	Identifier for research cruise generally including abbreviation for research vessel and voyage number	character				
cast	CTD rosette cast number chronological per cruise	numeric	dimensionless		NaN	Missing value
niskin	Rosette bottle position number	numeric	dimensionless		NaN	Missing value
date_time_utc	Date and time in UTC when rosette bottle closed	Date		YYYY-MM-DD hh:mm:ss		
latitude	Ship's latitude when rosette bottle closed	numeric	degree		NaN	Missing value
longitude	Ship's longitude when rosette bottle closed	numeric	degree		NaN	Missing value
depth	Depth of sample below sea surface. URI http://vocab.nerc.ac.uk/collection/P09/current/DEPH/	numeric	meter		NaN	Missing value
sample_id	Identifier for subsample drawn from rosette bottle	numeric	dimensionless		NaN	Missing value
replicate	Lowercase letter indicating replicate subsample drawn from the same rosette bottle	character				
nitrate_nitrite	Nitrate+nitrite concentration in the water column http://vocab.nerc.ac.uk/collection/P02/current/NTRA/	numeric	micromolePerLiter		NaN	Missing value
ammonium	Ammonium concentration in the water column http://vocab.nerc.ac.uk/collection/P02/current/AMON/	numeric	micromolePerLiter		NaN	Missing value
phosphate	Phosphate concentration in the water column http://vocab.nerc.ac.uk/collection/P02/current/PHOS/	numeric	micromolePerLiter		NaN	Missing value
silicate	Silicate concentration in the water column http://vocab.nerc.ac.uk/collection/P02/current/SLCA/	numeric	micromolePerLiter		NaN	Missing value
alternate_sample_id	Sample identifier for project other than LTER	character				
project_id	Identifier for project that funded the cruise (or sample when available)	categorical				
nearest_station	Nearest station is provided per cruise	character				
station_distance	Distance from sample location to nearest station	numeric	kilometer		NaN	Distance to nearest station is greater than 2 km