ERDDAP > info > M01_corrected_nitrate_csv

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	Institution	Dataset ID
	set	data	graph			M01 SUNA - Nitrate Observations Corrected		F   I   M	background		University of Mai...	M01_corrected_nitrate_csv

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	cdm_data_type	String	Point
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3
attribute	NC_GLOBAL	creator_email	String	davidt at maine.edu
attribute	NC_GLOBAL	creator_name	String	David Townsend
attribute	NC_GLOBAL	creator_url	String	https://umaine.edu/marine/
attribute	NC_GLOBAL	defaultGraphQuery	String	time,Nitrate_umol&time%3E=max(time)-7days&depth=50&.draw=lines&.color=0x000000
attribute	NC_GLOBAL	Easternmost_Easting	double	-67.8798
attribute	NC_GLOBAL	featureType	String	Point
attribute	NC_GLOBAL	geospatial_lat_max	double	43.491
attribute	NC_GLOBAL	geospatial_lat_min	double	43.4907
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-67.8798
attribute	NC_GLOBAL	geospatial_lon_min	double	-67.88
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	geospatial_vertical_max	double	250.0
attribute	NC_GLOBAL	geospatial_vertical_min	double	1.0
attribute	NC_GLOBAL	geospatial_vertical_positive	String	down
attribute	NC_GLOBAL	geospatial_vertical_units	String	m
attribute	NC_GLOBAL	infoUrl	String	http://www.neracoos.org/nutrientobservatory
attribute	NC_GLOBAL	institution	String	University of Maine School of Marine Sciences
attribute	NC_GLOBAL	keywords	String	buoy, chemistry, concentration, data, day, depth, desc, deviation, dissolved, dissolved nutrients, e01, earth, Earth Science > Oceans > Ocean Chemistry > Nitrate, hour, identifier, latitude, longitude, maine, minute, mole, mole_concentration_of_nitrate_in_sea_water, month, mooring, mooring_site_desc, n02, nitrate, Nitrate_moles_m_3, Nitrate_umol, no3, nutrients, ocean, oceans, science, sea, seawater, second, site, standard, Standard_Deviation, station, statistics, suna, time, two, umol, university, water, water_depth, year
attribute	NC_GLOBAL	keywords_vocabulary	String	GCMD Science Keywords
attribute	NC_GLOBAL	license	String	The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.
attribute	NC_GLOBAL	neracoos_data_provider	String	UMO
attribute	NC_GLOBAL	Northernmost_Northing	double	43.491
attribute	NC_GLOBAL	publisher_email	String	info at neracoos.org
attribute	NC_GLOBAL	publisher_name	String	Northeastern Regional Association of Coastal and Ocean Observing Systems (NERACOOS)
attribute	NC_GLOBAL	publisher_phone	String	(603) 319-1785
attribute	NC_GLOBAL	publisher_url	String	http://www.neracoos.org/
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	43.4907
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v29
attribute	NC_GLOBAL	subsetVariables	String	Year, depth
attribute	NC_GLOBAL	summary	String	Various nitrate sensors including the SUNA V1, SUNA V2 and ISUS (Sea-Bird Scientific) were deployed on NERACOOS Buoy M (Latitude: 43° 29.44'N and Longitude: 67° 52.79'W) from June 23, 2013 to March 23, 2021. This time period corresponds to University of Maine buoy deployments M0124, M0125, M0126, M0127, M0129, and M130 (http://gyre.umeoce.maine.edu/data/gomoos/buoy/html/M01.html). These sensors were placed at the surface, 1m, 50m, 100m, 150m and 250m and programmed to collect nitrate measurements six times per day (0045, 0445, 0845, 1245, 1645 and 2045 GMT) over a fixed sampling window of 30 seconds at approximately 1.4 readings per second. The number of sensors and their depths varied for each deployment depending on the number of available sensors. Five measurements recorded in the middle of the 30 second data stream were transmitted back to the University of Maine Physical Oceanography Group via cell phone. The mean concentration and standard deviation were calculated for each specific sampling time. If the standard deviation for a mean was greater than 2µM, the values were eliminated. Surviving data were then quality controlled (QCed) by removing outliers assessed as values less than -0.5µM and greater than 30µM. Whenever possible at the time of buoy deployment and recovery, a standard CTD cast was conducted with a carousel water sampler equipped with Niskin bottles. Ground truth water samples were collected at the same depth as the nitrate sensors. These samples were analyzed for nitrate concentrations at the University of Maine using a Bran Luebbe AA3 Autoanalyzer and standard techniques. Ground truth corrections were added or subtracted as an offset only if the difference between the nitrate concentration of the water sample collected and the mean nitrate sensor reading at approximately the same time was greater than 2 µM. Upon recovery of the instruments, the data was processed using the software provided by Sea-Bird (UCI.com) and compared with the real-time measurements as a check for accuracy. In the event that the sensor was not able to transmit in real-time, the processed data was QCed. Please contact David Townsend, [email protected], University of Maine, School of Marine Sciences if you have any questions.
attribute	NC_GLOBAL	testOutOfDate	String	now-121days
attribute	NC_GLOBAL	time_coverage_end	String	2021-03-24T00:45:00Z
attribute	NC_GLOBAL	time_coverage_start	String	2013-06-23T16:45:00Z
attribute	NC_GLOBAL	title	String	M01 SUNA - Nitrate Observations Corrected
attribute	NC_GLOBAL	Westernmost_Easting	double	-67.88
variable	station		String
attribute	station	ioos_category	String	Identifier
attribute	station	long_name	String	Station
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	1.3720059E9, 1.6165467E9
attribute	time	axis	String	T
attribute	time	ioos_category	String	Time
attribute	time	long_name	String	Time
attribute	time	standard_name	String	time
attribute	time	time_origin	String	01-JAN-1970 00:00:00
attribute	time	units	String	seconds since 1970-01-01T00:00:00Z
variable	Year		short
attribute	Year	actual_range	short	2013, 2021
attribute	Year	ioos_category	String	Time
attribute	Year	long_name	String	Year
variable	Month		byte
attribute	Month	actual_range	byte	1, 12
attribute	Month	ioos_category	String	Time
attribute	Month	long_name	String	Month
variable	Day		byte
attribute	Day	actual_range	byte	1, 31
attribute	Day	ioos_category	String	Time
attribute	Day	long_name	String	Day
variable	Hour		byte
attribute	Hour	actual_range	byte	0, 20
attribute	Hour	ioos_category	String	Time
attribute	Hour	long_name	String	Hour
variable	Minute		byte
attribute	Minute	actual_range	byte	44, 45
attribute	Minute	ioos_category	String	Time
attribute	Minute	long_name	String	Minute
variable	Second		byte
attribute	Second	actual_range	byte	0, 0
attribute	Second	ioos_category	String	Time
attribute	Second	long_name	String	Second
variable	Nitrate_umol		float
attribute	Nitrate_umol	actual_range	float	-0.484, 24.93
attribute	Nitrate_umol	colorBarMaximum	double	50.0
attribute	Nitrate_umol	colorBarMinimum	double	0.0
attribute	Nitrate_umol	ioos_category	String	Dissolved Nutrients
attribute	Nitrate_umol	long_name	String	Mole Concentration Of Nitrate In Sea Water
attribute	Nitrate_umol	standard_name	String	mole_concentration_of_nitrate_in_sea_water
attribute	Nitrate_umol	units	String	umol
variable	Standard_Deviation		float
attribute	Standard_Deviation	actual_range	float	0.0, 1.998
attribute	Standard_Deviation	colorBarMaximum	double	50.0
attribute	Standard_Deviation	colorBarMinimum	double	0.0
attribute	Standard_Deviation	ioos_category	String	Statistics
attribute	Standard_Deviation	long_name	String	Standard Deviation(umol)
variable	Nitrate		float
attribute	Nitrate	actual_range	float	-4.84E-4, 0.045
attribute	Nitrate	colorBarMaximum	double	50.0
attribute	Nitrate	colorBarMinimum	double	0.0
attribute	Nitrate	ioos_category	String	Dissolved Nutrients
attribute	Nitrate	long_name	String	Mole Concentration Of Nitrate In Sea Water
attribute	Nitrate	standard_name	String	mole_concentration_of_nitrate_in_sea_water
attribute	Nitrate	units	String	mol m-3
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	actual_range	double	43.4907, 43.491
attribute	latitude	axis	String	Y
attribute	latitude	colorBarMaximum	double	90.0
attribute	latitude	colorBarMinimum	double	-90.0
attribute	latitude	ioos_category	String	Location
attribute	latitude	long_name	String	Latitude
attribute	latitude	standard_name	String	latitude
attribute	latitude	units	String	degrees_north
variable	longitude		double
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	actual_range	double	-67.88, -67.8798
attribute	longitude	axis	String	X
attribute	longitude	colorBarMaximum	double	180.0
attribute	longitude	colorBarMinimum	double	-180.0
attribute	longitude	ioos_category	String	Location
attribute	longitude	long_name	String	Longitude
attribute	longitude	standard_name	String	longitude
attribute	longitude	units	String	degrees_east
variable	mooring_site_desc		String
attribute	mooring_site_desc	ioos_category	String	Location
attribute	mooring_site_desc	long_name	String	Mooring Site Desc
variable	depth		short
attribute	depth	_CoordinateAxisType	String	Height
attribute	depth	_CoordinateZisPositive	String	down
attribute	depth	actual_range	short	1, 250
attribute	depth	axis	String	Z
attribute	depth	colorBarMaximum	double	8000.0
attribute	depth	colorBarMinimum	double	-8000.0
attribute	depth	colorBarPalette	String	TopographyDepth
attribute	depth	ioos_category	String	Location
attribute	depth	long_name	String	Depth
attribute	depth	positive	String	down
attribute	depth	standard_name	String	depth
attribute	depth	units	String	m
variable	water_depth		float
attribute	water_depth	actual_range	float	285.0, 285.0
attribute	water_depth	ioos_category	String	Location
attribute	water_depth	long_name	String	Water Depth
attribute	water_depth	units	String	m

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.