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ERDDAP > info > M01_corrected_nitrate_csv

Title Sum-
RSS Institution Dataset ID
   set  data   graph     M01 SUNA - Nitrate Observations Corrected    ?   F   I   M   background RSS
University of Mai...  ?

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
attribute NC_GLOBAL creator_name String David Townsend
attribute NC_GLOBAL creator_url String (external link)
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
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
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
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 ( 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 ( 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.

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