M01_corrected_nitrate_csv eng UTF8 dataset service Ru Morrison NERACOOS 603-319-1785 195 New Hampshire Ave. Portsmouth NH 03801 USA info@neracoos.org pointOfContact 2026-03-31 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) 4 column row vertical temporal M01 SUNA - Nitrate Observations Corrected 2026-03-31 creation www.neracoos.org M01_corrected_nitrate_csv David Townsend University of Maine School of Marine Sciences davidt@maine.edu http://www.neracoos.org/nutrientobservatory information web browser Background Information Background information from the source information originator 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, davidt@maine.edu, University of Maine, School of Marine Sciences if you have any questions. David Townsend University of Maine School of Marine Sciences davidt@maine.edu http://www.neracoos.org/nutrientobservatory information web browser Background Information Background information from the source information pointOfContact buoy chemistry concentration data day desc deviation dissolved dissolved nutrients e01 earth hour identifier maine minute mole month mooring n02 nitrate no3 nutrients ocean oceans science sea seawater second site standard station statistics suna two umol university water year theme Earth Science > Oceans > Ocean Chemistry > Nitrate theme GCMD Science Keywords University of Maine School of Marine Sciences project time mole_concentration_of_nitrate_in_sea_water mole_concentration_of_nitrate_in_sea_water latitude longitude depth theme CF Standard Name Table v29 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. University of Maine School of Marine Sciences largerWorkCitation project Unidata Common Data Model Point largerWorkCitation project eng geoscientificInformation 1 -67.88 -67.8798 43.4907 43.491 seconds 2013-06-23T16:45:00Z 2021-03-24T00:45:00Z -250.0 -1.0 M01 SUNA - Nitrate Observations Corrected 2026-03-31 creation David Townsend University of Maine School of Marine Sciences davidt@maine.edu http://www.neracoos.org/nutrientobservatory information web browser Background Information Background information from the source information originator 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, davidt@maine.edu, University of Maine, School of Marine Sciences if you have any questions. ERDDAP tabledap 1 -67.88 -67.8798 43.4907 43.491 seconds 2013-06-23T16:45:00Z 2021-03-24T00:45:00Z -250.0 -1.0 tight ERDDAPtabledapDatasetQueryAndAccess http://www.neracoos.org/erddap/tabledap/M01_corrected_nitrate_csv ERDDAP:tabledap ERDDAP-tabledap ERDDAP's tabledap service (a flavor of OPeNDAP) for tabular (sequence) data. Add different extensions (e.g., .html, .graph, .das, .dds) to the base URL for different purposes. download M01 SUNA - Nitrate Observations Corrected 2026-03-31 creation David Townsend University of Maine School of Marine Sciences davidt@maine.edu http://www.neracoos.org/nutrientobservatory information web browser Background Information Background information from the source information originator 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, davidt@maine.edu, University of Maine, School of Marine Sciences if you have any questions. OPeNDAP 1 -67.88 -67.8798 43.4907 43.491 seconds 2013-06-23T16:45:00Z 2021-03-24T00:45:00Z -250.0 -1.0 tight OPeNDAPDatasetQueryAndAccess http://www.neracoos.org/erddap/tabledap/M01_corrected_nitrate_csv OPeNDAP:OPeNDAP OPeNDAP An OPeNDAP service for tabular (sequence) data. Add different extensions (e.g., .html, .das, .dds) to the base URL for different purposes. download M01 SUNA - Nitrate Observations Corrected 2026-03-31 creation David Townsend University of Maine School of Marine Sciences davidt@maine.edu http://www.neracoos.org/nutrientobservatory information web browser Background Information Background information from the source information originator 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, davidt@maine.edu, University of Maine, School of Marine Sciences if you have any questions. ERDDAP Subset 1 -67.88 -67.8798 43.4907 43.491 seconds 2013-06-23T16:45:00Z 2021-03-24T00:45:00Z -250.0 -1.0 tight ERDDAP_Subset http://www.neracoos.org/erddap/tabledap/M01_corrected_nitrate_csv.subset search Subset Web page to facilitate selecting subsets of the dataset download physicalMeasurement station String Station time double Time Year short Year Month byte Month Day byte Day Hour byte Hour Minute byte Minute Second byte Second Nitrate_umol float Mole Concentration Of Nitrate In Sea Water Standard_Deviation float Standard Deviation(umol) Nitrate float Mole Concentration Of Nitrate In Sea Water mooring_site_desc String Mooring Site Desc water_depth float Water Depth Ru Morrison NERACOOS 603-319-1785 195 New Hampshire Ave. Portsmouth NH 03801 USA info@neracoos.org distributor OPeNDAP DAP/2.0 http://www.neracoos.org/erddap/tabledap/M01_corrected_nitrate_csv.html order Data Subset Form ERDDAP's version of the OPeNDAP .html web page for this dataset. Specify a subset of the dataset and download the data via OPeNDAP or in many different file types. download http://www.neracoos.org/erddap/tabledap/M01_corrected_nitrate_csv.graph order Make-A-Graph Form ERDDAP's Make-A-Graph .html web page for this dataset. Create an image with a map or graph of a subset of the data. mapDigital This record was created from dataset metadata by ERDDAP Version 1.82