Project: University of Maine School of Marine Sciences
Name: David Townsend
Email: davidt@maine.edu
Institution: University of Maine School of Marine Sciences
InfoURL: http://www.neracoos.org/nutrientobservatory
Source URL: (local files)
M01 SUNA - Nitrate Observations Corrected
Unknown
tabular digital data
Portsmouth, NH, USA
ERDDAP, version 1.82, at NERACOOS
http://www.neracoos.org/erddap/tabledap/M01_corrected_nitrate_csv.html
http://www.neracoos.org/erddap/tabledap/M01_corrected_nitrate_csv.graph
http://www.neracoos.org/erddap/tabledap/M01_corrected_nitrate_csv.subset
University of Maine School of Marine Sciences
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.
Unknown
http://www.neracoos.org/nutrientobservatory
20130623
20210324
ground condition
As needed
-67.88
-67.8798
43.491
43.4907
GCMD Science Keywords
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
CF Standard Name Table v29
time
mole_concentration_of_nitrate_in_sea_water
mole_concentration_of_nitrate_in_sea_water
latitude
longitude
depth
None.
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
David Townsend
Unknown
Mailing and Physical Address
Unknown
Unknown
Unknown
Unknown
Unknown
Unknown
davidt@maine.edu
http://www.neracoos.org/erddap/tabledap/M01_corrected_nitrate_csv.graph
Web page to make a customized map or graph of the data
HTML
Unknown
Unknown
Unknown
Unknown
Unknown
Unknown
Point
Point
NERACOOS
Ru Morrison
Exectutive Director
Mailing and Physical Address
195 New Hampshire Ave.
Portsmouth
NH
03801
USA
603-319-1785
info@neracoos.org
ERDDAP, version 1.82: get metadata; download data; make graphs and maps.
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.
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.kml
1
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None
20240318
NERACOOS
Ru Morrison
Exectutive Director
Mailing and Physical Address
195 New Hampshire Ave.
Portsmouth
NH
03801
USA
603-319-1785
info@neracoos.org
Content Standard for Digital Geospatial Metadata
FGDC-STD-012-2002
universal time
None.
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.