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)
E01 SUNA - Nitrate Observations Corrected
Unknown
tabular digital data
Portsmouth, NH, USA
ERDDAP, version 1.82, at NERACOOS
http://www.neracoos.org/erddap/tabledap/E01_corrected_nitrate_csv.html
http://www.neracoos.org/erddap/tabledap/E01_corrected_nitrate_csv.graph
http://www.neracoos.org/erddap/tabledap/E01_corrected_nitrate_csv.subset
University of Maine School of Marine Sciences
Nitrate SUNA V2 sensors (Sea-Bird Scientific) were deployed on NERACOOS Buoy E (Latitude: 43 deg 42.87'N and Longitude: 69 deg 21.36'W) at 50m from June 6, 2015 to November 26, 2018. This time period corresponds to University of Maine buoy deployments E0133, E0134, E0135, E0136, E0137 and E0138 (http://gyre.umeoce.maine.edu/data/gomoos/buoy/html/E01.html). The sensors were programmed to collect nitrate measurements three times per day (0045, 0845 and 1645 GMT) and more recently, eight times day (0045, 0345, 0645, 0945, 1245, 1545, 1845, and 2145 GMT) over a fixed sampling window of 30 seconds at approximately 1.4 readings per second. 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 2uM, the values were eliminated. Surviving data were then quality controlled (QCed) by removing outliers assessed as values less than -0.5uM and greater than 15uM. Whenever possible at the time of buoy deployment and recovery, a standard CTD cast was conducted with a carrousel water sampler equipped with Niskin bottles. Ground truth water samples were collected at the same depth as the nitrate sensor. 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 uM. Upon recovery of the instruments, the data was processed using the software provided by Sea-Bird (UCI) 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, University of Maine, School of Marine Sciences if you have any questions.
Unknown
http://www.neracoos.org/nutrientobservatory
20150606
20181126
ground condition
As needed
-69.35598
-69.35598
43.714493
43.714493
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/E01_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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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.