Identification

Title

North Pole Environmental Observatory (NPEO) Nutrient, Chlorophyll, and Hydrographic Profiles

Alternative title(s)

106.215

Abstract

This project began an evaluation of nutrients and phytoplankton standing stocks in the central Arctic Ocean based on sampling at the North Pole Environmental Observatory (NPEO). The first sampling occurred in April 2005, the second in April 2006, where eight vertical profiles of hydrographic properties (salinity, temperature, sigma-t), in-situ fluorescence, and nutrients in the region of the NPEO were determined. Vertical profiles of hydrographic, fluorescence, and nutrients over the upper 150 m were obtained using a Sea-Bird SBE-19 CTD (serial number 1923347-2995) combined with a Wetstar model WS3S miniature flow-through fluorometer (serial number 646P), which had an excitation wavelength of 460 nm and an emission wavelength of 695 nm. The continuous CTD profiles were processed using standard SeaSoft software with the results being binned into 0.5 m depth intervals. The fluorometer was calibrated in the laboratory with aqueous solutions of resorufin (Christensen, 2006a). The fluorescence of resorufin was compared with the fluorescence of purified chlorophyll-a (from the algae Anacystis nidulans) dissolved in buffered acetone (10 ml of 1% (weight per volume) magnesium carbonate per L of 90% acetone). These chlorophyll solutions showed a fluorescence of 40.0 times that of resorufin for the same molar concentrations. The output of the fluorometer was first converted to fluorescence of resorufin (mmol/L) and then to that of chlorophyll-a (expressed in microgram-chl/L) using this factor and the molecular weight of chlorophyll-a (893.5 g/mole).

Resource type

dataset

Resource locator

https://data.eol.ucar.edu//dataset/106.215

protocol: https

name: North Pole Environmental Observatory (NPEO) Nutrient, Chlorophyll, and Hydrographic Profiles homepage

description: Dataset homepage

Unique resource identifier

code

106.215

codeSpace

Dataset language

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

oceans

Keywords

Keyword set

keyword value

dataset

originating controlled vocabulary

title

Resource Type

reference date

date type

revision

effective date

2014-10-16

Keyword set

keyword value

Fixed Observation Stations

Keyword set

keyword value

Oceanography

Arctic

Biology

Ship Based

Keyword set

keyword value

EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > INORGANIC MATTER

EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE

EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE

EARTH SCIENCE > OCEANS > SALINITY/DENSITY > DENSITY

EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > AMMONIA

EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NUTRIENTS

EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SILICATE

EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > STABLE ISOTOPES

EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRITE

EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PHOSPHATE

EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN

EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALT TRANSPORT

EARTH SCIENCE > OCEANS > OCEAN PRESSURE > WATER PRESSURE

EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL

EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITROGEN

originating controlled vocabulary

title

Global Change Master Directory (GCMD)

reference date

date type

revision

effective date

2018-02-27

Geographic location

West bounding longitude

-180.00000

East bounding longitude

180.00000

North bounding latitude

90.00000

South bounding latitude

88.50000

Temporal reference

Temporal extent

Begin position

2005-04-18T00:00:00Z

End position

2006-04-22T23:59:59Z

Dataset reference date

date type

publication

effective date

2009-06-18T10:01:03Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

none

Limitations on public access

none

Responsible organisations

Responsible party

contact position

EOL Data Support

organisation name

UCAR/NCAR - Earth Observing Laboratory

full postal address

PO Box 3000

Boulder

80307-3000

email address

datahelp@eol.ucar.edu

web address

https://data.eol.ucar.edu/

name: homepage

responsible party role

pointOfContact

Responsible party

organisation name

Bigelow Laboratory for Ocean Sciences

full postal address

180 McKown Point

West Boothbay Harbor

04575

email address

jchristensen@bigelow.org

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

contact position

EOL Data Support

organisation name

UCAR/NCAR - Earth Observing Laboratory

full postal address

PO Box 3000

Boulder

80307-3000

email address

datahelp@eol.ucar.edu

web address

https://data.eol.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata date

2024-02-07T22:48:33Z

Metadata language

eng; USA