North Pole Environmental Observatory (NPEO) Nutrient, Chlorophyll, and Hydrographic Profiles https://data.eol.ucar.edu/dataset/106.215 Summary 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). Identifiers * Local archive identifier: 106.215 * doi:10.5065/D6D798JZ https://doi.org/10.5065/D6D798JZ Versions 1.0 Citation Christensen, J., Pegau, S., Christensen, J. 2009. North Pole Environmental Observatory (NPEO) Nutrient, Chlorophyll, and Hydrographic Profiles. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. https://doi.org/10.5065/D6D798JZ Accessed 25 Apr 2024. Additional citation styles can be generated by entering the DOI at CrossCite (https://citation.crosscite.org/). Acknowledgement In addition to the citation reference and any other acknowledgements, please acknowledge NCAR/EOL in your publications with text such as: Data provided by NCAR/EOL under the sponsorship of the National Science Foundation. https://data.eol.ucar.edu/ Related projects * ARCSS: NSF Arctic System Science https://data.eol.ucar.edu/project/ARCSS Additional information * Spatial Type: point * Frequency: continuous * Language: English Grant Code 0352641, 0352656 ISO Topic Categories * oceans Categories * Arctic * Biology * Oceanography * Ship Based Platforms * Fixed Observation Stations Instruments * Conductivity, Temperature, Depth - CTD * Fluorometers * Niskin bottles Sites * NPEO GCMD Science Keywords * EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN * EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL * EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALT TRANSPORT * EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PHOSPHATE * EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE * EARTH SCIENCE > OCEANS > OCEAN PRESSURE > WATER PRESSURE * EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITROGEN * EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NUTRIENTS * EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SILICATE * EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > INORGANIC MATTER * EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRITE * EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE * EARTH SCIENCE > OCEANS > SALINITY/DENSITY > DENSITY * EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > STABLE ISOTOPES * EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > AMMONIA Documentation * NPB05DOC.PDF [86 KiB] https://data.eol.ucar.edu/file/download/41B014DE888/NPB05DOC.PDF * NPB06DOC.PDF [81 KiB] https://data.eol.ucar.edu/file/download/41B014DE889/NPB06DOC.PDF Related links * info: ARCSS Data Policy https://data.eol.ucar.edu/arctic_projects/arcss/Data_Policy.html * download: NSF Arctic Data Center https://doi.org/10.5065/D6D798JZ * homepage: ARCSS EOL Webpage https://www.eol.ucar.edu/field_projects/arcss Temporal coverage * Begin datetime: 2005-04-18 00:00:00 * End datetime: 2006-04-22 23:59:59 Spatial coverage * Maximum (North) Latitude: 90.00 * Minimum (South) Latitude: 88.50 * Minimum (West) Longitude: -180.00 * Maximum (East) Longitude: 180.00 Primary contact information * pointOfContact: John P. Christensen https://data.eol.ucar.edu/contact/show/682 Additional contact information * author: John P. Christensen https://data.eol.ucar.edu/contact/show/682 * author: Scott Pegau https://data.eol.ucar.edu/contact/show/233 * principalInvestigator: Scott Pegau https://data.eol.ucar.edu/contact/show/233 * originator: John P. Christensen https://data.eol.ucar.edu/contact/show/682 * principalInvestigator: John P. Christensen https://data.eol.ucar.edu/contact/show/682 Alternate metadata formats * DataCite: https://data.eol.ucar.edu/dataset/106.215?format=datacite * ISO/TC 211: https://data.eol.ucar.edu/dataset/106.215?format=isotc211