Circulation in the Freshwater Switchyard of the Arctic Ocean: University of Washington CTD Profile Data https://data.eol.ucar.edu/dataset/106.ARCSS129 Summary The Freshwater Switchyard of the Arctic Ocean (FSAO) project is a program to study freshwater circulation (sea ice and upper ocean) in the "freshwater switchyard" between Alert (Ellesmere Island) and the North Pole, through a series of annual springtime hydrographic surveys. An aircraft based at Alert on northern Ellesmere Island carries out the oceanographic surveys northward across the shelf break in late spring. These surveys are intended to measure the eastward-flowing boundary current and determine water property changes that occur in the transition from the deep Arctic Ocean basin to the shallow continental shelf. Measurements were made to 500m in late April and May of 2003-2009 using a Seabird Sea-Bird Electronics (SBE) 19plus SeaCAT internally recording CTD instrument with an Sea-Bird Electronics (SBE) 43 dissolved oxygen sensor. Data include depth, pressure, temperature in situ, potential temperature, conductivity, salinity, density and, if available, dissolved oxygen. In recent years, we have begun offering dissolved oxygen profiles in a separate archive to allow a different processing pathway. The basic CTD archives are preferred for all purposes that do not require oxygen. Through 2007, the aircraft was a Bell 206 helicopter. In April-May 2007, the worst Arctic flying weather in many years was encountered, negatively impacting many investigations. At Alert, a very wide shore lead evaporating ice fog never relented long enough to allow the helicopter to safely reach the study areas, so no data is included for 2007. In 2008, we used a Twin Otter skiplane to obtain many stations, at a cost of not being able to reach precise station positions from previous years. The 2009 data used primary Sea-Bird Electronics (SBE)-19 plus CTD (s/n 4344) was an Sea-Bird Electronics (SBE)-43 Dissolved Oxygen Sensor (s/n 408). Beginning with Cast 8, backup Sea-Bird Electronics (SBE)-19 (s/n 2373) with Sea-Bird Electronics (SBE)-43 (s/n 1406) was substituted, and that station recorded an excellent profile of oxygen as well as temperature and conductivity. The backup CTD itself failed completely at the first station the following day, for reasons under investigation by the manufacturer. At that point it was felt the safest course was to complete the survey removing the Sea-Bird Electronics (SBE)-43 from the primary CTD, to optimize our chances of collecting good CTD data. The result is 18 stations of quality CTD profiles, but only one (Cast 8) with oxygen. In 2010, Airborne Expendable CTD Probes were dropped into open leads from the Twin to record an ocean section across the north end of Nares Strait. Identifiers * Local archive identifier: 106.ARCSS129 * doi:10.5065/D63N21H9 https://doi.org/10.5065/D63N21H9 Versions 1.0 Citation Steele, M., Steele, M. 2010. Circulation in the Freshwater Switchyard of the Arctic Ocean: University of Washington CTD Profile Data. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. https://doi.org/10.5065/D63N21H9 Accessed 25 Nov 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 NSF 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: criteria * Language: English Grant Code 0230427 ISO Topic Categories * oceans Categories * Aircraft * Arctic * CTD ocean cast * Hydrography * Oceanography * Water Sampling Platforms * Helicopter Instruments * Conductivity, Temperature, Depth - CTD GCMD Science Keywords * EARTH SCIENCE > OCEANS > SALINITY/DENSITY > CONDUCTIVITY * EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY * EARTH SCIENCE > OCEANS > OCEAN PRESSURE > WATER PRESSURE * EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN * EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE * EARTH SCIENCE > OCEANS > SALINITY/DENSITY > DENSITY Documentation * index.html [25 KiB] https://data.eol.ucar.edu/file/download/41CF4E91DFB/index.html * readme.txt [5 KiB] https://data.eol.ucar.edu/file/download/41CF44E52FD/readme.txt Related links * homepage: ARCSS EOL Webpage https://www.eol.ucar.edu/field_projects/arcss * info: Freshwater Switchyard of the Arctic Ocean http://psc.apl.washington.edu/switchyard/index.html * download: NSF Arctic Data Center https://doi.org/10.5065/D63N21H9 * info: ARCSS Data Policy https://data.eol.ucar.edu/arctic_projects/arcss/Data_Policy.html Temporal coverage * Begin datetime: 2003-05-06 00:00:00 * End datetime: 2010-05-17 23:59:59 Spatial coverage * Maximum (North) Latitude: 84.66389 * Minimum (South) Latitude: 82.207 * Minimum (West) Longitude: -66.23889 * Maximum (East) Longitude: -56.00139 Primary contact information * pointOfContact: Michael Steele https://data.eol.ucar.edu/contact/show/224 Additional contact information * author: Michael Steele https://data.eol.ucar.edu/contact/show/224 * originator: Michael Steele https://data.eol.ucar.edu/contact/show/224 * principalInvestigator: Michael Steele https://data.eol.ucar.edu/contact/show/224 Alternate metadata formats * DataCite: https://data.eol.ucar.edu/dataset/106.ARCSS129?format=datacite * ISO/TC 211: https://data.eol.ucar.edu/dataset/106.ARCSS129?format=isotc211