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This dataset contains salinity-calibrated Conductivity Temperature Depth (CTD) and bottle data from the 2021 Ocean Observatories Initiative (OOI) Irminger Sea 8 cruise of the research vessel Neil Armstrong (AR60-01). Data quality control methods have been used to assess performance of the CTD instrument. Resulting high-quality profiles were then used together with salinity bottle data analyzed at sea to create a post-cruise salinity-calibrated CTD product. This submission has been produced as part of an ongoing effort to more fully utilize CTD data collected by OOI Irminger cruises, which have been taking place annually since 2014. The hydrographic data collection facilitated by OOI in the Irminger Sea currently supports science for not only OOI end users, but also international oceanographic research projects, including the Overturning in the Subpolar North Atlantic Program (https://www.o-snap.org/), Atlantic Meridional Overturning Circulation Program (https://usclivar.org/amoc) and BioGeoChemical Array for Real-time Geostrophic Oceanography program (https://biogeochemical-argo.org). Such programs require a higher-level data product than what OOI provides through its standard data dissemination, and hence a quality controlled, salinity-calibrated data product has been produced. Data are in text format, data description is in PDF.
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Water temperature and salinity profiles from the Ocean Observatories Initiative Global Irminger Sea Array Apex profiler mooring from September 2014 to May 2020 (NCEI Accession 0285241)
This dataset is comprised of processed and edited temperature and salinity profiles from the OOI (Ocean Observatories Initiative) Global Irminger Sea Array Apex profiler mooring from September 2014 to May 2020 (https://oceanobservatories.org/array/global-irminger-sea-array/). The original dataset (including physical units) is available at https://ooinet.oceanobservatories.org/data_access/?search=GI02HYPM-WFP02-00-WFPENG000. Methods: Vertical profile data were gridded using 5 m depth intervals taking the mean of upward and downward profiles. Salinity spikes were removed using a threshold of 0.01 over 5 m. Any salinity bins fresher than 34.72 were then removed. Salinity biases were corrected by referencing to a potential temperature of 2.5C, which was the deepest, most consistently sampled potential temperature of the dataset (Toole et al. 2017). The reference salinity at the reference isotherm was chosen to be 34.93 based on calibrated shipboard CTD measurements taken near the mooring on the OOI mooring service cruises from 2014 to 2019 (dataset references below). Salinity was calibrated by first subtracting the reference salinity from the raw value at the reference isotherm and then finding the ratio between this difference and the reference salinity. This gain correction was then multiplied by the full profile to produce the final salinity. The salinity is anchored to the reference salinity at the deep reference isotherm and this dataset should be used knowing that this is not necessarily realistic in this area of deep water mass formation. Caution should be used looking at properties near the reference isotherm. However, the salinity biases in the raw data are significant and without correction this time series is discontinuous whenever the mooring is replaced. The patterns in the upper part of the water column agree with nearby measurements (de Jong et al., 2023). Final Data: All data are included in a single NetCDF file, ‘OOI_Irm_HYPM_cal_21Mar2021_NCEIannotated_15Nov2023.nc’. The included fields are: time [days since 2000-01-01], depth [meters], practical salinity ‘sal’ [psu], in-situ temperature ‘temp’ [C], latitude [degrees north], and longitude [degrees east]. The Gibbs Seawater oceanographic toolbox (McDougall et al., 2011) was used to calculate all variables.
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- Award ID(s):
- 2244833
- PAR ID:
- 10627722
- Publisher / Repository:
- NOAA National Centers for Environmental Information
- Date Published:
- Format(s):
- Medium: X
- Location:
- (East Bound Longitude:-40; North Bound Latitude:59.5; South Bound Latitude:59; West Bound Longitude:-40.5)
- Sponsoring Org:
- National Science Foundation
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