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            <gco:CharacterString>Cite this dataset as: Fogaren, K. E., Palevsky, H. I., Nicholson, D. P., Wanzer, L. (2026) Calibrated dissolved oxygen time series at the Ocean Observatories Initiative’s Irminger Sea Array from 2014 to 2022. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2026-05-19 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/998868 [access date]</gco:CharacterString>
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        <gco:CharacterString>DO - Irminger Sea Dataset Description: &amp;lt;p&amp;gt;Primary award supporting the dataset is&amp;amp;nbsp;OCE-2338450 (CAREER: Constraining the high-latitude ocean carbon cycle: Leveraging the Ocean Observatories Initiative (OOI) Global Arrays as marine biogeochemical time series), other awards supporting the data are: OCE-1946072, and OCE-1755574 (Collaborative Research: The Annual Cycle of the Biological Carbon Pump in the Subpolar North Atlantic).&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;The dataset serves the .csv, matlab and netcdf format of the blended oxygen product for increased reuse purporses.&amp;lt;/p&amp;gt; Methods and Sampling: &amp;lt;p&amp;gt;The data presented here were collected by the OOI Global Irminger Sea Array Apex Surface Mooring (SUMO), Apex Wire Following Profiler Mooring (WFP),&amp;amp;nbsp;and Mobile Assets (gliders). Unprocessed data are available at the OOI THREDDS Data Server and&amp;amp;nbsp;OOI Raw Data Archive. Links and DOIs of the instruments and servers can be found under the related datasets section below.&amp;amp;nbsp;&amp;lt;strong&amp;gt;&amp;amp;nbsp;&amp;lt;/strong&amp;gt;&amp;amp;nbsp;&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;The SUMO 1-m oxygen sensor makes measurements continuously at 0.5 Hz while the 12-m oxygen sensor makes burst measurements at 0.5 Hz for 3 minutes every 15 minutes. The WFP (~170-2600 m) collects a profile every 20 hours with a vertical sampling resolution of 2.3 ± 0.15 dbar. While operational, gliders (0-200 m or 0-1000 m) collected profiles approximately 3 times a day with typical vertical sampling resolutions ranging from 0.2 to 7 dbar across deployments.&amp;amp;nbsp;&amp;lt;/p&amp;gt;</gco:CharacterString>
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        <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/award/993938.rdf" xlink:title="OCE-2338450" xlink:actuate="onRequest">Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2338450 Award URL: https://www.nsf.gov/awardsearch/show-award/?AWD_ID=2338450</gmx:Anchor>
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                <gco:CharacterString>&amp;lt;p&amp;gt;We synthesized DO data from the Aanderaa oxygen optodes deployed on the wire-following profiler (WFP), gliders, and surface mooring (SUMO) fixed-depth oxygen sensors to create an intercalibrated, depth-resolved oxygen time series over the full water column throughout the period from January 2015-January 2022. The data QA/QC and calibration approaches applied here build upon community-developed best practices for processing OOI oxygen data (Palevsky, Clayton, et al., 2023) and&amp;amp;nbsp; recommendations for calibration of moored oxygen optodes (Miller et al., 2024), while also incorporating additional steps that our team found were necessary to produce the highest-quality possible final dataset.&amp;amp;nbsp;&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;We summarize here the methods followed to calibrate each of the individual oxygen assets included in the synthesis data product, with further details provided in the Supplementary Information of Fogaren et al. 2026. We used shipboard DO measurements to produce calibrated oxygen depth profiles for each of the turn-around cruises from 2014 to 2022 (Fogaren &amp;amp;amp; Palevsky, 2023). Data from these profiles were used to determine DO concentrations on a stable deep isotherm (3.1θ, 1926 ± 71 dbar) that was not impacted by wintertime ventilation. WFP oxygen data, which measure this deep isotherm on every profile, were calibrated to the measurements on this deep isotherm (building on the approach of Takeshita et al., 2013 and Palevsky &amp;amp;amp; Nicholson, 2018). This calibration was passed on to oxygen data collected by gliders transiting the array based on matchups between temporally and spatially aligned glider and WFP profiles when the glider was within the vicinity of the WFP (&amp;amp;lt;4 km). For the second half of the analysis period, beginning in July 2018, we also include surface mixed-layer dissolved oxygen data collected from optodes deployed at 1 m and 12 m on the Apex surface mooring in the oxygen sensor calibration process. These mixed-layer DO data were separately calibrated based on turn-around cruise measurements at the beginning and end of each sensor deployment and showed good agreement with surface mixed-layer oxygen measurements from the gliders calibrated using the deep isotherm-based method (residual mean ± standard deviation = 1.6 ± 4.6 μmol kg&amp;lt;sup&amp;gt;-1&amp;lt;/sup&amp;gt;).&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;We calculated a daily oxygen concentration along each isobar after removing density and oxygen outliers. To calculate density outliers, density data is detrended along each isobar while below the mixed layer and outliers are determined as data more than 1.5 interquartile ranges above the upper quartile or below the low quartile of the detrended data. After removing density outliers, oxygen data from all glider and WFP deployments are combined and oxygen outliers are determined using the same method used for density outlier detection. A daily mean oxygen value is then computed for each isobar. For full details see Methods and Text S1 and Figure S1-S5 in Fogaren et al. (2026).&amp;lt;/p&amp;gt;</gco:CharacterString>
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