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            <gco:CharacterString>Cite this dataset as: Miller, U. K., Palter, J. B., Fogaren, K. E., Atamanchuk, D., Johnson, C., Koelling, J., Le Bras, I., Lindeman, M., Nagao, H., Nicholson, D. P., Palevsky, H. I., Park, E., Yoder, M. (2026) Dissolved oxygen time series measured on the Overturning in the Subpolar North Atlantic Program (OSNAP) moorings within the boundary currents of the Labrador and Irminger Seas from summer 2020 to summer 2022. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2025-10-13 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.986667.1 [access date]</gco:CharacterString>
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        <gco:CharacterString>Dataset Description: &amp;lt;p&amp;gt;This dataset contains dissolved oxygen time series in two formats: a combined table and individual tables by instrument. The combined table, “986667_v1_oxygen-time-series.csv,” includes the contents of all 60 CSV files contained within Oxygen_time_series-per-instrument.zip, along with metadata from deployment_metadata.csv.&amp;lt;/p&amp;gt;

&amp;lt;div&amp;gt;This dataset was supported by NSF-OCE awards 1947829, 1947970, 1947567, 2122579&amp;amp;nbsp;with additional support from the Canada Excellence Research Chair Program (Chairholder Prof. Douglas Wallace) and the&amp;amp;nbsp;Ocean Frontier Institute, through an award from the Canada First Research Excellence Fund (LRP Module B, PI: Prof. Douglas Wallace and HQP Dr. Dariia Atamanchuk)&amp;lt;br /&amp;gt;
&amp;lt;br /&amp;gt;
OSNAP = Overturning in the Subpolar North Atlantic Program&amp;lt;/div&amp;gt;

&amp;lt;div&amp;gt;
&amp;lt;div&amp;gt;GOHSNAP = Gases in the Overturning and Horizontal circulation of the Subpolar North Atlantic Program&amp;lt;/div&amp;gt;
&amp;lt;/div&amp;gt; Methods and Sampling: &amp;lt;p&amp;gt;Optodes were deployed on moorings within the boundary currents entering and exiting the Labrador Sea, specifically, the Labrador Current in the western Labrador Sea (moorings C1_b, C2_b, C3_b, K7, K8, K9, K10, DSOW 2, and DSOW5), the West Greenland Current in the eastern Labrador Sea (LS1, LS3, LS4, LS5, LS6, LS7, and LS8), and the East Greenland Current in the western Irminger Sea (moorings &amp;amp;nbsp;CF1, CF3, CF4, CF5, CF6, CF7, M1, M2, and M3). These moorings were part of the Overturning in the Subpolar North Atlantic Program (OSNAP) mooring array. &amp;amp;nbsp;Optodes were set to sample every 15 minutes and were deployed from June 2020 - June 2022. &amp;amp;nbsp;LS1, LS3, LS4, LS5, LS6, LS7, and LS8 in the eastern Labrador Sea. Depths of oxygen data collection on the moorings ranged from as shallow as 50 m to as deep as 3500 m, selected to cover the seasonally-stratified, near-surface waters, Labrador Sea Water, Northeast Atlantic Deep Water, and Denmark Strait&amp;amp;nbsp;Overflow Water masses.&amp;lt;/p&amp;gt;</gco:CharacterString>
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                            <gco:CharacterString>&lt;p&gt;&lt;strong&gt;NSF Award Abstract:&lt;/strong&gt;&lt;br /&gt;
Every winter, frigid winds blowing eastward from the North American continent cool the surface waters of the Labrador Sea, which is situated between Canada and Greenland. As the ocean cools, oxygen and carbon dioxide are mixed from the atmosphere into a thick layer of water that ultimately spreads southward to fill a large volume of the North Atlantic and beyond. The presence of this water mass prevents the North Atlantic anywhere from becoming completely devoid of oxygen. Vertical mixing in the Labrador Sea also redistributes carbon dioxide into the deep ocean, where it can remain for hundreds of years, preventing it from contributing to the greenhouse effect. Yet, the processes governing the uptake of gases by the ocean are not well understood or quantified. Given that, over the last century, the ocean has become steadily more depleted in oxygen while also absorbing a large fraction of anthropogenic carbon dioxide, observing gas exchange processes is essential for understanding and predicting the evolution of the ocean and climate system. The circulation of the Labrador Sea has been monitored since 2014 with an array of instrumented cables extending from the seafloor to nearly the ocean surface. This project adds gas sensors to this array to investigate the rates and processes governing gas exchange. Through this project, a student and postdoc will be trained in interdisciplinary oceanography with a rich network of international collaborators. Responding to the need to increase public ocean literacy, the project scientists will work with University of Rhode Island’s Inner Space Center to broadcast live, interactive science sessions to educators at partner high schools and will follow-up with in-person science cafés at three participating schools.&lt;/p&gt;
&lt;p&gt;Given the unique role of the Labrador Sea in providing a pathway for oxygen (O2) and carbon dioxide (CO2) to enter the intermediate depths of the ocean, a quantification and mechanistic understanding of the gas uptake and transport in the basin is a leading scientific priority. Oxygenation of Labrador Sea water prevents large-scale hypoxia from developing anywhere in the Atlantic Ocean and anthropogenic CO2 storage in the basin is the highest in the global ocean. The assumption that, in the Atlantic Ocean, O2 and CO2 uptake and their variability are tied to the dynamics of heat loss and the overturning circulation pervades the literature but has never been evaluated on the basis of direct observations. Thus, GOHSNAP (Gases in the Overturning and Horizontal circulation of the Subpolar North Atlantic Program) addresses this gap and the urgent need to better understand interactions between gas uptake, transport, and the overturning circulation. Specifically, this program will provide a continuous 2-year record of the trans-basin, full water column transport of O2 across the southern boundary of the Labrador Sea, leveraging the mooring infrastructure of the US-lead, international Overturning in the Subpolar North Atlantic Program (OSNAP). The addition of O2 sensors at various depths on this array, supplemented by observations collected by autonomous platforms will allow for the quantification of O2 export from the Labrador Sea. The data will further be used to empirically model carbon concentrations and estimate carbon export. Proposed instruments will also measure the mixed layer O2 and pCO2 for two winters, from which air-sea gas exchange will be calculated and compared against analogous observations in the convective interior of the Labrador Sea.&lt;/p&gt;
&lt;p&gt;This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.&lt;/p&gt;</gco:CharacterString>
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&lt;p&gt;This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2).&lt;br /&gt;
This proposal would fund recovery of deployed oxygen sensors on the OSNAP moorings in the western boundary current of the Irminger Sea, along with deep calibration casts upon recovery, and subsequent processing and analysis of the data. The purpose is to measure O2 that ventilates the deeper boundary current through several pathways leading from the near surface ocean exposed to the atmosphere, into the deeper boundary current, and to investigate the processes responsible. In so doing, the project will also provide information about the pathways of dissolved atmosphere-derived CO2 from the near surface ocean to the deep. Carbon dioxide uptake in the subpolar North Atlantic is thought to significantly mitigate global warming, but as global warming continues, ventilation may decline, potentially weakening this CO2 sink and also reducing oxygen levels throughout the Atlantic. A lack of direct observations of dissolved gases has limited accurate budgeting and hindered understanding of the processes which govern the sequestration of gases into the deep ocean. These results may apply to other ocean regions and inform dissolved gas coupling in ocean and climate models. Broad use of these data will be promoted, to fuel additional advances in the ocean chemistry, ecology, and climate dynamics of this critical region. The project will support an early career female Hispanic/Latina scientist and a graduate student, along with several outreach activities, including documentation of at-sea experience through a blog and interaction with URM student groups.&lt;/p&gt;
&lt;p&gt;Carbon dioxide uptake in the subpolar North Atlantic is thought to significantly mitigate global warming; moreover, oxygen uptake in this region prevents large scale hypoxia throughout the North Atlantic. As global warming continues, convection is expected to decline, potentially weakening this CO2 sink and reducing oxygen levels throughout the Atlantic. However, a lack of direct observations of dissolved gases, particularly in winter and in boundary current regions, has limited accurate budgeting and has hindered our understanding of the processes which govern the sequestration of gases into the deep ocean. Careful calibration and analysis of these valuable new O2 observations is planned, to emphasize an understanding of the dynamics underlying boundary current ventilation and interior-boundary current exchange. Science question addressed are: 1) How effectively does slantwise convection directly ventilate boundary currents? 2) How much oxygen reaches the Irminger Sea’s boundary current through the draining of Labrador Sea Water (LSW) from the interior? 3) To what extent does LSW entrainment set the high oxygen levels in Denmark Strait Overflow Water (DSOW)? These results may apply to other ocean regions and inform dissolved gas coupling in ocean and climate models.&lt;/p&gt;
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	Units: degrees Celsius
	Description: &lt;p&gt;in-situ temperature&lt;/p&gt; 
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	Name: PTEMP
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http://lod.bco-dmo.org/id/dataset-parameter/990193.rdf
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	Units: micromoles per kilogram (umol/kg)
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http://lod.bco-dmo.org/id/dataset-parameter/990194.rdf
	Name: DOXY_drift_corrected
	Units: micromoles per kilogram (umol/kg)
	Description: &lt;p&gt;Dissolved oxygen that has been corrected for the instantaneous pressure effect and drift&lt;/p&gt; 
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	Name: filename
	Units: unitless
	Description: &lt;p&gt;Name of mooring on which the optode was deployed&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/990196.rdf
	Name: serial_number
	Units: unitless
	Description: &lt;p&gt;Optode serial number&lt;/p&gt; 
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	Units: unitless
	Description: &lt;p&gt;Name of mooring on which the optode was deployed&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/990198.rdf
	Name: osnap_id
	Units: unitless
	Description: &lt;p&gt;The Overturning in the Subpolar North Atlantic Program (OSNAP) mooring ID&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/990199.rdf
	Name: depth
	Units: meters (m)
	Description: &lt;p&gt;Depth of optode deployment&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/990201.rdf
	Name: location
	Units: unitless
	Description: &lt;p&gt;Region of mooring/optode deployment&lt;/p&gt; 
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	Name: latitude
	Units: decimal degrees
	Description: &lt;p&gt;latitude (Positive north, negative south)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/990203.rdf
	Name: longitude
	Units: decimal degrees
	Description: &lt;p&gt;longitude (Positive east, negative west)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/990204.rdf
	Name: deploy_cruise_id
	Units: unitless
	Description: &lt;p&gt;Name of research cruise on which the optode/mooring was deployed. AM is Amudsen, AR is Armstrong, MSM is Maria S Merian&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/990205.rdf
	Name: deploy_date
	Units: unitless
	Description: &lt;p&gt;Date on which the optode/mooring was deployed&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/990206.rdf
	Name: recovery_cruise_id
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	Description: &lt;p&gt;Name of the research cruise on which the optode/mooring was recovered. AT is Atlantis, M is Meteor, AR is Armstrong&lt;/p&gt; 
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	Name: recovery_date
	Units: unitless
	Description: &lt;p&gt;Date on which the optode/mooring was recovered&lt;/p&gt; 
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	Name: P_c
	Units: unitless
	Description: &lt;p&gt;The pressure correction factor used to correct for the instantaneous pressure effect (see p_fac and correction of instantaneous pressure effect in Miller et al., 2024; 10.3389/fmars.2024.1441976)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/990209.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/990210.rdf
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	Units: unitless
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http://lod.bco-dmo.org/id/dataset-parameter/990211.rdf
	Name: reversible_drift
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In the combined table 986667_v1_oxygen-time-series.csv the following changes were also made:
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* Date converted to ISO 8601 format
* Column &amp;quot;TIME&amp;quot; converted to ISO 8601 DateTime with timezone (UTC) format and renamed &amp;quot;ISO_DateTime_UTC&amp;quot; 

Supplemental file &amp;quot;deployment_metadata.csv&amp;quot; added from contents of submitted file &amp;quot;Metadata_with_added_filenames.xlsx&amp;quot;
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