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            <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/dataset/821268.rdf" xlink:actuate="onRequest">Nitrous oxide (N2O) concentrations and associated physicochemical parameters from R/V Atlantis cruise AT15-61 in Jan-Feb 2010 and R/V Melville cruise MV1104 in Mar-Apr 2011 in the Eastern Tropical South Pacific (ETSP)</gmx:Anchor>
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            <gco:CharacterString>Cite this dataset as: Casciotti, K. L., Gluschankoff, N., Santoro, A. E., McIlvin, M. R., Forbes, M. (2023) Nitrous oxide (N2O) concentrations and associated physicochemical parameters from R/V Atlantis cruise AT15-61 in Jan-Feb 2010 and R/V Melville cruise MV1104 in Mar-Apr 2011 in the Eastern Tropical South Pacific (ETSP). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2) Version Date 2023-07-28 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.821268.2 [access date]</gco:CharacterString>
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        <gco:CharacterString>ETSP N2O Dataset Description: &amp;lt;p&amp;gt;These data were published as Figure 5 in Santoro et al. (2020).&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Nitrate (NO3-) and Nitrite (NO2-) d15N and d18O data from the samples are available in the related dataset &amp;quot;ETSP NO3 and NO2 isotopes&amp;quot; &amp;lt;a href=&amp;quot;http://(https://www.bco-dmo.org/dataset/903891&amp;quot; target=&amp;quot;_blank&amp;quot;&amp;gt;(https://www.bco-dmo.org/dataset/903891&amp;lt;/a&amp;gt;).&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Description of changes/updates contained in version 2 of this dataset:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
Most depths were analyzed in duplicates from two bottles (i.e. one measurement of all isotopic variables and a concentration per bottle). This version (v2) contains each measurement in a unique column (i.e. d15n_alpha1, d15n_alpha2, etc.). A quality control (QC) flag was also added for each measurement using the SeaDataNet QC guidelines available at &amp;lt;a href=&amp;quot;https://www.seadatanet.org/Standards/Data-Quality-Control&amp;quot; target=&amp;quot;_blank&amp;quot;&amp;gt;https://www.seadatanet.org/Standards/Data-Quality-Control&amp;lt;/a&amp;gt;.&amp;lt;/p&amp;gt; Methods and Sampling: &amp;lt;p&amp;gt;Seawater samples were obtained during the R/V Atlantis (AT15-61) and R/V Melville (MV1104) cruises from January to February 2010 and March to April 2011. Water samples were collected at discrete depths using Niskin bottle type rosette samplers equipped with either 24 bottles (10L) or 12 bottles (20L), and an SBE9plus conductivity-temperature-depth (CTD) sensor package (SeaBird Electronics, Bellevue, WA). This dataset's samples were collected from Niskin bottles into 160-milliliter (mL) glass serum vials, killed with saturated mercuric chloride, and crimp sealed with gray butyl stoppers. Prior to sealing, ~1 mL of sample was removed to allow room for sample expansion and to prevent the sample vessel from shattering upon warming.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;In all cases, samples were extracted and analyzed using a custom automated purge and trap inlet system and normalized to an injection of calibrated pure N2O reference gas introduced prior to the elution of each sample peak (McIlvin &amp;amp;amp; Casciotti, 2010). Isotope ratios were referenced initially to the calibrated N2O reference tank to create a set of 'ratio of ratios' (³¹Rsample/³¹Rreference, ⁴⁵Rsample/⁴⁵Rreference, ⁴⁶Rsample/⁴⁶Rreference). Next, the data were size corrected in reference to a calibrated 20 volt-second (Vs) peak area for a mass-to-charge ratio of 44 (m/z 44). Finally, 'scrambling coefficients' were applied to the isotopomer data to correct the measured 15Ra and 15Rb for the rearrangement of nitrogen atoms in N2O when the gas is ionized in the mass spectrometer ion source (Frame et al., 2014; Frame &amp;amp;amp; Casciotti, 2010; Kelly et al., 2021). The isotope ratios of N and O atoms in N2O, ¹⁵Rsample or ¹⁸Rsample, respectively, are expressed in delta notation (δ), where the δ15N and δ18O are defined relative to the isotope ratios of certified standards: δ15N or δ18O = (Rsample/Rstandard - 1) x1000. The Rstandard values used for δ15N and δ18O are the ratios of 15N/14N and 18O/16O in atmospheric N2 and Vienna Standard Mean Ocean Water (VSMOW), respectively.&amp;lt;/p&amp;gt;</gco:CharacterString>
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        <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/award/555515.rdf" xlink:title="OCE-0961098" xlink:actuate="onRequest">Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-0961098 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=0961098</gmx:Anchor>
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http://lod.bco-dmo.org/id/dataset-parameter/904128.rdf
	Name: Latitude
	Units: decimal degrees
	Description: &lt;p&gt;Latitude of sample collection, South is negative&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904129.rdf
	Name: Longitude
	Units: decimal degrees
	Description: &lt;p&gt;Longitude of sample collection, West is negative&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904130.rdf
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	Units: unitless
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http://lod.bco-dmo.org/id/dataset-parameter/904131.rdf
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	Units: unitless
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http://lod.bco-dmo.org/id/dataset-parameter/904132.rdf
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	Units: meters (m)
	Description: &lt;p&gt;Sample collection depth&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904133.rdf
	Name: Salinity
	Units: practical salinity units (psu)
	Description: &lt;p&gt;Salinity&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904134.rdf
	Name: Temperature
	Units: degrees Celsius
	Description: &lt;p&gt;Temperature&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904135.rdf
	Name: Density
	Units: kilograms per cubic meter (kg/m^3)
	Description: &lt;p&gt;Seawater density&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904136.rdf
	Name: Oxygen
	Units: micromoles per kilogram (umol/kg)
	Description: &lt;p&gt;Dissolved oxygen&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904137.rdf
	Name: Pressure
	Units: decibars
	Description: &lt;p&gt;Pressure&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904138.rdf
	Name: Potential_Temp
	Units: degrees Celsius
	Description: &lt;p&gt;Potential temperature&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904139.rdf
	Name: AOU
	Units: micromoles per kilogram (umol/kg)
	Description: &lt;p&gt;Apparent oxygen utilization&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904140.rdf
	Name: sigma_theta
	Units: kilograms per cubic meter (kg/m^3)
	Description: &lt;p&gt;sigma-theta, Potential density anomaly&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904141.rdf
	Name: sigma_T
	Units: kilograms per cubic meter (kg/m^3)
	Description: &lt;p&gt;sigma-T, Density anomaly&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904142.rdf
	Name: d15n_alpha_1
	Units: permille
	Description: &lt;p&gt;First measurement of d15N alpha (inner nitrogen atom) in N2O in reference to atmospheric nitrogen gas, expressed in permille notation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904143.rdf
	Name: d15n_beta_1
	Units: permille
	Description: &lt;p&gt;First measurement of d15N beta (outer nitrogen atom) in N2O in reference to atmospheric nitrogen gas, expressed in permille notation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904144.rdf
	Name: SP_1
	Units: permille
	Description: &lt;p&gt;First measurement of N2O SP (site preference) in N2O in reference to atmospheric nitrogen gas, expressed in permille notation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904145.rdf
	Name: d15n_bulk_1
	Units: permille
	Description: &lt;p&gt;First measurement of d15N bulk in N2O in reference to atmospheric nitrogen gas, expressed in permille notation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904146.rdf
	Name: d17O_1
	Units: permille
	Description: &lt;p&gt;First measurement of d17O in N2O in reference to VSMOW, expressed in permille notation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904147.rdf
	Name: d18O_1
	Units: permille
	Description: &lt;p&gt;First measurement of d18O in N2O in reference to VSMOW, expressed in permille notation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904148.rdf
	Name: N2O_nM_1
	Units: nanomoles per liter (nM)
	Description: &lt;p&gt;First N2O concentration measurement in nanomolar (nM)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904149.rdf
	Name: flag_1
	Units: unitless
	Description: &lt;p&gt;Data quality control flag from SeaDataNet: &lt;a href=&quot;https://www.seadatanet.org/Standards/Data-Quality-Control&quot;&gt;https://www.seadatanet.org/Standards/Data-Quality-Control&lt;/a&gt;. 1 = good value; 2 = probably good value; 3 = probably bad value, 4 = bad value, 9 = missing value&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904150.rdf
	Name: d15n_alpha_2
	Units: permille
	Description: &lt;p&gt;Second measurement of d15N alpha (inner nitrogen atom) in N2O in reference to atmospheric nitrogen gas, expressed in permille notation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904151.rdf
	Name: d15n_beta_2
	Units: permille
	Description: &lt;p&gt;Second measurement of d15N beta (outer nitrogen atom) in N2O in reference to atmospheric nitrogen gas, expressed in permille notation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904152.rdf
	Name: SP_2
	Units: permille
	Description: &lt;p&gt;Second measurement of N2O SP (site preference) in N2O in reference to atmospheric nitrogen gas, expressed in permille notation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904153.rdf
	Name: d15n_bulk_2
	Units: permille
	Description: &lt;p&gt;Second measurement of d15N bulk in N2O in reference to atmospheric nitrogen gas, expressed in permille notation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904154.rdf
	Name: d17O_2
	Units: permille
	Description: &lt;p&gt;Second measurement of d17O in N2O in reference to VSMOW, expressed in permille notation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904155.rdf
	Name: d18O_2
	Units: permille
	Description: &lt;p&gt;Second measurement of d18O in N2O in reference to VSMOW, expressed in permille notation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/904156.rdf
	Name: N2O_nM_2
	Units: nanomoles per liter (nM)
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http://lod.bco-dmo.org/id/dataset-parameter/904157.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/904158.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/904160.rdf
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&amp;lt;p&amp;gt;In all cases, samples were extracted and analyzed using a custom automated purge and trap inlet system and normalized to an injection of calibrated pure N2O reference gas introduced prior to the elution of each sample peak (McIlvin &amp;amp;amp; Casciotti, 2010). Isotope ratios were referenced initially to the calibrated N2O reference tank to create a set of 'ratio of ratios' (³¹Rsample/³¹Rreference, ⁴⁵Rsample/⁴⁵Rreference, ⁴⁶Rsample/⁴⁶Rreference). Next, the data were size corrected in reference to a calibrated 20 volt-second (Vs) peak area for a mass-to-charge ratio of 44 (m/z 44). Finally, 'scrambling coefficients' were applied to the isotopomer data to correct the measured 15Ra and 15Rb for the rearrangement of nitrogen atoms in N2O when the gas is ionized in the mass spectrometer ion source (Frame et al., 2014; Frame &amp;amp;amp; Casciotti, 2010; Kelly et al., 2021). The isotope ratios of N and O atoms in N2O, ¹⁵Rsample or ¹⁸Rsample, respectively, are expressed in delta notation (δ), where the δ15N and δ18O are defined relative to the isotope ratios of certified standards: δ15N or δ18O = (Rsample/Rstandard - 1) x1000. The Rstandard values used for δ15N and δ18O are the ratios of 15N/14N and 18O/16O in atmospheric N2 and Vienna Standard Mean Ocean Water (VSMOW), respectively.&amp;lt;/p&amp;gt;</gco:CharacterString>
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CTD sensor data were processed using Seabird Electronics (SBE) Data Processing software using SBE recommended parameters, including the tau oxygen correction and oxygen hysteresis correction. Processing commands were applied in the following order: filter, alignctd, celltm, loopedit, wildedit.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Derived parameters (pottemp, aou, sigma_theta) were calculated in MATLAB using the CSIRO SEAWATER function library for MATLAB, ver 3.3 (22-Sept-2010).&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Version 1:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
(Version Date: 2020-08-18)&amp;lt;br /&amp;gt;
&amp;lt;strong&amp;gt;v1 BCO-DMO Processing:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
- Added a conventional header with dataset name, PI name, version date.&amp;lt;br /&amp;gt;
- Adjusted parameter names to comply with database requirements.&amp;lt;br /&amp;gt;
- Combined year, month, day fields and adjusted timezone to create ISO date field.&amp;lt;br /&amp;gt;
- Units in parentheses removed and added to Parameter Description metadata section.&amp;lt;br /&amp;gt;
- Missing data identifier of 'NaN' replaced with 'nd'.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Version 2:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
(Version Date: 2023-07-28)&amp;lt;br /&amp;gt;
Description of v2: This includes a further QC'ed version of the v1 data with six additional isotopic variables: d15n_alpha, d15n_beta, Site_preference (SP), d17O, and d18O. N2O samples were analyzed in duplicates, thus each analysis has an associated QC flag.&amp;lt;br /&amp;gt;
&amp;lt;strong&amp;gt;v2 BCO-DMO Processing:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
- Imported original file named &amp;quot;ETSP_ENSO_N2Oisotope_BCODMO_230227.xlsx&amp;quot; sheet 1 into the BCO-DMO data system.&amp;lt;br /&amp;gt;
- Replaced missing data identifier of 'NaN' with blank/empty values, which is the default for csv files.&amp;lt;br /&amp;gt;
- Renamed &amp;quot;Presure&amp;quot; column to &amp;quot;Pressure&amp;quot;.&amp;lt;br /&amp;gt;
- Filled in a value of &amp;quot;1&amp;quot; in the &amp;quot;flag_1&amp;quot; column per request of data submitter.&amp;lt;br /&amp;gt;
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