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            <gco:CharacterString>Cite this dataset as: Babbin, A. R., Cinay, T. (2025) Monthly atmospheric nitrous oxide (N₂O) and carbon monoxide (CO) mixing ratio measurements from San Cristobal, Galápagos Islands collected using a cavity ring-down spectrometer from July 2023 to December 2024. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 3) Version Date 2025-04-04 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.917743.3 [access date]</gco:CharacterString>
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        <gco:CharacterString>Monthly N₂O data from San Cristobal Dataset Description: &amp;lt;p&amp;gt;This version (v3) of the dataset includes 18 NetCDF files:&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(1) GAL202307_N2O_CO.nc for the time period 2023-07-18 to 2023-07-31 (yyyy-mm-dd)&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(2) GAL202308_N2O_CO.nc for the time period 2023-08-01 to 2023-08-31&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(3) GAL202309_N2O_CO.nc for the time period 2023-09-01 to 2023-09-30&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(4) GAL202310_N2O_CO.nc for the time period 2023-10-01 to 2023-10-31&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(5) GAL202311_N2O_CO.nc for the time period 2023-11-01 to 2023-11-30&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(6) GAL202312_N2O_CO.nc for the time period 2023-12-01 to 2023-12-31&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(7) GAL202401_N2O_CO.nc for the time period 2024-01-01 to 2024-01-31&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(8) GAL202402_N2O_CO.nc for the time period 2024-01-02 to 2024-02-29&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(9) GAL202403_N2O_CO.nc for the time period 2024-03-01 to 2024-03-31&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(10) GAL202404_N2O_CO.nc for the time period 2024-04-01 to 2024-04-30&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(11) GAL202405_N2O_CO.nc for the time period 2024-05-01 to 2024-05-31&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(12) GAL202406_N2O_CO.nc for the time period 2024-06-01 to 2024-06-30&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(13) GAL202407_N2O_CO.nc for the time period 2024-07-01 to 2024-07-31&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(14) GAL202408_N2O_CO.nc for the time period 2024-08-01 to 2024-08-31&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(15) GAL202409_N2O_CO.nc for the time period 2024-09-01 to 2024-09-30&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(16) GAL202410_N2O_CO.nc for the time period 2024-10-01 to 2024-10-31&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(17) GAL202411_N2O_CO.nc for the time period 2024-11-01 to 2024-11-30&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;(18) GAL202412_N2O_CO.nc for the time period 2024-12-01 to 2024-12-31&amp;lt;/p&amp;gt; Methods and Sampling: &amp;lt;p&amp;gt;Ambient air samples are collected with a flow rate of 100 cubic centimeters (cm³ per minute from 27 meters (m) above sea level. The air is first filtered through a 0.7 micrometer (µm) Swagelok filter. Then, the air is dried using a Nafion tubing to a constant water content of approximately 600 parts per million (ppm) H₂O in a temperature-controlled setup at 34 degrees Celsius (°C). The air sample is then filtered through a 0.2 µm Swagelok filter. Finally, the nitrous oxide and carbon monoxide mole fractions (parts per billion (ppb)) are measured using Picarro Inc., G5310 Cavity Ring-down Spectrometer. GCWerks software is used to monitor and control the sampling process as well as export the measurement data. The NetCDF files are created using the Xarray package for Python 3.10.&amp;lt;/p&amp;gt;</gco:CharacterString>
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        <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/award/859616.rdf" xlink:title="OCE-2138890" xlink:actuate="onRequest">Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2138890 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2138890</gmx:Anchor>
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Nitrous oxide is a potent greenhouse gas and agent of ozone destruction. Atmospheric concentrations are rising, but the role of natural marine sources is poorly understood due to a lack of data. High rates of oceanic production are localized to remote areas, impeding direct data acquisition from oxygen minimum zones especially. Correct attribution of sources is key to interpreting observations, establishing mitigation policies, and predicting future climate feedbacks. The investigators aim to quantify marine nitrous oxide fluxes through a continuous monitoring site in the eastern Pacific that can identify hotspots and mechanisms of production. Such a station will permit the ocean’s role in this greenhouse gas budget to be refined and its variability across space and time to be assessed. The data will be publicly accessible and maintained at a bilingual web portal in English and Spanish. The work will further educate and train a graduate student in oceanic and climate sciences and help establish an early career investigator.&lt;/p&gt;
&lt;p&gt;The project will establish an atmospheric chemistry monitoring station at the Galapagos Science Center in Ecuador to continuously measure nitrous oxide and carbon monoxide. The measurements will be linked specifically to ocean outgassing via atmospheric inversion modeling. This new methodology complements sea-going research, permitting the assessment of emissions across the entire eastern tropical Pacific Ocean region from a single well-sited monitoring station. The investigators will specifically deploy a cavity ring-down laser spectrometer onsite, maintain the instrument, and analyze the continuous data. By the end of this initial 2-year study, a multi-year record of primary atmospheric concentrations of nitrous oxide will be established and tied to emissions from specific ocean sources. The researchers will map the data via inversion modeling, paying particular attention to cross-shelf variability and any roles of sub-mesoscale eddies in modifying the rate of nitrous oxide loss from the ocean. Carbon monoxide will be utilized as a diagnostic molecule for terrestrial influence on nitrous oxide. Overall, this project will elucidate the emissions from a critical yet under-sampled production region and reduce the level of uncertainty in data products and modeled syntheses. These measurements will aid in interpreting global observations, ground-truth current and future sampling campaigns, and improve forecasting of climate scenarios into the future.&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;
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Version 2 of this dataset was published on 2024-11-19. Version 2 includes files covering the time period from 2023-07-18 to 2024-06-30. Previous files have been updated/replaced; version 2 supersedes version 1.

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