index.html

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layout: default
title: Dissolved oxygen monitoring
stations:
  - P4
  - P26
plot_types:
  - oxygen-on-density-surfaces
---

<h1>{{ page.title }}</h1>
<p style="color: grey">
    February 2024<br><br>
</p>
<p>
    This page hosts plots of data from stations P4 and P26 (Ocean Station Papa - OSP) on Line P.
    The data were obtained from the Institute of Ocean Sciences (IOS) and National Oceanographic
    and Atmospheric Administration (NOAA) archives. More information on the Line P Program is
    available on the <a href="https://www.waterproperties.ca/">Water Properties</a> website,
    including a full list of publications.
</p>

<!--Tab links-->
<div class="tab">
    <button class="tablinks" onclick="openTab(event, 'Location')" id="defaultOpen">
        Location
    </button>
    <button class="tablinks" onclick="openTab(event, 'Oxygen')">
        Oxygen on density surfaces
    </button>
</div>

<!--Tab content-->
<div id="Location" class="tabcontent">
    <a href="./figures/Line_Psmall.png">
        <img src="./figures/Line_Psmall.png" loading="lazy">
    </a>
    <p>
        Figure from <a href="https://www.waterproperties.ca/">Water Properties</a>.
    </p>
</div>

<div id="Oxygen" class="tabcontent">
    <p>
        The plots below were reproduced from Crawford & Pen&#771;a (2021) and show oxygen on potential
        density anomaly surfaces. The Python code for carrying
        out the data processing and plotting for figures is located on
        <a href="https://github.com/hhourston/ios_profile_data_visualization">GitHub</a>.
    </p>

    <a href="./figures/CrawfordPena_OSP_1955-2023_o2.png">
        <img src="./figures/CrawfordPena_OSP_1955-2023_o2.png" loading="lazy" width="500">
    </a>

    <a href="./figures/CrawfordPena_P4_1950-2023_o2.png">
        <img src="./figures/CrawfordPena_P4_1950-2023_o2.png" loading="lazy" width="500">
    </a>

    <p>
        The potential density anomaly surfaces 26.9, 26.7 and 26.5 correspond to the potential density
        surfaces 1026.9 kg/m<sup>3</sup>, 1026.7 kg/m<sup>3</sup> and 1026.5 kg/m<sup>3</sup>,
        respectively. 1-degree and 2-degree trends were computed using least squares.
    </p>
</div>

<h2>References</h2>
<p>
    Crawford and Peña. 2021. In Boldt et al. 2021. State of the physical, biological and selected
    fishery resources of Pacific Canadian marine ecosystems in 2020. Can. Tech. Rep. Fish. Aquat.
    Sci. 3434: vii + 231 p.<br><br>

<!--    William R. Crawford & M. Angelica Peña (2016) Decadal Trends in Oxygen Concentration in Subsurface-->
<!--    Waters of the Northeast Pacific Ocean, Atmosphere-Ocean, 54:2, 171-192,-->
<!--    DOI: 10.1080/07055900.2016.1158145<br><br>-->

<!--    William R. Crawford & M. Angelica Peña (2013) Declining Oxygen on the British Columbia Continental-->
<!--    Shelf, Atmosphere-Ocean, 51:1, 88-103, DOI:10.1080/07055900.2012.753028<br><br>-->

<!--    Only show most relevant refs?-->
<!--    Garcia H. E., K.W. Weathers, C.R. Paver, I. Smolyar, T.P. Boyer, R.A. Locarnini, M.M. Zweng, A.V.-->
<!--    Mishonov, O.K. Baranova, D. Seidov, and J.R. Reagan (2019). World Ocean Atlas 2018, Volume 3:-->
<!--    Dissolved Oxygen, Apparent Oxygen Utilization, and Dissolved Oxygen Saturation. A. Mishonov-->
<!--    Technical Editor. NOAA Atlas NESDIS 83, 38pp. (Available at-->
<!--    https://www.nodc.noaa.gov/OC5/woa18/pubwoa18.html).<br><br>-->

<!--    Garcia, H. E., T. P. Boyer, R. A. Locarnini, O. K. Baranova, M. M. Zweng (2018). World Ocean-->
<!--    Database 2018: User’s Manual (prerelease). A.V. Mishonov, Technical Ed., NOAA, Silver Spring, MD-->
<!--    (Available at https://www.NCEI.noaa.gov/OC5/WOD/pr_wod.html).<br><br>-->

<!--    Hernan E. Garcia & Louis I. Gordon (1992) Oxygen solubility in seawater: Better fitting equations,-->
<!--    Limnol. Oceanogr., 37(6), 1992, 1 307-1312.-->
</p>

<h2>Contact</h2>
<p>
    Data Products Team, Ocean Sciences Division<br>
    DFO.PAC.SCI.IOSData-DonneesISO.SCI.PAC.MPO@dfo-mpo.gc.ca
</p>

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