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        <gco:CharacterString>Methods and Sampling: &amp;lt;p&amp;gt;Data from the CTD, EcoPUCK, and GPS were combined and vertical profiles were constructed from dives using MATLAB. Data were written to a .mat file that was then combined with metadata to create a netCDF file.&amp;amp;nbsp;&amp;lt;br /&amp;gt;
&amp;lt;br /&amp;gt;
Location:&amp;amp;nbsp;Ocean waters south of Palmer Station, located between 63 - 62.3 S latitude and 64-65 W longitude in depths less than 60 m.&amp;lt;br /&amp;gt;
&amp;lt;br /&amp;gt;
Deployment information:&amp;amp;nbsp;&amp;lt;br /&amp;gt;
Palmer RHIB (small boat) operated by United States Antarctic Program operated during the months of Jan - April, 2020 with Principal Investigators: Jackie Veatch, Hank Statscewich, and Josh Kohut.&amp;lt;br /&amp;gt;
&amp;lt;br /&amp;gt;
Related dataset information:&amp;lt;br /&amp;gt;
&amp;lt;br /&amp;gt;
Danielson, S., &amp;amp;amp; Statscewich, H. (2020). Water temperature, salinity, and optical properties from an Acrobat towed vehicle during cruises for the Northern Gulf of Alaska LTER site, 2018 and 2019(Version 1) [Data set]. Axiom Data Science. https://doi.org/10.24431/RW1K471&amp;lt;br /&amp;gt;
* This related dataset was collected during a separate deployment of the same instrument platform. The Gulf of Alaska LTER data collection effort was completed aboard the RV Sikuliaq, a 230' icebreaker, whereas the Palmer Station&amp;amp;nbsp;data published in this BCO-DMO dataset (916046) was&amp;amp;nbsp;conducted on smaller rigid hull inflatable vessels.&amp;amp;nbsp;&amp;lt;/p&amp;gt;</gco:CharacterString>
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Undersea canyons play disproportionately important roles as oceanic biological hotspots and are critical for our understanding of many coastal ecosystems. Canyon-associated biological hotspots have persisted for thousands of years Along the Western Antarctic Peninsula, despite significant climate variability. Observations of currents over Palmer Deep canyon, a representative hotspot along the Western Antarctic Peninsula, indicate that surface phytoplankton blooms enter and exit the local hotspot on scales of ~1-2 days. This time of residence is in conflict with the prevailing idea that canyon associated hotspots are primarily maintained by phytoplankton that are locally grown in association with these features by the upwelling of deep waters rich with nutrients that fuel the phytoplankton growth. Instead, the implication is that horizontal ocean circulation is likely more important to maintaining these biological hotspots than local upwelling through its physical concentrating effects. This project seeks to better resolve the factors that create and maintain focused areas of biological activity at canyons along the Western Antarctic Peninsula and create local foraging areas for marine mammals and birds. The project focus is in the analysis of the ocean transport and concentration mechanisms that sustain these biological hotspots, connecting oceanography to phytoplankton and krill, up through the food web to one of the resident predators, penguins. In addition, the research will engage with teachers from school districts serving underrepresented and underserved students by integrating the instructors and their students completely with the science team. Students will conduct their own research with the same data over the same time as researchers on the project. Revealing the fundamental mechanisms that sustain these known hotspots will significantly advance our understanding of the observed connection between submarine canyons and persistent penguin population hotspots over ecological time, and provide a new model for how Antarctic hotspots function.&lt;/p&gt;
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Danielson, S., &amp;amp;amp; Statscewich, H. (2020). Water temperature, salinity, and optical properties from an Acrobat towed vehicle during cruises for the Northern Gulf of Alaska LTER site, 2018 and 2019(Version 1) [Data set]. Axiom Data Science. https://doi.org/10.24431/RW1K471&amp;lt;br /&amp;gt;
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            </gmd:LI_ProcessStep>
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                <gmd:description>
                  <gco:CharacterString>* No additional processing performed</gco:CharacterString>
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                  <gmd:LI_Source>
                    <gmd:sourceCitation>
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                        <gmd:title>
                          <gco:CharacterString>Specified by BCO-DMO Data Managers</gco:CharacterString>
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                        <gmd:date gco:nilReason="unknown"/>
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          </gmd:LI_Lineage>
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   </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
  <gmd:metadataMaintenance>
    <gmd:MD_MaintenanceInformation>
      <gmd:maintenanceAndUpdateFrequency>
        <gmd:MD_MaintenanceFrequencyCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_MaintenanceFrequencyCode" codeListValue="asNeeded" codeSpace="009">asNeeded</gmd:MD_MaintenanceFrequencyCode>
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        <gco:CharacterString>7.x-1.1</gco:CharacterString>
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      <gmd:contact>
        <gmd:CI_ResponsibleParty>
  <gmd:organisationName>
    <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/affiliation/191.rdf" xlink:actuate="onRequest">Biological and Chemical Oceanography Data Management Office (BCO-DMO)</gmx:Anchor>
  </gmd:organisationName>
  <gmd:contactInfo>
    <gmd:CI_Contact>
		  <gmd:phone>
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				    <gco:CharacterString>Unavailable</gco:CharacterString>
				  </gmd:voice>
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				    <gco:CharacterString>508-289-2009</gco:CharacterString>
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		  <gmd:address>
		    <gmd:CI_Address>
				  <gmd:deliveryPoint>
				    <gco:CharacterString>WHOI MS#36</gco:CharacterString>
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				  <gmd:city>
				    <gco:CharacterString>Woods Hole</gco:CharacterString>
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				    <gco:CharacterString>MA</gco:CharacterString>
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				    <gco:CharacterString>USA</gco:CharacterString>
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				    <gco:CharacterString>info@bco-dmo.org</gco:CharacterString>
				  </gmd:electronicMailAddress>
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		  </gmd:address>
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          <gmd:CI_OnlineResource>
            <gmd:linkage>
              <gmd:URL>http://www.bco-dmo.org</gmd:URL>
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          </gmd:CI_OnlineResource>
        </gmd:onlineResource>
		  <gmd:hoursOfService>
        <gco:CharacterString>Monday - Friday 8:00am - 5:00pm</gco:CharacterString>
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		  <gmd:contactInstructions>
		    <gco:CharacterString>For questions regarding this resource, please contact BCO-DMO via the email address provided.</gco:CharacterString>
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  <gmi:acquisitionInformation>
    <gmi:MI_AcquisitionInformation>
    <gmi:instrument>
        <gmi:MI_Instrument>
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/instrument/528107.rdf" xlink:title="Sea-Bird SBE 49 FastCAT CTD Sensor" xlink:actuate="onRequest"></gmx:Anchor>
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          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString></gco:CharacterString>
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          <gmi:description>
            <gco:CharacterString>PI Supplied Instrument Name:  PI Supplied Instrument Description:Observational data collected using a Seabird SBE49 FastCAT CTD Instrument Name: Sea-Bird SBE 49 FastCAT CTD Sensor Instrument Short Name:SBE-49   Instrument Description: The SBE 49 FastCAT is a CTD sensor for use in autonomous platforms. It contains a SBE 3P temperature sensor, a SBE 4C conductivity sensor and a strain-gauge pressure sensor as standard. It can operate in autonomus (16 Hz per sec) or polled mode (transmits each sample). The sensor is depth-rated to 350 m (plastic housing) or 7000 m (titanium housing). Accuracy: +/- 0.002 deg C (temperature), +/- 0.0003 S/m (conductivity), 0.1% of full scale range (pressure).</gco:CharacterString>
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      <gmi:instrument>
        <gmi:MI_Instrument>
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/instrument/604.rdf" xlink:title="towed undulating vehicle" xlink:actuate="onRequest">ACROBAT</gmx:Anchor>
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            <gco:CharacterString>ACROBAT</gco:CharacterString>
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            <gco:CharacterString>PI Supplied Instrument Name: ACROBAT PI Supplied Instrument Description:The Acrobat is a winged instrument platform that cycles between the surface and 60 m as it is towed behind a ship traveling at speeds of 5 to 8 knots. It is equipped with a SeaBird 49 FastCAT CTD (temperature, conductivity, and pressure) and a Wetlabs EcoPUCK optical sensor (chlorophyll a, colored dissolved organic matter (CDOM), and backscatter). The ACROBAT system has been used to map submesoscale features (fronts, eddies and filaments) and provides a real-time data feed via a faired Kevlar cable to the vehicle operator. The ACROBAT enables adaptive sampling of features of interest and detailed mapping of the upper ocean without aliasing due to tides.  Instrument Name: towed undulating vehicle Instrument Short Name:TUV   Instrument Description: A towed undulating vehicle is a generic class of instruments.  See the data set specific information for a detailed description. These are often prototype instrument packages designed to make very specific measurements.</gco:CharacterString>
          </gmi:description>
        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument>
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/instrument/860156.rdf" xlink:title="WETLabs ECO FLBB scattering fluorescence sensor" xlink:actuate="onRequest">Wetlabs three-channel flbbcd EcoPUCK</gmx:Anchor>
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            <gco:CharacterString>Wetlabs three-channel flbbcd EcoPUCK</gco:CharacterString>
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            <gco:CharacterString>PI Supplied Instrument Name: Wetlabs three-channel flbbcd EcoPUCK PI Supplied Instrument Description:Wetlabs three-channel flbbcd EcoPUCK mounted on an Acrobat vehicle. Instrument Name: WETLabs ECO FLBB scattering fluorescence sensor Instrument Short Name:WETLabs ECO FLBB   Instrument Description: A dual-optical-sensor that carries a single-wavelength chlorophyll fluorometer (470nm ex/695nm em) and backscattering sensor (700 nm) that measures phytoplankton and particle concentration. It operates by using blue (470nm) and red (700 nm) LEDs that alternately flash. The blue LED stimulates chlorophyll fluorescence in plants while the red light illuminates the total particle field. The backscattering sensor has an in-water centroid angle of 142 degrees and can be calibrated to measure turbidity. The fluorometer can typically measure phytoplankton concentrations in the range 0-30 ug/l, with a sensitivity of 0.015 ug/l. The backscattering sensor can measure within the range 0-3 m-1, with a sensitivity of 0.0015 m-1. The instrument output in the standard version is digital and uses a low power mode and stores data. Other variants are used. The instrument is rated to a depth of 600m as standard, with the options of deeper instruments rated up to 6000m and instruments with bio-wipers, rated to 300 m.

This instrument comes in the following optional models: FLbb(RT), FLbb(RT)D, FLbbB, FLbbS, FLbbBS, FLbb2k. Refer to the datasheet from the manufacturer: https://www.seabird.com/asset-get.download.jsa?id=55460873804</gco:CharacterString>
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