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                    <gco:CharacterString>These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP).</gco:CharacterString>
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Units: degree Celsius;
Observation Category: in situ;
Sampling Instrument: CTD</gco:CharacterString>
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Units: psu;
Observation Category: in situ;
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Units: micro mol per kilogram;
Observation Category: in situ;
Sampling Instrument: CTD</gco:CharacterString>
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Units: micro mol per kilogram;
Observation Category: in situ;
Sampling Instrument: Multi-bottle sampler</gco:CharacterString>
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Units: total scale;
Observation Category: in situ;
Sampling Instrument: Multi-bottle sampler</gco:CharacterString>
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Units: micrograms per liter;
Observation Category: in situ;
Sampling Instrument: Multi-bottle sampler</gco:CharacterString>
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Units: degree;
Observation Category: in situ;
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Units: knot;
Observation Category: in situ;
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            <gco:CharacterString>Acoustic Doppler Current Profiler

The Acoustic Doppler Current Profiler (ADCP) measures currents beneath a ship while underway. Sound signals sent from the moving ship bounce back to receivers aboard the ship. This provides a profile of water movement relative to the ship-precise modern navigation, allowing the ship's motion to be subtracted from the data. These devices are also used on moorings and profilers and, along with acoustic backscattering, measure animal biomass. Particles in the path of the sound waves, mostly plankton, reflect a small part of the sound energy back toward receivers, allowing researchers to make remote estimates of the sizes and numbers of animals present in the water column. Before the 1970's, the most technologically advanced instrument used to measure water velocity was known as a Doppler speed log. This evolved into the first commercial ADCP, produced in the mid-1970's, which used averaging. Later in the 1970's, the first vessel-mounted ADCP was developed to measure water velocity more accurately and to allow measurement in range cells over a depth profile.

As instruments evolved, so did new techniques in Doppler signal processing. Initially, Doppler speed logs used simple analog signal processing methods, which are still used in some commercial speed logs today. However, the first ADCPs incorporated analog-to-digital signal conversion over a narrow communication bandwidth. Around 1990, this technique was developed into broadband signal processing. Since then, broadband ADCPs have been able to generate very accurate, real-time velocity measurements.</gco:CharacterString>
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      <gmi:instrument>
        <gmi:MI_Instrument id="inst_be3d">
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Why special entry for Niskin bottle but no entry for Nansen bottle?</gco:CharacterString>
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            <gco:CharacterString>Updated information from ICES for the vessel KEIFU MARU from JAPAN has been added.

Code : 49UF
Name : KEIFU MARU
Flag : JAPAN - JP (ISO Country Code)
Call Sign : JPBN
Platform Class : 31 Research vessel
IMO : 9237838
Commissioned Date : 2000
Current Length : 81
Built : 2000
Notes : WOD code 8887. MMSI 431560000

Additional Information Sources:
- http://www.marinetraffic.com/ais/ru/shipdetails.aspx?mmsi=431560000

General Comments:
Confirmed in Miramar Ship Index</gco:CharacterString>
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