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    <attribute name="units" value="days since 1970-01-01" />
    <attribute name="calendar" value="proleptic_gregorian" />
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      <attribute name="long_name" value="Depth below which light threshold reached" />
      <attribute name="units" value="m" />
      <attribute name="alias" value="Critical Depth (m)" />
      <attribute name="level_descr" value="Surface" />
      <attribute name="field_descr" value="The critical depth is defined as the depth at which the modelled light level in the water column, illuminated by ALAN, drops below 0.102 µWm-2, the minimum irradiance of white light that elicits diel vertical migration in adult female Calanus copepods (Batnes et al., 2015). This is function of incident ALAN irradiance at the surface as well as the in-water transparency (governed by in-water optically active constituents)." />
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