Spatial distribution of area backscatter.
2013-05-02T01:51:03Z (GMT) by
<p>Area backscattering coefficient (m<sup>2</sup> nautical mile<sup>−2</sup>), from the mesopelagic deep scattering layer. Recordings from multi-ship surveys using calibrated SIMRAD 38 kHz echosounders integrating down to 750 m depth (1000 m after 1999). Composite image of data from 1996–2009 during June–July.</p>