Figure 2 - uploaded by Tracey T. Sutton
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Chart echogram (left) and digital display (right) of 120 kHz acoustic backscattering illustrating spatial patchiness of zooplankton distribution in the Antarctic. The zooplankton layers centered at about ca. 30 m (left) and at ca. 50 and 100 m (right) are primarily composed of the euphausiids, Euphausia superba and E. crystallorophias. Digital display from Hydroacoutic Technology, Inc. Model DES244; volume backscattering increases from blue to red.
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The composition and structure of marine food webs and it's variation in space and time influence the quality and quantity of carbon exported from surface water, the concentration of inorganic nutrients, and the elemental ratios of particulate and dissolved pools in the ocean. Marine phytoplankton, microzooplankton and larger zooplankton important t...
Context in source publication
Context 1
... strength) is proportional to the orientation, size, and material properties (sound speed and density contrast relative to seawater) of the target. The returned sound is detected by a receiver, amplified, and sent to an output device and/or an echoprocessor. If the returned signal exceeds a set threshold, a mark appears on the graphic display (Fig. 2). The distance from the top of the display to the mark is proportional to the roundtrip of the sound traveled and therefore the range or distance from the transducer. The range of sound penetration and the size of the target detected are dependent on the frequency of the transmitted sound. Frequencies appropriate for zooplankton range ...
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