The image shows water column depth on the vertical axis and the amount of fluorescence on the horizontal axis. The spike in fluorescence, a measure of chlorophyll, can be seen at 22 m.
Fluorescence
Image courtesy of Eric Collins, University of Alaska Fairbanks. Download image (jpg, 106 KB).

The image shows water column depth on the vertical axis and the amount of fluorescence on the horizontal axis. The spike in fluorescence, a measure of chlorophyll, can be seen at 22 meters (70 feet).

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