However, vertical mixing also causes high losses, as phytoplankton are carried below the euphotic zone ( so their respiration exceeds primary production ).
22.
It extends from the surface down to a depth where light intensity falls to one percent of that at the surface, called the euphotic depth.
23.
As with self-shading within water-whitening coccolithophore plankton blooms, this may reduce photosynthetic productivity by altering the geometry of the euphotic zone.
24.
Plankton drive the " biological pump ", a process by which the ocean ecosystem transports carbon from the surface euphotic zone to the ocean's depths.
25.
The dysphotic zone, where light intensity is considerably less than 1 % of surface irradiance, extends from the base of the euphotic zone to about 1000 metres.
26.
The dysphotic zone, where light intensity is considerably less than 1 % of surface irradiance, extends from the base of the euphotic zone to about 1000 meters.
27.
Indeed, in their original paper, Eppley & Peterson noted that : " To relate new production to export requires that nitrification in the euphotic zone be negligible ".
28.
With an annual average chlorophyll a in the mixed layer of 2.2 mg m " 3 and low nutrient levels in the euphotic zone, the lake is clearly oligotrophic.
29.
Negative values indicate regions in which the dissolved oxygen concentration is elevated above its equilibrium saturation concentration, typically in near-surface euphotic zoneeuphotic waters by primary production and the resulting oxygen evolution.
30.
In open-ocean systems, biological production depends on intense nutrient recycling within the euphotic ( sunlit ) zone, with only a small fraction supported by the input of new nutrients.
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