euphotic वाक्य
उदाहरण वाक्य
मोबाइल
- However, vertical mixing also causes high losses, as phytoplankton are carried below the euphotic zone ( so their respiration exceeds primary production ).
- 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.
- As with self-shading within water-whitening coccolithophore plankton blooms, this may reduce photosynthetic productivity by altering the geometry of the euphotic zone.
- Plankton drive the " biological pump ", a process by which the ocean ecosystem transports carbon from the surface euphotic zone to the ocean's depths.
- 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.
- 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.
- Indeed, in their original paper, Eppley & Peterson noted that : " To relate new production to export requires that nitrification in the euphotic zone be negligible ".
- 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.
- 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.
- 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.
- Particles this small are not only easier for cyanobacteria and other phytoplankton to incorporate, the churning of surface waters keeps them in the euphotic or sunlit biologically active depths without sinking for long periods of time.
- The outer margins of the wide continental shelves of Yucat�n and Florida receive cooler, nutrient-enriched waters from the deep by a process known as upwelling, which stimulates plankton growth in the euphotic zone.
- Since oxygen is not being produced as a byproduct of photosynthesis below the euphotic zone, these microbes use up what oxygen is in the water as they break down the falling organic matter thus creating the lower oxygen conditions.
- A DCM can also exist below the euphotic zone, where less than 1 % of the surface light remains and little photosynthetic growth is possible; these layers are formed by subduction of surface waters, or sinking of cells.
- It can provide a rough indication of the depth of the euphotic zone with a 3-fold division of the " Secchi depth ", however this cannot be used in shallow waters where the disk can still be seen on the bottom.
- "' Sediment traps "'are instruments used in oceanography to measure the quantity of sinking particulate ecological processes typically within the surface euphotic zone, and is of interest to scientists studying the role of the biological pump in the carbon cycle.
- The uppermost portion of the photic zone, where there is adequate light to support photosynthesis by phytoplankton and plants, is referred to as the euphotic zone ( also referred to as the " dysphotic zone ( dysphotic means " poorly lit " in Greek ).
- In several studies, the DCM layer was found to be located in the thermocline, adjacent to the nutracline, at the bottom of the euphotic layer, where light attenuation ranges from ~ 1-2 % up to ~ 10 % of that at the surface.
- Once this carbon is fixed into soft or hard tissue, the organisms either stay in the euphotic zone to be recycled as part of the regenerative nutrient cycle or once they die, continue to the second phase of the biological pump and begin to sink to the ocean floor.
- The euphotic zone is somewhat arbitrarily defined as extending from the surface to the depth where the light intensity is approximately 0.1 1 % of surface sunlight solid particles absorb and scatter light, and in coastal regions the high concentration of these substances causes light to be attenuated rapidly with depth.
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