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Marine biogeochemical cycles are biogeochemical cycles that occur within marine environments, that is, in the saltwater of seas or oceans or the brackish water of coastal estuaries. These biogeochemical cycles are the pathways chemical substances and elements move through within the marine environment.
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Rivers eventually feed into the ocean, providing approximately 50% of marine inputs. [2] The remainder of lithium inputs come from hydrothermal venting at mid-ocean ridges, where lithium is released from the mantle. [1] Secondary clay formation removes dissolved lithium from seawater to the authigenic clays [3] and to the altered oceanic crust. [1]
The aquatic microbial loop is a marine trophic pathway which incorporates dissolved organic carbon into the food chain.. The microbial loop describes a trophic pathway where, in aquatic systems, dissolved organic carbon (DOC) is returned to higher trophic levels via its incorporation into bacterial biomass, and then coupled with the classic food chain formed by phytoplankton-zooplankton-nekton.
Zinc is a marine micronutrient that tends to be in higher concentration in the deep ocean and is transformed into organic zinc which enters the food chain by diatom blooms during upwelling events in the Southern Ocean. [2] Zinc settles to the ocean floor and is returned to the mantle from the subduction of marine sediments. [3]
Biogeochemistry is the scientific discipline that involves the study of the chemical, physical, geological, and biological processes and reactions that govern the composition of the natural environment (including the biosphere, the cryosphere, the hydrosphere, the pedosphere, the atmosphere, and the lithosphere).
The fluorine cycle is the series of biogeochemical processes through which fluorine moves through the lithosphere, hydrosphere, atmosphere, and biosphere. Fluorine originates from the Earth’s crust, and its cycling between various sources and sinks is modulated by a variety of natural and anthropogenic processes.
In other words, it is a biologically mediated process which results in the sequestering of carbon in the deep ocean away from the atmosphere and the land. The biological pump is the biological component of the "marine carbon pump" which contains both a physical and biological component.