منابع مشابه
Ocean trace element cycles.
The oceans are salty. Each litre contains about 35 g of dissolved salts, resulting from the balance between inputs and outputs to the ocean over geological time. The constituents of common salt—Na and Cl—make up more than 90% of this dissolved mass, and together with Mg, S and Ca, represent 99%. Add only three more elements— K, Br and C—and you have more than 999 parts in a 1000 of the dissolve...
متن کاملHydrothermal impacts on trace element and isotope ocean biogeochemistry
Hydrothermal activity occurs in all ocean basins, releasing high concentrations of key trace elements and isotopes (TEIs) into the oceans. Importantly, the calculated rate of entrainment of the entire ocean volume through turbulently mixing buoyant hydrothermal plumes is so vigorous as to be comparable to that of deep-ocean thermohaline circulation. Consequently, biogeochemical processes active...
متن کاملTrace Element Chemistry Studies
This work was undertaken to measure background silver in Illinois precipitation in the absence of any known seeding operations in or near Illinois. The overall rainfall-weighted mean concentration at several stations was 73 ng/liter. This is somewhat higher than has been found in unseeded precipitation in the western United States, but probably not high enough to preclude identification of silv...
متن کاملPreliminary results on trace element levels in three species of seabirds from the western Indian Ocean
As top predators of pelagic food webs, marine birds naturally bioaccumulate essential and nonessential elements. Levels of arsenic (As), cadmium (Cd), copper (Cu), iron (Fe), mercury (Hg), manganese (Mn), selenium (Se) and zinc (Zn) were determined in the liver, kidneys and muscles of three species of marine birds found on Réunion Island: Barau’s Petrel (Pterodroma baraui), Audubon’s Shearwater...
متن کاملTrace element evolution during crystallisation and remelting of the lunar magma ocean
Newly determined ilmenite-melt and orthopyroxene-melt partition coefficients are used to construct quantitative forward models of the evolution of high field strength element (HFSE, Zr, Nb, Hf, Ta, Th, U) and rare earth element (REE: Nd, Sm, Lu) concentrations during crystallisation and subsequent remelting of the Lunar Magma Ocean (LMO). Crystallisation models suggest that the initial LMO must...
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ژورنال
عنوان ژورنال: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
سال: 2016
ISSN: 1364-503X,1471-2962
DOI: 10.1098/rsta.2015.0300