Physics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..71..415n&link_type=abstract
Earth and Planetary Science Letters, Volume 71, Issue 2, p. 415-426.
Physics
1
Scientific paper
The most important source of dissolved manganese, Mn(II), to the Dead Sea is by upward diffusion from bottom sediments. This source contributes about 80 tons of Mn(II) each year. The concentration of dissolved manganese in the Dead Sea is extraordinarily high (7.03 mg 1-1). It appears that the content (some 1.026 × 106 tons) of dissolved manganese in the sea has remained constant during 1977-1979, although oxygen was introduced into deeper layers during the deepening of the pycnocline (1977-1978) and during the overturn of its water masses in the winter of 1978/79. The rate of oxidation of Mn(II) in Dead Sea water is extremely slow hence Mn(II) may practically be considered as the stable form of Mn in Dead Sea waters. Dilution by fresh water causes a pH rise and may facilitate faster oxidation of the dissolved divalent manganese. It is shown here that the shape of the Mn(II) profile, observed in the lake during 1963, may have developed by oxidation of Mn(II) in the more diluted upper layers and subsequent reduction of the oxidation products in the anoxic and more saline deeper layers during 260 years of continuous meromixis.
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