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The Relevance of Manganese in the Ocean for the Climatic Cycles in the Quaternary - Vorgelegt in der Sitzung vom 18. November 1989 (Paperback, Softcover reprint of the original 1st ed. 1990)
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The Relevance of Manganese in the Ocean for the Climatic Cycles in the Quaternary - Vorgelegt in der Sitzung vom 18. November 1989 (Paperback, Softcover reprint of the original 1st ed. 1990)
Series: Sitzungsber.Heidelberg 90, 1990 / 4
Expected to ship within 10 - 15 working days
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It is widely accepted that there is a relationship between ice
volume and the solar insolation in summer in the northern
hemisphere. The Earth's glacial cycles are driven by cyclic changes
in the Earth's orbital elements. This conclusion is based on the
strong coherence between the approx. 20000 and 40000 year spectral
components of ice volume and insolation (Milankovitch-curve)
records. These frequencies are determined by the variation of the
obliquity of the Earth's axis and by its position relative to the
Earth's orbit around the sun. The degree of sum mer insolation on
the Earth's northern Hemisphere is believed to be relevant to
climate because the North Atlantic is where cold saline water is
being formed. Present day deep water circulation is driven by salt
build-up in due to net evapora tion. In contrast, in the North
Pacific precipitation exceeds evaporation. Thus, deep water
transfers a surplus of salt from the N. Atlantic to the North
Pacific. This surface water delivers also oxygen to the deep ocean.
In contrast, upwelling deep water transfers nutrients from the deep
ocean to the surface water. Today the time of renewal of deep water
is in the order of 1000 years."
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