Unknown
IFM-GEOMAR
In:
IFM-GEOMAR [Annual] Report, 2007 . pp. 17-19.
Publication Date:
2018-10-30
Description:
Arctic Ocean circulation as we know
it today is an exceptional situation
compared with the geological
past. This was shown from geochemical
analyses of a unique marine sediment
core recovered in the central
Arctic Ocean. A major transition from
oxygen-poor sediments to well oxygenated
sediments 17.3 million years
ago indicates that the Fram Strait,
which is the only deep water connection
of the Arctic Ocean with the Atlantic
Ocean, already opened at this time
and allowed the establishment of a
well-ventilated ocean basin. Isotope
geochemical results suggest that the
Arctic deep circulation was strongly
influenced by sea ice formation during
most of the past 15 million years
and was not predominantly controlled
by inflowing Atlantic waters, as is the
case today.
Type:
Article
,
NonPeerReviewed
Format:
text
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