Amplified bioproductivity during Transition IV (332 000-342 000 yr ago): evidence from the geochemical record of Lake El'gygytgyn

Cunningham, L.; Vogel, Hendrik; Wennrich, V.; Juschus, O.; Nowaczyk, N.; Rosén, P. (2013). Amplified bioproductivity during Transition IV (332 000-342 000 yr ago): evidence from the geochemical record of Lake El'gygytgyn. Climate of the past, 9(2), pp. 679-686. Copernicus Publications 10.5194/cp-9-679-2013

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Abstract. To date, terrestrial archives of long-term climatic
change within the Arctic have widely been restricted to
ice cores from Greenland and, more recently, sediments
from Lake El’gygytgyn in northeast Arctic Russia. Sediments
from this lake contain a paleoclimate record of glacialinterglacial
cycles during the last three million years. Lowresolution
studies at this lake have suggested that changes
observed during Transition IV (the transition from marine
isotope stage (MIS) 10 to MIS 9) are of greater amplitude
than any observed since. In this study, geochemical parameters
are used to infer past climatic conditions thus providing
the first high-resolution analyses of Transition IV from
a terrestrial Arctic setting. These results demonstrate that a
significant shift in climate was subsequently followed by a
rapid increase in biogenic silica (BSi) production. Following
this sharp increase, bioproductivity remained high, but
variable, for over a thousand years. This study reveals differences
in the timing and magnitude of change within the ratio
of silica to titanium (Si/Ti) and BSi records that would not
be apparent in lower resolution studies. This has significant
implications for the increasingly common use of Si/Ti data
as an alternative to traditional BSi measurements.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geological Sciences > Quaternary Geology

UniBE Contributor:

Vogel, Hendrik

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

1814-9324

Publisher:

Copernicus Publications

Language:

English

Submitter:

Hendrik Vogel

Date Deposited:

19 Jun 2014 09:16

Last Modified:

11 Dec 2014 19:32

Publisher DOI:

10.5194/cp-9-679-2013

BORIS DOI:

10.7892/boris.45270

URI:

https://boris.unibe.ch/id/eprint/45270

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