TU Darmstadt / ULB / TUbiblio

A 600 k.y. record of El Niño–Southern Oscillation (ENSO): Evidence for persisting teleconnections during the Middle Eocene greenhouse climate of Central Europe

Lenz, O. K. and Wilde, V. and Riegel, W. and Harms, F.-J. (2010):
A 600 k.y. record of El Niño–Southern Oscillation (ENSO): Evidence for persisting teleconnections during the Middle Eocene greenhouse climate of Central Europe.
In: Geology, pp. 627-630, 38, (7), [Article]

Abstract

The El Niño–Southern Oscillation (ENSO) is a globally important factor in today’s climate dynamics. Annually laminated oil shales from the maar lake of Messel (Germany) provide high-resolution sedimentological and paleoenvironmental data of a time interval of ~600 k.y. during the Eocene greenhouse phase. Individual laminae consist of a light spring and summer algal layer (Tetraedron minimum layer) and a dark winter layer composed of terrigenous background sediment. Four sections were selected from the core of the Messel 2001 well in order to count varves and to measure total varve thickness and the thickness of light and dark laminae. Spectral analyses were done in order to detect possible cyclic fl uctuations in varve thickness. Fluctuations are signifi cant in the quasi-biennial (2.1–2.5 yr) and low-frequency band (2.8–3.5 yr, 4.9–5.6 yr), thus showing that algal growth as well as the background sedimentation were controlled by ENSO effects at least over a time interval of 600 k.y. This confirms the existence of a previously postulated robust Eocene ENSO. Significant peaks within a quasi-decadal (10–11 yr), interdecadal (17–26 yr), and multidecadal band (~52 yr, ~82 yr) show either the enduring influence of more or less cyclic instabilities or the influence of solar cycles.

Item Type: Article
Erschienen: 2010
Creators: Lenz, O. K. and Wilde, V. and Riegel, W. and Harms, F.-J.
Title: A 600 k.y. record of El Niño–Southern Oscillation (ENSO): Evidence for persisting teleconnections during the Middle Eocene greenhouse climate of Central Europe
Language: English
Abstract:

The El Niño–Southern Oscillation (ENSO) is a globally important factor in today’s climate dynamics. Annually laminated oil shales from the maar lake of Messel (Germany) provide high-resolution sedimentological and paleoenvironmental data of a time interval of ~600 k.y. during the Eocene greenhouse phase. Individual laminae consist of a light spring and summer algal layer (Tetraedron minimum layer) and a dark winter layer composed of terrigenous background sediment. Four sections were selected from the core of the Messel 2001 well in order to count varves and to measure total varve thickness and the thickness of light and dark laminae. Spectral analyses were done in order to detect possible cyclic fl uctuations in varve thickness. Fluctuations are signifi cant in the quasi-biennial (2.1–2.5 yr) and low-frequency band (2.8–3.5 yr, 4.9–5.6 yr), thus showing that algal growth as well as the background sedimentation were controlled by ENSO effects at least over a time interval of 600 k.y. This confirms the existence of a previously postulated robust Eocene ENSO. Significant peaks within a quasi-decadal (10–11 yr), interdecadal (17–26 yr), and multidecadal band (~52 yr, ~82 yr) show either the enduring influence of more or less cyclic instabilities or the influence of solar cycles.

Journal or Publication Title: Geology
Volume: 38
Number: 7
Uncontrolled Keywords: El Niño–Southern Oscillation (ENSO); Eocene; Messel; Germany; maar lake; varve analysis; time series analysis
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Applied Sedimentary Geology
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences
Date Deposited: 21 Oct 2010 11:14
Identification Number: doi:10.1130/G30889.1
Export:

Optionen (nur für Redakteure)

View Item View Item