The Mediterranean Sea during the Pleistocene – bivalve shells and their potential to reconstruct decadal and seasonal climate signals of the past
Understanding the climate of the past, in particular seasonal temperature amplitudes, is essential to evaluate the effects of future climate change on marine ecosystems. The Mediterranean is of particular importance, because of its crucial role in modern ocean atmosphere phenomena such as the North...
Main Authors: | , , , , |
---|---|
Format: | Conference Object |
Language: | unknown |
Published: |
2016
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/41045/ https://epic.awi.de/id/eprint/41045/1/Poster_GvonLeesen_ISC2016.pdf https://hdl.handle.net/10013/epic.48014 https://hdl.handle.net/10013/epic.48014.d001 |
id |
ftawi:oai:epic.awi.de:41045 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:41045 2024-09-15T17:54:29+00:00 The Mediterranean Sea during the Pleistocene – bivalve shells and their potential to reconstruct decadal and seasonal climate signals of the past von Leesen, Gotje Beierlein, Lars Scarponi, Daniele Schöne, Bernd R. Brey, Thomas 2016-06-06 application/pdf https://epic.awi.de/id/eprint/41045/ https://epic.awi.de/id/eprint/41045/1/Poster_GvonLeesen_ISC2016.pdf https://hdl.handle.net/10013/epic.48014 https://hdl.handle.net/10013/epic.48014.d001 unknown https://epic.awi.de/id/eprint/41045/1/Poster_GvonLeesen_ISC2016.pdf https://hdl.handle.net/10013/epic.48014.d001 von Leesen, G. , Beierlein, L. , Scarponi, D. , Schöne, B. R. and Brey, T. orcid:0000-0002-6345-2851 (2016) The Mediterranean Sea during the Pleistocene – bivalve shells and their potential to reconstruct decadal and seasonal climate signals of the past , 4th International Sclerochronology Conference, Portland, Maine, USA, 5 June 2016 - 9 June 2016 . hdl:10013/epic.48014 EPIC34th International Sclerochronology Conference, Portland, Maine, USA, 2016-06-05-2016-06-09 Conference notRev 2016 ftawi 2024-06-24T04:14:20Z Understanding the climate of the past, in particular seasonal temperature amplitudes, is essential to evaluate the effects of future climate change on marine ecosystems. The Mediterranean is of particular importance, because of its crucial role in modern ocean atmosphere phenomena such as the North Atlantic Oscillation (NAO). We analyzed fossil shells of the bivalve Arctica islandica collected from Pleistocene successions in Central and Southern Italy (i.e., Rome, Lecce and Sicily). According to preliminary biostratigraphic data the studied deposits belong to the middle Calabrian, between 1.2-0.9 Ma for the Sicily outcrop and 1.4-1.2 Ma for the Rome and Lecce outcrops. Prior to isotope geochemical analysis confocal Raman microscopy measurements were conducted to detect potential diagenetic alterations (e.g., from aragonite to calcite). The seasonal water temperature amplitude was reconstructed using stable oxygen isotope (δ18O) values, which were derived by micro-milling and Isotope Ratio Mass Spectrometry. Analysis of the growth patterns (on-going research) revealed ontogenetic ages of up to 210 years. These time series are used for the identification of multi-year (i.e., decadal) patterns, such as the NAO. First results of our study indicate that seasonality was remarkably low during the studied geological epoch. This is in sharp contrast to previous assumptions according to which the simultaneous occurrence of boreal (A. islandica) and warm-water species in the Mediterranean Sea during the Pleistocene can be explained by high seasonality. Different links and scenarios on a regional as well as a bigger scale will be discussed. Conference Object Arctica islandica North Atlantic North Atlantic oscillation Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Understanding the climate of the past, in particular seasonal temperature amplitudes, is essential to evaluate the effects of future climate change on marine ecosystems. The Mediterranean is of particular importance, because of its crucial role in modern ocean atmosphere phenomena such as the North Atlantic Oscillation (NAO). We analyzed fossil shells of the bivalve Arctica islandica collected from Pleistocene successions in Central and Southern Italy (i.e., Rome, Lecce and Sicily). According to preliminary biostratigraphic data the studied deposits belong to the middle Calabrian, between 1.2-0.9 Ma for the Sicily outcrop and 1.4-1.2 Ma for the Rome and Lecce outcrops. Prior to isotope geochemical analysis confocal Raman microscopy measurements were conducted to detect potential diagenetic alterations (e.g., from aragonite to calcite). The seasonal water temperature amplitude was reconstructed using stable oxygen isotope (δ18O) values, which were derived by micro-milling and Isotope Ratio Mass Spectrometry. Analysis of the growth patterns (on-going research) revealed ontogenetic ages of up to 210 years. These time series are used for the identification of multi-year (i.e., decadal) patterns, such as the NAO. First results of our study indicate that seasonality was remarkably low during the studied geological epoch. This is in sharp contrast to previous assumptions according to which the simultaneous occurrence of boreal (A. islandica) and warm-water species in the Mediterranean Sea during the Pleistocene can be explained by high seasonality. Different links and scenarios on a regional as well as a bigger scale will be discussed. |
format |
Conference Object |
author |
von Leesen, Gotje Beierlein, Lars Scarponi, Daniele Schöne, Bernd R. Brey, Thomas |
spellingShingle |
von Leesen, Gotje Beierlein, Lars Scarponi, Daniele Schöne, Bernd R. Brey, Thomas The Mediterranean Sea during the Pleistocene – bivalve shells and their potential to reconstruct decadal and seasonal climate signals of the past |
author_facet |
von Leesen, Gotje Beierlein, Lars Scarponi, Daniele Schöne, Bernd R. Brey, Thomas |
author_sort |
von Leesen, Gotje |
title |
The Mediterranean Sea during the Pleistocene – bivalve shells and their potential to reconstruct decadal and seasonal climate signals of the past |
title_short |
The Mediterranean Sea during the Pleistocene – bivalve shells and their potential to reconstruct decadal and seasonal climate signals of the past |
title_full |
The Mediterranean Sea during the Pleistocene – bivalve shells and their potential to reconstruct decadal and seasonal climate signals of the past |
title_fullStr |
The Mediterranean Sea during the Pleistocene – bivalve shells and their potential to reconstruct decadal and seasonal climate signals of the past |
title_full_unstemmed |
The Mediterranean Sea during the Pleistocene – bivalve shells and their potential to reconstruct decadal and seasonal climate signals of the past |
title_sort |
mediterranean sea during the pleistocene – bivalve shells and their potential to reconstruct decadal and seasonal climate signals of the past |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/41045/ https://epic.awi.de/id/eprint/41045/1/Poster_GvonLeesen_ISC2016.pdf https://hdl.handle.net/10013/epic.48014 https://hdl.handle.net/10013/epic.48014.d001 |
genre |
Arctica islandica North Atlantic North Atlantic oscillation |
genre_facet |
Arctica islandica North Atlantic North Atlantic oscillation |
op_source |
EPIC34th International Sclerochronology Conference, Portland, Maine, USA, 2016-06-05-2016-06-09 |
op_relation |
https://epic.awi.de/id/eprint/41045/1/Poster_GvonLeesen_ISC2016.pdf https://hdl.handle.net/10013/epic.48014.d001 von Leesen, G. , Beierlein, L. , Scarponi, D. , Schöne, B. R. and Brey, T. orcid:0000-0002-6345-2851 (2016) The Mediterranean Sea during the Pleistocene – bivalve shells and their potential to reconstruct decadal and seasonal climate signals of the past , 4th International Sclerochronology Conference, Portland, Maine, USA, 5 June 2016 - 9 June 2016 . hdl:10013/epic.48014 |
_version_ |
1810430807651647488 |