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 and past seasonal temperature amplitudes is essential to evaluate the effects of future climate change on marine ecosystems. The Mediterranean Sea is of great importance due to its crucial role in modern atmospheric phenomena such as the North Atlantic Oscillati...
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ftawi:oai:epic.awi.de:43124 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 2016 application/pdf https://epic.awi.de/id/eprint/43124/ https://epic.awi.de/id/eprint/43124/1/MasterThesis_GotjevonLeesen.pdf https://hdl.handle.net/10013/epic.49620 https://hdl.handle.net/10013/epic.49620.d001 unknown https://epic.awi.de/id/eprint/43124/1/MasterThesis_GotjevonLeesen.pdf https://hdl.handle.net/10013/epic.49620.d001 von Leesen, G. (2016) The Mediterranean Sea during the Pleistocene - bivalve shells and their potential to reconstruct decadal and seasonal climate signals of the past Master thesis, hdl:10013/epic.49620 EPIC3 Thesis notRev 2016 ftawi 2024-06-24T04:16:35Z Understanding the climate of the past and past seasonal temperature amplitudes is essential to evaluate the effects of future climate change on marine ecosystems. The Mediterranean Sea is of great importance due to its crucial role in modern atmospheric phenomena such as the North Atlantic Oscillation (NAO). Fossil shells of the bivalve Arctica islandica were collected from three different Pleistocene successions in Italy. The seasonal water temperature amplitude was reconstructed using stable oxygen isotope (δ18Oshell) analysis. Samples were derived by the micro-milling approach and measured by isotope ratio mass spectrometer. Results show a low seasonality scenario (~3°C). This is in sharp contrast to the assumption that the simultaneous occurrence of boreal and warm-water species in the middle Calabrian Mediterranean Sea can be explained by high seasonality (~10°C). A prominent 6-year cyclicity was identified in the shell growth time-series by means of spectral analysis. This signal might be linked to the NAO whose periodicity ranges between 5-9 years. However, a connection to the Mediterranean Oscillation cannot be excluded. The low seasonality (~3°C) and the relatively low mean water temperature (9-10°C) indicate that the middle Calabrian Mediterranean Sea was characterized by colder climatic conditions compared to nowadays, indicating a maximum glacial phase. Thesis Arctica islandica North Atlantic North Atlantic oscillation Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Understanding the climate of the past and past seasonal temperature amplitudes is essential to evaluate the effects of future climate change on marine ecosystems. The Mediterranean Sea is of great importance due to its crucial role in modern atmospheric phenomena such as the North Atlantic Oscillation (NAO). Fossil shells of the bivalve Arctica islandica were collected from three different Pleistocene successions in Italy. The seasonal water temperature amplitude was reconstructed using stable oxygen isotope (δ18Oshell) analysis. Samples were derived by the micro-milling approach and measured by isotope ratio mass spectrometer. Results show a low seasonality scenario (~3°C). This is in sharp contrast to the assumption that the simultaneous occurrence of boreal and warm-water species in the middle Calabrian Mediterranean Sea can be explained by high seasonality (~10°C). A prominent 6-year cyclicity was identified in the shell growth time-series by means of spectral analysis. This signal might be linked to the NAO whose periodicity ranges between 5-9 years. However, a connection to the Mediterranean Oscillation cannot be excluded. The low seasonality (~3°C) and the relatively low mean water temperature (9-10°C) indicate that the middle Calabrian Mediterranean Sea was characterized by colder climatic conditions compared to nowadays, indicating a maximum glacial phase. |
format |
Thesis |
author |
von Leesen, Gotje |
spellingShingle |
von Leesen, Gotje 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 |
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/43124/ https://epic.awi.de/id/eprint/43124/1/MasterThesis_GotjevonLeesen.pdf https://hdl.handle.net/10013/epic.49620 https://hdl.handle.net/10013/epic.49620.d001 |
genre |
Arctica islandica North Atlantic North Atlantic oscillation |
genre_facet |
Arctica islandica North Atlantic North Atlantic oscillation |
op_source |
EPIC3 |
op_relation |
https://epic.awi.de/id/eprint/43124/1/MasterThesis_GotjevonLeesen.pdf https://hdl.handle.net/10013/epic.49620.d001 von Leesen, G. (2016) The Mediterranean Sea during the Pleistocene - bivalve shells and their potential to reconstruct decadal and seasonal climate signals of the past Master thesis, hdl:10013/epic.49620 |
_version_ |
1810430805132967936 |