Late Quaternary Sedimentation Processes and Sediment Accumulation Changes off Portugal
A multiproxy analysis was carried out on sediments from the Portuguese margin to evaluate the timing and character of environmental changes during the past 10000 years. The Portuguese shelf combines inputs from marine and continental sources and furthermore allows the acquisition of sediments record...
Main Author: | |
---|---|
Other Authors: | , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
Universität Bremen
2008
|
Subjects: | |
Online Access: | https://media.suub.uni-bremen.de/handle/elib/2549 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000111503 |
id |
ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/2549 |
---|---|
record_format |
openpolar |
spelling |
ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/2549 2023-05-15T17:33:23+02:00 Late Quaternary Sedimentation Processes and Sediment Accumulation Changes off Portugal Spaetquartaere Sedimentationsprozesse und Variationen in Sedimentakkumulation vor Portugal Alt-Epping, Ulrich Hebbeln, Dierk Schneider, Ralph 2008-10-02 application/pdf https://media.suub.uni-bremen.de/handle/elib/2549 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000111503 eng eng Universität Bremen FB5 Geowissenschaften https://media.suub.uni-bremen.de/handle/elib/2549 urn:nbn:de:gbv:46-diss000111503 info:eu-repo/semantics/openAccess Portuguese Margin Environmental Changes Grain Size North Atlantic Oscillation Tsunami 550 550 Earth sciences and geology ddc:550 Dissertation doctoralThesis 2008 ftsubbremen 2022-11-09T07:09:50Z A multiproxy analysis was carried out on sediments from the Portuguese margin to evaluate the timing and character of environmental changes during the past 10000 years. The Portuguese shelf combines inputs from marine and continental sources and furthermore allows the acquisition of sediments records with various temporal resolutions, thus allowing a synoptic reconstruction of environmental changes on different timescales.Surface samples show, that continental input is limited to very close to the source, e.g. a river mouth. ROV- and echosound data reveal a very high textural variability of sea floor sediments. High-resolution data from a gravity core from the Tagus Prodelta (GeoB 8903) shows changes in sediment supply and transport mechanisms around 2000yrs BP and 600yrs BP. Grain-size has a dominating effect on other sediment proxies, allowing further conclusions on the interaction between environmental processes and sediment properties. On a long term, shelf sediments are mainly affected by the postglacial sea level rise. The effect of frequent tsunamis varies spatially and is not clearly evident in the sediments. Doctoral or Postdoctoral Thesis North Atlantic North Atlantic oscillation Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
Portuguese Margin Environmental Changes Grain Size North Atlantic Oscillation Tsunami 550 550 Earth sciences and geology ddc:550 |
spellingShingle |
Portuguese Margin Environmental Changes Grain Size North Atlantic Oscillation Tsunami 550 550 Earth sciences and geology ddc:550 Alt-Epping, Ulrich Late Quaternary Sedimentation Processes and Sediment Accumulation Changes off Portugal |
topic_facet |
Portuguese Margin Environmental Changes Grain Size North Atlantic Oscillation Tsunami 550 550 Earth sciences and geology ddc:550 |
description |
A multiproxy analysis was carried out on sediments from the Portuguese margin to evaluate the timing and character of environmental changes during the past 10000 years. The Portuguese shelf combines inputs from marine and continental sources and furthermore allows the acquisition of sediments records with various temporal resolutions, thus allowing a synoptic reconstruction of environmental changes on different timescales.Surface samples show, that continental input is limited to very close to the source, e.g. a river mouth. ROV- and echosound data reveal a very high textural variability of sea floor sediments. High-resolution data from a gravity core from the Tagus Prodelta (GeoB 8903) shows changes in sediment supply and transport mechanisms around 2000yrs BP and 600yrs BP. Grain-size has a dominating effect on other sediment proxies, allowing further conclusions on the interaction between environmental processes and sediment properties. On a long term, shelf sediments are mainly affected by the postglacial sea level rise. The effect of frequent tsunamis varies spatially and is not clearly evident in the sediments. |
author2 |
Hebbeln, Dierk Schneider, Ralph |
format |
Doctoral or Postdoctoral Thesis |
author |
Alt-Epping, Ulrich |
author_facet |
Alt-Epping, Ulrich |
author_sort |
Alt-Epping, Ulrich |
title |
Late Quaternary Sedimentation Processes and Sediment Accumulation Changes off Portugal |
title_short |
Late Quaternary Sedimentation Processes and Sediment Accumulation Changes off Portugal |
title_full |
Late Quaternary Sedimentation Processes and Sediment Accumulation Changes off Portugal |
title_fullStr |
Late Quaternary Sedimentation Processes and Sediment Accumulation Changes off Portugal |
title_full_unstemmed |
Late Quaternary Sedimentation Processes and Sediment Accumulation Changes off Portugal |
title_sort |
late quaternary sedimentation processes and sediment accumulation changes off portugal |
publisher |
Universität Bremen |
publishDate |
2008 |
url |
https://media.suub.uni-bremen.de/handle/elib/2549 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000111503 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/2549 urn:nbn:de:gbv:46-diss000111503 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766131869037887488 |