Density of 9 sediment cores from the Weddell Sea
The wet bulk density is one of the most important parameters of the physical and geological properties of marine sediments. The density is connected directly with sedimentation history and a few sedirnent properties. Knowledge of the fine scale density-depth structure is the base for many model calc...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.818320 2024-09-15T17:59:14+00:00 Density of 9 sediment cores from the Weddell Sea Gerland, Sebastian MEDIAN LATITUDE: -19.657727 * MEDIAN LONGITUDE: -1.173296 * SOUTH-BOUND LATITUDE: -71.389330 * WEST-BOUND LONGITUDE: -24.158910 * NORTH-BOUND LATITUDE: 70.122000 * EAST-BOUND LONGITUDE: 34.300000 * DATE/TIME START: 1988-08-11T00:00:00 * DATE/TIME END: 1991-04-08T12:49:00 1993 application/zip, 9 datasets https://doi.pangaea.de/10.1594/PANGAEA.818320 https://doi.org/10.1594/PANGAEA.818320 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.818320 https://doi.org/10.1594/PANGAEA.818320 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Gerland, Sebastian (1993): Zerstörungsfreie hochauflösende Dichteuntersuchungen mariner Sedimente (Non-destructive high resolution density measurements on marine sediments). Berichte zur Polarforschung = Reports on Polar Research, 123, 130 pp, https://doi.org/10.2312/BzP_0123_1993 AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI dataset publication series 1993 ftpangaea https://doi.org/10.1594/PANGAEA.81832010.2312/BzP_0123_1993 2024-07-24T02:31:21Z The wet bulk density is one of the most important parameters of the physical and geological properties of marine sediments. The density is connected directly with sedimentation history and a few sedirnent properties. Knowledge of the fine scale density-depth structure is the base for many model calculations, for both sedimentological and palaeoclimatic research. A density measurement system was designed and built at the Alfred Wegener Institute in Bremerhaven for measuring the wet buk density of sediment cores with high resolution in a non-destructive way. The density is deterrnined by measuring the absorption of Gamma-rays in the sediment. This principle has been used since the 50's in materials research and in the geosciences. In the present case, Cs137 is used as the radioactive source and the intensity is measured by a detector system (scintillator and photomultiplier). Density values are obtainable in both longitudinal core sections and planar cross-sections (the latter are a function of the axial rotation angle). Special studies on inhomogenity can be applied with core rotation. Detection of ice rafted debris (IRD) is made possible with this option. The processes that run the density measurement system are computer controlled. Besides the absorption measurement the core diameter at every measurement point is determined with a potentiometric system. The data values taken are stored on a personal computer. Before starting routine measurements on the sediment cores, a few experiments conceming the statistical aspects of the gamma-ray signal and its accuracy were carried out. These experiments led to such things as the optimum operational parameters. A high spatial resolution in the mm-range is possible with the 4mm-thin gamma-ray measurements. Within five seconds the wet bulk density can be deterrnined with an absolute accuracy of 1%. A comparison between data measured with the new system and conventional measurements on core samples after core splitting shows an agreement within +I- 5% for most of the ... Other/Unknown Material Berichte zur Polarforschung Polar Research Polarforschung Reports on polar research Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-24.158910,34.300000,70.122000,-71.389330) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI |
spellingShingle |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI Gerland, Sebastian Density of 9 sediment cores from the Weddell Sea |
topic_facet |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI |
description |
The wet bulk density is one of the most important parameters of the physical and geological properties of marine sediments. The density is connected directly with sedimentation history and a few sedirnent properties. Knowledge of the fine scale density-depth structure is the base for many model calculations, for both sedimentological and palaeoclimatic research. A density measurement system was designed and built at the Alfred Wegener Institute in Bremerhaven for measuring the wet buk density of sediment cores with high resolution in a non-destructive way. The density is deterrnined by measuring the absorption of Gamma-rays in the sediment. This principle has been used since the 50's in materials research and in the geosciences. In the present case, Cs137 is used as the radioactive source and the intensity is measured by a detector system (scintillator and photomultiplier). Density values are obtainable in both longitudinal core sections and planar cross-sections (the latter are a function of the axial rotation angle). Special studies on inhomogenity can be applied with core rotation. Detection of ice rafted debris (IRD) is made possible with this option. The processes that run the density measurement system are computer controlled. Besides the absorption measurement the core diameter at every measurement point is determined with a potentiometric system. The data values taken are stored on a personal computer. Before starting routine measurements on the sediment cores, a few experiments conceming the statistical aspects of the gamma-ray signal and its accuracy were carried out. These experiments led to such things as the optimum operational parameters. A high spatial resolution in the mm-range is possible with the 4mm-thin gamma-ray measurements. Within five seconds the wet bulk density can be deterrnined with an absolute accuracy of 1%. A comparison between data measured with the new system and conventional measurements on core samples after core splitting shows an agreement within +I- 5% for most of the ... |
format |
Other/Unknown Material |
author |
Gerland, Sebastian |
author_facet |
Gerland, Sebastian |
author_sort |
Gerland, Sebastian |
title |
Density of 9 sediment cores from the Weddell Sea |
title_short |
Density of 9 sediment cores from the Weddell Sea |
title_full |
Density of 9 sediment cores from the Weddell Sea |
title_fullStr |
Density of 9 sediment cores from the Weddell Sea |
title_full_unstemmed |
Density of 9 sediment cores from the Weddell Sea |
title_sort |
density of 9 sediment cores from the weddell sea |
publisher |
PANGAEA |
publishDate |
1993 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.818320 https://doi.org/10.1594/PANGAEA.818320 |
op_coverage |
MEDIAN LATITUDE: -19.657727 * MEDIAN LONGITUDE: -1.173296 * SOUTH-BOUND LATITUDE: -71.389330 * WEST-BOUND LONGITUDE: -24.158910 * NORTH-BOUND LATITUDE: 70.122000 * EAST-BOUND LONGITUDE: 34.300000 * DATE/TIME START: 1988-08-11T00:00:00 * DATE/TIME END: 1991-04-08T12:49:00 |
long_lat |
ENVELOPE(-24.158910,34.300000,70.122000,-71.389330) |
genre |
Berichte zur Polarforschung Polar Research Polarforschung Reports on polar research Weddell Sea |
genre_facet |
Berichte zur Polarforschung Polar Research Polarforschung Reports on polar research Weddell Sea |
op_source |
Supplement to: Gerland, Sebastian (1993): Zerstörungsfreie hochauflösende Dichteuntersuchungen mariner Sedimente (Non-destructive high resolution density measurements on marine sediments). Berichte zur Polarforschung = Reports on Polar Research, 123, 130 pp, https://doi.org/10.2312/BzP_0123_1993 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.818320 https://doi.org/10.1594/PANGAEA.818320 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.81832010.2312/BzP_0123_1993 |
_version_ |
1810436278972317696 |