Sediment color variation and annual accumulation rates in laminated holocene sediments, site 1098, Palmer deep
Continuous sediment color records with a resolution of one measurement per millimeter were generated for Site 1098 (Palmer Deep, Antarctic Peninsula) from digital images of the core surfaces to test if the laminated intervals at this site will allow for analysis of high-frequency climate variability...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:42631 2023-05-15T13:59:47+02:00 Sediment color variation and annual accumulation rates in laminated holocene sediments, site 1098, Palmer deep Nederbragt, AJ Thurow, J 2002-12-01 http://discovery.ucl.ac.uk/42631/ unknown Report 2002 ftucl 2017-05-11T22:10:53Z Continuous sediment color records with a resolution of one measurement per millimeter were generated for Site 1098 (Palmer Deep, Antarctic Peninsula) from digital images of the core surfaces to test if the laminated intervals at this site will allow for analysis of high-frequency climate variability in the Circum-Antarctic. Long-term variation in color values correlates with gamma-ray attenuation bulk density. Darker colors are found in laminated intervals with lower bulk density, high biogenic silica, and high total organic carbon content. Darker color values result from the addition of dark laminae to background sediments that show little variation in color. The thicknesses of dark and light laminae were measured in the top 25 meters composite depth to determine the temporal resolution of the laminae. The alternation between dark, biogenic-rich laminae and background sediment essentially represents an annual cycle, but the sediment is not consistently varved. The modal thickness of light laminae is close to the long-term average annual accumulation rate, and results indicate that approximately half of the dark/light couplets in distinctly laminated intervals represent a single year. Missing biogenic laminae are interpreted to represent reduced primary productivity during cold years with delayed breakup of the sea-ice cover. Report Antarc* Antarctic Antarctic Peninsula Sea ice University College London: UCL Discovery Antarctic Antarctic Peninsula Palmer Deep ENVELOPE(-64.400,-64.400,-64.950,-64.950) |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
unknown |
description |
Continuous sediment color records with a resolution of one measurement per millimeter were generated for Site 1098 (Palmer Deep, Antarctic Peninsula) from digital images of the core surfaces to test if the laminated intervals at this site will allow for analysis of high-frequency climate variability in the Circum-Antarctic. Long-term variation in color values correlates with gamma-ray attenuation bulk density. Darker colors are found in laminated intervals with lower bulk density, high biogenic silica, and high total organic carbon content. Darker color values result from the addition of dark laminae to background sediments that show little variation in color. The thicknesses of dark and light laminae were measured in the top 25 meters composite depth to determine the temporal resolution of the laminae. The alternation between dark, biogenic-rich laminae and background sediment essentially represents an annual cycle, but the sediment is not consistently varved. The modal thickness of light laminae is close to the long-term average annual accumulation rate, and results indicate that approximately half of the dark/light couplets in distinctly laminated intervals represent a single year. Missing biogenic laminae are interpreted to represent reduced primary productivity during cold years with delayed breakup of the sea-ice cover. |
format |
Report |
author |
Nederbragt, AJ Thurow, J |
spellingShingle |
Nederbragt, AJ Thurow, J Sediment color variation and annual accumulation rates in laminated holocene sediments, site 1098, Palmer deep |
author_facet |
Nederbragt, AJ Thurow, J |
author_sort |
Nederbragt, AJ |
title |
Sediment color variation and annual accumulation rates in laminated holocene sediments, site 1098, Palmer deep |
title_short |
Sediment color variation and annual accumulation rates in laminated holocene sediments, site 1098, Palmer deep |
title_full |
Sediment color variation and annual accumulation rates in laminated holocene sediments, site 1098, Palmer deep |
title_fullStr |
Sediment color variation and annual accumulation rates in laminated holocene sediments, site 1098, Palmer deep |
title_full_unstemmed |
Sediment color variation and annual accumulation rates in laminated holocene sediments, site 1098, Palmer deep |
title_sort |
sediment color variation and annual accumulation rates in laminated holocene sediments, site 1098, palmer deep |
publishDate |
2002 |
url |
http://discovery.ucl.ac.uk/42631/ |
long_lat |
ENVELOPE(-64.400,-64.400,-64.950,-64.950) |
geographic |
Antarctic Antarctic Peninsula Palmer Deep |
geographic_facet |
Antarctic Antarctic Peninsula Palmer Deep |
genre |
Antarc* Antarctic Antarctic Peninsula Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Sea ice |
_version_ |
1766268618794860544 |