Holocene environmental changes in Dicksonfjorden, west Spitsbergen, Svalbard
Multi-proxy analyses of two sediment cores from Dicksonfjorden were performed to reconstruct Holocene environmental conditions in this northern branch of Isfjorden, the largest fjord system in Svalbard. Factors affecting the depositional processes include shifts in sources of sediments, ice rafting...
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Norwegian Polar Institute
2019
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Online Access: | https://doi.org/10.33265/polar.v38.3426 https://doaj.org/article/bb33e2c412ff4b5fae1fdb2e9cfb9f78 |
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ftdoajarticles:oai:doaj.org/article:bb33e2c412ff4b5fae1fdb2e9cfb9f78 2023-05-15T16:55:56+02:00 Holocene environmental changes in Dicksonfjorden, west Spitsbergen, Svalbard Young Ji Joo Matthias Forwick Kwangkyu Park Youngjin Joe Yeong Ju Son Seung-Il Nam 2019-09-01T00:00:00Z https://doi.org/10.33265/polar.v38.3426 https://doaj.org/article/bb33e2c412ff4b5fae1fdb2e9cfb9f78 EN eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/3426/9407 https://doaj.org/toc/1751-8369 1751-8369 doi:10.33265/polar.v38.3426 https://doaj.org/article/bb33e2c412ff4b5fae1fdb2e9cfb9f78 Polar Research, Vol 38, Iss 0, Pp 1-14 (2019) Svalbard fjord ice rafting geochemistry granulometry sea ice Environmental sciences GE1-350 Oceanography GC1-1581 article 2019 ftdoajarticles https://doi.org/10.33265/polar.v38.3426 2022-12-31T03:16:48Z Multi-proxy analyses of two sediment cores from Dicksonfjorden were performed to reconstruct Holocene environmental conditions in this northern branch of Isfjorden, the largest fjord system in Svalbard. Factors affecting the depositional processes include shifts in sources of sediments, ice rafting and regional glacio-isostatic rebound. Sediments were derived from Palaeozoic siliciclastics and carbonates occurring at the fjord head and sides, respectively. Their relative contributions were controlled by falling relative sea level and the resulting progradation of the major stream and delta systems closer to the core sites. Deposition of clasts from sea-ice rafting persisted throughout most of the Holocene. Following a period of low, but continuous, clast fluxes (ca. 11 000–7000 calibrated years before the present), ice rafting was most intensive between ca. 7000 and 3000 calibrated years before the present. It can be related to extensive seasonal sea-ice formation caused by regional cooling. The prograding deltas also provided coarse sediments. Reduced ice rafting from ca. 3000 calibrated years before the present suggests enhanced formation of shorefast and/or permanent sea ice, suppressing sea-ice rafting in the fjord, in response to the cool climate and reduced heat flux from Atlantic Water. Episodic inflow of Atlantic Water and low turbidity of surface water can, however, account for a larger amount of marine organic matter produced in the outer fjord. The sedimentary record in Dicksonfjorden, where tidewater glaciers are absent, reflects similar climate and oceanographic variations as reconstructed in fjords on western Spitsbergen that are influenced by tidewater glaciers. Article in Journal/Newspaper Isfjord* Isfjord* Isfjorden Isfjorden Polar Research Sea ice Svalbard Spitsbergen Directory of Open Access Journals: DOAJ Articles Dicksonfjorden ENVELOPE(15.291,15.291,78.710,78.710) Svalbard Polar Research 38 0 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Svalbard fjord ice rafting geochemistry granulometry sea ice Environmental sciences GE1-350 Oceanography GC1-1581 |
spellingShingle |
Svalbard fjord ice rafting geochemistry granulometry sea ice Environmental sciences GE1-350 Oceanography GC1-1581 Young Ji Joo Matthias Forwick Kwangkyu Park Youngjin Joe Yeong Ju Son Seung-Il Nam Holocene environmental changes in Dicksonfjorden, west Spitsbergen, Svalbard |
topic_facet |
Svalbard fjord ice rafting geochemistry granulometry sea ice Environmental sciences GE1-350 Oceanography GC1-1581 |
description |
Multi-proxy analyses of two sediment cores from Dicksonfjorden were performed to reconstruct Holocene environmental conditions in this northern branch of Isfjorden, the largest fjord system in Svalbard. Factors affecting the depositional processes include shifts in sources of sediments, ice rafting and regional glacio-isostatic rebound. Sediments were derived from Palaeozoic siliciclastics and carbonates occurring at the fjord head and sides, respectively. Their relative contributions were controlled by falling relative sea level and the resulting progradation of the major stream and delta systems closer to the core sites. Deposition of clasts from sea-ice rafting persisted throughout most of the Holocene. Following a period of low, but continuous, clast fluxes (ca. 11 000–7000 calibrated years before the present), ice rafting was most intensive between ca. 7000 and 3000 calibrated years before the present. It can be related to extensive seasonal sea-ice formation caused by regional cooling. The prograding deltas also provided coarse sediments. Reduced ice rafting from ca. 3000 calibrated years before the present suggests enhanced formation of shorefast and/or permanent sea ice, suppressing sea-ice rafting in the fjord, in response to the cool climate and reduced heat flux from Atlantic Water. Episodic inflow of Atlantic Water and low turbidity of surface water can, however, account for a larger amount of marine organic matter produced in the outer fjord. The sedimentary record in Dicksonfjorden, where tidewater glaciers are absent, reflects similar climate and oceanographic variations as reconstructed in fjords on western Spitsbergen that are influenced by tidewater glaciers. |
format |
Article in Journal/Newspaper |
author |
Young Ji Joo Matthias Forwick Kwangkyu Park Youngjin Joe Yeong Ju Son Seung-Il Nam |
author_facet |
Young Ji Joo Matthias Forwick Kwangkyu Park Youngjin Joe Yeong Ju Son Seung-Il Nam |
author_sort |
Young Ji Joo |
title |
Holocene environmental changes in Dicksonfjorden, west Spitsbergen, Svalbard |
title_short |
Holocene environmental changes in Dicksonfjorden, west Spitsbergen, Svalbard |
title_full |
Holocene environmental changes in Dicksonfjorden, west Spitsbergen, Svalbard |
title_fullStr |
Holocene environmental changes in Dicksonfjorden, west Spitsbergen, Svalbard |
title_full_unstemmed |
Holocene environmental changes in Dicksonfjorden, west Spitsbergen, Svalbard |
title_sort |
holocene environmental changes in dicksonfjorden, west spitsbergen, svalbard |
publisher |
Norwegian Polar Institute |
publishDate |
2019 |
url |
https://doi.org/10.33265/polar.v38.3426 https://doaj.org/article/bb33e2c412ff4b5fae1fdb2e9cfb9f78 |
long_lat |
ENVELOPE(15.291,15.291,78.710,78.710) |
geographic |
Dicksonfjorden Svalbard |
geographic_facet |
Dicksonfjorden Svalbard |
genre |
Isfjord* Isfjord* Isfjorden Isfjorden Polar Research Sea ice Svalbard Spitsbergen |
genre_facet |
Isfjord* Isfjord* Isfjorden Isfjorden Polar Research Sea ice Svalbard Spitsbergen |
op_source |
Polar Research, Vol 38, Iss 0, Pp 1-14 (2019) |
op_relation |
https://polarresearch.net/index.php/polar/article/view/3426/9407 https://doaj.org/toc/1751-8369 1751-8369 doi:10.33265/polar.v38.3426 https://doaj.org/article/bb33e2c412ff4b5fae1fdb2e9cfb9f78 |
op_doi |
https://doi.org/10.33265/polar.v38.3426 |
container_title |
Polar Research |
container_volume |
38 |
container_issue |
0 |
_version_ |
1766046976327024640 |