Opal chemistry of costal Antarctic sediments
During the last 50 years, the Antarctic Peninsula has experienced rapid warming with associated retreat of 87% of marine and tidewater glacier fronts. Accelerated glacial retreat and iceberg calving may have a significant impact on the freshwater and nutrient supply to the phytoplankton communities...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.832344 2023-05-15T13:42:11+02:00 Opal chemistry of costal Antarctic sediments Hendry, Katharine R Rickaby, Rosalind E M MEDIAN LATITUDE: -67.698476 * MEDIAN LONGITUDE: -68.870857 * SOUTH-BOUND LATITUDE: -68.030000 * WEST-BOUND LONGITUDE: -71.200000 * NORTH-BOUND LATITUDE: -66.720000 * EAST-BOUND LONGITUDE: -68.190000 2008-05-07 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.832344 https://doi.org/10.1594/PANGAEA.832344 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.832344 https://doi.org/10.1594/PANGAEA.832344 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Hendry, Katharine R; Rickaby, Rosalind E M (2008): Opal (Zn/Si) ratios as a nearshore geochemical proxy in coastal Antarctica. Paleoceanography, 23(2), PA2218, https://doi.org/10.1029/2007PA001576 Dataset 2008 ftpangaea https://doi.org/10.1594/PANGAEA.832344 https://doi.org/10.1029/2007PA001576 2023-01-20T07:33:17Z During the last 50 years, the Antarctic Peninsula has experienced rapid warming with associated retreat of 87% of marine and tidewater glacier fronts. Accelerated glacial retreat and iceberg calving may have a significant impact on the freshwater and nutrient supply to the phytoplankton communities of the highly productive coastal regions. However, commonly used biogenic carbonate proxies for nutrient and salinity conditions are not preserved in sediments from coastal Antarctica. Here we describe a method for the measurement of zinc to silicon ratios in diatom opal, (Zn/Si)opal, which is a potential archive in Antarctic marine sediments. A core top calibration from the West Antarctic Peninsula shows (Zn/Si)opal is a proxy for mixed layer salinity. We present down-core (Zn/Si)opal paleosalinity records from two rapidly accumulating sites taken from nearshore environments off the West Antarctic Peninsula which show an increase in meltwater input in recent decades. Our records show that the recent melting in this region is unprecedented for over 120 years. Dataset Antarc* Antarctic Antarctic Peninsula Antarctica Iceberg* Tidewater PANGAEA - Data Publisher for Earth & Environmental Science Antarctic The Antarctic Antarctic Peninsula ENVELOPE(-71.200000,-68.190000,-66.720000,-68.030000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
During the last 50 years, the Antarctic Peninsula has experienced rapid warming with associated retreat of 87% of marine and tidewater glacier fronts. Accelerated glacial retreat and iceberg calving may have a significant impact on the freshwater and nutrient supply to the phytoplankton communities of the highly productive coastal regions. However, commonly used biogenic carbonate proxies for nutrient and salinity conditions are not preserved in sediments from coastal Antarctica. Here we describe a method for the measurement of zinc to silicon ratios in diatom opal, (Zn/Si)opal, which is a potential archive in Antarctic marine sediments. A core top calibration from the West Antarctic Peninsula shows (Zn/Si)opal is a proxy for mixed layer salinity. We present down-core (Zn/Si)opal paleosalinity records from two rapidly accumulating sites taken from nearshore environments off the West Antarctic Peninsula which show an increase in meltwater input in recent decades. Our records show that the recent melting in this region is unprecedented for over 120 years. |
format |
Dataset |
author |
Hendry, Katharine R Rickaby, Rosalind E M |
spellingShingle |
Hendry, Katharine R Rickaby, Rosalind E M Opal chemistry of costal Antarctic sediments |
author_facet |
Hendry, Katharine R Rickaby, Rosalind E M |
author_sort |
Hendry, Katharine R |
title |
Opal chemistry of costal Antarctic sediments |
title_short |
Opal chemistry of costal Antarctic sediments |
title_full |
Opal chemistry of costal Antarctic sediments |
title_fullStr |
Opal chemistry of costal Antarctic sediments |
title_full_unstemmed |
Opal chemistry of costal Antarctic sediments |
title_sort |
opal chemistry of costal antarctic sediments |
publisher |
PANGAEA |
publishDate |
2008 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.832344 https://doi.org/10.1594/PANGAEA.832344 |
op_coverage |
MEDIAN LATITUDE: -67.698476 * MEDIAN LONGITUDE: -68.870857 * SOUTH-BOUND LATITUDE: -68.030000 * WEST-BOUND LONGITUDE: -71.200000 * NORTH-BOUND LATITUDE: -66.720000 * EAST-BOUND LONGITUDE: -68.190000 |
long_lat |
ENVELOPE(-71.200000,-68.190000,-66.720000,-68.030000) |
geographic |
Antarctic The Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Iceberg* Tidewater |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Iceberg* Tidewater |
op_source |
Supplement to: Hendry, Katharine R; Rickaby, Rosalind E M (2008): Opal (Zn/Si) ratios as a nearshore geochemical proxy in coastal Antarctica. Paleoceanography, 23(2), PA2218, https://doi.org/10.1029/2007PA001576 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.832344 https://doi.org/10.1594/PANGAEA.832344 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.832344 https://doi.org/10.1029/2007PA001576 |
_version_ |
1766164620423200768 |