Holocene Mg/Ca, alkenones, and light stable isotope measurements on the outer North Iceland shelf, sediment core MD99-2269
We present new Holocene century to millennial-scale proxies for the well-dated piston core MD99-2269 from Húnaflóadjúp on the North Iceland Shelf. The core is located in 365 mwd and lies close to the fluctuating boundary between Atlantic and Arctic/Polar waters. The proxies are: alkenone-based SST°C...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.847657 2023-05-15T15:12:26+02:00 Holocene Mg/Ca, alkenones, and light stable isotope measurements on the outer North Iceland shelf, sediment core MD99-2269 Kristjánsdóttir, Greta B Moros, Matthias Andrews, John T Jennings, Anne E LATITUDE: 66.641333 * LONGITUDE: -20.863167 * DATE/TIME START: 1999-08-01T00:00:00 * DATE/TIME END: 1999-08-01T00:00:00 2015-06-30 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.847657 https://doi.org/10.1594/PANGAEA.847657 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.847657 https://doi.org/10.1594/PANGAEA.847657 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Kristjánsdóttir, Greta B; Moros, Matthias; Andrews, John T; Jennings, Anne E (2016): Holocene Mg/Ca, alkenones, and light stable isotope measurements on the outer North Iceland shelf (MD99-2269): A comparison of proxy data. The Holocene, 27(1), 52-62, https://doi.org/10.1177/0959683616652703 79US/Fr CALYPSO Calypso Corer IMAGES V Marion Dufresne (1995) MD114 MD99-2269 N.Iceland shelf Reykjafjardarall Dataset 2015 ftpangaea https://doi.org/10.1594/PANGAEA.847657 https://doi.org/10.1177/0959683616652703 2023-01-20T07:33:28Z We present new Holocene century to millennial-scale proxies for the well-dated piston core MD99-2269 from Húnaflóadjúp on the North Iceland Shelf. The core is located in 365 mwd and lies close to the fluctuating boundary between Atlantic and Arctic/Polar waters. The proxies are: alkenone-based SST°C, and Mg/Ca SST°C estimates and stable d13C and d18O values on planktonic and benthic foraminifera. The data were converted to 60 yr equi-spaced time-series. Significant trends in the data were extracted using Singular Spectrum Analysis and these accounted for between 50% and 70% of the variance. A comparison between these data with previously published climate proxies from MD99-2269 was carried out on a data set which consisted of 14-variable data set covering the interval 400-9200 cal yr BP at 100 yr time steps. This analysis indicated that the 1st two PC axes accounted for 57% of the variability with high loadings clustering primarily into "nutrient" and "temperature" proxies. Clustering on the 100 yr time-series indicated major changes in environment at ~6350 and ~3450 cal yr BP, which define early, mid- and late Holocene climatic intervals. We argue that a pervasive freshwater cap during the early Holocene resulted in warm SST°s, a stratified water column, and a depleted nutrient supply. The loss of the freshwater layer in the mid-Holocene resulted in high carbonate production, and the late Holocene/neoglacial interval was marked by significantly more variable sea surface conditions. Dataset Arctic Foraminifera* Iceland PANGAEA - Data Publisher for Earth & Environmental Science Arctic ENVELOPE(-20.863167,-20.863167,66.641333,66.641333) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
79US/Fr CALYPSO Calypso Corer IMAGES V Marion Dufresne (1995) MD114 MD99-2269 N.Iceland shelf Reykjafjardarall |
spellingShingle |
79US/Fr CALYPSO Calypso Corer IMAGES V Marion Dufresne (1995) MD114 MD99-2269 N.Iceland shelf Reykjafjardarall Kristjánsdóttir, Greta B Moros, Matthias Andrews, John T Jennings, Anne E Holocene Mg/Ca, alkenones, and light stable isotope measurements on the outer North Iceland shelf, sediment core MD99-2269 |
topic_facet |
79US/Fr CALYPSO Calypso Corer IMAGES V Marion Dufresne (1995) MD114 MD99-2269 N.Iceland shelf Reykjafjardarall |
description |
We present new Holocene century to millennial-scale proxies for the well-dated piston core MD99-2269 from Húnaflóadjúp on the North Iceland Shelf. The core is located in 365 mwd and lies close to the fluctuating boundary between Atlantic and Arctic/Polar waters. The proxies are: alkenone-based SST°C, and Mg/Ca SST°C estimates and stable d13C and d18O values on planktonic and benthic foraminifera. The data were converted to 60 yr equi-spaced time-series. Significant trends in the data were extracted using Singular Spectrum Analysis and these accounted for between 50% and 70% of the variance. A comparison between these data with previously published climate proxies from MD99-2269 was carried out on a data set which consisted of 14-variable data set covering the interval 400-9200 cal yr BP at 100 yr time steps. This analysis indicated that the 1st two PC axes accounted for 57% of the variability with high loadings clustering primarily into "nutrient" and "temperature" proxies. Clustering on the 100 yr time-series indicated major changes in environment at ~6350 and ~3450 cal yr BP, which define early, mid- and late Holocene climatic intervals. We argue that a pervasive freshwater cap during the early Holocene resulted in warm SST°s, a stratified water column, and a depleted nutrient supply. The loss of the freshwater layer in the mid-Holocene resulted in high carbonate production, and the late Holocene/neoglacial interval was marked by significantly more variable sea surface conditions. |
format |
Dataset |
author |
Kristjánsdóttir, Greta B Moros, Matthias Andrews, John T Jennings, Anne E |
author_facet |
Kristjánsdóttir, Greta B Moros, Matthias Andrews, John T Jennings, Anne E |
author_sort |
Kristjánsdóttir, Greta B |
title |
Holocene Mg/Ca, alkenones, and light stable isotope measurements on the outer North Iceland shelf, sediment core MD99-2269 |
title_short |
Holocene Mg/Ca, alkenones, and light stable isotope measurements on the outer North Iceland shelf, sediment core MD99-2269 |
title_full |
Holocene Mg/Ca, alkenones, and light stable isotope measurements on the outer North Iceland shelf, sediment core MD99-2269 |
title_fullStr |
Holocene Mg/Ca, alkenones, and light stable isotope measurements on the outer North Iceland shelf, sediment core MD99-2269 |
title_full_unstemmed |
Holocene Mg/Ca, alkenones, and light stable isotope measurements on the outer North Iceland shelf, sediment core MD99-2269 |
title_sort |
holocene mg/ca, alkenones, and light stable isotope measurements on the outer north iceland shelf, sediment core md99-2269 |
publisher |
PANGAEA |
publishDate |
2015 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.847657 https://doi.org/10.1594/PANGAEA.847657 |
op_coverage |
LATITUDE: 66.641333 * LONGITUDE: -20.863167 * DATE/TIME START: 1999-08-01T00:00:00 * DATE/TIME END: 1999-08-01T00:00:00 |
long_lat |
ENVELOPE(-20.863167,-20.863167,66.641333,66.641333) |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Foraminifera* Iceland |
genre_facet |
Arctic Foraminifera* Iceland |
op_source |
Supplement to: Kristjánsdóttir, Greta B; Moros, Matthias; Andrews, John T; Jennings, Anne E (2016): Holocene Mg/Ca, alkenones, and light stable isotope measurements on the outer North Iceland shelf (MD99-2269): A comparison of proxy data. The Holocene, 27(1), 52-62, https://doi.org/10.1177/0959683616652703 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.847657 https://doi.org/10.1594/PANGAEA.847657 |
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.847657 https://doi.org/10.1177/0959683616652703 |
_version_ |
1766343118198669312 |