On the 14 C and 39 Ar Distribution in the Central Arctic Ocean: Implications for Deep Water Formation
We present ΔA 14 C and 39 Ar data collected in the Nansen, Amundsen and Makarov basins during two expeditions to the central Arctic Ocean (RV Polarstern cruises ARK IV/3, 1987 and ARK VIII/3, 1991). The data are used, together with published Δ 14 C values, to describe the distribution of Δ 14 C in a...
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Cambridge University Press (CUP)
1994
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Online Access: | http://dx.doi.org/10.1017/s003382220001451x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003382220001451X |
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crcambridgeupr:10.1017/s003382220001451x 2024-09-30T14:22:24+00:00 On the 14 C and 39 Ar Distribution in the Central Arctic Ocean: Implications for Deep Water Formation Schlosser, Peter Kromer, Bernd Östlund, Gote Ekwurzel, Brenda Bönisch, Gerhard Loosli, H. H. Purtschert, Roland 1994 http://dx.doi.org/10.1017/s003382220001451x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003382220001451X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Radiocarbon volume 36, issue 3, page 327-343 ISSN 0033-8222 1945-5755 journal-article 1994 crcambridgeupr https://doi.org/10.1017/s003382220001451x 2024-09-04T04:03:24Z We present ΔA 14 C and 39 Ar data collected in the Nansen, Amundsen and Makarov basins during two expeditions to the central Arctic Ocean (RV Polarstern cruises ARK IV/3, 1987 and ARK VIII/3, 1991). The data are used, together with published Δ 14 C values, to describe the distribution of Δ 14 C in all major basins of the Arctic Ocean (Nansen, Amundsen, Makarov and Canada Basins), as well as the 39 Ar distribution in the Nansen Basin and the deep waters of the Amundsen and Makarov Basins. From the combined Δ 14 C and 39 Ar distributions, we derive information on the mean “isolation ages” of the deep and bottom waters of the Arctic Ocean. The data point toward mean ages of the bottom waters in the Eurasian Basin (Nansen and Amundsen Basins) of ca. 250-300 yr. The deep waters of the Amundsen Basin show slightly higher 3 H concentrations than those in the Nansen Basin, indicating the addition of a higher fraction of water that has been at the sea surface during the past few decades. Correction for the bomb 14 C added to the deep waters along with bomb 3 H yields isolation ages for the bulk of the deep and bottom waters of the Amundsen Basin similar to those estimated for the Nansen Basin. This finding agrees well with the 39 Ar data. Deep and bottom waters in the Canadian Basin (Makarov and Canada Basins) are very homogeneous, with an isolation age of ca. 450 yr. Δ 14 C and 39 Ar data and a simple inverse model treating the Canadian Basin Deep Water (CBDW) as one well-mixed reservoir renewed by a mixture of Atlantic Water (29%), Eurasian Basin Deep Water (69%) and brine-enriched shelf water (2%) yield a mean residence time of CBDW of ca. 300 yr. Article in Journal/Newspaper amundsen basin Arctic Arctic Ocean Central Arctic Nansen Basin Cambridge University Press Amundsen Basin ENVELOPE(74.000,74.000,87.000,87.000) Arctic Arctic Ocean Canada Radiocarbon 36 3 327 343 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
We present ΔA 14 C and 39 Ar data collected in the Nansen, Amundsen and Makarov basins during two expeditions to the central Arctic Ocean (RV Polarstern cruises ARK IV/3, 1987 and ARK VIII/3, 1991). The data are used, together with published Δ 14 C values, to describe the distribution of Δ 14 C in all major basins of the Arctic Ocean (Nansen, Amundsen, Makarov and Canada Basins), as well as the 39 Ar distribution in the Nansen Basin and the deep waters of the Amundsen and Makarov Basins. From the combined Δ 14 C and 39 Ar distributions, we derive information on the mean “isolation ages” of the deep and bottom waters of the Arctic Ocean. The data point toward mean ages of the bottom waters in the Eurasian Basin (Nansen and Amundsen Basins) of ca. 250-300 yr. The deep waters of the Amundsen Basin show slightly higher 3 H concentrations than those in the Nansen Basin, indicating the addition of a higher fraction of water that has been at the sea surface during the past few decades. Correction for the bomb 14 C added to the deep waters along with bomb 3 H yields isolation ages for the bulk of the deep and bottom waters of the Amundsen Basin similar to those estimated for the Nansen Basin. This finding agrees well with the 39 Ar data. Deep and bottom waters in the Canadian Basin (Makarov and Canada Basins) are very homogeneous, with an isolation age of ca. 450 yr. Δ 14 C and 39 Ar data and a simple inverse model treating the Canadian Basin Deep Water (CBDW) as one well-mixed reservoir renewed by a mixture of Atlantic Water (29%), Eurasian Basin Deep Water (69%) and brine-enriched shelf water (2%) yield a mean residence time of CBDW of ca. 300 yr. |
format |
Article in Journal/Newspaper |
author |
Schlosser, Peter Kromer, Bernd Östlund, Gote Ekwurzel, Brenda Bönisch, Gerhard Loosli, H. H. Purtschert, Roland |
spellingShingle |
Schlosser, Peter Kromer, Bernd Östlund, Gote Ekwurzel, Brenda Bönisch, Gerhard Loosli, H. H. Purtschert, Roland On the 14 C and 39 Ar Distribution in the Central Arctic Ocean: Implications for Deep Water Formation |
author_facet |
Schlosser, Peter Kromer, Bernd Östlund, Gote Ekwurzel, Brenda Bönisch, Gerhard Loosli, H. H. Purtschert, Roland |
author_sort |
Schlosser, Peter |
title |
On the 14 C and 39 Ar Distribution in the Central Arctic Ocean: Implications for Deep Water Formation |
title_short |
On the 14 C and 39 Ar Distribution in the Central Arctic Ocean: Implications for Deep Water Formation |
title_full |
On the 14 C and 39 Ar Distribution in the Central Arctic Ocean: Implications for Deep Water Formation |
title_fullStr |
On the 14 C and 39 Ar Distribution in the Central Arctic Ocean: Implications for Deep Water Formation |
title_full_unstemmed |
On the 14 C and 39 Ar Distribution in the Central Arctic Ocean: Implications for Deep Water Formation |
title_sort |
on the 14 c and 39 ar distribution in the central arctic ocean: implications for deep water formation |
publisher |
Cambridge University Press (CUP) |
publishDate |
1994 |
url |
http://dx.doi.org/10.1017/s003382220001451x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003382220001451X |
long_lat |
ENVELOPE(74.000,74.000,87.000,87.000) |
geographic |
Amundsen Basin Arctic Arctic Ocean Canada |
geographic_facet |
Amundsen Basin Arctic Arctic Ocean Canada |
genre |
amundsen basin Arctic Arctic Ocean Central Arctic Nansen Basin |
genre_facet |
amundsen basin Arctic Arctic Ocean Central Arctic Nansen Basin |
op_source |
Radiocarbon volume 36, issue 3, page 327-343 ISSN 0033-8222 1945-5755 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s003382220001451x |
container_title |
Radiocarbon |
container_volume |
36 |
container_issue |
3 |
container_start_page |
327 |
op_container_end_page |
343 |
_version_ |
1811634023012761600 |