14 C in the Deep Water of the East Atlantic
The renewal of east Atlantic deep water and its large-scale circulation and mixing have been studied in observed distributions of temperature, silicate, ΣCO 2 , and 14 C. 14 C variations in northeast Atlantic deep water below 3500m depth are small. Δ 14 C values range from − 100‰ to −125‰. 14 C bott...
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Cambridge University Press (CUP)
1986
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Online Access: | http://dx.doi.org/10.1017/s0033822200007505 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200007505 |
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crcambridgeupr:10.1017/s0033822200007505 2024-03-03T08:47:18+00:00 14 C in the Deep Water of the East Atlantic Schlitzer, Reiner 1986 http://dx.doi.org/10.1017/s0033822200007505 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200007505 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Radiocarbon volume 28, issue 2A, page 391-396 ISSN 0033-8222 1945-5755 General Earth and Planetary Sciences Archeology journal-article 1986 crcambridgeupr https://doi.org/10.1017/s0033822200007505 2024-02-08T08:32:31Z The renewal of east Atlantic deep water and its large-scale circulation and mixing have been studied in observed distributions of temperature, silicate, ΣCO 2 , and 14 C. 14 C variations in northeast Atlantic deep water below 3500m depth are small. Δ 14 C values range from − 100‰ to −125‰. 14 C bottom water concentrations decrease from Δ 14 C =−117‰ in the Sierra Leone Basin to Δ 14 C = − 123‰ in the Iberian Basin and are consistent with a mean northward bottom water flow. The characteristic of the water that flows from the west Atlantic through the Romanche Trench into the east Atlantic was determined by inspection of θ /Δ 14 C and θ /SiO 2 diagrams. A mean potential temperature of θ = 1.50 ± .05°C was found for the inflowing water. A multi-box model including circulation, mixing, and chemical source terms in the deep water has been formulated. Linear programing and least-squares techniques have been used to obtain the transport and source parameters of the model from the observed tracer fields. Model calculations reveal an inflow through the Romanche Trench from the west Atlantic, which predominates over any other inflow, of (5 ± 2) Sv (potential temperature 1.50°C), a convective turnover of (150 ± 50) years and a vertical apparent diffusivity of (4 ± 1) cm 2 /s. Chemical source terms are in the expected ranges. Article in Journal/Newspaper Northeast Atlantic Cambridge University Press Radiocarbon 28 2A 391 396 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
General Earth and Planetary Sciences Archeology |
spellingShingle |
General Earth and Planetary Sciences Archeology Schlitzer, Reiner 14 C in the Deep Water of the East Atlantic |
topic_facet |
General Earth and Planetary Sciences Archeology |
description |
The renewal of east Atlantic deep water and its large-scale circulation and mixing have been studied in observed distributions of temperature, silicate, ΣCO 2 , and 14 C. 14 C variations in northeast Atlantic deep water below 3500m depth are small. Δ 14 C values range from − 100‰ to −125‰. 14 C bottom water concentrations decrease from Δ 14 C =−117‰ in the Sierra Leone Basin to Δ 14 C = − 123‰ in the Iberian Basin and are consistent with a mean northward bottom water flow. The characteristic of the water that flows from the west Atlantic through the Romanche Trench into the east Atlantic was determined by inspection of θ /Δ 14 C and θ /SiO 2 diagrams. A mean potential temperature of θ = 1.50 ± .05°C was found for the inflowing water. A multi-box model including circulation, mixing, and chemical source terms in the deep water has been formulated. Linear programing and least-squares techniques have been used to obtain the transport and source parameters of the model from the observed tracer fields. Model calculations reveal an inflow through the Romanche Trench from the west Atlantic, which predominates over any other inflow, of (5 ± 2) Sv (potential temperature 1.50°C), a convective turnover of (150 ± 50) years and a vertical apparent diffusivity of (4 ± 1) cm 2 /s. Chemical source terms are in the expected ranges. |
format |
Article in Journal/Newspaper |
author |
Schlitzer, Reiner |
author_facet |
Schlitzer, Reiner |
author_sort |
Schlitzer, Reiner |
title |
14 C in the Deep Water of the East Atlantic |
title_short |
14 C in the Deep Water of the East Atlantic |
title_full |
14 C in the Deep Water of the East Atlantic |
title_fullStr |
14 C in the Deep Water of the East Atlantic |
title_full_unstemmed |
14 C in the Deep Water of the East Atlantic |
title_sort |
14 c in the deep water of the east atlantic |
publisher |
Cambridge University Press (CUP) |
publishDate |
1986 |
url |
http://dx.doi.org/10.1017/s0033822200007505 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200007505 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Radiocarbon volume 28, issue 2A, page 391-396 ISSN 0033-8222 1945-5755 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0033822200007505 |
container_title |
Radiocarbon |
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28 |
container_issue |
2A |
container_start_page |
391 |
op_container_end_page |
396 |
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1792503477305344000 |