Export production in the Bay of Biscay as estimated from barium-barite in settling material: a comparison with new production
We present barium data for sediment traps deployed in a northeast Atlantic margin environment (Bay of Biscay). Fluxes of excess barium were measured with the objective of calculating carbon export production rates from the surface mixed layer and thus contribute to the understanding of organic carbo...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2000
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ftvliz:oai:oma.vliz.be:100752 2023-05-15T17:41:46+02:00 Export production in the Bay of Biscay as estimated from barium-barite in settling material: a comparison with new production Dehairs, F.A. Fagel, N. Antia, A.N. Peinert, R. Elskens, M. Goeyens, L. 2000 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=100752 en eng info:eu-repo/semantics/altIdentifier/wos/000085338200002 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1016/S0967-0637(99)00072-2 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=100752 info:eu-repo/semantics/restrictedAccess %3Ci%3EDeep-Sea+Res.,+Part+1,+Oceanogr.+Res.+Pap.+47%284%29%3C%2Fi%3E%3A+583-601.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1016%2FS0967-0637%2899%2900072-2%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1016%2FS0967-0637%2899%2900072-2%3C%2Fa%3E Advection Barite Barium compounds Biogenic material Biological production Particulate organic carbon Primary production Sedimentation ANE Biscay Bay info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2000 ftvliz https://doi.org/10.1016/S0967-0637(99)00072-2 2022-05-01T08:56:22Z We present barium data for sediment traps deployed in a northeast Atlantic margin environment (Bay of Biscay). Fluxes of excess barium were measured with the objective of calculating carbon export production rates from the surface mixed layer and thus contribute to the understanding of organic carbon transport in a margin environment. Therefore, it was necessary to properly understand the different processes that affected the barium fluxes in this margin environment. Seasonal variability of POC/Ba flux ratios and decrease of barium solubilisation in the trap cups with increasing depth in the water column probably indicate that the efficiency of barite formation in the organic micro-environment varies with season and that the process is relatively slow and not yet completed in the upper 600 m of water column. Thus barite presence in biogenic aggregates will significantly depend on water column transit time of these aggregates. Furthermore, it was observed that significant lateral input of excess-Ba can occur, probably associated with residual currents leaving the margin. This advected excess-Ba affected especially the recorded fluxes in the deeper traps (>1000 m) of the outer slope region. We have attempted to correct for this advected excess-Ba component, using Th (reported by others for the same samples) as an indicator of enhanced lateral flux and assigning a characteristic Ba/Th ratio to advected material. Using transfer functions relating excess-Ba flux with export production characteristic of margin areas, observed Ba fluxes indicate an export production between 7 and 18 g C m -2 yr -1 . Such values are 3–7 times lower than estimates based on N-nutrient uptake and nutrient mass balances, but larger and more realistic than is obtained when a transfer function characteristic of open ocean systems is applied. The discrepancy between export production estimates based on excess-Ba fluxes and nutrient uptake could be resolved if part of the carbon is exported as dissolved organic matter. Results suggest that margin systems function differently from open ocean systems, and therefore Ba-proxy rationales developed for open ocean sites might not be applicable in margin areas. Article in Journal/Newspaper Northeast Atlantic Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Deep Sea Research Part I: Oceanographic Research Papers 47 4 583 601 |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
topic |
Advection Barite Barium compounds Biogenic material Biological production Particulate organic carbon Primary production Sedimentation ANE Biscay Bay |
spellingShingle |
Advection Barite Barium compounds Biogenic material Biological production Particulate organic carbon Primary production Sedimentation ANE Biscay Bay Dehairs, F.A. Fagel, N. Antia, A.N. Peinert, R. Elskens, M. Goeyens, L. Export production in the Bay of Biscay as estimated from barium-barite in settling material: a comparison with new production |
topic_facet |
Advection Barite Barium compounds Biogenic material Biological production Particulate organic carbon Primary production Sedimentation ANE Biscay Bay |
description |
We present barium data for sediment traps deployed in a northeast Atlantic margin environment (Bay of Biscay). Fluxes of excess barium were measured with the objective of calculating carbon export production rates from the surface mixed layer and thus contribute to the understanding of organic carbon transport in a margin environment. Therefore, it was necessary to properly understand the different processes that affected the barium fluxes in this margin environment. Seasonal variability of POC/Ba flux ratios and decrease of barium solubilisation in the trap cups with increasing depth in the water column probably indicate that the efficiency of barite formation in the organic micro-environment varies with season and that the process is relatively slow and not yet completed in the upper 600 m of water column. Thus barite presence in biogenic aggregates will significantly depend on water column transit time of these aggregates. Furthermore, it was observed that significant lateral input of excess-Ba can occur, probably associated with residual currents leaving the margin. This advected excess-Ba affected especially the recorded fluxes in the deeper traps (>1000 m) of the outer slope region. We have attempted to correct for this advected excess-Ba component, using Th (reported by others for the same samples) as an indicator of enhanced lateral flux and assigning a characteristic Ba/Th ratio to advected material. Using transfer functions relating excess-Ba flux with export production characteristic of margin areas, observed Ba fluxes indicate an export production between 7 and 18 g C m -2 yr -1 . Such values are 3–7 times lower than estimates based on N-nutrient uptake and nutrient mass balances, but larger and more realistic than is obtained when a transfer function characteristic of open ocean systems is applied. The discrepancy between export production estimates based on excess-Ba fluxes and nutrient uptake could be resolved if part of the carbon is exported as dissolved organic matter. Results suggest that margin systems function differently from open ocean systems, and therefore Ba-proxy rationales developed for open ocean sites might not be applicable in margin areas. |
format |
Article in Journal/Newspaper |
author |
Dehairs, F.A. Fagel, N. Antia, A.N. Peinert, R. Elskens, M. Goeyens, L. |
author_facet |
Dehairs, F.A. Fagel, N. Antia, A.N. Peinert, R. Elskens, M. Goeyens, L. |
author_sort |
Dehairs, F.A. |
title |
Export production in the Bay of Biscay as estimated from barium-barite in settling material: a comparison with new production |
title_short |
Export production in the Bay of Biscay as estimated from barium-barite in settling material: a comparison with new production |
title_full |
Export production in the Bay of Biscay as estimated from barium-barite in settling material: a comparison with new production |
title_fullStr |
Export production in the Bay of Biscay as estimated from barium-barite in settling material: a comparison with new production |
title_full_unstemmed |
Export production in the Bay of Biscay as estimated from barium-barite in settling material: a comparison with new production |
title_sort |
export production in the bay of biscay as estimated from barium-barite in settling material: a comparison with new production |
publishDate |
2000 |
url |
http://www.vliz.be/nl/open-marien-archief?module=ref&refid=100752 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
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op_relation |
info:eu-repo/semantics/altIdentifier/wos/000085338200002 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1016/S0967-0637(99)00072-2 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=100752 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/S0967-0637(99)00072-2 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
47 |
container_issue |
4 |
container_start_page |
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op_container_end_page |
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