Comparison of carbon and opal export rates between summer and spring bloom periods in the region of the Antarctic Polar Front, SE Atlantic.
Although primary production in the Antarctic Circumpolar Current is not above the world average and carbon burial rates are low, 70% of the world's opal burial occurs in this zone and it has been suggested that blooms of large diatoms are responsible for this extraordinary situation. Here we co...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Online Access: | https://epic.awi.de/id/eprint/2698/ https://epic.awi.de/id/eprint/2698/1/Rut8888a.pdf https://doi.org/10.1016/S0967-0645(02)00114-5 https://hdl.handle.net/10013/epic.13282 https://hdl.handle.net/10013/epic.13282.d001 |
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ftawi:oai:epic.awi.de:2698 2023-09-05T13:13:44+02:00 Comparison of carbon and opal export rates between summer and spring bloom periods in the region of the Antarctic Polar Front, SE Atlantic. Rutgers v. d. Loeff, Michiel Buesseler, K. Bathmann, Ulrich Hense, I. Andrews, I. 2002 application/pdf https://epic.awi.de/id/eprint/2698/ https://epic.awi.de/id/eprint/2698/1/Rut8888a.pdf https://doi.org/10.1016/S0967-0645(02)00114-5 https://hdl.handle.net/10013/epic.13282 https://hdl.handle.net/10013/epic.13282.d001 unknown https://epic.awi.de/id/eprint/2698/1/Rut8888a.pdf https://hdl.handle.net/10013/epic.13282.d001 Rutgers v. d. Loeff, M. orcid:0000-0003-1393-3742 , Buesseler, K. , Bathmann, U. , Hense, I. and Andrews, I. (2002) Comparison of carbon and opal export rates between summer and spring bloom periods in the region of the Antarctic Polar Front, SE Atlantic. , Deep-Sea Research II, 49 (18), pp. 3849-3869 . doi:10.1016/S0967-0645(02)00114-5 <https://doi.org/10.1016/S0967-0645%2802%2900114-5> , hdl:10013/epic.13282 EPIC3Deep-Sea Research II, 49(18), pp. 3849-3869 Article isiRev 2002 ftawi https://doi.org/10.1016/S0967-0645(02)00114-5 2023-08-22T19:43:30Z Although primary production in the Antarctic Circumpolar Current is not above the world average and carbon burial rates are low, 70% of the world's opal burial occurs in this zone and it has been suggested that blooms of large diatoms are responsible for this extraordinary situation. Here we compare export fluxes during bloom and steady-state situations near the Antarctic Polar Front in the SE Atlantic.In a previous expedition during the austral spring, we observed the development of a bloom that led to the sudden export of particles (Rutgers van der Loeff et al., 1997). Here we report the results of a second expedition to the same area in summer (Dec-Jan), 3 years later. 234Th was monitored in the surface water and in Rosette casts down to a water depth of 500m as tracer of export production in an intensive sampling program within a box of 275 x 375 km.The distribution of particulate and dissolved 234Th was remarkably constant over time and location. Total (dissolved + particulate) 234Th activities were depleted relative to its parent 238U at the surface (234Th/238U activity ratio approximately 83%), reaching equilibrium at a depth of around 190m. This constant depletion corresponds to a 234Th export rate of 1115 dpm m-2 d-1, 35% of the value observed during the spring bloom. Article in Journal/Newspaper Antarc* Antarctic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Austral The Antarctic Deep Sea Research Part II: Topical Studies in Oceanography 49 18 3849 3869 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Although primary production in the Antarctic Circumpolar Current is not above the world average and carbon burial rates are low, 70% of the world's opal burial occurs in this zone and it has been suggested that blooms of large diatoms are responsible for this extraordinary situation. Here we compare export fluxes during bloom and steady-state situations near the Antarctic Polar Front in the SE Atlantic.In a previous expedition during the austral spring, we observed the development of a bloom that led to the sudden export of particles (Rutgers van der Loeff et al., 1997). Here we report the results of a second expedition to the same area in summer (Dec-Jan), 3 years later. 234Th was monitored in the surface water and in Rosette casts down to a water depth of 500m as tracer of export production in an intensive sampling program within a box of 275 x 375 km.The distribution of particulate and dissolved 234Th was remarkably constant over time and location. Total (dissolved + particulate) 234Th activities were depleted relative to its parent 238U at the surface (234Th/238U activity ratio approximately 83%), reaching equilibrium at a depth of around 190m. This constant depletion corresponds to a 234Th export rate of 1115 dpm m-2 d-1, 35% of the value observed during the spring bloom. |
format |
Article in Journal/Newspaper |
author |
Rutgers v. d. Loeff, Michiel Buesseler, K. Bathmann, Ulrich Hense, I. Andrews, I. |
spellingShingle |
Rutgers v. d. Loeff, Michiel Buesseler, K. Bathmann, Ulrich Hense, I. Andrews, I. Comparison of carbon and opal export rates between summer and spring bloom periods in the region of the Antarctic Polar Front, SE Atlantic. |
author_facet |
Rutgers v. d. Loeff, Michiel Buesseler, K. Bathmann, Ulrich Hense, I. Andrews, I. |
author_sort |
Rutgers v. d. Loeff, Michiel |
title |
Comparison of carbon and opal export rates between summer and spring bloom periods in the region of the Antarctic Polar Front, SE Atlantic. |
title_short |
Comparison of carbon and opal export rates between summer and spring bloom periods in the region of the Antarctic Polar Front, SE Atlantic. |
title_full |
Comparison of carbon and opal export rates between summer and spring bloom periods in the region of the Antarctic Polar Front, SE Atlantic. |
title_fullStr |
Comparison of carbon and opal export rates between summer and spring bloom periods in the region of the Antarctic Polar Front, SE Atlantic. |
title_full_unstemmed |
Comparison of carbon and opal export rates between summer and spring bloom periods in the region of the Antarctic Polar Front, SE Atlantic. |
title_sort |
comparison of carbon and opal export rates between summer and spring bloom periods in the region of the antarctic polar front, se atlantic. |
publishDate |
2002 |
url |
https://epic.awi.de/id/eprint/2698/ https://epic.awi.de/id/eprint/2698/1/Rut8888a.pdf https://doi.org/10.1016/S0967-0645(02)00114-5 https://hdl.handle.net/10013/epic.13282 https://hdl.handle.net/10013/epic.13282.d001 |
geographic |
Antarctic Austral The Antarctic |
geographic_facet |
Antarctic Austral The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
EPIC3Deep-Sea Research II, 49(18), pp. 3849-3869 |
op_relation |
https://epic.awi.de/id/eprint/2698/1/Rut8888a.pdf https://hdl.handle.net/10013/epic.13282.d001 Rutgers v. d. Loeff, M. orcid:0000-0003-1393-3742 , Buesseler, K. , Bathmann, U. , Hense, I. and Andrews, I. (2002) Comparison of carbon and opal export rates between summer and spring bloom periods in the region of the Antarctic Polar Front, SE Atlantic. , Deep-Sea Research II, 49 (18), pp. 3849-3869 . doi:10.1016/S0967-0645(02)00114-5 <https://doi.org/10.1016/S0967-0645%2802%2900114-5> , hdl:10013/epic.13282 |
op_doi |
https://doi.org/10.1016/S0967-0645(02)00114-5 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
49 |
container_issue |
18 |
container_start_page |
3849 |
op_container_end_page |
3869 |
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1776204912947888128 |