Radionuclides measured on water bottle samples
Actinium is one of the rarest naturally occurring elements on earth. We measured its longest-lived isotope 227Ac (half-life 21.77 yr) for the first time in the water column of the Southeast Pacific, the Central Arctic, the Antarctic Circumpolar Current (ACC) and the Weddell Gyre (WG). Besides the pr...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.761951 2024-09-15T17:38:52+00:00 Radionuclides measured on water bottle samples Geibert, Walter Rutgers van der Loeff, Michiel M Hanfland, Claudia Dauelsberg, Hans-Jürgen MEDIAN LATITUDE: -32.146903 * MEDIAN LONGITUDE: 4.480461 * SOUTH-BOUND LATITUDE: -63.176667 * WEST-BOUND LONGITUDE: -89.219000 * NORTH-BOUND LATITUDE: 87.765200 * EAST-BOUND LONGITUDE: 108.749500 * DATE/TIME START: 1991-08-25T00:00:00 * DATE/TIME END: 1999-05-07T12:19:00 2002 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.761951 https://doi.org/10.1594/PANGAEA.761951 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.761951 https://doi.org/10.1594/PANGAEA.761951 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Geibert, Walter; Rutgers van der Loeff, Michiel M; Hanfland, Claudia; Dauelsberg, Hans-Jürgen (2002): Actinium-227 as a Deep-Sea Tracer: Sources, Distribution and Applications. Earth and Planetary Science Letters, 198(1-2), 147-165, https://doi.org/10.1016/S0012-821X(02)00512-5 Amundsen Basin ANT-X/5 ANT-XI/4 ANT-XII/4 ANT-XVI/3 ARK-VIII/3 AWI_MarGeoChem AWI_Paleo Cosmonauts Sea CTD/Rosette CTD-RO In situ pump ISP JGOFS Joint Global Ocean Flux Study Marine Geochemistry @ AWI MUC MultiCorer Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS19/173 PS19 ARCTIC91 PS2176-2 PS22/836 PS22 06AQANTX_5 PS2337-2 PS2579-2 PS2600-4 PS2660-7 PS30 PS30/115 PS30/137 PS35/014 PS35 06AQANTXII_4 PS53 PS53/190-1 PS53/197-1 PS53/206-1 PS53/207-5 South Atlantic Ocean Southeast Pacific Weddell Sea dataset publication series 2002 ftpangaea https://doi.org/10.1594/PANGAEA.76195110.1016/S0012-821X(02)00512-5 2024-07-24T02:31:21Z Actinium is one of the rarest naturally occurring elements on earth. We measured its longest-lived isotope 227Ac (half-life 21.77 yr) for the first time in the water column of the Southeast Pacific, the Central Arctic, the Antarctic Circumpolar Current (ACC) and the Weddell Gyre (WG). Besides the profile in the Southeast Pacific, which confirms earlier findings about the role of diapycnal mixing for 227Ac distribution, we found three other different types of vertical profiles. These profiles point to a prominent role of advection for 227Ac distribution, especially in the Southern Ocean. Depending on the type of profile found, 227Ac is proposed as a tracer for different oceanographic questions. In the Southern Ocean, up to 4.93±0.32 dpm/m**3 227Ac is found close to the sea floor, which is the highest concentration ever observed in the ocean. Close to the sea surface in the WG, 0.46±0.05 dpm/m**3 227Acex (227Ac in excess of its progenitor 231Pa) is detected. We use 227Acex there to determine the upwelling velocity in the Eastern WG to be about 55 m/yr. In the ACC, Upper and Lower Circumpolar Deep Water (UCDW and LCDW) are found to differ clearly in their 227Acex activity. High 227Acex activities are therefore a promising tracer for recent inputs of LCDW to the sea surface, which may help to understand the role of deep upwelling for iron inputs into Antarctic surface waters. The expected release of 227Ac is compared with 228Ra to make sure that the large near-surface excess in the water column of the Southern Ocean is not due to lateral inputs by isopycnal mixing. Data from the Central Arctic and from a transect across the ACC confirm that 228Ra and 227Acex differ strongly in their sources. The first measurements of 227Ac on suspended matter (less than 1.7% of total 227Ac close to the sea floor) indicate that the particle reactivity of 227Ac is negligible in the open ocean, in agreement with earlier findings [Y. Nozaki, Nature 310 (1984) 486-488]. Despite the extremely low concentrations of 227Ac, new measurement ... Other/Unknown Material amundsen basin Antarc* Antarctic Cosmonauts sea South Atlantic Ocean Southern Ocean Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-89.219000,108.749500,87.765200,-63.176667) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Amundsen Basin ANT-X/5 ANT-XI/4 ANT-XII/4 ANT-XVI/3 ARK-VIII/3 AWI_MarGeoChem AWI_Paleo Cosmonauts Sea CTD/Rosette CTD-RO In situ pump ISP JGOFS Joint Global Ocean Flux Study Marine Geochemistry @ AWI MUC MultiCorer Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS19/173 PS19 ARCTIC91 PS2176-2 PS22/836 PS22 06AQANTX_5 PS2337-2 PS2579-2 PS2600-4 PS2660-7 PS30 PS30/115 PS30/137 PS35/014 PS35 06AQANTXII_4 PS53 PS53/190-1 PS53/197-1 PS53/206-1 PS53/207-5 South Atlantic Ocean Southeast Pacific Weddell Sea |
spellingShingle |
Amundsen Basin ANT-X/5 ANT-XI/4 ANT-XII/4 ANT-XVI/3 ARK-VIII/3 AWI_MarGeoChem AWI_Paleo Cosmonauts Sea CTD/Rosette CTD-RO In situ pump ISP JGOFS Joint Global Ocean Flux Study Marine Geochemistry @ AWI MUC MultiCorer Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS19/173 PS19 ARCTIC91 PS2176-2 PS22/836 PS22 06AQANTX_5 PS2337-2 PS2579-2 PS2600-4 PS2660-7 PS30 PS30/115 PS30/137 PS35/014 PS35 06AQANTXII_4 PS53 PS53/190-1 PS53/197-1 PS53/206-1 PS53/207-5 South Atlantic Ocean Southeast Pacific Weddell Sea Geibert, Walter Rutgers van der Loeff, Michiel M Hanfland, Claudia Dauelsberg, Hans-Jürgen Radionuclides measured on water bottle samples |
topic_facet |
Amundsen Basin ANT-X/5 ANT-XI/4 ANT-XII/4 ANT-XVI/3 ARK-VIII/3 AWI_MarGeoChem AWI_Paleo Cosmonauts Sea CTD/Rosette CTD-RO In situ pump ISP JGOFS Joint Global Ocean Flux Study Marine Geochemistry @ AWI MUC MultiCorer Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS19/173 PS19 ARCTIC91 PS2176-2 PS22/836 PS22 06AQANTX_5 PS2337-2 PS2579-2 PS2600-4 PS2660-7 PS30 PS30/115 PS30/137 PS35/014 PS35 06AQANTXII_4 PS53 PS53/190-1 PS53/197-1 PS53/206-1 PS53/207-5 South Atlantic Ocean Southeast Pacific Weddell Sea |
description |
Actinium is one of the rarest naturally occurring elements on earth. We measured its longest-lived isotope 227Ac (half-life 21.77 yr) for the first time in the water column of the Southeast Pacific, the Central Arctic, the Antarctic Circumpolar Current (ACC) and the Weddell Gyre (WG). Besides the profile in the Southeast Pacific, which confirms earlier findings about the role of diapycnal mixing for 227Ac distribution, we found three other different types of vertical profiles. These profiles point to a prominent role of advection for 227Ac distribution, especially in the Southern Ocean. Depending on the type of profile found, 227Ac is proposed as a tracer for different oceanographic questions. In the Southern Ocean, up to 4.93±0.32 dpm/m**3 227Ac is found close to the sea floor, which is the highest concentration ever observed in the ocean. Close to the sea surface in the WG, 0.46±0.05 dpm/m**3 227Acex (227Ac in excess of its progenitor 231Pa) is detected. We use 227Acex there to determine the upwelling velocity in the Eastern WG to be about 55 m/yr. In the ACC, Upper and Lower Circumpolar Deep Water (UCDW and LCDW) are found to differ clearly in their 227Acex activity. High 227Acex activities are therefore a promising tracer for recent inputs of LCDW to the sea surface, which may help to understand the role of deep upwelling for iron inputs into Antarctic surface waters. The expected release of 227Ac is compared with 228Ra to make sure that the large near-surface excess in the water column of the Southern Ocean is not due to lateral inputs by isopycnal mixing. Data from the Central Arctic and from a transect across the ACC confirm that 228Ra and 227Acex differ strongly in their sources. The first measurements of 227Ac on suspended matter (less than 1.7% of total 227Ac close to the sea floor) indicate that the particle reactivity of 227Ac is negligible in the open ocean, in agreement with earlier findings [Y. Nozaki, Nature 310 (1984) 486-488]. Despite the extremely low concentrations of 227Ac, new measurement ... |
format |
Other/Unknown Material |
author |
Geibert, Walter Rutgers van der Loeff, Michiel M Hanfland, Claudia Dauelsberg, Hans-Jürgen |
author_facet |
Geibert, Walter Rutgers van der Loeff, Michiel M Hanfland, Claudia Dauelsberg, Hans-Jürgen |
author_sort |
Geibert, Walter |
title |
Radionuclides measured on water bottle samples |
title_short |
Radionuclides measured on water bottle samples |
title_full |
Radionuclides measured on water bottle samples |
title_fullStr |
Radionuclides measured on water bottle samples |
title_full_unstemmed |
Radionuclides measured on water bottle samples |
title_sort |
radionuclides measured on water bottle samples |
publisher |
PANGAEA |
publishDate |
2002 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.761951 https://doi.org/10.1594/PANGAEA.761951 |
op_coverage |
MEDIAN LATITUDE: -32.146903 * MEDIAN LONGITUDE: 4.480461 * SOUTH-BOUND LATITUDE: -63.176667 * WEST-BOUND LONGITUDE: -89.219000 * NORTH-BOUND LATITUDE: 87.765200 * EAST-BOUND LONGITUDE: 108.749500 * DATE/TIME START: 1991-08-25T00:00:00 * DATE/TIME END: 1999-05-07T12:19:00 |
long_lat |
ENVELOPE(-89.219000,108.749500,87.765200,-63.176667) |
genre |
amundsen basin Antarc* Antarctic Cosmonauts sea South Atlantic Ocean Southern Ocean Weddell Sea |
genre_facet |
amundsen basin Antarc* Antarctic Cosmonauts sea South Atlantic Ocean Southern Ocean Weddell Sea |
op_source |
Supplement to: Geibert, Walter; Rutgers van der Loeff, Michiel M; Hanfland, Claudia; Dauelsberg, Hans-Jürgen (2002): Actinium-227 as a Deep-Sea Tracer: Sources, Distribution and Applications. Earth and Planetary Science Letters, 198(1-2), 147-165, https://doi.org/10.1016/S0012-821X(02)00512-5 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.761951 https://doi.org/10.1594/PANGAEA.761951 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.76195110.1016/S0012-821X(02)00512-5 |
_version_ |
1810475823617015808 |