Atlantic 231Pa/230Th and biogenic opal compilation of the Holocene and the LGM
The strength and geometry of the Atlantic meridional overturning circulation is tightly coupled to climate on glacial-interglacial and millennial timescales, but has proved difficult to reconstruct, particularly for the Last Glacial Maximum. Today, the return flow from the northern North Atlantic to...
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Format: | Dataset |
Language: | English |
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PANGAEA
2012
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.788550 https://doi.org/10.1594/PANGAEA.788550 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.788550 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
162-983A 172-1055C 172-1056A 172-1058A 172-1063B 172-1063D 177-1089A 177-1089B 293 38GGC 55GGC 58GGC 71GGC 82GGC Accumulation rate opal error relative AGE Agulhas Ridge Amazon Fan ANT-XI/2 Argentine Basin Atlantic Caribbean Margin Atlantic Ocean Azores Blake-Bahama Outer Ridge North Atlantic Ocean Blake Outer Ridge Brazil Basin C1_PC-ENG111 C2_PC-21210009 CALYPSO Calypso Corer Carolina Slope CEPAG DAPC2 Depth bottom/max sediment/rock top/min DRILL Drilling/drill rig DSDP/ODP/IODP sample designation |
spellingShingle |
162-983A 172-1055C 172-1056A 172-1058A 172-1063B 172-1063D 177-1089A 177-1089B 293 38GGC 55GGC 58GGC 71GGC 82GGC Accumulation rate opal error relative AGE Agulhas Ridge Amazon Fan ANT-XI/2 Argentine Basin Atlantic Caribbean Margin Atlantic Ocean Azores Blake-Bahama Outer Ridge North Atlantic Ocean Blake Outer Ridge Brazil Basin C1_PC-ENG111 C2_PC-21210009 CALYPSO Calypso Corer Carolina Slope CEPAG DAPC2 Depth bottom/max sediment/rock top/min DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Lippold, Jörg Luo, Yiming Francois, Roger Allen, Susan E Gherardi, Jeanne-Marie Pichat, Sylvain Hickey, Ben M Schulz, Hartmut Atlantic 231Pa/230Th and biogenic opal compilation of the Holocene and the LGM |
topic_facet |
162-983A 172-1055C 172-1056A 172-1058A 172-1063B 172-1063D 177-1089A 177-1089B 293 38GGC 55GGC 58GGC 71GGC 82GGC Accumulation rate opal error relative AGE Agulhas Ridge Amazon Fan ANT-XI/2 Argentine Basin Atlantic Caribbean Margin Atlantic Ocean Azores Blake-Bahama Outer Ridge North Atlantic Ocean Blake Outer Ridge Brazil Basin C1_PC-ENG111 C2_PC-21210009 CALYPSO Calypso Corer Carolina Slope CEPAG DAPC2 Depth bottom/max sediment/rock top/min DRILL Drilling/drill rig DSDP/ODP/IODP sample designation |
description |
The strength and geometry of the Atlantic meridional overturning circulation is tightly coupled to climate on glacial-interglacial and millennial timescales, but has proved difficult to reconstruct, particularly for the Last Glacial Maximum. Today, the return flow from the northern North Atlantic to lower latitudes associated with the Atlantic meridional overturning circulation reaches down to approximately 4,000 m. In contrast, during the Last Glacial Maximum this return flow is thought to have occurred primarily at shallower depths. Measurements of sedimentary 231Pa/230Th have been used to reconstruct the strength of circulation in the North Atlantic Ocean, but the effects of biogenic silica on 231Pa/230Th-based estimates remain controversial. Here we use measurements of 231Pa/230Th ratios and biogenic silica in Holocene-aged Atlantic sediments and simulations with a two-dimensional scavenging model to demonstrate that the geometry and strength of the Atlantic meridional overturning circulation are the primary controls of 231Pa/230Th ratios in modern Atlantic sediments. For the glacial maximum, a simulation of Atlantic overturning with a shallow, but vigorous circulation and bulk water transport at around 2,000 m depth best matched observed glacial Atlantic 231Pa/230Th values. We estimate that the transport of intermediate water during the Last Glacial Maximum was at least as strong as deep water transport today. |
format |
Dataset |
author |
Lippold, Jörg Luo, Yiming Francois, Roger Allen, Susan E Gherardi, Jeanne-Marie Pichat, Sylvain Hickey, Ben M Schulz, Hartmut |
author_facet |
Lippold, Jörg Luo, Yiming Francois, Roger Allen, Susan E Gherardi, Jeanne-Marie Pichat, Sylvain Hickey, Ben M Schulz, Hartmut |
author_sort |
Lippold, Jörg |
title |
Atlantic 231Pa/230Th and biogenic opal compilation of the Holocene and the LGM |
title_short |
Atlantic 231Pa/230Th and biogenic opal compilation of the Holocene and the LGM |
title_full |
Atlantic 231Pa/230Th and biogenic opal compilation of the Holocene and the LGM |
title_fullStr |
Atlantic 231Pa/230Th and biogenic opal compilation of the Holocene and the LGM |
title_full_unstemmed |
Atlantic 231Pa/230Th and biogenic opal compilation of the Holocene and the LGM |
title_sort |
atlantic 231pa/230th and biogenic opal compilation of the holocene and the lgm |
publisher |
PANGAEA |
publishDate |
2012 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.788550 https://doi.org/10.1594/PANGAEA.788550 |
op_coverage |
MEDIAN LATITUDE: 10.149037 * MEDIAN LONGITUDE: -31.158027 * SOUTH-BOUND LATITUDE: -53.300000 * WEST-BOUND LONGITUDE: -76.330020 * NORTH-BOUND LATITUDE: 60.582167 * EAST-BOUND LONGITUDE: 25.500000 * DATE/TIME START: 1966-05-17T00:00:00 * DATE/TIME END: 2005-06-15T13:51:00 * MINIMUM DEPTH, sediment/rock: 0.0000 m * MAXIMUM DEPTH, sediment/rock: 8.7050 m |
long_lat |
ENVELOPE(-76.330020,25.500000,60.582167,-53.300000) |
geographic |
Argentine |
geographic_facet |
Argentine |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Lippold, Jörg; Luo, Yiming; Francois, Roger; Allen, Susan E; Gherardi, Jeanne-Marie; Pichat, Sylvain; Hickey, Ben M; Schulz, Hartmut (2012): Strength and geometry of the glacial Atlantic Meridional Overturning Circulation. Nature Geoscience, 5, 813-816, https://doi.org/10.1038/ngeo1608 |
op_relation |
Anderson, Robert F; Ali, S; Bradtmiller, Louisa I; Nielsen, Simon Harder Holm; Fleisher, Martin Q; Burckle, Lloyd H (2009): Wind-driven upwelling in the Southern Ocean and the deglacial rise in atmospheric CO2. Science, 323(5920), 1443-1448, https://doi.org/10.1126/science.1167441 Bradtmiller, Louisa I; Anderson, Robert F; Fleisher, Martin Q; Burckle, Lloyd H (2007): Opal burial in the equatorial Atlantic Ocean over the last 30 ka: Implications for glacial-interglacial changes in the ocean silicon cycle. Paleoceanography, 22(4), PA4216, https://doi.org/10.1029/2007PA001443 Channell, James E T; Hodell, David A; Lehman, Benoît (1997): Relative geomagnetic paleointensity and d18O at ODP Site 983 (Gardar Drift, North Atlantic) since 350 ka. Earth and Planetary Science Letters, 153(1-2), 103-118, https://doi.org/10.1016/S0012-821X(97)00164-7 Chapman, Mark R; Shackleton, Nicholas J; Duplessy, Jean-Claude (2000): Sea surface temperature variability during the last glacial-interglacial cycle: assessing the magnitude and pattern of climate change in the North Atlantic. Palaeogeography, Palaeoclimatology, Palaeoecology, 157(1-2), 1-25, https://doi.org/10.1016/S0031-0182(99)00168-6 Christl, Marcus; Lippold, Jörg; Hofmann, Alexander; Wacker, Lukas; Lahaye, Yann; Synal, Hans-Arno (2010): 231Pa/230Th: A proxy for upwelling off the coast of West Africa. Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, 268(7-8), 1159-1162, https://doi.org/10.1016/j.nimb.2009.10.123 Francois, Roger; Bacon, Michael P; Suman, Daniel O (1990): Thorium 230 profiling in deep-sea sediments: high resolution records of flux and dissolution of carbonate in the equatorial Atlantic during the last 24,000 years. Paleoceanography, 5(5), 761-787, https://doi.org/10.1029/PA005i005p00761 Gherardi, Jeanne-Marie; Labeyrie, Laurent D; McManus, Jerry F; Francois, Roger; Skinner, Luke C; Cortijo, Elsa (2005): Evidence from the Northeastern Atlantic basin for variability in the rate of the meridional overturning circulation through the last deglaciation. Earth and Planetary Science Letters, 240(3-4), 710-723, https://doi.org/10.1016/j.epsl.2005.09.061 Gherardi, Jeanne-Marie; Labeyrie, Laurent D; Nave, Silvia Osorio; Francois, Roger; McManus, Jerry F; Cortijo, Elsa (2009): Glacial-interglacial circulation changes inferred from 231Pa/230Th sedimentary record in the North Atlantic region. Paleoceanography, 24(2), PA2204, https://doi.org/10.1029/2008PA001696 Grousset, Francis E; Labeyrie, Laurent D; Sinko, J A; Cremer, Michel; Bond, Gerard C; Duprat, Josette M; Cortijo, Elsa; Huon, Sylvain (1993): Patterns of ice-rafted detritus in the glacial North Atlantic. Paleoceanography, 8(2), 175-192, https://doi.org/10.1029/92PA02923 Gruetzner, Jens; Giosan, Liviu; Franz, Sven-Oliver; Tiedemann, Ralf; Cortijo, Elsa; Chaisson, William P; Flood, Roger D; Hagen, Sveinung; Keigwin, Lloyd D; Poli, Maria-Serena; Rio, Domenico; Williams, Trevor J (2002): Astronomical age models for Pleistocene drift sediments from the western North Atlantic (ODP Sites 1055-1063). Marine Geology, 189(1-2), 5-23, https://doi.org/10.1016/S0025-3227(02)00320-1 Gutjahr, Marcus; Frank, Martin; Stirling, C H; Keigwin, Lloyd D; Halliday, Alex N (2008): Tracing the Nd isotope evolution of North Atlantic Deep and Intermediate Waters in the western North Atlantic since the Last Glacial Maximum from Blake Ridge sediments. Earth and Planetary Science Letters, 266(1-2), 61-77, https://doi.org/10.1016/j.epsl.2007.10.037 Hall, Ian R; Moran, S Bradley; Zahn, Rainer; Knutz, Paul Cornils; Shen, Chuan Chou; Edwards, R Lawrence (2006): Accelerated drawdown of meridional overturning in the late-glacial Atlantic triggered by transient pre-H event freshwater perturbation. Geophysical Research Letters, 33, L16616, https://doi.org/10.1029/2006GL026239 Heil, Gerrit M N (2006): Abrupt Climate Shifts in the Western Tropical to Subtropical Atlantic Region during the Last Glacial. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 250, 121 pp, urn:nbn:de:gbv:46-diss000103939 Heinrich, Hartmut (1988): Origin and consequences of cyclic ice rafting in the Northeast Atlantic Ocean during the past 130,000 years. Quaternary Research, 29(2), 142-152, https://doi.org/10.1016/0033-5894(88)90057-9 Labeyrie, Laurent D; Labracherie, Monique; Gorfti, N; Pichon, Jean-Jacques; Vautravers, Maryline J; Arnold, Maurice; Duplessy, Jean-Claude; Paterne, Martine; Michel, Elisabeth; Duprat, Josette M; Caralp, M; Turon, Jean-Louis (1996): Hydrographic changes of the Southern Ocean (southeast Indian sector) over the last 230 kyr. Paleoceanography, 11(1), 57-76, https://doi.org/10.1029/95PA02255 Lehman, Benoît; Laj, Carlo E; Kissel, Catherine; Mazaud, Alain; Paterne, Martine; Labeyrie, Laurent D (1996): Relative changes of the geomagnetic field intensity during the last 280 kyear from piston cores in the Acores area. Physics of The Earth and Planetary Interiors, 93(3-4), 269-284, https://doi.org/10.1016/0031-9201(95)03070-0 Lippold, Jörg; Gherardi, Jeanne-Marie; Luo, Yiming (2011): Testing the 231Pa/230Th paleocirculation proxy: A data versus 2D model comparison. Geophysical Research Letters, 38, L20603, https://doi.org/10.1029/2011GL049282 Lippold, Jörg; Gruetzner, Jens; Winter, Diane M; Lahaye, Yann; Mangini, Augusto; Christl, Marcus (2009): Does sedimentary 231Pa/230Th from the Bermuda Rise monitor past Atlantic Meridional Overtuning Circulation? Geophysical Research Letters, 36, L12601, https://doi.org/10.1029/2009GL038068 Lippold, Jörg; Mulitza, Stefan; Mollenhauer, Gesine; Weyer, Stefan; Heslop, David; Christl, Marcus (2012): Boundary scavening at the East Atlantic margin does not negate use of Pa-231/Th-230 to trace Atlantic overturning. Earth and Planetary Science Letters, 333-334, 317-331, https://doi.org/10.1016/j.epsl.2012.04.005 Negre, César; Zahn, Rainer; Thomas, Alexander L; Masqué, Pere; Henderson, Gideon M; Martínez Méndez, Gema; Hall, Ian R; Mas, José L (2010): Reversed flow of Atlantic deep water during the Last Glacial Maximum. Nature, 468(7320), 84-88, https://doi.org/10.1038/nature09508 Rühlemann, Carsten; Frank, Martin; Hale, Walter; Mangini, Augusto; Mulitza, Stefan; Müller, Peter J; Wefer, Gerold (1996): Late Quaternary productivity changes in the western equatorial Atlantic: Evidence from 230Th-normalized carbonate and organic carbon accumulation rates. Marine Geology, 135(1-4), 127-152, https://doi.org/10.1016/S0025-3227(96)00048-5 Schiebel, Ralf (2002): Planktic foraminiferal sedimentation and the marine calcite budget. Global Biogeochemical Cycles, 16(4), 1065, https://doi.org/10.1029/2001GB001459 Schlünz, Birger; Schneider, Ralph R; Müller, Peter J; Wefer, Gerold (2000): Late Quaternary organic carbon accumulation south of Barbados: influence of the Orinoco and Amazon rivers? Deep Sea Research Part I: Oceanographic Research Papers, 47(6), 1101-1124, https://doi.org/10.1016/S0967-0637(99)00076-X Stoner, Joseph S; Channell, James E T; Hodell, David A; Charles, Christopher D (2003): A ~580 kyr paleomagnetic record from the sub-Antarctic South Atlantic (Ocean Drilling Program Site 1089). Journal of Geophysical Research: Solid Earth, 108(B5), 2244, https://doi.org/10.1029/2001JB001390 Vidal, Laurence; Schneider, Ralph R; Marchal, Olivier; Bickert, Torsten; Stocker, Thomas F; Wefer, Gerold (1999): Link between the North and South Atlantic during the Heinrich events of the last galcial period. Climate Dynamics, 15(12), 909-919, https://doi.org/10.1007/s003820050321 Vogelsang, Elke; Sarnthein, Michael; Pflaumann, Uwe (2001): d18O Stratigraphy, chronology, and sea surface temperatures of Atlantic sediment records (GLAMAP-2000 Kiel). Berichte-Reports, Institut für Geowissenschaften, Universität Kiel, 13, 13+244 pp., https://doi.org/10.2312/reports-ifg.2001.13 https://doi.pangaea.de/10.1594/PANGAEA.788550 https://doi.org/10.1594/PANGAEA.788550 |
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.78855010.1038/ngeo160810.1126/science.116744110.1029/2007PA00144310.1016/S0012-821X(97)00164-710.1016/S0031-0182(99)00168-610.1029/PA005i005p0076110.1016/j.epsl.2005.09.06110.1029/2008PA00169610.1029/92PA0292310.1016/S0025- |
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1802647401138225152 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.788550 2024-06-23T07:55:01+00:00 Atlantic 231Pa/230Th and biogenic opal compilation of the Holocene and the LGM Lippold, Jörg Luo, Yiming Francois, Roger Allen, Susan E Gherardi, Jeanne-Marie Pichat, Sylvain Hickey, Ben M Schulz, Hartmut MEDIAN LATITUDE: 10.149037 * MEDIAN LONGITUDE: -31.158027 * SOUTH-BOUND LATITUDE: -53.300000 * WEST-BOUND LONGITUDE: -76.330020 * NORTH-BOUND LATITUDE: 60.582167 * EAST-BOUND LONGITUDE: 25.500000 * DATE/TIME START: 1966-05-17T00:00:00 * DATE/TIME END: 2005-06-15T13:51:00 * MINIMUM DEPTH, sediment/rock: 0.0000 m * MAXIMUM DEPTH, sediment/rock: 8.7050 m 2012 text/tab-separated-values, 1444 data points https://doi.pangaea.de/10.1594/PANGAEA.788550 https://doi.org/10.1594/PANGAEA.788550 en eng PANGAEA Anderson, Robert F; Ali, S; Bradtmiller, Louisa I; Nielsen, Simon Harder Holm; Fleisher, Martin Q; Burckle, Lloyd H (2009): Wind-driven upwelling in the Southern Ocean and the deglacial rise in atmospheric CO2. Science, 323(5920), 1443-1448, https://doi.org/10.1126/science.1167441 Bradtmiller, Louisa I; Anderson, Robert F; Fleisher, Martin Q; Burckle, Lloyd H (2007): Opal burial in the equatorial Atlantic Ocean over the last 30 ka: Implications for glacial-interglacial changes in the ocean silicon cycle. Paleoceanography, 22(4), PA4216, https://doi.org/10.1029/2007PA001443 Channell, James E T; Hodell, David A; Lehman, Benoît (1997): Relative geomagnetic paleointensity and d18O at ODP Site 983 (Gardar Drift, North Atlantic) since 350 ka. Earth and Planetary Science Letters, 153(1-2), 103-118, https://doi.org/10.1016/S0012-821X(97)00164-7 Chapman, Mark R; Shackleton, Nicholas J; Duplessy, Jean-Claude (2000): Sea surface temperature variability during the last glacial-interglacial cycle: assessing the magnitude and pattern of climate change in the North Atlantic. Palaeogeography, Palaeoclimatology, Palaeoecology, 157(1-2), 1-25, https://doi.org/10.1016/S0031-0182(99)00168-6 Christl, Marcus; Lippold, Jörg; Hofmann, Alexander; Wacker, Lukas; Lahaye, Yann; Synal, Hans-Arno (2010): 231Pa/230Th: A proxy for upwelling off the coast of West Africa. Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, 268(7-8), 1159-1162, https://doi.org/10.1016/j.nimb.2009.10.123 Francois, Roger; Bacon, Michael P; Suman, Daniel O (1990): Thorium 230 profiling in deep-sea sediments: high resolution records of flux and dissolution of carbonate in the equatorial Atlantic during the last 24,000 years. Paleoceanography, 5(5), 761-787, https://doi.org/10.1029/PA005i005p00761 Gherardi, Jeanne-Marie; Labeyrie, Laurent D; McManus, Jerry F; Francois, Roger; Skinner, Luke C; Cortijo, Elsa (2005): Evidence from the Northeastern Atlantic basin for variability in the rate of the meridional overturning circulation through the last deglaciation. Earth and Planetary Science Letters, 240(3-4), 710-723, https://doi.org/10.1016/j.epsl.2005.09.061 Gherardi, Jeanne-Marie; Labeyrie, Laurent D; Nave, Silvia Osorio; Francois, Roger; McManus, Jerry F; Cortijo, Elsa (2009): Glacial-interglacial circulation changes inferred from 231Pa/230Th sedimentary record in the North Atlantic region. Paleoceanography, 24(2), PA2204, https://doi.org/10.1029/2008PA001696 Grousset, Francis E; Labeyrie, Laurent D; Sinko, J A; Cremer, Michel; Bond, Gerard C; Duprat, Josette M; Cortijo, Elsa; Huon, Sylvain (1993): Patterns of ice-rafted detritus in the glacial North Atlantic. Paleoceanography, 8(2), 175-192, https://doi.org/10.1029/92PA02923 Gruetzner, Jens; Giosan, Liviu; Franz, Sven-Oliver; Tiedemann, Ralf; Cortijo, Elsa; Chaisson, William P; Flood, Roger D; Hagen, Sveinung; Keigwin, Lloyd D; Poli, Maria-Serena; Rio, Domenico; Williams, Trevor J (2002): Astronomical age models for Pleistocene drift sediments from the western North Atlantic (ODP Sites 1055-1063). Marine Geology, 189(1-2), 5-23, https://doi.org/10.1016/S0025-3227(02)00320-1 Gutjahr, Marcus; Frank, Martin; Stirling, C H; Keigwin, Lloyd D; Halliday, Alex N (2008): Tracing the Nd isotope evolution of North Atlantic Deep and Intermediate Waters in the western North Atlantic since the Last Glacial Maximum from Blake Ridge sediments. Earth and Planetary Science Letters, 266(1-2), 61-77, https://doi.org/10.1016/j.epsl.2007.10.037 Hall, Ian R; Moran, S Bradley; Zahn, Rainer; Knutz, Paul Cornils; Shen, Chuan Chou; Edwards, R Lawrence (2006): Accelerated drawdown of meridional overturning in the late-glacial Atlantic triggered by transient pre-H event freshwater perturbation. Geophysical Research Letters, 33, L16616, https://doi.org/10.1029/2006GL026239 Heil, Gerrit M N (2006): Abrupt Climate Shifts in the Western Tropical to Subtropical Atlantic Region during the Last Glacial. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 250, 121 pp, urn:nbn:de:gbv:46-diss000103939 Heinrich, Hartmut (1988): Origin and consequences of cyclic ice rafting in the Northeast Atlantic Ocean during the past 130,000 years. Quaternary Research, 29(2), 142-152, https://doi.org/10.1016/0033-5894(88)90057-9 Labeyrie, Laurent D; Labracherie, Monique; Gorfti, N; Pichon, Jean-Jacques; Vautravers, Maryline J; Arnold, Maurice; Duplessy, Jean-Claude; Paterne, Martine; Michel, Elisabeth; Duprat, Josette M; Caralp, M; Turon, Jean-Louis (1996): Hydrographic changes of the Southern Ocean (southeast Indian sector) over the last 230 kyr. Paleoceanography, 11(1), 57-76, https://doi.org/10.1029/95PA02255 Lehman, Benoît; Laj, Carlo E; Kissel, Catherine; Mazaud, Alain; Paterne, Martine; Labeyrie, Laurent D (1996): Relative changes of the geomagnetic field intensity during the last 280 kyear from piston cores in the Acores area. Physics of The Earth and Planetary Interiors, 93(3-4), 269-284, https://doi.org/10.1016/0031-9201(95)03070-0 Lippold, Jörg; Gherardi, Jeanne-Marie; Luo, Yiming (2011): Testing the 231Pa/230Th paleocirculation proxy: A data versus 2D model comparison. Geophysical Research Letters, 38, L20603, https://doi.org/10.1029/2011GL049282 Lippold, Jörg; Gruetzner, Jens; Winter, Diane M; Lahaye, Yann; Mangini, Augusto; Christl, Marcus (2009): Does sedimentary 231Pa/230Th from the Bermuda Rise monitor past Atlantic Meridional Overtuning Circulation? Geophysical Research Letters, 36, L12601, https://doi.org/10.1029/2009GL038068 Lippold, Jörg; Mulitza, Stefan; Mollenhauer, Gesine; Weyer, Stefan; Heslop, David; Christl, Marcus (2012): Boundary scavening at the East Atlantic margin does not negate use of Pa-231/Th-230 to trace Atlantic overturning. Earth and Planetary Science Letters, 333-334, 317-331, https://doi.org/10.1016/j.epsl.2012.04.005 Negre, César; Zahn, Rainer; Thomas, Alexander L; Masqué, Pere; Henderson, Gideon M; Martínez Méndez, Gema; Hall, Ian R; Mas, José L (2010): Reversed flow of Atlantic deep water during the Last Glacial Maximum. Nature, 468(7320), 84-88, https://doi.org/10.1038/nature09508 Rühlemann, Carsten; Frank, Martin; Hale, Walter; Mangini, Augusto; Mulitza, Stefan; Müller, Peter J; Wefer, Gerold (1996): Late Quaternary productivity changes in the western equatorial Atlantic: Evidence from 230Th-normalized carbonate and organic carbon accumulation rates. Marine Geology, 135(1-4), 127-152, https://doi.org/10.1016/S0025-3227(96)00048-5 Schiebel, Ralf (2002): Planktic foraminiferal sedimentation and the marine calcite budget. Global Biogeochemical Cycles, 16(4), 1065, https://doi.org/10.1029/2001GB001459 Schlünz, Birger; Schneider, Ralph R; Müller, Peter J; Wefer, Gerold (2000): Late Quaternary organic carbon accumulation south of Barbados: influence of the Orinoco and Amazon rivers? Deep Sea Research Part I: Oceanographic Research Papers, 47(6), 1101-1124, https://doi.org/10.1016/S0967-0637(99)00076-X Stoner, Joseph S; Channell, James E T; Hodell, David A; Charles, Christopher D (2003): A ~580 kyr paleomagnetic record from the sub-Antarctic South Atlantic (Ocean Drilling Program Site 1089). Journal of Geophysical Research: Solid Earth, 108(B5), 2244, https://doi.org/10.1029/2001JB001390 Vidal, Laurence; Schneider, Ralph R; Marchal, Olivier; Bickert, Torsten; Stocker, Thomas F; Wefer, Gerold (1999): Link between the North and South Atlantic during the Heinrich events of the last galcial period. Climate Dynamics, 15(12), 909-919, https://doi.org/10.1007/s003820050321 Vogelsang, Elke; Sarnthein, Michael; Pflaumann, Uwe (2001): d18O Stratigraphy, chronology, and sea surface temperatures of Atlantic sediment records (GLAMAP-2000 Kiel). Berichte-Reports, Institut für Geowissenschaften, Universität Kiel, 13, 13+244 pp., https://doi.org/10.2312/reports-ifg.2001.13 https://doi.pangaea.de/10.1594/PANGAEA.788550 https://doi.org/10.1594/PANGAEA.788550 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Lippold, Jörg; Luo, Yiming; Francois, Roger; Allen, Susan E; Gherardi, Jeanne-Marie; Pichat, Sylvain; Hickey, Ben M; Schulz, Hartmut (2012): Strength and geometry of the glacial Atlantic Meridional Overturning Circulation. Nature Geoscience, 5, 813-816, https://doi.org/10.1038/ngeo1608 162-983A 172-1055C 172-1056A 172-1058A 172-1063B 172-1063D 177-1089A 177-1089B 293 38GGC 55GGC 58GGC 71GGC 82GGC Accumulation rate opal error relative AGE Agulhas Ridge Amazon Fan ANT-XI/2 Argentine Basin Atlantic Caribbean Margin Atlantic Ocean Azores Blake-Bahama Outer Ridge North Atlantic Ocean Blake Outer Ridge Brazil Basin C1_PC-ENG111 C2_PC-21210009 CALYPSO Calypso Corer Carolina Slope CEPAG DAPC2 Depth bottom/max sediment/rock top/min DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Dataset 2012 ftpangaea https://doi.org/10.1594/PANGAEA.78855010.1038/ngeo160810.1126/science.116744110.1029/2007PA00144310.1016/S0012-821X(97)00164-710.1016/S0031-0182(99)00168-610.1029/PA005i005p0076110.1016/j.epsl.2005.09.06110.1029/2008PA00169610.1029/92PA0292310.1016/S0025- 2024-06-12T14:17:12Z The strength and geometry of the Atlantic meridional overturning circulation is tightly coupled to climate on glacial-interglacial and millennial timescales, but has proved difficult to reconstruct, particularly for the Last Glacial Maximum. Today, the return flow from the northern North Atlantic to lower latitudes associated with the Atlantic meridional overturning circulation reaches down to approximately 4,000 m. In contrast, during the Last Glacial Maximum this return flow is thought to have occurred primarily at shallower depths. Measurements of sedimentary 231Pa/230Th have been used to reconstruct the strength of circulation in the North Atlantic Ocean, but the effects of biogenic silica on 231Pa/230Th-based estimates remain controversial. Here we use measurements of 231Pa/230Th ratios and biogenic silica in Holocene-aged Atlantic sediments and simulations with a two-dimensional scavenging model to demonstrate that the geometry and strength of the Atlantic meridional overturning circulation are the primary controls of 231Pa/230Th ratios in modern Atlantic sediments. For the glacial maximum, a simulation of Atlantic overturning with a shallow, but vigorous circulation and bulk water transport at around 2,000 m depth best matched observed glacial Atlantic 231Pa/230Th values. We estimate that the transport of intermediate water during the Last Glacial Maximum was at least as strong as deep water transport today. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Argentine ENVELOPE(-76.330020,25.500000,60.582167,-53.300000) |