Contributors: Rühlemann, Carsten, Diekmann, Bernhard, Mulitza, Stefan, Frank, Martin

Date: 2001-06-27

South Atlantic in Late Quaternary: Reconstruction of Budget and Currents...Late Quaternary changes of western equatorial Atlantic surface circulation and Amazon lowland climate recorded in Ceara Rise deep-sea sediments ... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 3.831667 * LONGITUDE: -41.621667 * DATE/TIME: 1991-05-17T00:00:00 * ELEVATION: -3292.0 m * Recovery: 6.65 m * LOCATION: Amazon Fan * CAMPAIGN: M16/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)

Contributors: Vink, Annemiek, Rühlemann, Carsten, Zonneveld, Karin A F, Mulitza, Stefan, Hüls, Matthias, Willems, Helmut

Date: 2001-03-08

Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: The age model of Hüls and Zahn (2000) dataset: doi:10.1594/PANGAEA.734151 was modified. The sample KIA4696 was rejected because of the slight reversal observed from 2.25 to 2.28 m core depth, which is most likely associated with the 14C age plateau of the Younger Dryas (Hughen et al., 1998, doi:10.1038/380051a0) Coverage: EVENT LABEL: * LATITUDE: 12.090000 * LONGITUDE: -61.243333 * DATE/TIME: 1996-04-19T00:00:00 * ELEVATION: -1299.0 m * Recovery: 9.63 m * CAMPAIGN: M35/1 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)...South Atlantic in Late Quaternary: Reconstruction of Budget and Currents ... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: The age model of Hüls and Zahn (2000) dataset: doi:10.1594/PANGAEA.734151 was modified. The sample KIA4696 was rejected because of the slight reversal observed from 2.25 to 2.28 m core depth, which is most likely associated with the 14C age plateau of the Younger Dryas (Hughen et al., 1998, doi:10.1038/380051a0) Coverage: EVENT LABEL: * LATITUDE: 12.090000 * LONGITUDE: -61.243333 * DATE/TIME: 1996-04-19T00:00:00 * ELEVATION: -1299.0 m * Recovery: 9.63 m * CAMPAIGN: M35/1 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)

Contributors: Hale, Walter, Pflaumann, Uwe

Date: 1999-02-20

Sea-surface Temperature Estimations using a Modern Analog Technique with Foraminiferal Assemblages from Western Atlantic Quaternary Sediments...Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 1.950000 * LONGITUDE: 3.551667 * DATE/TIME: 1991-12-29T00:00:00 * ELEVATION: -4162.0 m * Recovery: 7.92 m * LOCATION: Niger Sediment Fan * CAMPAIGN: M20/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)...South Atlantic in Late Quaternary: Reconstruction of Budget and Currents ... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: 1.950000 * LONGITUDE: 3.551667 * DATE/TIME: 1991-12-29T00:00:00 * ELEVATION: -4162.0 m * Recovery: 7.92 m * LOCATION: Niger Sediment Fan * CAMPAIGN: M20/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)

Contributors: Rühlemann, Carsten, Müller, Peter J, Schneider, Ralph R

Date: 1999-11-22

South Atlantic in Late Quaternary: Reconstruction of Budget and Currents ... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: -11.770500 * LONGITUDE: 11.681900 * DATE/TIME: 1988-02-25T00:00:00 * ELEVATION: -3411.0 m * Penetration: 18 m * Recovery: 12.41 m * LOCATION: Angola Basin * CAMPAIGN: M6/6 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)

Contributors: Volbers, Andrea N A, Henrich, Rüdiger

Date: 2002-03-12

Abstract: In this study, we test various parameters in deep-sea sediments (bulk sediment parameters and changes in microfossil abundances and preservation character) which are generally accepted as indicators of calcium carbonate dissolution. We investigate sediment material from station GeoB 1710-3 in the northern Cape Basin (eastern South Atlantic), 280 km away from the Namibian coast, well outside today's coastal upwelling. As northern Benguela upwelling cells were displaced westward and periodically preceded the core location during the past 245 kyr (Volbers et al., submitted), GeoB 1710-3 sediments reflect these changes in upwelling productivity. Results of the most commonly used calcium carbonate dissolution proxies do not only monitor dissolution within these calcareous sediments but also reflect changes in upwelling intensity. Accordingly, these conventional proxy parameters misrepresent, to some extent, the extent of calcium carbonate dissolution. These results were verified by an independent dissolution proxy, the Globigerina bulloides dissolution index (BDX') (Volbers and Henrich, 2002, doi:10.1016/S0025-3227(02)00333-X). The BDX' is based on scanning electronic microscope ultrastructural investigation of planktonic foraminiferal tests and indicates persistent good carbonate preservation throughout the past 245 kyr, with the exception of one pronounced dissolution event at early oxygen isotopic stage (OIS) 6. The early OIS 6 is characterized by calcium carbonate contents, sand contents, and planktonic foraminiferal concentrations all at their lowest levels for the last 245 kyr. At the same time, the ratio of radiolarian to planktonic foraminiferal abundances and the ratio of benthic to planktonic foraminiferal tests are strongly increased, as are the rain ratio, the fragmentation index, and the BDX'. The sedimentary calcite lysocline rose above the core position and GeoB 1710-3 sediments were heavily altered, as attested to by the unusual accumulation of pellets, aggregates, sponge spicules, radiolaria, benthic foraminifera, and planktonic foraminiferal assemblages. Solely the early OIS 6 dissolution event altered the coarse fraction intensely, and is therefore reflected by all conventional calcium carbonate preservation proxies and the BDX'. We attribute the more than 1000 m rise of the sedimentary calcite lysocline to the combination of two processes: (a) a prominent change in the deep-water mass distribution within the South Atlantic and (b) intense degradation of organic material within the sediment (preserved as maximum total organic carbon content) creating microenvironments favorable for calcium carbonate dissolution. Category: geoscientificInformation Source: Supplement to: Volbers, Andrea N A; Henrich, Rüdiger (2002): Late Quaternary variations in calcium carbonate preservation of deep-sea sediments in the northern Cape Basin: results from a multiproxy approach. Marine Geology, 180(1-4), 203-220, https://doi.org/10.1016/S0025-3227(01)00214-6 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: -23.431667 * LONGITUDE: 11.698333 * DATE/TIME: 1992-01-11T00:00:00 * ELEVATION: -2987.0 m * Recovery: 10.45 m * LOCATION: Namibia continental slope * CAMPAIGN: M20/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)...South Atlantic in Late Quaternary: Reconstruction of Budget and Currents...Planktic foraminifera as paleoceangraphic indicators: Production, preservation, and reconstruction of upwelling intensity. Implications from late quarternary South Atlantic sediments ... Abstract: In this study, we test various parameters in deep-sea sediments (bulk sediment parameters and changes in microfossil abundances and preservation character) which are generally accepted as indicators of calcium carbonate dissolution. We investigate sediment material from station GeoB 1710-3 in the northern Cape Basin (eastern South Atlantic), 280 km away from the Namibian coast, well outside today's coastal upwelling. As northern Benguela upwelling cells were displaced westward and periodically preceded the core location during the past 245 kyr (Volbers et al., submitted), GeoB 1710-3 sediments reflect these changes in upwelling productivity. Results of the most commonly used calcium carbonate dissolution proxies do not only monitor dissolution within these calcareous sediments but also reflect changes in upwelling intensity. Accordingly, these conventional proxy parameters misrepresent, to some extent, the extent of calcium carbonate dissolution. These results were verified by an independent dissolution proxy, the Globigerina bulloides dissolution index (BDX') (Volbers and Henrich, 2002, doi:10.1016/S0025-3227(02)00333-X). The BDX' is based on scanning electronic microscope ultrastructural investigation of planktonic foraminiferal tests and indicates persistent good carbonate preservation throughout the past 245 kyr, with the exception of one pronounced dissolution event at early oxygen isotopic stage (OIS) 6. The early OIS 6 is characterized by calcium carbonate contents, sand contents, and planktonic foraminiferal concentrations all at their lowest levels for the last 245 kyr. At the same time, the ratio of radiolarian to planktonic foraminiferal abundances and the ratio of benthic to planktonic foraminiferal tests are strongly increased, as are the rain ratio, the fragmentation index, and the BDX'. The sedimentary calcite lysocline rose above the core position and GeoB 1710-3 sediments were heavily altered, as attested to by the unusual accumulation of pellets, aggregates, sponge spicules, radiolaria, benthic foraminifera, and planktonic foraminiferal assemblages. Solely the early OIS 6 dissolution event altered the coarse fraction intensely, and is therefore reflected by all conventional calcium carbonate preservation proxies and the BDX'. We attribute the more than 1000 m rise of the sedimentary calcite lysocline to the combination of two processes: (a) a prominent change in the deep-water mass distribution within the South Atlantic and (b) intense degradation of organic material within the sediment (preserved as maximum total organic carbon content) creating microenvironments favorable for calcium carbonate dissolution. Category: geoscientificInformation Source: Supplement to: Volbers, Andrea N A; Henrich, Rüdiger (2002): Late Quaternary variations in calcium carbonate preservation of deep-sea sediments in the northern Cape Basin: results from a multiproxy approach. Marine Geology, 180(1-4), 203-220, https://doi.org/10.1016/S0025-3227(01)00214-6 Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: -23.431667 * LONGITUDE: 11.698333 * DATE/TIME: 1992-01-11T00:00:00 * ELEVATION: -2987.0 m * Recovery: 10.45 m * LOCATION: Namibia continental slope * CAMPAIGN: M20/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)

Contributors: Wolff, Tobias

Date: 2004-12-17

South Atlantic in Late Quaternary: Reconstruction of Budget and Currents...Mixed layer characteristics in the equatorial Atlantic during the late Quaternary as deduced from planktonic foraminifera...Response of the tropical Atlantic thermocline to Late Quaternary trade wind changes ... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: -1.665000 * LONGITUDE: -12.428330 * DATE/TIME: 1989-02-25T00:00:00 * ELEVATION: -3225.0 m * Penetration: 17 m * Recovery: 15.22 m * LOCATION: Equatorial Atlantic * CAMPAIGN: M9/4 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)

Contributors: von Dobeneck, Tilo, Schmieder, Frank

Date: 2004-12-15

South Atlantic in Late Quaternary: Reconstruction of Budget and Currents ... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: -30.451667 * LONGITUDE: -38.801667 * DATE/TIME: 1994-07-30T00:00:00 * ELEVATION: -3927.0 m * Recovery: 8.19 m * LOCATION: Rio Grande Rise * CAMPAIGN: M29/2 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)

Contributors: von Dobeneck, Tilo, Schmieder, Frank

Date: 2004-12-15

South Atlantic in Late Quaternary: Reconstruction of Budget and Currents ... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: -24.475000 * LONGITUDE: 7.533333 * DATE/TIME: 1990-03-20T00:00:00 * ELEVATION: -4084.0 m * Recovery: 8.61 m * LOCATION: Cape Basin * CAMPAIGN: M12/1 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)

Contributors: von Dobeneck, Tilo, Schmieder, Frank

Date: 1999-07-12

South Atlantic in Late Quaternary: Reconstruction of Budget and Currents ... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: -34.183333 * LONGITUDE: -28.635000 * DATE/TIME: 1996-03-05T00:00:00 * ELEVATION: -4340.0 m * Recovery: 7.95 m * LOCATION: Hunter Channel * CAMPAIGN: M34/3 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)

Contributors: Ruhland, Götz

Date: 2001-02-20

South Atlantic in Late Quaternary: Reconstruction of Budget and Currents ... Abstract: Not Available Category: geoscientificInformation Source: Not Available Supplemental Information: Not Availble Coverage: EVENT LABEL: * LATITUDE: -1.665000 * LONGITUDE: -12.428330 * DATE/TIME: 1989-02-25T00:00:00 * ELEVATION: -3225.0 m * Penetration: 17 m * Recovery: 15.22 m * LOCATION: Equatorial Atlantic * CAMPAIGN: M9/4 * BASIS: Meteor (1986) * DEVICE: Gravity corer (Kiel type)