American Geophysical Union (AGU)

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Paleoenvironmental implications of rock‐magnetic properties of Late Quaternary sediment cores from the eastern equatorial Atlantic
American Geophysical Union (AGU) - Tập 3 Số 1 - Trang 61-87 - 1988
Jan Bloemendal, Bonnie Lamb, John W. King
Rapid and nondestructive rock‐magnetic measurements of late Quaternary sediment cores from the Senegal continental slope and the Sierra Leone Rise in the eastern equatorial Atlantic correlate strongly with the SPECMAP oxygen isotope master curve and carbonate content. The rock‐magnetic‐paleoclimatic relationship results from differences in the concentration, accumulation rate, grain size, ...... hiện toàn bộ
Synchronous and proportional deglacial changes in Atlantic meridional overturning and northeast Brazilian precipitation
American Geophysical Union (AGU) - Tập 32 Số 6 - Trang 622-633 - 2017
Stefan Mulitza, Cristiano Mazur Chiessi, Enno Schefuß, Jörg Lippold, David Wichmann, Benny Antz, Andreas Mackensen, André Paul, Matthias Prange, Kira Rehfeld, Martin Werner, Torsten Bickert, Norbert Frank, Henning Kuhnert, Jean Lynch‐Stieglitz, Rodrigo Costa Portilho-Ramos, André Oliveira Sawakuchi, Michael Schulz, Tilmann Schwenk, Ralf Tiedemann, Maximilian Vahlenkamp, Yancheng Zhang
AbstractChanges in heat transport associated with fluctuations in the strength of the Atlantic meridional overturning circulation (AMOC) are widely considered to affect the position of the Intertropical Convergence Zone (ITCZ), but the temporal immediacy of this teleconnection has to date not been resolved. Based on a high‐resolution marine sediment sequence over t...... hiện toàn bộ
New aspects of organic carbon deposition and its paleoceanographic implications along the Northern Barents Sea Margin during the last 30,000 years
American Geophysical Union (AGU) - Tập 13 Số 4 - Trang 384-394 - 1998
Jochen Knies, Ruediger Stein
We studied variations in terrigenous (TOM) and marine organic matter (MOM) input in a sediment core on the northern Barents Sea margin over the last 30 ka. Using a multiproxy approach, we reconstructed processes controlling organic carbon deposition and investigated their paleoceanographic significance in the North Atlantic‐Arctic Gateways. Variations in paleo‐surface‐water productivity ar...... hiện toàn bộ
Late Cenozoic environments in the Barents Sea
American Geophysical Union (AGU) - Tập 3 Số 5 - Trang 601-612 - 1988
Tore O. Vorren, Morten Hald, Erland Lebesbye
We examine the paleoceanography and paleogeography of the Barents Sea during the late Cenozoic glacial regime by seismostratigraphy and core analysis. During the smaller glaciations which probably dominated the first period of the glaciogenic regime (approximately 2.5–0.8 Ma?), glaciomarine processes with sediment influx from the adjacent mainland prevailed. The Barents Sea has been covere...... hiện toàn bộ
Changes in the flow of Atlantic water into the Arctic Ocean since the last deglaciation: Evidence from the northern Svalbard continental margin, 80°N
American Geophysical Union (AGU) - Tập 20 Số 4 - 2005
Marta A. Ślubowska, Nalân Koç, Tine L. Rasmussen, Dorthe Klitgaard‐Kristensen
The Svalbard archipelago is located in the high Arctic (76°–80°N) within the northernmost reach of the West Spitsbergen Current, which is the continuation of the North Atlantic Current. In this specific setting close to the Polar Front, even small variations in the current system are expected to give large and distinct signals in paleoceanographic parameters. Thus the Svalbard area is idea...... hiện toàn bộ
Younger Dryas‐Style Cooling Events at Glacial Terminations I‐VI at ODP Site 658: Associated benthic δ13C anomalies constrain meltwater hypothesis
American Geophysical Union (AGU) - Tập 5 Số 6 - Trang 1041-1055 - 1990
Michael Sarnthein, Ralf Tiedemann
High‐resolution planktonic and epibenthic stable isotope records from Ocean Drilling Program site 658 off northwest Africa provide a basis for a detailed study of glacial terminations I‐VI during the last 650,000 years. The duration of the terminations was about one half to one quarter of an orbital precession cycle (5800–10,700 years), when its amplitude was high. At low amplitudes, the t...... hiện toàn bộ
Multidecadal variations in the Early Holocene outflow of Red Sea water into the Arabian Sea
American Geophysical Union (AGU) - Tập 16 Số 6 - Trang 658-668 - 2001
Simon Jung, G.M. Ganssen, G.R. Davies
We present Holocene stable oxygen isotope data from the deep Arabian Sea off Somalia at a decadal time resolution as a proxy for the history of intermediate/upper deep water. These data show an overall δ18O reduction by 0.5‰ between 10 and ∼6.5 kyr B.P. superimposed upon short‐term δ18O variations at a decadal‐centennial timescale. The amplitude of...... hiện toàn bộ
Southwest Monsoon Circulation and Environments of Recent Planktonic Foraminifera in the Northwestern Arabian Sea
American Geophysical Union (AGU) - Tập 7 Số 6 - Trang 799-813 - 1992
John C. Brock, Charles R. McClain, David M. Anderson, Warren L Prell, William W. Hay
Digital hydrographic data combined with satellite thermal infrared and visible band remote sensing provide a synoptic climatological view of the shallow planktonic environment. This paper uses wind, hydrographic, and ocean remote sensing data to examine southwest monsoon controls on the foraminiferal faunal composition of Recent seafloor sediments of the northwestern Arabian Sea. Ekman pum...... hiện toàn bộ
Glacial conditions in the Red Sea
American Geophysical Union (AGU) - Tập 9 Số 5 - Trang 653-660 - 1994
Eelco J. Rohling
In this paper, results from previous studies on planktonic foraminifera, δ18O, and global sea level are combined to discuss climatic conditions in the Red Sea during the last glacial maximum (18,000 B.P.). First, the influence of 120‐m sea level lowering on the exchange transport through the strait of Bab‐el‐Mandab is considered. This strait is the only natural connect...... hiện toàn bộ
Glacial/interglacial changes in the equatorial part of the Somali Basin (NW Indian Ocean) during the last 355 kyr
American Geophysical Union (AGU) - Tập 12 Số 5 - Trang 640-648 - 1997
Marie‐Thérèse Vénec‐Peyré, Jean-Pierre Caulet, C. Vergnaud Grazzini
Planktonic foraminiferal and radiolarian signatures are analyzed in the 355 kyr record of a core from the equatorial part of the Somali Basin in order to reconstruct the amplitude of oceanographic processes and to test the reproducibility of the biological response to the glacial/interglacial changes over four climatic cycles. The correspondence analysis applied to the faunal data set reve...... hiện toàn bộ
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