Michael Sarnthein

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A detailed (ca. 100 yr resolution) and well-dated (18 AMS 14C dates to 23 cal. ka BP) record of latest Pleistocene}Holocene variations in terrigenous (eolian) sediment deposition at ODP Site 658C o! Cap Blanc, Mauritania documents very abrupt, large-scale changes in subtropical North African climate. The terrigenous record exhibits a well-de"ned period of(More)
Based on the study of 10 sediment cores and 40 core-top samples from the South China Sea (SCS) we obtained proxy records of past changes in East Asian monsoon climate on millennial to bidecadal time scales over the last 220,000 years. Climate proxies such as global sea level, estimates of paleotemperature, salinity, and nutrients in surface water,(More)
At the western continental margin of the Barents Sea, 75°N, hemipelagic sediments provide a record of Holocene climate change with a time resolution of 10–70 years. Planktic foraminifera counts reveal a very early Holocene thermal optimum 10.7–7.7 kyr BP, with summer sea surface temperatures (SST) of 8°C and a much enhanced West Spitsbergen Current. There(More)
Mapping the abundance of C in leaf-wax components in surface sediments recovered from the seafloor off northwest Africa (0–35°N) reveals a clear pattern of dC distribution, indicating systematic changes in the proportions of terrestrial C3 and C4 plant input. At 20°N latitude, we find that isotopically enriched products characteristic of C4 plants account(More)
Several high-resolution proxy environmental records have been obtained for the last 35 kyr from ODP Hole 658C, a well-studied site ca. 200 km o€ Cap Blanc, NW Africa. The collective assessment based on the marine proxies (U 0 37 SST, contents of TOC and chlorins, Upwelling Radiolarian Index and the percentage of Florisphaera profunda), surprisingly(More)
The youngest Toba eruption, ca. 74 ka, is considered to be the largest eruption of the late Pleistocene (Chesner et al., 1991), the impact of which on global climate has been discussed (Rampino, 1993; Rampino and Self, 1992; Kerr, 1996). Until now, silicic ash layers and dispersed glass shards from the eruption of the Toba caldera in northern Sumatra have(More)
A major tipping point of Earth’s history occurred during the mid-Pliocene: the onset of major Northern-Hemisphere Glaciation (NHG) and of pronounced, Quaternary-style cycles of glacial-to-interglacial climates, that contrast with more uniform climates over most of the preceding Cenozoic and continue until today (Zachos et al., 2001). The severe(More)
Deep water formation in the North Atlantic and Southern Ocean is widely thought to influence deglacial CO2 rise and climate change; here we suggest that deep water formation in the North Pacific may also play an important role. We present paired radiocarbon and boron isotope data from foraminifera from sediment core MD02-2489 at 3640m in the North East(More)
Thorsten Kiefer, Stephan Lorenz, Michael Schulz, Gerrit Lohmann, Michael Sarnthein and Henry Elderfield Institut für Geowissenschaften, Universität Kiel, Olshausenstrasse 40, 24118 Kiel, Max-Planck Institut für Meteorologie, Hamburg, Meteorologisches Institut, Universität Hamburg, Hamburg, Fachbereich Geowissenschaften, Universität Bremen, Bremen, Germany;(More)
[1] To better understand the deglacial upwelling pattern in the east Pacific, we have made radiocarbon (C) measurements on benthic foraminifera and macrofauna from a 3.5 m long interval in ODP Core 893A from Santa Barbara Basin, California, representing early deglaciation. This work serves to investigate the source of apparent disagreement between(More)