High-resolution, downhole, and nondestructive core measurements from Sites 999 and 1001 in the Caribbean Sea: application to the Late Paleocene Thermal Maximum

Röhl, Ursula; Abrams, Lewis J.

doi:10.2973/odp.proc.sr.165.009.2000

Cited by 86 publications

(88 citation statements)

References 22 publications

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“…The detection limit for iron for the XRF scanner used is 210 ppm (Richter et al 2006). Repeatability tests at the surface of split sediment core halves have shown that the error is smaller than 1% if the core surface is of high quality (Röhl and Abrams, 2000), which was the case for the scanned core sections of this study.…”

Section: Stable Isotope Measurements Ird and Fe Concentrationmentioning

confidence: 82%

The meridional temperature gradient in the eastern North Atlantic during MIS 11 and its link to the ocean–atmosphere system

Kandiano

Bauch

Fahl

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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Temporal and spatial patterns in eastern North Atlantic sea-surface temperatures (SST) were reconstructed for marine isotope stage (MIS) 11c using a submeridional transect of five sediment cores. The SST reconstructions are based on planktic foraminiferal abundances and alkenone indices, and are supported by benthic and planktic stable isotope measurements, as well as by ice-rafted debris content in polar and middle latitudes. Additionally, the larger-scale dynamics of the precipitation regime over northern Africa and the western Mediterranean region was evaluated from iron concentrations in marine sediments off NW Africa and planktic δ 13 C in combination with analysis of planktic foraminiferal abundances down to the species level in the Mediterranean Sea. Compared to the modern situation, it is revealed that during entire MIS 11c sensu stricto (ss), i.e., between 420 and 398 ka according to our age models, a cold SST anomaly in the Nordic seas co-existed with a warm SST anomaly in the middle latitudes and the subtropics, resulting in steeper meridional SST gradients than during the Holocene. Such a SST pattern correlates well with a prevalence of a negative mode of the modern North Atlantic Oscillation. We suggest that our scenario might partly explain the longer duration of wet conditions in the northern Africa during MIS 11c compared to the Holocene.

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Section: Stable Isotope Measurements Ird and Fe Concentrationmentioning

confidence: 82%

The meridional temperature gradient in the eastern North Atlantic during MIS 11 and its link to the ocean–atmosphere system

Kandiano

Bauch

Fahl

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…The measurements were made on the CORTEX scanner at the Bremen Integrated Ocean Drilling Program (IODP) core repository [Röhl and Abrams, 2000]. This automated scanning method allows for a rapid qualitative determination of the geochemical composition of the sediment in very high resolution [Jansen et al, 1992].…”

Section: X-ray Fluorescence Spectrometrymentioning

confidence: 99%

Coupling of millennial‐scale changes in sea surface temperature and precipitation off northeastern Brazil with high‐latitude climate shifts during the last glacial period

et al. 2007

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High‐resolution records of alkenone‐derived sea surface temperatures and elemental Ti/Ca ratios from a sediment core retrieved off northeastern Brazil (4°S) reveal short‐term climate variability throughout the past 63,000 a. Large pulses of terrigenous sediment discharge, caused by increased precipitation in the Brazilian hinterland, coincide with Heinrich events and the Younger Dryas period. Terrigenous input maxima related to Heinrich events H6–H2 are characterized by rapid cooling of surface water ranging between 0.5° and 2°C. This signature is consistent with a climate model experiment where a reduction of the Atlantic meridional overturning circulation (AMOC) and related North Atlantic cooling causes intensification of NE trade winds and a southward movement of the Intertropical Convergence Zone, resulting in enhanced precipitation off northeastern Brazil. During deglaciation the surface temperature evolution at the core site predominantly followed the Antarctic warming trend, including a cooling, prior to the Younger Dryas period. An abrupt temperature rise preceding the onset of the Bølling/Allerød transition agrees with model experiments suggesting a Southern Hemisphere origin for the abrupt resumption of the AMOC during deglaciation caused by Southern Ocean warming and associated with northward flow anomalies of the South Atlantic western boundary current.

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“…A special emphasis was placed on the upper 31 m of the sediments because it is during this time interval (~80 kyr) that previous investigations indicate a change in the controls on climate at the site (Partridge, 2002). The XRF core scanner was used to measure major elements (e.g., Al, Si, S, K, Ca, Ti, Cl, and Fe) on split sediment cores as described in Richter et al (2006), Röhl and Abrams (2000) and Tjallingii et al (2007). This is a widely accepted, semi-quantitative, nondestructive core logging method that provides records of changing element intensities expressed in "total counts", reflecting the geochemical composition of the sediments.…”

Section: Methodsmentioning

confidence: 99%

Hydrological changes in southern Africa over the last 200 Ka as recorded in lake sediments from the Tswaing impact crater

Kristen

Fuhrmann

Thorpe

et al. 2007

South African Journal of Geology

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Sediments from Lake Tswaing (25°24'30'' S, 28°04'59'' E) document hydrological changes in southern Africa over the last 200 kyr. Using high-resolution XRFscanning, basic geochemistry (TIC, TOC, TN), organic petrology and Rock-Eval pyrolysis, we identify intervals of decreased carbonate precipitation, increased detrital input, decreased salinity and decreased autochthonous (algal and bacterial) organic matter content that represent periods of less stable water column stratification and

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High-resolution, downhole, and nondestructive core measurements from Sites 999 and 1001 in the Caribbean Sea: application to the Late Paleocene Thermal Maximum

Cited by 86 publications

References 22 publications

The meridional temperature gradient in the eastern North Atlantic during MIS 11 and its link to the ocean–atmosphere system

The meridional temperature gradient in the eastern North Atlantic during MIS 11 and its link to the ocean–atmosphere system

Coupling of millennial‐scale changes in sea surface temperature and precipitation off northeastern Brazil with high‐latitude climate shifts during the last glacial period

Hydrological changes in southern Africa over the last 200 Ka as recorded in lake sediments from the Tswaing impact crater

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