(2010). Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11. Paleoceanography, 25 PA3208. For guidance on citations see FAQs. Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online's data pol...

[1] Climate dynamics during the marine isotope stage (MIS) 11 interglacial may provide information about how the climate system will evolve under the conditions of low‐amplitude orbital forcing that are also found during the late Holocene. New stable isotope and alkenone data are presented from southeast Atlantic Ocean Drilling Program Site 1085, providing detailed information on interglacial c...

The pollen record from Elk Lake is interpreted in climatic terms by three different numerical approaches. The paleoclimatic record inferred for Elk Lake can be described as a sequence of climatic zones, separated by short transitional intervals: (1) the cold and dry late glacial zone (11,600-11,000 varve yr), (2) the cool and moist early Holocene zone (10,000-8500 varve yr), (3) the warm and dr...

[1] This study presents a comparison of sea surface temperature (SST) estimates based on Mg/Ca ratios of Globigerinoides ruber and alkenone unsaturation index (U37 K0) in core sediment recovered from the Gulf of Guinea, eastern equatorial Atlantic. Mg/Caand U37 K0-based SST estimates yield fairly comparable results for the time interval 21,000–14,500 years and for the late Holocene. The early a...

Rhines and Huybers (1) are correct that the decreasing number of measurement stations in recent years contributed slightly to our calculated increase of extreme summer mean temperature anomalies (2). However, the increased frequency of extreme heat anomalies is accounted for mainly by (i) higher mean temperature of recent decades relative to the base period 1951–1980, and (ii) the continuing up...

Nine sections from the Sajama ice core recovered from the summit of an extinct Andean volcano in Bolivia were analysed for various heavy metals to assess anthropogenic changes in the tropical upper troposphere over South America. These sam ples include two sections dating from 14, 100 to 19,200 years BP, corresponding to the Last Glacial Stage (LOS), one section dating from 2800 years BP (the l...

The amounts and types of carbon delivered to the sediments Seneca Lake, New York, have varied since the middle Holocene. Concentrations of CaCO first fluctuate between 14 and 6% around 7 ka before decreasing erratically 3 until about 5 ka and then remain 2% in younger sediments. Because the amount of calcite that precipitates in hard-water lakes is related to summertime thermal stratification, ...

[1] We present a suite of new 20,000 year reconstructions that integrate three types of geothermal information: a global database of terrestrial heat flux measurements, another database of temperature versus depth observations, and the 20th century instrumental record of temperature, all referenced to the 1961–1990 mean of the instrumental record. These reconstructions show the warming from the...

To better understand what drives El Niño, an analytical model of the coupled ocean-atmosphere system over the equatorial Pacific is constructed. The equatorial atmosphere is approximated as a linear feedback system whose surface winds are driven by sea surface temperature (SST) gradients and whose thermal effect is to restore the entire equatorial SST to its maximum value-the SST of the warm-po...

The recently developed Bayesian multinomial calibration model, Bummer, was applied to the fossil chironomid assemblages of a lake situated at the present tree-line in northern Fennoscandia to reconstruct patterns in Holocene climates. The results are compared with inferences derived using non-Bayesian weighted averaging partial least-squares regression. The reconstruction exhibits both long-ter...