Results 131 to 140 of about 407 (173)

Biomarker <i>δ</i>¹³C values record consistent savanna vegetation and variable alkalinity of Lake Olduvai during Pleistocene wet/dry cycles. [PDF]

Proc Natl Acad Sci U S A
Doiron KE, Colcord DE, Shilling AM, Njau JK, Stanistreet IG, Stollhofen H, Schick KD, Toth NP, Brassell SC.   +8 more
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Filtering of Milankovitch Cycles by the Thermohaline Circulation

Journal of Climate, 1999
A low-order, basin-averaged, coupled atmosphere‐ocean paleoclimate model is developed and the results from a 3.2-Myr model paleointegration described. A three-basin version of the Wright‐Stocker ocean model is used to compute the thermohaline circulation component of the climate system, with a six-basin energy balance atmosphere coupled to the ocean ...
David Brickman, D. G. Wright, William Hyde   +2 more
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Filtering of Milankovitch Cycles by Earth's Geography

Quaternary Research, 1991
AbstractEarth's land-sea distribution modifies the temperature response to orbitally induced perturbations of the seasonal insolation. We examine this modification in the frequency domain by generating 800,000-yr time series of maximum summer temperature in selected regions with a linear, two-dimensional, seasonal energy balance climate model. Previous
David A. Short, John G. Mengel, Thomas J. Crowley, William T. Hyde, Gerald R. North   +4 more
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Milankovitch cycles in Neocene deep‐sea sediment

Paleoceanography, 1986
Pelagic carbonate sediments from the world ocean basins commonly show cyclic variations in amount and/or degree of preservation of biogenic calcite, with periodicities of several tens to several hundreds of thousands of years. The direct causes of these cycles are fluctuations in noncarbonate dilution, carbonate production, carbonate dissolution, and ...
Walter E. Dean, James V. Gardner
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Milankovitch and sub-Milankovitch cycles of the early Triassic Daye Formation, South China and their geochronological and paleoclimatic implications

Gondwana Research, 2012
article The mass extinction at the end of Permian was followed by a prolonged recovery process with multiple phases of devastation-restoration of marine ecosystems in Early Triassic. The time framework for the Early Triassic geological, biological and geochemical events is traditionally established by conodont biostratigra- phy, but the absolute ...
Huaichun Wu, Shihong Zhang, Qinglai Feng, Ganqing Jiang, Haiyan Li, Tianshui Yang   +5 more
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A new view on the driving mechanism of Milankovitch glaciation cycles

Earth and Planetary Science Letters, 1995
Abstract Dynamical instabilities in the glaciation and deglaciation of the ice sheets can be triggered by pulsations of the rate of change of the orbital and rotational parameters. The purpose of this paper is to demonstrate that the Milankovitch glaciation cycles are extremely sensitive to the rate of change of the obliquity frequency.
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Milankovitch type cycles in the Lower Carboniferous of NW Ireland

Terra Nova, 1989
ABSTRACTA short description of the Lower Carboniferous near Sligo (NW Ireland) is given. Limestones and mark in four measured sections in the Glencar Limestone were numerically coded as plus and minus one, respectively. Such sequences show good and persistent cyclicity with a basic wave length of 200 cm.
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Gender Stereotype and Spatial Reasoning: the Milankovitch Cycles

2017
Stereotype threat, a phenomenon in which learners feel at risk of confirming negative stereotypes about their abilities, is often associated with spatial reasoning abilities in geoscience and has a disproportionately negative effect on women. This study examines how students’ growth or fixed mindsets mediate or amplify the effects of stereotype threat ...
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Milankovitch cycles, eighty years later

Proceedings of 11th International Conference of the Balkan Physical Union — PoS(BPU11), 2023
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