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By Harunur Rashid, Leonid Polyak, Ellen Mosley-Thompson

ISBN-10: 111867152X

ISBN-13: 9781118671528

Published through the yank Geophysical Union as a part of the Geophysical Monograph Series.Abrupt weather swap: Mechanisms, styles, and Impacts brings jointly a various crew of paleoproxy files reminiscent of ice cores, marine sediments, terrestrial (lakes and speleothems) information, and paired ocean-atmosphere weather types to rfile contemporary advances in knowing the mechanisms of abrupt weather alterations. because the discovery of the Dansgaard-Oeschger occasions in Greenland ice cores and the following discovery in their modern occasions within the marine sediments of the North Atlantic, the hunt for those abrupt, millennial-scale occasions around the globe has intensified, and hence, the variety of paleoclimatic files chronicling such occasions has elevated. the amount highlights contain discussions of files of prior weather variability, meridional overturning...

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Flower et al. [this volume] review planktonic Mg/Ca-δ18O evidence from the Gulf of Mexico (GOM) to investigate the role of meltwater input from the LIS in abrupt climate change during MIS 3 and the last deglaciation. The chapter provides an important summary of the current understanding of the ACC in the GOM by synthesizing data mostly presented by Flower et al. [2004], Hill et al. [2006], and Williams et al. [2010]. , 2006]. Flower et al. [this volume] conclude that (1) LIS meltwater pulses started during Heinrich stadials and lasted through the subsequent D-O events; (2) LIS meltwater pulses appear to coincide with the major AIM events; and (3) LIS meltwater discharge is associated with distinct changes in deep ocean circulation in the North Atlantic during H events.

Rial and Saha [this volume] simulate the D-O cycles using a conceptual model, based on simple stochastic differential equations, termed the sea ice oscillator (SIO), which borrowed elements from the Saltzman et al. [1981] concept. Simulation results show that sea ice extent and mean ocean temperature can be driven by changes in orbital insolation, which play a dominant role in controlling atmospheric temperature variability. The SIO model has two internal parameters controlling the abruptness of temperature change: the free frequency of the oscillator and the intensity of positive feedbacks.

Denton, G. , W. S. Broecker, and R. B. , 14(2), 14–16. , C. Hillaire-Marcel, J. L. Turon, and J. Matthiessen (2000), Reconstruction of sea-surface temperature, salinity, and sea-ice cover in the northern North Atlantic during the last glacial maximum based on dinocyst assemblages, Can. J. , 37, 725–750. EPICA Community Members et al. (2006), One-to-one coupling of glacial climate variability in Greenland and Antarctica, Nature, 444, 195–198. Flower, B. , D. W. Hastings, H. W. Hill, and T. M. Quinn (2004), Phasing of deglacial warming and Laurentide Ice Sheet meltwater in the Gulf of Mexico, Geology, 32, 597–600.

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Abrupt Climate Change. Mechanisms, Patterns, and Impacts by Harunur Rashid, Leonid Polyak, Ellen Mosley-Thompson

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