نتایج جستجو برای: abrupt change
تعداد نتایج: 601788 فیلتر نتایج به سال:
Atmospheric deep convection in the west Pacific plays a key role in the global heat and moisture budgets, yet its response to orbital and abrupt climate change events is poorly resolved. Here, we present four absolutely dated, overlapping stalagmite oxygen isotopic records from northern Borneo that span most of the last glacial cycle. The records suggest that northern Borneo's hydroclimate shif...
The ocean's thermohaline circulation has long been recognized as potentially unstable and has consequently been invoked as a potential cause of abrupt climate change on all timescales of decades and longer. However, fundamental aspects of thermohaline circulation changes remain poorly understood.
Models suggest that dramatic changes in the ocean circulation are responsible for abrupt climate changes during the last ice age and may possibly alter the relative climate stability of the last 10,000 years.
Direct North-South synchronization of abrupt climate change record in ice cores using beryllium 10 G. M. Raisbeck, F. Yiou, J. Jouzel, and T. F. Stocker CSNSM/IN2P3/CNRS, Bat 108, 91405 Orsay, France IPSL/LSCE, UMR CEA-CNRS-UVSQ, CE Saclay, 91191 Gif-sur-Yvette, France Climate and Environmental Physics Institute, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland Received: 24 April 200...
International Geoscience Programme (IGCP) Project 495 'Quaternary Land-Ocean Interactions: Driving Mechanisms and Coastal Responses' commenced in 2004, three decades after the first project specifically concerned with sea levels began (Project 61: 1974-82). Over thirty years of co-ordinated international research have produced a detailed picture of the spatial variability inherent in sea level ...
Millimeter wave provides a promising approach for meeting the ever-growing traffic demand in next generation wireless networks. It is crucial to obtain relatively accurate channel state information so that beamforming/combining can be performed to compensate for severe path loss in this band. In contrast to lower frequencies, a typical mobile millimeter wave channel consists of a few dominant p...
It is widely accepted, based on data from the last few decades and on model simulations, that anthropogenic climate change will cause increased fire activity. However, less attention has been paid to the relationship between abrupt climate changes and heightened fire activity in the paleorecord. We use 35 charcoal and pollen records to assess how fire regimes in North America changed during the...
Desert wetlands are keystone ecosystems in arid environments and are preserved in the geologic record as groundwater discharge (GWD) deposits. GWD deposits are inherently discontinuous and stratigraphically complex, which has limited our understanding of how desert wetlands responded to past episodes of rapid climate change. Previous studies have shown that wetlands responded to climate change ...
Eight patients are described who developed infarctions in the vertebral-basilar artery distribution following chiropractic neck manipulation or spontaneous head turning. The angiographic and autopsy findings indicate that injury to the intima of the vertebral artery at the atlantoaxial joint forms a nidus for thrombus formation which may propogate or embolize to involve other vessels in the ver...
We investigated the deep-sea fossil record of benthic ostracodes during periods of rapid climate and oceanographic change over the past 20,000 years in a core from intermediate depth in the northwestern Atlantic. Results show that deep-sea benthic community "collapses" occur with faunal turnover of up to 50% during major climatically driven oceanographic changes. Species diversity as measured b...
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