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Astronomy in Space with David Dickinson. By: David Dickinson May 14, 1. You can unsubscribe anytime. You never know where an astronomical event might turn up in old historical records, and how it might link up with evidence from modern science. Researchers at the University of Geneva recently uncovered such an astronomical tale from the archives, using contemporary accounts of a curiously dark lunar eclipse to give insight into volcanic eruptions and their effect medieval climate. The researchers, who published their study April 21st in Scientific Reports , were examining ice cores from Greenland and Antarctica over the past couple millennia, looking for sulfate spikes that would indicate volcanic eruptions.
Ice Cores, Seafloor Sediments, and the Age of the Earth, Part 1
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Documentation for WAIS Divide Ice Core Images, Antarctica, Version 1
Englacial radar reflectors in the central West Antarctic Ice Sheet contain information about past dynamics and ice properties. Due to significant data coverage in this area, these isochronous reflectors can be traced over large portions of the ice sheet, but assigning ages to the reflectors for the purpose of studying dynamics requires incorporation of chronologic data from ice cores. To date reflectors in the Marie Byrd Land region, we consider the Byrd ice core, strategically located between the catchments of Thwaites Glacier and the Siple Coast ice streams.
Dating of ice cores is done using a combination of annual layer counting and computer modelling. Ice core time scales can be applied to other ice cores or even to.
The oldest ice core ever drilled outside the polar regions may contain ice that formed during the Stone Age — more than , years ago, long before modern humans appeared. Researchers from the United States and China are now studying the core — nearly as long as the Empire State Building is tall — to assemble one of the longest-ever records of Earth’s climate history.
What they’ve found so far provides dramatic evidence of a recent and rapid temperature rise at some of the highest, coldest mountain peaks in the world. The change is most noticeable on the Guliya Ice Cap, where they drilled the latest ice core. In this region, the average temperature has risen 1. Lonnie Thompson, Distinguished University Professor in the School of Earth Sciences at The Ohio State University and co-leader of the international research team, said that the new data lend support to computer models of projected climate changes.
There, glaciologist Yao Tandong secured funding for a series of joint expeditions from the Chinese Academy of Sciences. Continued warming in these regions will result in even more ice melt with the likelihood of catastrophic environmental consequences,” Yao noted.
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Documentation for WAIS Divide Ice Core Images, Antarctica, Version 1 For more information, or to download the image processing software, visit the Desert Dating Annual Layers of a Shallow Antarctic Ice Core with an Optical Scanner.
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May 12, report. In their paper published in Proceedings of the National Academy of Sciences , the team describes their study of the newly retrieved ice cores and how it is helping to better understand the changes to the Earth’s ice ages. The cores were taken from a part of Antarctica known as Allan Hills—there unique geography has caused glaciers sliding down mountains to slide upwards for a bit. Additional erosion due to wind and precipitation has caused very old blue ice to lie close enough to the surface to be extracted via core drilling.
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Find out why ice core research is so important for our understanding of climate change and how we drill and analyse the ice cores. For a detailed look at how ice cores are recovered from Antarctica watch this video. Why do scientists drill ice cores? What makes ice cores so useful for climate research? Where do you drill them?
How deep are the ice cores drilled? What has so far been discovered with ice core research?
Ice cores store atmospheric bubbles from a million years ago
Research article 16 Jul Correspondence : Shugui Hou shugui nju. An accurate chronology is the essential first step for a sound understanding of ice core records. However, dating ice cores drilled from the high-elevation glaciers is challenging and often problematic, leading to great uncertainties. The Guliya ice core, drilled to the bedrock
To date, these rapid changes in climate and ocean circulation are still not fully GICC05 ice core chronology, and computed the associated dating The figures were generated using the Ocean Data View software, the.
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