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Radiostratigraphy and age structure of the Greenland Ice Sheet
Ahagon, K. Ohkushi, M. Uchida, and T. Mishima , Mid-depth circulation in the northwest Pacific during the last deglaciation: Evidence from foraminiferal radiocarbon ages , Geophysical Research Letters , vol. DOI : Araguas-araguas, K.
Reply to comment by J. S. Denton and N. J. G. Pearce on “A synchronized dating of three Greenland ice cores throughout the holocene”Journal.
Vinther, H. Clausen, S. Johnsen, S. Rasmussen, Katrine Krogh Andersen, S. Buchardt, D. Siggaard-Andersen, J. Steffensen, A. Svensson, J. Olsen, J. A synchronized dating of three Greenland ice cores throughout the Holocene.
How are ice cores dated?
Ice cores from Antarctica, from Greenland, and from a number of smaller glaciers around the world yield a wealth of information on past climates and environments. Ice cores offer unique records on past temperatures, atmospheric composition including greenhouse gases , volcanism, solar activity, dustiness, and biomass burning, among others. In Antarctica, ice cores extend back more than , years before present Jouzel et al.
Denton, J.S., Pearce, N.J.G., Comment on “A synchronized dating of three. Greenland ice cores throughout the Holocene” by B.M. Vinther et al.: no Minoan.
Here we use a continuous ice core dust record from the Renland ice cap on the east coast of Greenland to constrain the timing of changes to the ice sheet margin and relative sea level over the last glacial cycle. During the Holocene and the previous interglacial period Eemian the dust record was dominated by coarse particles consistent with rock samples from central East Greenland. From the coarse particle concentration record we infer the East Greenland ice sheet margin advanced from These findings constrain the possible response of the Greenland ice sheet to climate forcings.
Although ice cores are geographical point measurements, they represent a record of air, water and aerosols transported to the ice over regional or even hemispheric scales.
A synchronized dating of three Greenland ice cores throughout the Holocene
Guest commentary from Jonny McAneney. You heard it here first …. Back in February, we wrote a post suggesting that Greenland ice cores may have been incorrectly dated in prior to AD This was based on research by Baillie and McAneney which compared the spacing between frost ring events physical scarring of living growth rings by prolonged sub-zero temperatures in the bristlecone pine tree ring chronology, and spacing between prominent acids in a suite of ice cores from both Greenland and Antarctica.
Last month, in an excellent piece of research Sigl et al.
a characteristic pattern of three significant acidity peaks that are present in both cores. Ice core dating based on annual layer counting is limited by the bipolar synchronization of ice cores, the Greenland ice core chronologies have been some probabilistic limitations in the present Holocene lay- ering.
When data from more than one ice core is available in a certain time period, it is often very helpful to synchronize the ice cores during the dating effort. In this way, the accuracy of the dating can be improved and the time scale can be applied to both cores at the same time, greatly improving the value of the data for investigating the dynamics of past climate.
Synchronization can be achieved by matching layers of high acidity or high impurity content in the cores. Volcanic layers are more acidic than the surrounding ice due to the large amount of sulphuric acid generated in the atmosphere by the release of sulphate from volcanic eruptions. When two or more cores have been synchronized in a certain interval, it is possible to carry out the annual layer counting in all cores simultaneously, using that the same number of annual layers must be present in the same interval in all ice cores see lower part of the figure above.
In this way, the counting can be based on many parallel, independent data profiles, and the approach thus reduces the dating uncertainty and provides ice core records that are reliably synchronized. When annual layers were counted for the construction of the GICC05 time scale , parallel dating was performed as outlined above wherever data were available.
Black lines mark volcanic layers that have been used for synchronizing the cores. Source: A synchronized dating of three Greenland ice cores throughout the Holocene. Synchronized records are very valuable when investigating the climatic signals in the ice cores, because small differences in the climate records can be reliably interpreted, and because small differences in the timing of past climate shifts may give important hints about the dynamics of the climate system.
A synchronized dating of three greenland ice cores throughout the holocene
I was wondering how ice cores are dated accurately. I know Carbon 14 is one method, but some ice cores go back hundreds of thousands of years. Would other isotopes with longer half-lives be more accurate? Also, how much does it cost to date the core? How are samples acquired without destroying the ice?
Landscape stability and destabilisation in the prehistory of Greece. A synchronized dating of three Greenland ice cores throughout the Holocene. Journal of.
The system can’t perform the operation now. Try again later. Citations per year. Duplicate citations. The following articles are merged in Scholar. Their combined citations are counted only for the first article. Merged citations. This “Cited by” count includes citations to the following articles in Scholar.
Volcanic influence on centennial to millennial Holocene Greenland temperature change
Markova A. Chief -Scott A. Elsevier B. Puzachenko A. Paris, 23—28 August
As part of the effort to create the new Greenland Ice Core Chronology (GICC05) a synchronized stratigraphical timescale for the Holocene.
It is named after an indicator genus , the alpine – tundra wildflower Dryas octopetala , as its leaves are occasionally abundant in late glacial, often minerogenic-rich sediments, such as the lake sediments of Scandinavia. Physical evidence of a sharp decline in temperature over most of the Northern Hemisphere has been discovered by geological research. This temperature change occurred at the end of what the earth sciences refer to as the Pleistocene epoch and immediately before the current, warmer Holocene epoch.
In archaeology , this time frame coincides with the final stages of the Upper Paleolithic in many areas. The Younger Dryas was the most recent and longest of several interruptions to the gradual warming of the Earth’s climate since the severe LGM, about 27, to 24, years BP. It is thought  to have been caused by a decline in the strength of the Atlantic meridional overturning circulation , which transports warm water from the Equator towards the North Pole , in turn thought to have been caused by an influx of fresh, cold water from North America to the Atlantic.
The Younger Dryas was a period of climatic change, but the effects were complex and variable.