A Synchronized Dating Of Three Greenland Ice Cores Throughout The Holocene

A Synchronized Dating Of Three Greenland Ice Cores Throughout The Holocene

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.

Volcanic influence on centennial to millennial Holocene Greenland temperature change

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. A few ice cores from high-elevation glaciers in the Himalayas Thompson et al.

In order to make proper interpretation of ice core records, it is essential to establish accurate and precise ice core chronologies that assign an age to each depth segment of the core.

in three ice cores (GISP2, NGRIP, and Dome Fuji) as well as gas loss we also note that shallow late Holocene ice cores often had nearly intact shapes (no A synchronized dating of three Greenland ice cores through-.

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 [4] 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. In the Southern Hemisphere and some areas of the Northern Hemisphere, such as southeastern North America, a slight warming occurred. The presence of a distinct cold period at the end of the LGM interval has been known for a long time. The Younger Dryas is the youngest and longest of three stadials , which resulted from typically abrupt climatic changes that took place over the last 16, years.

Younger Dryas

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A synchronized dating of three Greenland ice cores throughout the Holocene. BM Vinther, HB Clausen, SJ Johnsen, SO Rasmussen, KK Andersen, Journal of.

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Volcanic influence on centennial to millennial Holocene Greenland temperature change

Geochronological data of the conifer tree rings in a region sensitive to climatic effects of explosive eruptions were analysed for sudden growth reductions in association with extraordinarily cool reconstructed summer temperatures since B. Calendar year dates when the tree-ring signatures i. Previous new evidence are in agreement in demonstrating volcanism behind late-Holocene events in A.

Our data show that earlier events were found to have occurred in the years B. Interestingly, events of lesser magnitude followed the three major events in A. Natural disasters, and grain crop failures, occurred as a result of these events, as has been documented for the summer of A.

A synchronized dating of three Greenland ice cores throughout the Holocene. J. Geophys. Res. , D (). doi/.

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A synchronized dating of three Greenland ice cores throughout the Holocene

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 :

timescales over the Holocene – Bayesian wiggle-matching of cosmogenic tion, as well as (iii) carbon cycle effects on 14C, and (iv) in leading to a dating bias that propagates throughout large parts F. Adolphi and R. Muscheler: Synchronizing the Greenland ice core and radiocarbon timescales.

Markova A. Chief -Scott A. Elsevier B. Puzachenko A. Paris, 23—28 August Ramsey Ch. Rasmussen S.

Younger Dryas

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Comment on “A synchronized dating of three Greenland ice cores throughout the Holocene” by B M Vinther et al: No Minoan tephra in the B.C. Layer of.

Solar variability has been hypothesized to be a major driver of North Atlantic millennial-scale climate variations through the Holocene along with orbitally induced insolation change. However, another important climate driver, volcanic forcing has generally been underestimated prior to the past 2, years partly owing to the lack of proper proxy temperature records. Here, we reconstruct seasonally unbiased and physically constrained Greenland Summit temperatures over the Holocene using argon and nitrogen isotopes within trapped air in a Greenland ice core GISP2.

We show that a series of volcanic eruptions through the Holocene played an important role in driving centennial to millennial-scale temperature changes in Greenland. Therefore, we conclude that volcanic activity played a critical role in driving centennial to millennial-scale Holocene temperature variability in Greenland and likely beyond. Holocene climate variability is important to understand the process of human societal development from a hunter-gatherer society to the present complex society 1 , 2.

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