A synchronized dating of three Greenland ice cores throughout the Holocene

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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. However, precise understanding of Holocene climate variability on multidecadal to millennial scales has been elusive owing to the lack of adequate archives recording small temperature signals and poorer chronologies further back in time 3. This method relies on temperature-dependent gas fractionation in the unconsolidated snow layer 5.

Volcanic influence on centennial to millennial Holocene Greenland temperature change

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?

The GISP2 and GRIP ice cores were drilled 3 km to bedrock in the early ies, notably δ18O, and those in other climate archives containing material suitable for 14C dating. most precisely dated of all the Holocene Greenland core records. The plotted δ18O records are closely synchronized back as far as 12, BP, but.

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. Climate has surprised humans during historic and likely pre-historic times, causing sudden alterations in agriculture, ecology and economy, and may do so in the future. We argue that the climate change with the most magnified impacts on society may be a negative temperature anomaly that abruptly decreases resource availability over wide spatial scales.

Keywords Geochronology; dendroclimatology; historical agriculture; palaeoclimate volcanism. E-mail: samuli. Polar Research Helama et al.

Volcanic influence on centennial to millennial Holocene Greenland temperature change

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.

David Fisher,1* Erich Osterberg,3 Art Dyke,1 Dorthe Dahl-Jensen,5. Mike Demuth,1 it has no prominence in the eastern Arctic ice cores (Clausen et al.,. ; Zheng et GISP2 Greenland core there are extremely high volcanic SO4. − lev- Olsen, J. and Heinemeier, J. A synchronized dating of three. Greenland.

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A synchronized dating of three Greenland ice cores throughout the Holocene

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A synchronized dating of three Greenland ice cores throughout the Holocene. Research output: Contribution to journal/Conference contribution in.

Markova A. Chief -Scott A. Elsevier B. Puzachenko A. Paris, 23—28 August Ramsey Ch. Rasmussen S. D, doi L, Juel B. Svensson A. Vinther, B. Whittaker R.

How are ice cores dated?

Alley, C. Shuman, D. Meese, A.

synchronizing ice core records, aiding the consffuction of a single Greenland of three Greenland cores in the search for tephra from specific eruptions that might facilitate the linkage of ice core records, the dating of prehistoric tephras and the.

Either your web browser doesn’t support Javascript or it is currently turned off. In the latter case, please turn on Javascript support in your web browser and reload this page. 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.

How are ice cores dated?

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.

Comment on “A synchronized dating of three Greenland ice cores throughout the Holocene” by B. M. Vinther et al. Denton, Joanna S.; Pearce, Nicholas J. G.

Several decades of ice-penetrating radar surveys of the Greenland and Antarctic ice sheets have observed numerous widespread internal reflections. Analysis of this radiostratigraphy has produced valuable insights into ice sheet dynamics and motivates additional mapping of these reflections. Here we present a comprehensive deep radiostratigraphy of the Greenland Ice Sheet from airborne deep ice-penetrating radar data collected over Greenland by The University of Kansas between and To map this radiostratigraphy efficiently, we developed new techniques for predicting reflection slope from the phase recorded by coherent radars.

When integrated along track, these slope fields predict the radiostratigraphy and simplify semiautomatic reflection tracing. Core-intersecting reflections were dated using synchronized depth-age relationships for six deep ice cores. Additional reflections were dated by matching reflections between transects and by extending reflection-inferred depth-age relationships using the local effective vertical strain rate.

The oldest reflections, dating to the Eemian period, are found mostly in the northern part of the ice sheet. Within the onset regions of several fast-flowing outlet glaciers and ice streams, reflections typically do not conform to the bed topography. Disrupted radiostratigraphy is also observed in a region north of the Northeast Greenland Ice Stream that is not presently flowing rapidly.

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A synchronized dating of three Greenland ice cores throughout the Holocene. B. M. Vinther,1 H. B. Clausen,1 S. J. Johnsen,1 S. O. Rasmussen.

Vinther, H. Clausen, S. Johnsen, S. Rasmussen, Katrine Krogh Andersen, S. Buchardt, D. Siggaard-Andersen, J. Steffensen, A. Svensson, J. Olsen, J.

Studying ice cores in Antarctica


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