Regional variability of ice core dust composition and provenance in Greenland

2003 ◽  
Vol 4 (12) ◽  
Author(s):  
A. J.-M. Bory ◽  
P. E. Biscaye ◽  
A. M. Piotrowski ◽  
J. P. Steffensen
Keyword(s):  
Ice Core ◽  
Regional Variability ◽  
Dust Composition

A High-Resolution Record of Atmospheric Dust Composition and Variability Since 1650 AD from a Mt. Everest Ice Core

2007 ◽  
Vol preprint (2008) ◽  
pp. 1
Author(s):  
S. Kaspari ◽  
P. A. Mayewski ◽  
M. Handley ◽  
S. Kang ◽  
S. Hou ◽  
...  
Keyword(s):  
High Resolution ◽  
Ice Core ◽  
Atmospheric Dust ◽  
Dust Composition

scholarly journals Intermediate-depth ice coring of high-altitude and polar glaciers with a lightweight drilling system

2005 ◽  
Vol 51 (174) ◽  
pp. 491-501 ◽  
Author(s):  
V. Zagorodnov ◽  
L.G. Thompson ◽  
P. Ginot ◽  
V. Mikhalenko
Keyword(s):  
High Altitude ◽  
Drilling Fluid ◽  
Ice Core ◽  
Ice Cores ◽  
Cutting Fluid ◽  
Intermediate Depth ◽  
Ice Cap ◽  
Dust Composition ◽  
Electric Drill ◽  
Drilling System

AbstractA total of 11 ice cores to a maximum depth of 460 m have been obtained over the past 3 years from high-altitude glaciers on the saddle of Mount Bona and Mount Churchill in Alaska (designated B–C), and on Quelccaya ice cap and Nevado Coropuna in Peru. Ice coring was conducted using an intermediate-depth drilling system. The system includes an electromechanical drill (EMD) and an ethanol thermal electric drill (ETED). The EMD permitted an average ice-core production rate (ICPR) of 7.0 m h−1 down to 150 m. An average ICPR of 2 m h−1 to 460 m depth was possible with the ETED. The quality of the B–C ice cores is better than that of cores previously drilled with an EMD and ETED system. A new cutter design, drilling with a lubricant/cutting fluid and a new anti-torque assembly were tested in the laboratory and in glacier boreholes. We examine the performance of the drills in cold and temperate ice and in clean and particle-laden ice. The influence of the ethanol drilling fluid on ice-core isotopic, ionic and dust composition is discussed.

scholarly journals Volcanic Fluxes Over the Last Millennium as Recorded in the Gv7 Ice Core (Northern Victoria Land, Antarctica)

Geosciences ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 38 ◽  
Author(s):  
Raffaello Nardin ◽  
Alessandra Amore ◽  
Silvia Becagli ◽  
Laura Caiazzo ◽  
Massimo Frezzotti ◽  
...  
Keyword(s):  
Accumulation Rate ◽  
Ice Core ◽  
Ice Cores ◽  
Volcanic Eruptions ◽  
Deposition Flux ◽  
Last Millennium ◽  
Regional Variability ◽  
High Accumulation ◽  
Continental Scale ◽  
Victoria Land

Major explosive volcanic eruptions may significantly alter the global atmosphere for about 2–3 years. During that period, volcanic products (mainly H2SO4) with high residence time, stored in the stratosphere or, for shorter times, in the troposphere are gradually deposited onto polar ice caps. Antarctic snow may thus record acidic signals providing a history of past volcanic events. The high resolution sulphate concentration profile along a 197 m long ice core drilled at GV7 (Northern Victoria land) was obtained by Ion Chromatography on around 3500 discrete samples. The relatively high accumulation rate (241 ± 13 mm we yr −1) and the 5-cm sampling resolution allowed a preliminary counted age scale. The obtained stratigraphy covers roughly the last millennium and 24 major volcanic eruptions were identified, dated, and tentatively ascribed to a source volcano. The deposition flux of volcanic sulphate was calculated for each signature and the results were compared with data from other Antarctic ice cores at regional and continental scale. Our results show that the regional variability is of the same order of magnitude as the continental one.

scholarly journals Rare Earth Elements from an ice core in the Atlantic sector of Antarctica indicate a dust provenance change at the end of the last deglaciation

2011 ◽  
Vol 7 (1) ◽  
pp. 601-633 ◽  
Author(s):  
A. Wegner ◽  
P. Gabrielli ◽  
D. Wilhelms-Dick ◽  
U. Ruth ◽  
M. Kriews ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Ice Core ◽  
South American ◽  
Last Deglaciation ◽  
Multiple Sources ◽  
Atlantic Sector ◽  
Dust Composition ◽  
Dronning Maud Land ◽  
American Source

Abstract. We present a Rare Earth Elements (REE) record at decadal resolution determined in the EPICA ice core drilled in Dronning Maud Land (EDML) in the Atlantic Sector of the East Antarctic Plateau, covering the transition from the last glacial age (LGA) to the early Holocene (26 600–7500 yr BP). Additionally, samples from potential source areas (PSAs) for Antarctic dust were analysed for their REE characteristics. The dust provenance is discussed by comparing the REE fingerprints in the ice core and the PSAs samples. We find a shift in REE composition at 15 200 yr BP in the ice core samples. Before 15 200 yr BP, the dust composition is very uniform and its provenance was likely to be dominated by a South American source. After 15 200 yr BP, multiple sources such as Australia and New Zealand become relatively more important, albeit South America is possibly still an important dust supplier. A similar change in the dust characteristics was observed in the EPICA Dome C ice core at around ~15 000 yr BP. A return to more glacial dust characteristics between ~8300 and ~7500 yr BP, as observed in the EPICA Dome C core, could not be observed in the EDML core. Consequently, the dust provenance at the two sites must have been different at that time.

The last glaciation of east-central Ellesmere Island, Nunavut: ice dynamics, deglacial chronology, and sea level change

2000 ◽  
Vol 37 (10) ◽  
pp. 1355-1371 ◽  
Author(s):  
John England ◽  
I Rod Smith ◽  
David JA Evans
Keyword(s):  
Ice Core ◽  
Ice Cores ◽  
Ellesmere Island ◽  
The Arctic ◽  
Regional Variability ◽  
Ice Dynamics ◽  
East Central ◽  
Baffin Bay ◽  
Ice Stream ◽  
The Impact

During the last glacial maximum of east-central Ellesmere Island, trunk glaciers inundated the landscape, entering the Smith Sound Ice Stream. Accelerator mass spectrometry (AMS) dates on individual shell fragments in till indicate that the ice advanced after 19 ka BP. The geomorphic and sedimentary signatures left by the trunk glaciers indicate that the glaciers were polythermal. The configuration and chronology of this ice is relevant to the reconstruction of ice core records from northwestern Greenland, the history of iceberg rafting of clastic sediments to northern Baffin Bay, the reopening of the seaway between the Arctic Ocean and Baffin Bay, and the regional variability of arctic paleoenvironments. Deglaciation began with the separation of Ellesmere Island and Greenland ice at fiord mouths ~8-8.5 ka BP. Ice reached fiord heads between 6.5 and 4.4 ka BP. Trunk glacier retreat from the fiords of east-central Ellesmere Island occurred up to 3000 years later than in west coast fiords. This later retreat was favoured by (1) impoundment by the Smith Sound Ice Stream in Kane Basin until ~8.5 ka BP, which moderated the impact of high summer melt recorded in nearby ice cores between ~11.5 and 8.5 ka BP; (2) the shallow bathymetry and narrowness (<2 km) of the east coast fiords, which lowered calving rates following separation of Innuitian and Greenland ice; and (3) the likelihood of higher precipitation along east Ellesmere Island. Glaciers throughout the field area readvanced during the late Holocene. The greater advance of coastal glaciers is attributed to their proximity to the North Water polynya in Baffin Bay.

scholarly journals Volcanic fluxes over the last millennium as recorded in the GV7 ice core (Northern Victoria Land, Antarctica)

2020 ◽  
Author(s):  
Rita Traversi ◽  
Silvia Becagli ◽  
Mirko Severi ◽  
Raffaello Nardin ◽  
Laura Caiazzo ◽  
...  
Keyword(s):  
Accumulation Rate ◽  
Ice Core ◽  
Ice Cores ◽  
Volcanic Eruptions ◽  
Deposition Flux ◽  
Last Millennium ◽  
Regional Variability ◽  
High Accumulation ◽  
Continental Scale ◽  
Victoria Land

&lt;p&gt;Explosive volcanic eruptions are able to affect significantly the atmosphere for 2&amp;#8208;3 years. During this time, volcanic products (mainly H2SO4) with high residence &amp;#8232;time are stored in the stratosphere/troposphere, and eventually deposited onto polar ice caps; snow layers may thus record signals providing a history of past &amp;#8232;volcanic events. A high resolution sulphate concentration profile along a 197 m long ice core drilled at GV7 (Northern Victoria Land) was obtained by Ion Chromatography. The relatively high accumulation rate (241&amp;#177;13 mm we yr&lt;sup&gt;-1&lt;/sup&gt;) and the 5&amp;#8208;cm resolution allowed a preliminary counted age scale. The obtained stratigraphy covers roughly the last millennium and 24 major volcanic eruptions were identified, dated and &amp;#8232;ascribed to a source volcano. The deposition flux of volcanic sulfate was calculated and the results were compared with data from other Antarctic ice cores at regional and continental scale. Our results show that the regional variability is of the same order of magnitude &amp;#8232;of the continental scale.&lt;/p&gt;

scholarly journals Change in dust variability in the Atlantic sector of Antarctica at the end of the last deglaciation

2012 ◽  
Vol 8 (1) ◽  
pp. 135-147 ◽  
Author(s):  
A. Wegner ◽  
P. Gabrielli ◽  
D. Wilhelms-Dick ◽  
U. Ruth ◽  
M. Kriews ◽  
...  
Keyword(s):  
Ice Core ◽  
South American ◽  
Last Deglaciation ◽  
Multiple Sources ◽  
Dust Source ◽  
Atlantic Sector ◽  
Glacial Stage ◽  
Dust Composition ◽  
Dronning Maud Land ◽  
American Source

Abstract. We present a Rare Earth Elements (REE) record determined on the EPICA ice core drilled at Dronning Maud Land (EDML) in the Atlantic sector of the East Antarctic Plateau. The record covers the transition from the last glacial stage (LGS) to the early Holocene (26 600–7500 yr BP) at decadal to centennial resolution. Additionally, samples from potential source areas (PSAs) for Antarctic dust were analyzed for their REE characteristics. The dust provenance is discussed by comparing the REE fingerprints in the ice core and the PSA samples. We find a shift in variability in REE composition at ~15 000 yr BP in the ice core samples. Before 15 000 yr BP, the dust composition is very uniform and its provenance was most certainly dominated by a South American source. After 15 000 yr BP, multiple sources such as Australia and New Zealand become relatively more important, although South America remains the major dust source. A similar change in the dust characteristics was observed in the EPICA Dome C ice core at around ~15 000 yr BP, accompanied by a shift in the REE composition, thus suggesting a change of atmospheric circulation in the Southern Hemisphere.

Estimating the style and duration of former glaciation in the mountains of Britain and Ireland

2020 ◽  
Author(s):  
Iestyn Barr ◽  
Jeremy Ely ◽  
Matteo Spagnolo ◽  
Ian Evans ◽  
Matt Tomkins
Keyword(s):  
Landscape Evolution ◽  
Ice Core ◽  
Balance Model ◽  
Glacial Cycle ◽  
Regional Variability ◽  
Model Driven ◽  
The Past ◽  
Simple Mass ◽  
Core Project

&lt;p&gt;With a view to better understanding landscape evolution, we model the style and duration of former mountain glaciation in Britain and Ireland during the Quaternary (i.e., the past 2.6 Ma). We use a simple mass balance model, driven by published temperature depression data from the Greenland Ice Core Project (for the past 120 ka), and from a benthic &amp;#948;18O stack (for the Quaternary as a whole). Though there are limitations to this approach, results provide first-order estimates and indicate that during the Quaternary as a whole, the mountains of Britain and Ireland were glacier-free for 1.1 &amp;#177; 0.5 Ma; occupied by small (cirque) glaciers for 0.3 &amp;#177; 0.2 Ma; and occupied by large glaciers for 1.1 &amp;#177; 0.4 Ma. During the most recent glacial cycle specifically (i.e., the last 120 ka), these areas were glacier-free for an average of 52.0 &amp;#177; 21.2 ka; occupied by small (cirque) glaciers for 16.2 &amp;#177; 9.9 ka; and occupied by large glaciers, including ice sheets, for 51.8 &amp;#177; 18.6 ka. Here, we investigate some of the regional variability in these estimates, and consider implications for long-term landscape evolution.&lt;/p&gt;

ICICLE - Ice Core Integrated Calescent Linear Extractor

2018 ◽  
Author(s):  
Bhavi Jagatia ◽  
Hannah M. Klapper ◽  
Ana Diaz Artiles
Keyword(s):  
Ice Core
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