Aeolian dust in the Talos Dome ice core (East Antarctica, Pacific/Ross Sea sector): Victoria Land versus remote sources over the last two climate cycles

2010 ◽  
Vol 25 (8) ◽  
pp. 1327-1337 ◽  
Author(s):  
Barbara Delmonte ◽  
Carlo Baroni ◽  
Per S. Andersson ◽  
Hans Schoberg ◽  
Margareta Hansson ◽  
...  
Keyword(s):  
Ross Sea ◽  
Ice Core ◽  
East Antarctica ◽  
Aeolian Dust ◽  
Climate Cycles ◽  
Victoria Land

Palaeomagnetic results from the middle Tertiary Meander Intrusives of northern Victoria Land, East Antarctica

1996 ◽  
Vol 8 (1) ◽  
pp. 61-72 ◽  
Author(s):  
Elena Belluso ◽  
Roberto Lanza
Keyword(s):  
Remanent Magnetization ◽  
Ross Sea ◽  
East Antarctica ◽  
Magnetic Mineralogy ◽  
Tilt Correction ◽  
Palaeomagnetic Data ◽  
Victoria Land ◽  
Geological Models ◽  
Laboratory Investigations ◽  
The Antarctic

The Tertiary stocks (Meander Intrusives) cropping out along the coasts of the Ross Sea were sampled for a palaeomagnetic study during the sixth Italian expedition to northern Victoria Land. Laboratory investigations concerned magnetic mineralogy and remanent magnetization. Minerals of the magnetiteulvöspinel series occur in the rocks from all stocks, with low-Ti titanomagnetite usually prevalent. Haematite and goethite occur in small amounts as alteration products. Large secondary components commonly screen the characteristic remanent magnetization and were removed by thermal or AF demagnetization at temperatures or peak-fields higher than 360°C and 20 mT respectively. A total of 10 VGPs were obtained from radiometrically dated rocks (42–22 Ma); the averaged position (69°S, 334°E; α95=9.9°) is the first middle Tertiary palaeomagnetic pole for East Antarctica, and gives evidence for a reversal in the course of the APW path. This evidence is not substantially altered by a supposed tilt-correction consistent with geophysical and geological models for the uplift of the Transantarctic Mountains. No definite conclusion about relative movements between East Antarctica and the Antarctic Peninsula can be drawn from the existing palaeomagnetic data.

scholarly journals TALDICE-1 age scale of the Talos Dome deep ice core, East Antarctica

2011 ◽  
Vol 7 (1) ◽  
pp. 1-16 ◽  
Author(s):  
D. Buiron ◽  
J. Chappellaz ◽  
B. Stenni ◽  
M. Frezzotti ◽  
M. Baumgartner ◽  
...  
Keyword(s):  
Inverse Method ◽  
Ross Sea ◽  
Accumulation Rate ◽  
A Priori ◽  
Ice Core ◽  
East Antarctica ◽  
Last Deglaciation ◽  
Ice Flow ◽  
Climate Record ◽  
The Last Deglaciation

Abstract. A new deep ice core drilling program, TALDICE, has been successfully handled by a European team at Talos Dome, in the Ross Sea sector of East Antarctica, down to 1620 m depth. Using stratigraphic markers and a new inverse method, we produce the first official chronology of the ice core, called TALDICE-1. We show that it notably improves an a priori chronology resulting from a one-dimensional ice flow model. It is in agreement with a posteriori controls of the resulting accumulation rate and thinning function along the core. An absolute uncertainty of only 300 yr is obtained over the course of the last deglaciation. This uncertainty remains lower than 600 yr over Marine Isotope Stage 3, back to 50 kyr BP. The phasing of the TALDICE ice core climate record with respect to the central East Antarctic plateau and Greenland records can thus be determined with a precision allowing for a discussion of the mechanisms at work at sub-millennial time scales.

scholarly journals The impact of glacier retreat from the Ross Sea on local climate: Characterization of mineral dust in the Taylor Dome ice core, East Antarctica

2016 ◽  
Vol 444 ◽  
pp. 34-44 ◽  
Author(s):  
S.M. Aarons ◽  
S.M. Aciego ◽  
P. Gabrielli ◽  
B. Delmonte ◽  
J.M. Koornneef ◽  
...  
Keyword(s):  
Ross Sea ◽  
Mineral Dust ◽  
Ice Core ◽  
East Antarctica ◽  
Glacier Retreat ◽  
Local Climate ◽  
The Impact

scholarly journals Victoria Land, Antarctica: An Improved Geodynamic Interpretation Based on the Strain Rate Field of the Current Crustal Motion and Moho Depth Model

2020 ◽  
Vol 13 (1) ◽  
pp. 87
Author(s):  
Antonio Zanutta ◽  
Monia Negusini ◽  
Luca Vittuari ◽  
Leonardo Martelli ◽  
Paola Cianfarra ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Ross Sea ◽  
East Antarctica ◽  
Gravity Potential ◽  
Moho Depth ◽  
Airborne Gravity ◽  
Narrow Strip ◽  
Continental Scale ◽  
Victoria Land ◽  
Marine Gravity

In Antarctica, the severe climatic conditions and the thick ice sheet that covers the largest and most internal part of the continent make it particularly difficult to systematically carry out geophysical and geodetic observations on a continental scale. It prevents the comprehensive understanding of both the onshore and offshore geology as well as the relationship between the inner part of East Antarctica (EA) and the coastal sector of Victoria Land (VL). With the aim to reduce this gap, in this paper multiple geophysical dataset collected since the 1980s in Antarctica by Programma Nazionale di Ricerche in Antartide (PNRA) were integrated with geodetic observations. In particular, the analyzed data includes: (i) Geodetic time series from Trans Antarctic Mountains DEFormation (TAMDEF), and Victoria Land Network for DEFormation control (VLNDEF) GNSS stations installed in Victoria Land; (ii) the integration of on-shore (ground points data and airborne) gravity measurements in Victoria Land and marine gravity surveys performed in the Ross Sea and the narrow strip of Southern Ocean facing the coasts of northern Victoria Land. Gravity data modelling has improved the knowledge of the Moho depth of VL and surrounding the offshore areas. By the integration of geodetic and gravitational (or gravity) potential results it was possible to better constrain/identify four geodynamic blocks characterized by homogeneous geophysical signature: the Southern Ocean to the N, the Ross Sea to the E, the Wilkes Basin to the W, and VL in between. The last block is characterized by a small but significant clockwise rotation relative to East Antarctica. The presence of a N-S to NNW-SSE 1-km step in the Moho in correspondence of the Rennick Geodynamic Belt confirms the existence of this crustal scale discontinuity, possibly representing the tectonic boundary between East Antarctica and the northern part of VL block, as previously proposed by some geological studies.

Ice record of a 13th century explosive volcanic eruption in northern Victoria Land, East Antarctica

2001 ◽  
Vol 13 (2) ◽  
pp. 174-181 ◽  
Author(s):  
Biancamaria Narcisi ◽  
Marco Proposito ◽  
Massimo Frezzotti
Keyword(s):  
Volcanic Eruption ◽  
Ross Sea ◽  
Regional Climate ◽  
Ice Core ◽  
Volcanic Eruptions ◽  
13Th Century ◽  
Volcanic Event ◽  
Volcanic Province ◽  
The Core ◽  
Victoria Land

A volcanic event, represented by both coarse ash and a prominent sulphate peak, has been detected at a depth of 85.82 m in a 90 m ice core drilled at Talos Dome, northern Victoria Land. Accurate dating of the core, based on counting annual sulphate and nitrate fluctuations and on comparison with records of major known volcanic eruptions, indicates that the event occurred in 1254 ± 2 AD. The source volcano is most likely to be located within the Ross Sea region. In particular, the glass shards have a trachytic composition similar to rocks from The Pleiades and Mount Rittmann (Melbourne volcanic province), about 200 km from Talos Dome. Sulphate concentration is comparable with that of violent extra-Antarctic explosive events recorded in the same core, but atmospheric perturbation was short-lived and localized, suggesting a negligible impact on regional climate. It is suggested that this eruption may represent the most important volcanic explosion in the Melbourne province during the last eight centuries; thus this event may also represent a valuable chrono-stratigraphical marker on the East Antarctic plateau and in adjoining areas.

scholarly journals Deep ice as a geochemical reactor: insights from iron speciation and mineralogy of dust in the Talos Dome ice core (East Antarctica)

2021 ◽  
Author(s):  
Giovanni Baccolo ◽  
Barbara Delmonte ◽  
Elena Di Stefano ◽  
Giannantonio Cibin ◽  
Ilaria Crotti ◽  
...  
Keyword(s):  
Ross Sea ◽  
Mineral Dust ◽  
Ice Core ◽  
Ice Cores ◽  
East Antarctica ◽  
Main Process ◽  
Polar Ice ◽  
Atmospheric Species ◽  
Depositional Processes ◽  
Fe Mineralogy

Abstract. Thanks to its insolubility, mineral dust is considered a stable proxy in polar ice cores. With this study we show that below an ice-depth of 1000 m, the Talos Dome ice core (Ross Sea sector of East Antarctica) presents evident and progressive signs of post-depositional processes affecting the mineral dust records. We applied a suite of established and cutting edge techniques to investigate the properties of dust present in the Talos Dome ice core, ranging from concentration and grain-size to elemental-composition and Fe-mineralogy. Results show that through acidic/oxidative weathering, the conditions of deep ice at Talos Dome promote the dissolution of specific minerals and the englacial formation of others, deeply affecting dust primitive features. The expulsion of acidic atmospheric species from ice-grains and their concentration in localized environments is likely the main process responsible for englacial reactions and is related with ice re-crystallization. Deep ice can be seen as a "geochemical reactor" capable of fostering complex reactions which involve both soluble and insoluble impurities. Fe-bearing minerals can efficiently be used to explore such transformations.

scholarly journals Deep ice as a geochemical reactor: insights from iron speciation and mineralogy of dust in the Talos Dome ice core (East Antarctica)

2021 ◽  
Vol 15 (10) ◽  
pp. 4807-4822
Author(s):  
Giovanni Baccolo ◽  
Barbara Delmonte ◽  
Elena Di Stefano ◽  
Giannantonio Cibin ◽  
Ilaria Crotti ◽  
...  
Keyword(s):  
Ross Sea ◽  
Mineral Dust ◽  
Ice Core ◽  
Ice Cores ◽  
East Antarctica ◽  
Main Process ◽  
Polar Ice ◽  
Atmospheric Species ◽  
Depositional Processes ◽  
Fe Mineralogy

Abstract. Thanks to its insolubility, mineral dust is considered a stable proxy in polar ice cores. With this study we show that the Talos Dome ice core (TALDICE, Ross Sea sector of East Antarctica) displays evident and progressive signs of post-depositional processes affecting the mineral dust record below 1000 m deep. We apply a suite of established and cutting-edge techniques to investigate the properties of dust in TALDICE, ranging from concentration and grain size to elemental composition and Fe mineralogy. Results show that through acidic/oxidative weathering, the conditions of deep ice at Talos Dome promote the dissolution of specific minerals and the englacial formation of others, affecting primitive dust features. The expulsion of acidic atmospheric species from ice grains and their concentration in localized environments is likely the main process responsible for englacial reactions. Deep ice can be seen as a “geochemical reactor” capable of fostering complex reactions which involve both soluble and insoluble impurities. Fe-bearing minerals can efficiently help in exploring such transformations.

scholarly journals Interpreting last glacial to Holocene dust changes at Talos Dome (East Antarctica): implications for atmospheric variations from regional to hemispheric scales

2012 ◽  
Vol 8 (1) ◽  
pp. 145-168 ◽  
Author(s):  
S. Albani ◽  
B. Delmonte ◽  
V. Maggi ◽  
C. Baroni ◽  
J.-R. Petit ◽  
...  
Keyword(s):  
Ross Sea ◽  
Atmospheric Transport ◽  
Spatial Scales ◽  
Ice Core ◽  
Ice Cores ◽  
East Antarctica ◽  
Deposition Flux ◽  
Stable Water Isotopes ◽  
Dust Deposition ◽  
Last Glacial

Abstract. Central East Antarctica ice cores preserve stratigraphic records of mineral dust originating from remote sources in the Southern Hemisphere, and represent useful indicators of climatic variations on glacial-interglacial time scales. The peripheries of the East Antarctic Ice Sheet, where ice-free areas with the potential to emit dust exist, have been less explored from this point of view. Here we present a new profile of dust deposition flux and grain size distributions from an ice core drilled at Talos Dome (Northern Victoria Land, East Antarctica), where there is a significant input of dust from proximal Antarctic ice-free areas. We analyze dust and stable water isotopes variations from the Last Glacial Maximum to the Late Holocene, and compare them to the EPICA Dome C profiles from Central East Antarctica. The smaller glacial-interglacial variations at Talos Dome compared to Dome C, and a distinctive decreasing trend during the Holocene, characterize the TALDICE dust profile. By deciphering the composite dust signal from both remote and local sources, we show the potential of this combined proxy of source activity and atmospheric transport to give information on both regional and larger spatial scales. In particular, we show how a regional signal, which we related to the deglaciation history of the Ross Sea embayment, can be superimposed to the broader scale glacial-interglacial variability that characterizes other Antarctic sites.

scholarly journals Interpreting last glacial to Holocene dust changes at Talos Dome (East Antarctica): implications for atmospheric variations from regional to hemispheric scales

2012 ◽  
Vol 8 (2) ◽  
pp. 741-750 ◽  
Author(s):  
S. Albani ◽  
B. Delmonte ◽  
V. Maggi ◽  
C. Baroni ◽  
J.-R. Petit ◽  
...  
Keyword(s):  
Ross Sea ◽  
Atmospheric Transport ◽  
Spatial Scales ◽  
Ice Core ◽  
Ice Cores ◽  
East Antarctica ◽  
Deposition Flux ◽  
Stable Water Isotopes ◽  
Dust Deposition ◽  
Last Glacial

Abstract. Central East Antarctic ice cores preserve stratigraphic records of mineral dust originating from remote sources in the Southern Hemisphere, and represent useful indicators of climatic variations on glacial-interglacial time scales. The peripheries of the East Antarctic Ice Sheet, where ice-free areas with the potential to emit dust exist, have been less explored from this point of view. Here, we present a new profile of dust deposition flux and grain size distributions from an ice core drilled at Talos Dome (TALDICE, Northern Victoria Land, East Antarctica), where there is a significant input of dust from proximal Antarctic ice-free areas. We analyze dust and stable water isotopes variations from the Last Glacial Maximum to the Late Holocene, and compare them to the EPICA Dome C profiles from central East Antarctica. The smaller glacial-interglacial variations at Talos Dome compared to Dome C and a distinctive decreasing trend during the Holocene characterize the TALDICE dust profile. By deciphering the composite dust signal from both remote and local sources, we show the potential of this combined proxy of source activity and atmospheric transport to give information on both regional and larger spatial scales. In particular, we show how a regional signal, which we relate to the deglaciation history of the Ross Sea embayment, can be superimposed to the broader scale glacial-interglacial variability that characterizes other Antarctic sites.

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