Particle shape accounts for instrumental discrepancy in ice core dust size distributions

Simonsen, Marius; Cremonesi, Llorenç; Baccolo, Giovanni; Bosch, Samuel; Delmonte, Barbara; Erhardt, Tobias; Kjær, Helle Astrid; Potenza, M. A. C.; Svensson, Anders; Vallelonga, Paul

doi:10.5194/cp-2017-149

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…Furthermore, the Coulter counter captures a slightly larger range of particle sizes (0.7 to 20.0 μm) than the Abakus. Another aspect to consider is that ice core dust is generally nonspherical, which affects the Abakus and Coulter counter in different ways (Simonsen et al, ). The insoluble dust mass data from Aarons from Aarons et al (; also determined by Coulter counter) are similarly elevated with respect to the Abakus data, supporting the idea that the discrepancy is due to measurement techniques.…”

Section: Resultsmentioning

confidence: 99%

A Horizontal Ice Core From Taylor Glacier, Its Implications for Antarctic Climate History, and an Improved Taylor Dome Ice Core Time Scale

Baggenstos

Severinghaus

Mulvaney

et al. 2018

Paleoceanog and Paleoclimatol

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Ice core records from Antarctica show mostly synchronous temperature variations during the last deglacial transition, an indication that the climate of the entire continent reacted as one unit to the global changes. However, a record from the Taylor Dome ice core in the Ross Sea sector of East Antarctica has been suggested to show a rapid warming, similar in style and synchronous with the Oldest Dryas—Bølling warming in Greenland. Since publication of the Taylor Dome record, a number of lines of evidence have suggested that this interpretation is incorrect and reflects errors in the underlying time scale. The issues raised regarding the dating of Taylor Dome currently linger unresolved, and the original time scale remains the de facto chronology. We present new water isotope and chemistry data from nearby Taylor Glacier to resolve the confusion surrounding the Taylor Dome time scale. We find that the Taylor Glacier record is incompatible with the original interpretation of the Taylor Dome ice core, showing that the warming in the area was gradual and started at ∼18 ka BP (before 1950) as seen in other East Antarctic ice cores. We build a consistent, up‐to‐date Taylor Dome chronology from 0 to 60 ka BP by combining new and old age markers based on synchronization to other ice core records. The most notable feature of the new TD2015 time scale is a gas age—ice age difference of up to 12,000 years during the Last Glacial Maximum, by far the largest ever observed.

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Section: Resultsmentioning

confidence: 99%

A Horizontal Ice Core From Taylor Glacier, Its Implications for Antarctic Climate History, and an Improved Taylor Dome Ice Core Time Scale

Baggenstos

Severinghaus

Mulvaney

et al. 2018

Paleoceanog and Paleoclimatol

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Aerosol-Climate Interactions During the Last Glacial Maximum

Albani

Balkanski

Mahowald

et al. 2018

Curr Clim Change Rep

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Purpose of Review Natural archives are imprinted with signs of the past variability of some aerosol species in connection to major climate changes. In certain cases, it is possible to use these paleo-observations as a quantitative tool for benchmarking climate model simulations. Where are we on the path to use observations and models in connection to define an envelope on aerosol feedback onto climate? Recent Findings On glacial-interglacial time scales, the major advances in our understanding refer to mineral dust, in terms of quantifying its global mass budget, as well as in estimating its direct impacts on the atmospheric radiation budget and indirect impacts on the oceanic carbon cycle. Summary Even in the case of dust, major uncertainties persist. More detailed observational studies and model intercomparison experiments such as in the Paleoclimate Modelling Intercomparison Project phase 4 will be critical in advancing the field. The inclusion of new processes such as cloud feedbacks and studies focusing on other aerosol species are also envisaged.

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Particle shape accounts for instrumental discrepancy in ice core dust size distributions

Cited by 2 publications

References 16 publications

A Horizontal Ice Core From Taylor Glacier, Its Implications for Antarctic Climate History, and an Improved Taylor Dome Ice Core Time Scale

A Horizontal Ice Core From Taylor Glacier, Its Implications for Antarctic Climate History, and an Improved Taylor Dome Ice Core Time Scale

Aerosol-Climate Interactions During the Last Glacial Maximum

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