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| Titel |
Continuous acidity measurements of the Roosevelt Island (coastal Antarctica) ice core |
| VerfasserIn |
Helle Astrid Kjær, Paul Vallelonga, Marius Simonsen, Nancy Bertler, Peter Neff, Anders Svensson |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250109188
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| Publikation (Nr.) |
 EGU/EGU2015-9072.pdf |
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| Zusammenfassung |
| A novel dye-based continuous flow analysis method for the determination of acidity has been
developed and applied to the Roosevelt Island ice core. The Roosevelt Island ice core (79.36Ë
S, 161.71°W) was drilled in 2011-13 at the top of the Roosevelt Island ice dome, a location
surrounded by the Ross ice shelf. The site has high accumulation; 0.26 m of ice equivalent is
deposited annually allowing sub-annual determination of conductivity, calcium and
acidity.
The proximity to the ocean combined with the low altitude makes the RICE ice core
loaded with sea salts, which dominate the conductivity signal. Similarly Ca2+, which was
measured by Continuous Flow Analysis, is primarily of oceanic origin. The proximity of the
ocean also leads to high background levels of acidity (primarily sulphate) which mask
volcanic peaks and thus complicate the identification of tropical volcanic eruptions. Using a
combined approach of high resolution acidity, melt water conductivity and calcium
measurements we have succeeded in identifying more than 450 volcanic eruptions in the top
500 metres of the RICE ice core. The combination of high-resolution acidity and calcium
records allow for speculation into the inverse relationship between the two, which may be
related to sea ice extent in the nearby Ross and Amundsen seas. Please fill in your abstract
text. |
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