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| Titel |
Glacial atmospheric phosphorus deposition |
| VerfasserIn |
Helle Astrid Kjær, Remi Dallmayr, Jacopo Gabrieli, Kumiko Goto-Azuma, Motohiro Hirabayashi, Anders Svensson, Paul Vallelonga |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250123709
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| Publikation (Nr.) |
 EGU/EGU2016-3006.pdf |
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| Zusammenfassung |
| Phosphorus in the atmosphere is poorly studied and thus not much is known about
atmospheric phosphorus and phosphate transport and deposition changes over time, though it
is well known that phosphorus can be a source of long-range nutrient transport, e.g. Saharan
dust transported to the tropical forests of Brazil.
In glacial times it has been speculated that transport of phosphorus from exposed shelves
would increase the ocean productivity by wash out. However whether the exposed
shelf would also increase the atmospheric load to more remote places has not been
investigated.
Polar ice cores offer a unique opportunity to study the atmospheric transport of aerosols
on various timescales, from glacial-interglacial periods to recent anthropogenic
influences.
We have for the first time determined the atmospheric transport of phosphorus to the
Arctic by means of ice core analysis. Both total and dissolved reactive phosphorus were
measured to investigate current and past atmospheric transport of phosphorus to the
Arctic.
Results show that glacial cold stadials had increased atmospheric total phosphorus mass
loads of 70 times higher than in the past century, while DRP was only increased by a
factor of 14. In the recent period we find evidence of a phosphorus increase over
the past 50 yrs in ice cores close to human occupation likely correlated to forest
fires.
References:
Kjær, Helle Astrid, et al. "Continuous flow analysis method for determination of
dissolved reactive phosphorus in ice cores." Environmental science & technology 47.21
(2013): 12325-12332.
Kjær, Helle Astrid, et al. "Greenland ice cores constrain glacial atmospheric fluxes
of phosphorus." Journal of Geophysical Research: Atmospheres120.20 (2015). |
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