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| Titel |
Relation between surface topography and sea-salt snow chemistry from Princess Elizabeth Land, East Antarctica |
| VerfasserIn |
K. Mahalinganathan, M. Thamban, C. M. Laluraj, B. L. Redkar |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 6, no. 2 ; Nr. 6, no. 2 (2012-04-18), S.505-515 |
| Datensatznummer |
250003495
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| Publikation (Nr.) |
 copernicus.org/tc-6-505-2012.pdf |
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| Zusammenfassung |
| Previous studies on Antarctic snow have established an unambiguous
correlation between variability of sea-salt records and site specific
features like elevation and proximity to the sea. On the other hand,
variations of Cl−/Na+ ratios in snow have been attributed to the
reaction mechanisms involving atmospheric acids. In the present study, the
annual records of Na+, Cl− and SO42− were investigated
using snow cores along a 180 km coast to inland transect in Princess
Elizabeth Land, East Antarctica. Exceptionally high Na+ concentrations
and large variations in Cl−/Na+ ratios were observed up to 50 km
(∼1100 m elevation) of the transect. The steepest slope in the entire
transect (49.3 m km−1) was between 20 and 30 km and the sea-salt
records in snow from this area revealed extensive modifications, with
Cl−/Na+ ratios as low as 0.2. Statistical analysis showed a strong
association between the slope and variations in Cl−/Na+ ratios
along the transect (r = −0.676, 99% confidence level). While distance
from the coast accounted for some variability, the altitude by itself has
no significant control over the sea-salt ion variability. However, the steep
slopes influence the deposition of sea-salt aerosols in snow. The wind
redistribution of snow due to the steep slopes on the coastal escarpment
increases the concentration of Na+, resulting in a low Cl−/Na+
ratios. We propose that the slope variations in the coastal regions of
Antarctica could significantly influence the sea-salt chemistry of snow. |
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