 |
| Titel |
Sea ice dynamics influence halogen deposition to Svalbard |
| VerfasserIn |
A. Spolaor, J. Gabrieli, T. Martma, J. Köhler, M. B. Björkman, E. Isaksson, C. Varin, P. Vallelonga, J. M. C. Plane, C. Barbante |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1994-0416
|
| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 7, no. 5 ; Nr. 7, no. 5 (2013-10-31), S.1645-1658 |
| Datensatznummer |
250085174
|
| Publikation (Nr.) |
 copernicus.org/tc-7-1645-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Sea ice is an important parameter in the climate system and its changes
impact upon the polar albedo and atmospheric and oceanic circulation. Iodine
(I) and bromine (Br) have been measured in a shallow firn core drilled at
the summit of the Holtedahlfonna glacier (Northwest Spitsbergen, Svalbard).
Changing I concentrations can be linked to the March–May maximum sea ice
extension. Bromine enrichment, indexed to the Br / Na sea water mass ratio,
appears to be influenced by changes in the seasonal sea ice area. I is
emitted from marine biota and so the retreat of March–May sea ice coincides
with enlargement of the open-ocean surface which enhances marine primary
production and consequent I emission. The observed Br enrichment could be
explained by greater Br emissions during the Br explosions that have been
observed to occur mainly above first year sea ice during the early
springtime. In this work we present the first comparison between halogens in
surface snow and Arctic sea ice extension. Although further investigation is
required to characterize potential depositional and post-depositional
processes, these preliminary findings suggest that I and Br can be linked to
variability in the spring maximum sea ice extension and seasonal sea ice
surface area. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|