uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Nitrate post-depositional processes in Svalbard surface snow
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Show others and affiliations
2014 (English)In: Journal of Geophysical Research - Atmospheres, ISSN 2169-897X, E-ISSN 2169-8996, Vol. 119, no 22, 12953-12976 p.Article in journal (Refereed) Published
Abstract [en]

The snowpack acts as a sink for atmospheric reactive nitrogen, but several postdeposition pathways have been reported to alter the concentration and isotopic composition of snow nitrate with implications for atmospheric boundary layer chemistry, ice core records, and terrestrial ecology following snow melt. Careful daily sampling of surface snow during winter (11–15 February 2010) and springtime (9 April to 5 May 2010) near Ny-Ålesund, Svalbard reveals a complex pattern of processes within the snowpack. Dry deposition was found to dominate over postdeposition losses, with a net nitrate deposition rate of (0.6 ± 0.2) µmol m−2 d−1 to homogeneous surface snow. At Ny-Ålesund, such surface dry deposition can either solely result from long-range atmospheric transport of oxidized nitrogen or include the redeposition of photolytic/bacterial emission originating from deeper snow layers. Our data further confirm that polar basin air masses bring 15N-depleted nitrate to Svalbard, while high nitrate δ(18O) values only occur in connection with ozone-depleted air, and show that these signatures are reflected in the deposited nitrate. Such ozone-depleted air is attributed to active halogen chemistry in the air masses advected to the site. However, here the Ny-Ålesund surface snow was shown to have an active role in the halogen dynamics for this region, as indicated by declining bromide concentrations and increasing nitrate δ(18O), during high BrO (low-ozone) events. The data also indicate that the snowpack BrO-NOx cycling continued in postevent periods, when ambient ozone and BrO levels recovered.

Place, publisher, year, edition, pages
2014. Vol. 119, no 22, 12953-12976 p.
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-236327DOI: 10.1002/2013JD021234ISI: 000346345600030OAI: oai:DiVA.org:uu-236327DiVA: diva2:763958
EU, FP7, Seventh Framework Programme, 215503
Available from: 2014-11-17 Created: 2014-11-17 Last updated: 2015-01-20Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Vega, Carmen P.
By organisation
In the same journal
Journal of Geophysical Research - Atmospheres
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 417 hits
ReferencesLink to record
Permanent link

Direct link