DOI: 10.1002/2013JD021234
论文题名: Nitrate postdeposition processes in Svalbard surface snow
作者: Björkman M.P. ; Vega C.P. ; Kühnel R. ; Spataro F. ; Ianniello A. ; Esposito G. ; Kaiser J. ; Marca A. ; Hodson A. ; Isaksson E. ; Roberts T.J.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 2169897X
出版年: 2014
卷: 119, 期: 22 起始页码: 12953
结束页码: 12976
语种: 英语
英文关键词: BrO chemistry
; nitrate
; photolysis
; postdeposition
; snow chemistry
; Svalbard
Scopus关键词: air mass
; atmospheric chemistry
; atmospheric transport
; boundary layer
; dry deposition
; isotopic composition
; nitrate
; snowpack
; Arctic
; Svalbard
; Svalbard and Jan Mayen
英文摘要: 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. ©2014. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63017
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Norwegian Polar Institute, Tromsø, Norway; Department of Geosciences, University of Oslo, Oslo, Norway; Department of Earth Sciences, University of Gothenburg, Göteborg, Sweden; Department of Earth Sciences, Uppsala University, Uppsala, Sweden; C.N.R.-Istituto sull'Inquinamento Atmosferico, I-Roma, Italy; School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom; Department of Geography, University of Sheffield, Sheffield, United Kingdom; LPC2E, UMR 7328, CNRS-Université d'Orléans, Orléans, France
Recommended Citation:
Björkman M.P.,Vega C.P.,Kühnel R.,et al. Nitrate postdeposition processes in Svalbard surface snow[J]. Journal of Geophysical Research Atmospheres,2014-01-01,119(22)