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Article: Winter-season climatic signals in the recently deposited snowpack on a Norwegian alpine glacier

TitleWinter-season climatic signals in the recently deposited snowpack on a Norwegian alpine glacier
Authors
Issue Date2002
PublisherI W A Publishing. The Journal's web site is located at http://www.iwapublishing.com/template.cfm?name=iwapnordichydrology
Citation
Nordic Hydrology, 2002, v. 33 n. 2-3, p. 111-122 How to Cite?
AbstractVertical variations of oxygen isotopes in the snow which accumulates during the winter at the Norwegian glacier Austre Okstindbreen are not entirely eliminated after 1-2 months of ablation in the following summer. Survival of isotopic signals closely relates to the re-freezing capacity of snow accumulated in winter when its temperature was below 0°C. The meltwater re-freezes in layers formed in winter hindered subsequent meltwater percolation in summer when snow temperature was at melting point and, therefore, varied isotopic record was reserved between these ice layers. The isotopic record in snowpack can provide an estimate of the approximate trend of the most recent winter season temperatures. The relationship between regional temperature changes and δ 18O values in the snowpack is affected by many natural factors, but 1989-90 (a glacier balance year) winter air temperatures were reflected in the snow which remained on the glacier Austre Okstindbreen at an altitude of 1,350 m in July 1990. There was larger amplitude of variations of δ 18O values in the 4.1 m of snow above the 1989 summer surface, but variations in the underlying firn were relatively small. Meltwater percolation modifies the initial variations of δ 18O values in the snowpack. At a site below the mean equilibrium line altitude on Austre Okstindbreen, increased isotopic homogenization within a ten-day period in July accompanied an increase of the mean δ 18O value. Although the isotopic record at a temperate glacier is likely to be influenced by more factors than is that at polar glaciers, it can provide an estimate of the approximate trend of recent local temperature variations.
Persistent Identifierhttp://hdl.handle.net/10722/86142
ISSN
2009 Impact Factor: 0.65
2015 SCImago Journal Rankings: 1.053
References

 

DC FieldValueLanguage
dc.contributor.authorHe, Yen_HK
dc.contributor.authorTheakstone, WHen_HK
dc.contributor.authorYao, Ten_HK
dc.contributor.authorCheng, Gen_HK
dc.contributor.authorZhang, Den_HK
dc.contributor.authorYang, Men_HK
dc.date.accessioned2010-09-06T09:13:22Z-
dc.date.available2010-09-06T09:13:22Z-
dc.date.issued2002en_HK
dc.identifier.citationNordic Hydrology, 2002, v. 33 n. 2-3, p. 111-122en_HK
dc.identifier.issn0029-1277en_HK
dc.identifier.urihttp://hdl.handle.net/10722/86142-
dc.description.abstractVertical variations of oxygen isotopes in the snow which accumulates during the winter at the Norwegian glacier Austre Okstindbreen are not entirely eliminated after 1-2 months of ablation in the following summer. Survival of isotopic signals closely relates to the re-freezing capacity of snow accumulated in winter when its temperature was below 0°C. The meltwater re-freezes in layers formed in winter hindered subsequent meltwater percolation in summer when snow temperature was at melting point and, therefore, varied isotopic record was reserved between these ice layers. The isotopic record in snowpack can provide an estimate of the approximate trend of the most recent winter season temperatures. The relationship between regional temperature changes and δ 18O values in the snowpack is affected by many natural factors, but 1989-90 (a glacier balance year) winter air temperatures were reflected in the snow which remained on the glacier Austre Okstindbreen at an altitude of 1,350 m in July 1990. There was larger amplitude of variations of δ 18O values in the 4.1 m of snow above the 1989 summer surface, but variations in the underlying firn were relatively small. Meltwater percolation modifies the initial variations of δ 18O values in the snowpack. At a site below the mean equilibrium line altitude on Austre Okstindbreen, increased isotopic homogenization within a ten-day period in July accompanied an increase of the mean δ 18O value. Although the isotopic record at a temperate glacier is likely to be influenced by more factors than is that at polar glaciers, it can provide an estimate of the approximate trend of recent local temperature variations.en_HK
dc.languageengen_HK
dc.publisherI W A Publishing. The Journal's web site is located at http://www.iwapublishing.com/template.cfm?name=iwapnordichydrologyen_HK
dc.relation.ispartofNordic Hydrologyen_HK
dc.titleWinter-season climatic signals in the recently deposited snowpack on a Norwegian alpine glacieren_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0029-1277&volume=33&spage=111&epage=122&date=2002&atitle=Winter-Season+Climatic+Signals+in+the+Recently+Deposited+Snowpack+on+a+Norwegian+Alpine+Glacieren_HK
dc.identifier.emailZhang, D:zhangd@hkucc.hku.hken_HK
dc.identifier.authorityZhang, D=rp00649en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0036071665en_HK
dc.identifier.hkuros71527en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036071665&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume33en_HK
dc.identifier.issue2-3en_HK
dc.identifier.spage111en_HK
dc.identifier.epage122en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridHe, Y=7404942217en_HK
dc.identifier.scopusauthoridTheakstone, WH=7003836274en_HK
dc.identifier.scopusauthoridYao, T=7401886289en_HK
dc.identifier.scopusauthoridCheng, G=7401862683en_HK
dc.identifier.scopusauthoridZhang, D=9732911600en_HK
dc.identifier.scopusauthoridYang, M=7404925844en_HK

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