Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Svalbard summer melting, continentality, and sea ice extent from the Lomonosovfonna ice core
Show others and affiliations
Responsible organisation
2006 (English)In: Journal of Geophysical Research - Atmospheres, ISSN 2169-897X, E-ISSN 2169-8996, Vol. 111, no D7, article id D07110Article in journal (Refereed) Published
Abstract [en]

We develop a continentality proxy (1600-1930) based on amplitudes of the annual signal in oxygen isotopes in an ice core. We show via modeling that by using 5 and 15 year average amplitudes the effects of diffusion and varying layer thickness can be minimized, such that amplitudes then reflect real seasonal changes in delta O-18 under the influence of melt. A model of chemical fractionation in ice based on differing elution rates for pairs of ions is developed as a proxy for summer melt (1130-1990). The best pairs are sodium with magnesium and potassium with chloride. The continentality and melt proxies are validated against twentieth-century instrumental records and longer historical climate proxies. In addition to summer temperature, the melt proxy also appears to reflect sea ice extent, likely as a result of sodium chloride fractionation in the oceanic sea ice margin source area that is dependent on winter temperatures. We show that the climate history they depict is consistent with what we see from isotopic paleothermometry. Continentality was greatest during the Little Ice Age but decreased around 1870, 20-30 years before the rise in temperatures indicated by the delta O-18 profile. The degree of summer melt was significantly larger during the period 1130-1300 than in the 1990s.

Place, publisher, year, edition, pages
Univ Lapland, Arctic Ctr, FIN-96101 Rovaniemi, Finland. Univ Oulu, Dept Geophys, Oulu, Finland. Uppsala Univ, Dept Earth Sci, SE-75236 Uppsala, Sweden. Tallinn Univ Technol, Inst Geol, EE-10143 Tallinn, Estonia. Norwegian Polar Res Inst, Polar Environm Ctr, N-9296 Tromso, Norway., 2006. Vol. 111, no D7, article id D07110
Research subject
SWEDARCTIC
Identifiers
URN: urn:nbn:se:polar:diva-2429DOI: 10.1029/2005JD006494ISI: 000237281700005OAI: oai:DiVA.org:polar-2429DiVA, id: diva2:883557
Available from: 2015-12-17 Created: 2015-10-07 Last updated: 2017-12-01

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full text

Search in DiVA

By author/editor
Grinsted, A
In the same journal
Journal of Geophysical Research - Atmospheres

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 60 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf